Pub Date : 2022-08-18DOI: 10.1080/02726343.2022.2147667
Min Wang, Yuxin Mo, Xuan Li, Nan Hu, Wenqing Xie, Zhengchuan Chen
ABSTRACT A hybrid phase error analysis for dual-polarized reflectarray antenna using asymmetric split patch element is proposed in this article. The asymmetric split patch consists of a four-leaf patch and two split rings of different size where small one makes the patch asymmeric along y-axis and large one is used for impedance matching. And a complete 360° phase shift is obtained by using variable-size approach and flipping split patch 180° along y-axis. Then, we use hybrid phase error analysis approach to analyze and optimize the influence of phase sensitivity, quasi-periodic influence and phase constant on the reflectarray antenna. The simulated results show that maximum of element phase sensitivity is reduced by 275°/mm and element quasi-periodic phase error is dropped by 38°. Furthermore, dual-polarized reflectarray composed of 676 asymmetric split patch elements is designed, fabricated and measured. The measured gain of the proposed antenna is 29.9 dBi @10.0 GHz with aperture efficiency of 46%. The −1 dB gain bandwidth is 12% @10.0 GHz. The measured results show that the proposed antenna can improve phase accuracy effectively by using hybrid phase error analysis approach with asymmetric split patch.
{"title":"Hybrid phase error analysis for dual-polarized reflectarray antenna using asymmetric split patch element","authors":"Min Wang, Yuxin Mo, Xuan Li, Nan Hu, Wenqing Xie, Zhengchuan Chen","doi":"10.1080/02726343.2022.2147667","DOIUrl":"https://doi.org/10.1080/02726343.2022.2147667","url":null,"abstract":"ABSTRACT A hybrid phase error analysis for dual-polarized reflectarray antenna using asymmetric split patch element is proposed in this article. The asymmetric split patch consists of a four-leaf patch and two split rings of different size where small one makes the patch asymmeric along y-axis and large one is used for impedance matching. And a complete 360° phase shift is obtained by using variable-size approach and flipping split patch 180° along y-axis. Then, we use hybrid phase error analysis approach to analyze and optimize the influence of phase sensitivity, quasi-periodic influence and phase constant on the reflectarray antenna. The simulated results show that maximum of element phase sensitivity is reduced by 275°/mm and element quasi-periodic phase error is dropped by 38°. Furthermore, dual-polarized reflectarray composed of 676 asymmetric split patch elements is designed, fabricated and measured. The measured gain of the proposed antenna is 29.9 dBi @10.0 GHz with aperture efficiency of 46%. The −1 dB gain bandwidth is 12% @10.0 GHz. The measured results show that the proposed antenna can improve phase accuracy effectively by using hybrid phase error analysis approach with asymmetric split patch.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48720181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-18DOI: 10.1080/02726343.2022.2144062
B. Lin, Wenzhun Huang, Jianxin Guo, Yan-wen Wang, Hongjun Ye, Xiang Ji
ABSTRACT In this work, a high-efficiency ultra-wideband ellipse-shaped linear-to-circular polarization conversion metasurface is proposed. The metasurface is composed of a square array of ellipse-shaped metal patches printed on grounded dielectric substrate and covered by a dielectric layer, because it is an orthogonal anisotropic structure with a pair of mutually perpendicular symmetric axes u and v along the directions ±45° with respect to the vertical y-axis, and the reflection phase difference under u- and v-polarized incidences is very close to −90° in an ultra-wide frequency ranges, both theoretical prediction and numerical simulation show that the metasurface can achieve high-efficiency ultra-wideband linear-to-circular polarization conversion under x- and y-polarized incidences, its 3-dB axial-ratio (AR) band is between 7.08 and 25.86 GHz with a relative bandwidth of 114%, in particular, the AR of its reflected wave can be kept lower than 0.89 dB in the frequency range 7.65–25.32 GHz, in which the polarization conversion rate (PCR) is always larger than 99.73%. Finally, one effective experimental verification is carried out, and a reasonable agreement is observed between the simulation and experimental results. Therefore, the polarization conversion metasurface has great potential application values in various polarization-controlled devices.
{"title":"An ultra-wideband ellipse-shaped linear-to-circular polarization conversion metasurface with high efficiency","authors":"B. Lin, Wenzhun Huang, Jianxin Guo, Yan-wen Wang, Hongjun Ye, Xiang Ji","doi":"10.1080/02726343.2022.2144062","DOIUrl":"https://doi.org/10.1080/02726343.2022.2144062","url":null,"abstract":"ABSTRACT In this work, a high-efficiency ultra-wideband ellipse-shaped linear-to-circular polarization conversion metasurface is proposed. The metasurface is composed of a square array of ellipse-shaped metal patches printed on grounded dielectric substrate and covered by a dielectric layer, because it is an orthogonal anisotropic structure with a pair of mutually perpendicular symmetric axes u and v along the directions ±45° with respect to the vertical y-axis, and the reflection phase difference under u- and v-polarized incidences is very close to −90° in an ultra-wide frequency ranges, both theoretical prediction and numerical simulation show that the metasurface can achieve high-efficiency ultra-wideband linear-to-circular polarization conversion under x- and y-polarized incidences, its 3-dB axial-ratio (AR) band is between 7.08 and 25.86 GHz with a relative bandwidth of 114%, in particular, the AR of its reflected wave can be kept lower than 0.89 dB in the frequency range 7.65–25.32 GHz, in which the polarization conversion rate (PCR) is always larger than 99.73%. Finally, one effective experimental verification is carried out, and a reasonable agreement is observed between the simulation and experimental results. Therefore, the polarization conversion metasurface has great potential application values in various polarization-controlled devices.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49107574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-18DOI: 10.1080/02726343.2022.2140922
Weihua Luo, Yulu Feng, Yi Ren, Min Wang
ABSTRACT For integrated design of a filter and an antenna, a wideband circularly polarized (CP) dielectric resonator antenna (DRA) with filtering characteristics is proposed. A rectangular slot structure is etched on the ground to optimize the axial ratio (AR) bandwidth of the antenna singly fed by one port. Capacitive filtering branches are combined into the microstrip feeding line to effectively generate two radiation nulls outside the passband. To further enhance the suppression level in the high-frequency stopband, the stair-shaped DR is chamfered into a fish-shaped structure. A suppression level larger than 15 dB is found within the stopband. A prototype of the antenna is fabricated, and both of the simulated and measured results show a wide bandpass filtering performance over the operating frequency band. The antenna has an impedance bandwidth of 37.8%, an AR bandwidth of 25.1%, and a low profile of 0.078λ 0 (λ 0 is the free-space wavelength at 5.47 GHz), which can be a good candidate for 5 G and WLAN communication systems.
{"title":"A Wideband Single-fed circularly polarized dielectric resonator antenna with bandpass filtering response","authors":"Weihua Luo, Yulu Feng, Yi Ren, Min Wang","doi":"10.1080/02726343.2022.2140922","DOIUrl":"https://doi.org/10.1080/02726343.2022.2140922","url":null,"abstract":"ABSTRACT For integrated design of a filter and an antenna, a wideband circularly polarized (CP) dielectric resonator antenna (DRA) with filtering characteristics is proposed. A rectangular slot structure is etched on the ground to optimize the axial ratio (AR) bandwidth of the antenna singly fed by one port. Capacitive filtering branches are combined into the microstrip feeding line to effectively generate two radiation nulls outside the passband. To further enhance the suppression level in the high-frequency stopband, the stair-shaped DR is chamfered into a fish-shaped structure. A suppression level larger than 15 dB is found within the stopband. A prototype of the antenna is fabricated, and both of the simulated and measured results show a wide bandpass filtering performance over the operating frequency band. The antenna has an impedance bandwidth of 37.8%, an AR bandwidth of 25.1%, and a low profile of 0.078λ 0 (λ 0 is the free-space wavelength at 5.47 GHz), which can be a good candidate for 5 G and WLAN communication systems.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44554438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-18DOI: 10.1080/02726343.2022.2140925
Rahul Tiwari, A. Bagwari, V. Kushwah
ABSTRACT This article demonstrated a compact reconfigurable microstrip antenna with a multi-band configuration. It resonates for three different frequency configurations, including the single and dual bands. The primary rectangular patch antenna resonates for WLAN (5.2 GHz center frequency) band. The reconfigurable electromagnetic bandgap (EBG) and parasitic patches near the feed line produce 4 and 6.33 GHz resonance. The defected ground structure is integrated with a PIN diode to make reconfigurable EBG, and it resonated at C band (4 GHz). The PIN diode switching configuration embedded with EBG and one square patch creates dual-band characteristics in wireless local-area network (WLAN) and International Telecommunication Union (ITU) bands. Other PIN diodes switching configurations with primary antenna and two other patches work for C and WLAN bands. The proposed antenna resonated at 4, 5.2, and 6.33 GHz frequencies with different switching configurations of the PIN diode. The simulated results of this novel antenna configuration verified with measured consequences for antenna parameters like reflection coefficient and radiation characteristics are also presented.
{"title":"Multi-band frequency reconfigurable antenna using EBG and parasitic patches","authors":"Rahul Tiwari, A. Bagwari, V. Kushwah","doi":"10.1080/02726343.2022.2140925","DOIUrl":"https://doi.org/10.1080/02726343.2022.2140925","url":null,"abstract":"ABSTRACT This article demonstrated a compact reconfigurable microstrip antenna with a multi-band configuration. It resonates for three different frequency configurations, including the single and dual bands. The primary rectangular patch antenna resonates for WLAN (5.2 GHz center frequency) band. The reconfigurable electromagnetic bandgap (EBG) and parasitic patches near the feed line produce 4 and 6.33 GHz resonance. The defected ground structure is integrated with a PIN diode to make reconfigurable EBG, and it resonated at C band (4 GHz). The PIN diode switching configuration embedded with EBG and one square patch creates dual-band characteristics in wireless local-area network (WLAN) and International Telecommunication Union (ITU) bands. Other PIN diodes switching configurations with primary antenna and two other patches work for C and WLAN bands. The proposed antenna resonated at 4, 5.2, and 6.33 GHz frequencies with different switching configurations of the PIN diode. The simulated results of this novel antenna configuration verified with measured consequences for antenna parameters like reflection coefficient and radiation characteristics are also presented.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45493919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-04DOI: 10.1080/02726343.2022.2118428
G. Sen, Aditi Sharma, Saptarshi Ghosh, Santanu Das
ABSTRACT In this letter, a dual-polarized dual-transmission frequency selective rasorber (FSR) geometry is demonstrated. The top layer of the FSR is built of a cross-dipole design loaded with chip resistors for obtaining a wideband absorption. In addition, two different split ring resonator patterns are printed at each side of the substrate connected by metallized vias to achieve two in-band transmission responses. The bottom layer is designed from a slot geometry to exhibit two transmission bands similar to that of the top layer. The overall FSR structure exhibits a −10 dB reflection response ranging from 2.0 GHz to 8.15 GHz (having a fractional bandwidth of 121%), with transmission peaks appearing at 4.2 GHz and 6.2 GHz having insertion losses of 2.3 dB and 2.9 dB, respectively. The unit cell topology is miniaturized with dimensions of 0.1λL×0.1λL, λL being the free space wavelength at the lowest operating frequency. The proposed FSR also satisfies polarization-insensitive characteristic and angular stability behavior for differentmodes. The working principle behind such wideband absorption and in-band transmission phenomena are analyzed and an equivalent circuit model is presented. A prototype of the proposed FSR is manufactured and measured, confirming the simulated responses.
{"title":"A wide inter-absorption dual-transmission dual-polarized frequency selective rasorber based on SRRs","authors":"G. Sen, Aditi Sharma, Saptarshi Ghosh, Santanu Das","doi":"10.1080/02726343.2022.2118428","DOIUrl":"https://doi.org/10.1080/02726343.2022.2118428","url":null,"abstract":"ABSTRACT In this letter, a dual-polarized dual-transmission frequency selective rasorber (FSR) geometry is demonstrated. The top layer of the FSR is built of a cross-dipole design loaded with chip resistors for obtaining a wideband absorption. In addition, two different split ring resonator patterns are printed at each side of the substrate connected by metallized vias to achieve two in-band transmission responses. The bottom layer is designed from a slot geometry to exhibit two transmission bands similar to that of the top layer. The overall FSR structure exhibits a −10 dB reflection response ranging from 2.0 GHz to 8.15 GHz (having a fractional bandwidth of 121%), with transmission peaks appearing at 4.2 GHz and 6.2 GHz having insertion losses of 2.3 dB and 2.9 dB, respectively. The unit cell topology is miniaturized with dimensions of 0.1λL×0.1λL, λL being the free space wavelength at the lowest operating frequency. The proposed FSR also satisfies polarization-insensitive characteristic and angular stability behavior for differentmodes. The working principle behind such wideband absorption and in-band transmission phenomena are analyzed and an equivalent circuit model is presented. A prototype of the proposed FSR is manufactured and measured, confirming the simulated responses.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45754973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-04DOI: 10.1080/02726343.2022.2118421
Lei Wang, Jingxin Chen, Rui Zhang, Liye Cheng
ABSTRACT A new broadband circularly polarized (CP) microstrip slot antenna (MSA) is proposed in this study. The proposed CP MSA is comprised of a square-loop feed configuration, four rectangular patches as parasitic patches, and a square ground plane etched with four L-shaped slots as parasitic slots. The square-loop feed configuration, which can stimulate a 270° phase difference, comprises an arc-shaped strip and a square-loop. Rectangular patches and L-shaped slots as parasitic elements are together arranged and etched at the side of the square-loop feed configuration to excite multiple CP resonant modes using a capacitively coupled feeding technology. A prototype of the proposed antenna was simulated, manufactured, and measured in this study. The measured results depict that the CP MSA features a wide impedance bandwidth of 4.36–5.36 GHz (20.6%) for|S11| < −10 dB and broad axial ratio bandwidth (ARBW) of 4.53–5.30 GHz (15.7%) for AR < 3 dB. Thus, the proposed CP MSA would be an outstanding candidate in wireless communication systems.
{"title":"A compact broadband microstrip slot circularly polarized antenna using parasitic elements","authors":"Lei Wang, Jingxin Chen, Rui Zhang, Liye Cheng","doi":"10.1080/02726343.2022.2118421","DOIUrl":"https://doi.org/10.1080/02726343.2022.2118421","url":null,"abstract":"ABSTRACT A new broadband circularly polarized (CP) microstrip slot antenna (MSA) is proposed in this study. The proposed CP MSA is comprised of a square-loop feed configuration, four rectangular patches as parasitic patches, and a square ground plane etched with four L-shaped slots as parasitic slots. The square-loop feed configuration, which can stimulate a 270° phase difference, comprises an arc-shaped strip and a square-loop. Rectangular patches and L-shaped slots as parasitic elements are together arranged and etched at the side of the square-loop feed configuration to excite multiple CP resonant modes using a capacitively coupled feeding technology. A prototype of the proposed antenna was simulated, manufactured, and measured in this study. The measured results depict that the CP MSA features a wide impedance bandwidth of 4.36–5.36 GHz (20.6%) for|S11| < −10 dB and broad axial ratio bandwidth (ARBW) of 4.53–5.30 GHz (15.7%) for AR < 3 dB. Thus, the proposed CP MSA would be an outstanding candidate in wireless communication systems.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45887945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-04DOI: 10.1080/02726343.2022.2116838
T. Doan, Khac Kiem Nguyen, S. Ta
ABSTRACT This paper describes a dual circularly polarized (CP) antenna with high isolation and its 2 × 2 element array for the X-band synthetic aperture radars. The antenna is an aperture-coupled metasurface of 4 × 4 periodic corner-truncated patches, which is fed by two orthogonal microstrip-lines to generate the dual-CP radiation. A novel asymmetric fence-shaped slot is utilized as the coupled aperture of the antenna to enhance the port-to-port isolation. To achieve a more robust dual-CP radiation, the 2 × 2 element array of the aperture-coupled metasurface antenna is designed, fabricated, and tested. Both simulation and measurement indicate that the array prototype achieves an excellent dual-CP radiation at 9.6 GHz, i.e., isolation of ≥ 30 dB, axial ratio ≤ 1-dB, radiation efficiency ≥ 80%, realized gain of 14.0 dBic, and cross-polarized level ≤ −20 dB at the broadside.
{"title":"Dual circularly polarized aperture-coupled metasurface antennas with high-isolation for X-band synthetic aperture radars","authors":"T. Doan, Khac Kiem Nguyen, S. Ta","doi":"10.1080/02726343.2022.2116838","DOIUrl":"https://doi.org/10.1080/02726343.2022.2116838","url":null,"abstract":"ABSTRACT This paper describes a dual circularly polarized (CP) antenna with high isolation and its 2 × 2 element array for the X-band synthetic aperture radars. The antenna is an aperture-coupled metasurface of 4 × 4 periodic corner-truncated patches, which is fed by two orthogonal microstrip-lines to generate the dual-CP radiation. A novel asymmetric fence-shaped slot is utilized as the coupled aperture of the antenna to enhance the port-to-port isolation. To achieve a more robust dual-CP radiation, the 2 × 2 element array of the aperture-coupled metasurface antenna is designed, fabricated, and tested. Both simulation and measurement indicate that the array prototype achieves an excellent dual-CP radiation at 9.6 GHz, i.e., isolation of ≥ 30 dB, axial ratio ≤ 1-dB, radiation efficiency ≥ 80%, realized gain of 14.0 dBic, and cross-polarized level ≤ −20 dB at the broadside.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46796759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-04DOI: 10.1080/02726343.2022.2118422
Samireh Alizadeh, S. Roshani, S. Roshani
ABSTRACT In microstrip branch line coupler (BLC) design, there are significant parameters, including size reduction, insertion loss, and harmonic suppression, which affect the performances of the device. In this paper, a modified BLC with compact size, wide harmonics suppression band, and low insertion loss in operating band is designed. In the proposed design, four types of resonators are used together to create proposed BLC with superior performance. The proposed BLC works at 900 MHz with only 0.1 dB insertion loss at pass band. The proposed BLC provides wide harmonics rejection band from 1.8 to 8.1 GHz, which suppresses 2nd to 9th unwanted harmonics. The conventional coupler occupies 0.25 λ × 0.25 λ, which has undesirable size. But, the proposed BLC occupies compact area of only 21.95 mm × 30.55 mm (0.12 λ × 0.09 λ), which shows more than 81% size reduction.
{"title":"A modified branch line coupler with compact size and ultra wide harmonics suppression band","authors":"Samireh Alizadeh, S. Roshani, S. Roshani","doi":"10.1080/02726343.2022.2118422","DOIUrl":"https://doi.org/10.1080/02726343.2022.2118422","url":null,"abstract":"ABSTRACT In microstrip branch line coupler (BLC) design, there are significant parameters, including size reduction, insertion loss, and harmonic suppression, which affect the performances of the device. In this paper, a modified BLC with compact size, wide harmonics suppression band, and low insertion loss in operating band is designed. In the proposed design, four types of resonators are used together to create proposed BLC with superior performance. The proposed BLC works at 900 MHz with only 0.1 dB insertion loss at pass band. The proposed BLC provides wide harmonics rejection band from 1.8 to 8.1 GHz, which suppresses 2nd to 9th unwanted harmonics. The conventional coupler occupies 0.25 λ × 0.25 λ, which has undesirable size. But, the proposed BLC occupies compact area of only 21.95 mm × 30.55 mm (0.12 λ × 0.09 λ), which shows more than 81% size reduction.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45202911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-04DOI: 10.1080/02726343.2022.2118429
Huan Zou, Haiyang Wang, Jingyi Wu, Rui Xiong, Xiaoqin Liu
ABSTRACT A design method of greatly widening the stopband of waveguide bandpass filter is proposed in this paper. The parasitic passband of the filter mainly comes from the high-order oscillation mode of the resonant unit. Based on the theory of capacitance loading shortening of the transmission line and the transmission characteristics of each mode in the resonant cavity, a pair of transverse one-dimensional uniform capacitive diaphragms are placed in the center of the resonant cavity to shorten the resonant cavity and suppress the high-order modes. By changing the width of the waveguide and the height of the waveguide on the distribution of out-of-band transmission poles, the out-of-band transmission poles of each resonator can be staggered, which destroys or weakens the high-order oscillation coupling transmission conditions between the resonant units of the filter and further expands the stopband width of the filter. The results show that the length of the X-band waveguide bandpass filter (center frequency 9.5 GHz, bandwidth 400 MHz) is reduced by 54%, and the 40 dB stopband rejection bandwidth is 5.7 times the cutoff frequency of the transmission waveguide, compared with the prototype half-wavelength direct-coupled filter of the conventional Chebyshev filter.
{"title":"Ultra-wide stopband waveguide bandpass filter based on out-of-band staggered tuning coupling technology","authors":"Huan Zou, Haiyang Wang, Jingyi Wu, Rui Xiong, Xiaoqin Liu","doi":"10.1080/02726343.2022.2118429","DOIUrl":"https://doi.org/10.1080/02726343.2022.2118429","url":null,"abstract":"ABSTRACT A design method of greatly widening the stopband of waveguide bandpass filter is proposed in this paper. The parasitic passband of the filter mainly comes from the high-order oscillation mode of the resonant unit. Based on the theory of capacitance loading shortening of the transmission line and the transmission characteristics of each mode in the resonant cavity, a pair of transverse one-dimensional uniform capacitive diaphragms are placed in the center of the resonant cavity to shorten the resonant cavity and suppress the high-order modes. By changing the width of the waveguide and the height of the waveguide on the distribution of out-of-band transmission poles, the out-of-band transmission poles of each resonator can be staggered, which destroys or weakens the high-order oscillation coupling transmission conditions between the resonant units of the filter and further expands the stopband width of the filter. The results show that the length of the X-band waveguide bandpass filter (center frequency 9.5 GHz, bandwidth 400 MHz) is reduced by 54%, and the 40 dB stopband rejection bandwidth is 5.7 times the cutoff frequency of the transmission waveguide, compared with the prototype half-wavelength direct-coupled filter of the conventional Chebyshev filter.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48411025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-04DOI: 10.1080/02726343.2022.2116837
Qian Kewei, Xiang Chen
ABSTRACT This paper proposes a transmission zero prediction method for LTCC filters to shorten the design period. In order to reduce the influence of parasitic coupling between elements, we use the flexibility of 3D model design to place the elements in three areas that are far apart in the vertical direction of the substrate, and control the position of the transmission zeros to achieve high out-of-band suppression. The overall size of the diplexer is 1.6 mm×0.8 mm×0.6 mm. Simulation result shows that the insertion loss of the low band is less than 0.4 dB, and the isolation of which is greater than 40 dB. The insertion loss of the high band is less than 0.83 dB, and the isolation of which is greater than 38 dB. Compared with the existing LTCC diplexer reports, our design has the advantages of compact structure, high isolation, low insertion loss and high out-of-band suppression.
{"title":"Design and implementation of a miniaturized LTCC diplexer based on lumped elements","authors":"Qian Kewei, Xiang Chen","doi":"10.1080/02726343.2022.2116837","DOIUrl":"https://doi.org/10.1080/02726343.2022.2116837","url":null,"abstract":"ABSTRACT This paper proposes a transmission zero prediction method for LTCC filters to shorten the design period. In order to reduce the influence of parasitic coupling between elements, we use the flexibility of 3D model design to place the elements in three areas that are far apart in the vertical direction of the substrate, and control the position of the transmission zeros to achieve high out-of-band suppression. The overall size of the diplexer is 1.6 mm×0.8 mm×0.6 mm. Simulation result shows that the insertion loss of the low band is less than 0.4 dB, and the isolation of which is greater than 40 dB. The insertion loss of the high band is less than 0.83 dB, and the isolation of which is greater than 38 dB. Compared with the existing LTCC diplexer reports, our design has the advantages of compact structure, high isolation, low insertion loss and high out-of-band suppression.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47807465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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