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":"42 1","pages":"368 - 376"},"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":"42 1","pages":"335 - 347"},"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":"42 1","pages":"377 - 387"},"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":"42 1","pages":"359 - 367"},"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":"42 1","pages":"327 - 334"},"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}
Pub Date : 2022-05-19DOI: 10.1080/02726343.2022.2110018
Hemant Patidar, R. Kar
ABSTRACT This work uses the active and parasitic components in a linear antenna array composed of parallel dipoles to synthesize a cosecant squared pattern using the Quantum Particle Swarm Optimization approach. This pattern is obtained by the mechanical displacement of the parasitic array of the parallel dipole placed in front of an active dipole array. In addition to it, mutual coupling between the antenna elements is considered in this process. Two examples are presented to visualize the effect of this approach in the synthesis process. Moreover, obtained results from the simulation are also validated by the results produced from FEKO software.
{"title":"Generation of cosecant squared pattern from linear array of active and parasitic dipole antennas","authors":"Hemant Patidar, R. Kar","doi":"10.1080/02726343.2022.2110018","DOIUrl":"https://doi.org/10.1080/02726343.2022.2110018","url":null,"abstract":"ABSTRACT This work uses the active and parasitic components in a linear antenna array composed of parallel dipoles to synthesize a cosecant squared pattern using the Quantum Particle Swarm Optimization approach. This pattern is obtained by the mechanical displacement of the parasitic array of the parallel dipole placed in front of an active dipole array. In addition to it, mutual coupling between the antenna elements is considered in this process. Two examples are presented to visualize the effect of this approach in the synthesis process. Moreover, obtained results from the simulation are also validated by the results produced from FEKO software.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":"42 1","pages":"278 - 294"},"PeriodicalIF":0.8,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47473036","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 : 2022-05-19DOI: 10.1080/02726343.2022.2099341
A. Deshmukh, Venkata A. P. Chavali, A. Ambekar
ABSTRACT Wideband designs of a coaxially fed pair of slot cut square, circular, and equilateral triangular microstrip antennas employing the H-shaped or Bow-tie shaped ground plane profile are presented on an electrically thinner substrate (ht ~ 0.04λg). The modified ground plane yields an optimum impedance matching for the response inside VSWR = 2 circle that gives a wider bandwidth. Among all the slot cut regular shaped microstrip antennas, an optimum response in terms of the bandwidth and gain against the substrate thickness reduction is achieved in E-shaped square microstrip antennas backed by the Bow-tie shaped ground plane. Against the thicker substrate design (ht ~ 0.07λg), it yields bandwidth increment by > 10% and reduction in the substrate thickness by 0.03λg, with a peak broadside gain of 6.2 dBi. An experimental validation is carried out in all the proposed configurations that show close matching with the simulations.
{"title":"Thinner Substrate Designs of Modified Ground Plane E–shape Microstrip Antennas for Wideband Response","authors":"A. Deshmukh, Venkata A. P. Chavali, A. Ambekar","doi":"10.1080/02726343.2022.2099341","DOIUrl":"https://doi.org/10.1080/02726343.2022.2099341","url":null,"abstract":"ABSTRACT Wideband designs of a coaxially fed pair of slot cut square, circular, and equilateral triangular microstrip antennas employing the H-shaped or Bow-tie shaped ground plane profile are presented on an electrically thinner substrate (ht ~ 0.04λg). The modified ground plane yields an optimum impedance matching for the response inside VSWR = 2 circle that gives a wider bandwidth. Among all the slot cut regular shaped microstrip antennas, an optimum response in terms of the bandwidth and gain against the substrate thickness reduction is achieved in E-shaped square microstrip antennas backed by the Bow-tie shaped ground plane. Against the thicker substrate design (ht ~ 0.07λg), it yields bandwidth increment by > 10% and reduction in the substrate thickness by 0.03λg, with a peak broadside gain of 6.2 dBi. An experimental validation is carried out in all the proposed configurations that show close matching with the simulations.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":"42 1","pages":"255 - 265"},"PeriodicalIF":0.8,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45408771","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}
ABSTRACT article shows a splicable dual-pol. ultra-wideband array antenna used in large-scale arrays. An unequal-spaced metal bullet structure is used as the basic antenna element, and the gradual slot for radiation is spliced by the metal bullet radiator. The bullet structure is directly and vertically interconnected through elastic RF connectors. The antenna structure can be independently installed on the metal backplane and positioned through the slots on the metal backplane to ensure good electrical performance. Compared with the antenna structure processed by PCB technology, this type of antenna can effectively avoid the generation of surface wave modes, thereby ensuring that there is no VSWR singularity in the broadband. The proposed antenna array can realize ±45°scanning in azimuth plane and ±35°scanning in elevation plane within four octave bands. Based on the proposed antenna, a 10*10 prototype was tested. The measured results were consistent with the simulation results.
{"title":"Unequally Spaced Scalable dual-polarized Ultra-wideband Antenna Array with Slot Positioning for Large Scale Array","authors":"Yuanjiang Zhu, Xiangxiang Li, Jing Tao, Weixiang Jiang","doi":"10.1080/02726343.2022.2110015","DOIUrl":"https://doi.org/10.1080/02726343.2022.2110015","url":null,"abstract":"ABSTRACT article shows a splicable dual-pol. ultra-wideband array antenna used in large-scale arrays. An unequal-spaced metal bullet structure is used as the basic antenna element, and the gradual slot for radiation is spliced by the metal bullet radiator. The bullet structure is directly and vertically interconnected through elastic RF connectors. The antenna structure can be independently installed on the metal backplane and positioned through the slots on the metal backplane to ensure good electrical performance. Compared with the antenna structure processed by PCB technology, this type of antenna can effectively avoid the generation of surface wave modes, thereby ensuring that there is no VSWR singularity in the broadband. The proposed antenna array can realize ±45°scanning in azimuth plane and ±35°scanning in elevation plane within four octave bands. Based on the proposed antenna, a 10*10 prototype was tested. The measured results were consistent with the simulation results.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":"42 1","pages":"309 - 326"},"PeriodicalIF":0.8,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42218705","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 : 2022-05-19DOI: 10.1080/02726343.2022.2110028
Hichem Boubakar, M. Abri, M. Benaissa, Sarosh Ahmad, A. Ghaffar
ABSTRACT This paper addresses the growing need for multifunctioning microwave components by proposing a miniaturized reconfigurable stopband filter. The compact size is the outcome of the novel metamaterial split-ring resonator used for realizing this filter. Six PIN diodes are used to achieve real-time frequency and mode reconfigurability. This filter is designed to reject three important frequencies in wireless communication systems: 1.9, 2.4, and 3.6 GHz. Moreover, depending on the use, it is possible to reject one, two, or all the three frequencies, which resulted in seven different cases with three possible modes: single, dual, or triple stopbands. A prototype was manufactured for this filter, and strong agreement between simulation and measurement results is observed. Due to its target bands, this reconfigurable stopband filter is suitable for various cellular communication technologies from 3 G and 4 G up to 5 G and many other S-band applications.
{"title":"Design and realization of frequency and mode electronically reconfigurable metamaterial stopband filter for wireless communication systems","authors":"Hichem Boubakar, M. Abri, M. Benaissa, Sarosh Ahmad, A. Ghaffar","doi":"10.1080/02726343.2022.2110028","DOIUrl":"https://doi.org/10.1080/02726343.2022.2110028","url":null,"abstract":"ABSTRACT This paper addresses the growing need for multifunctioning microwave components by proposing a miniaturized reconfigurable stopband filter. The compact size is the outcome of the novel metamaterial split-ring resonator used for realizing this filter. Six PIN diodes are used to achieve real-time frequency and mode reconfigurability. This filter is designed to reject three important frequencies in wireless communication systems: 1.9, 2.4, and 3.6 GHz. Moreover, depending on the use, it is possible to reject one, two, or all the three frequencies, which resulted in seven different cases with three possible modes: single, dual, or triple stopbands. A prototype was manufactured for this filter, and strong agreement between simulation and measurement results is observed. Due to its target bands, this reconfigurable stopband filter is suitable for various cellular communication technologies from 3 G and 4 G up to 5 G and many other S-band applications.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":"42 1","pages":"266 - 277"},"PeriodicalIF":0.8,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46730486","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 : 2022-05-19DOI: 10.1080/02726343.2022.2099361
R. Ou, Wei-Lun Yu
ABSTRACT A broadband circularly polarized antenna for implantable and ingested wireless biomedical devices is designed, by loading the compact double semicircular resonant ring. The high electromagnetic energy is collected to generate and enhance the circular polarization characteristics of the antenna, the impedance bandwidth, and axial ratio bandwidth are improved while the volume is reduced. The size of the antenna is reduced to π×(5)2 × 0.635 mm3 with the same bandwidth requirement by introducing T-shaped capacitive loading branch. The performance of the antennas implanted in different human tissues is compared, and the biological compatibility, radiation characteristics, and safety of the antenna are analyzed. In the simulated skin model, the simulation impedance bandwidth is 24.1%, and the axial ratio bandwidth is 18.4%. Finally, the antenna is fabricated and tested in pork. The impedance bandwidth is 23.8%, and the axial ratio bandwidth is 18.6%. The communication ability is evaluated through the external antenna, and the effective transmission distance is 5.5 m. The designed antenna has a simple structure, strong compatibility, and wide functional bandwidth, which can meet the needs of implantable and ingested biomedical devices in the ISM frequency band.
{"title":"Design of broadband circularly polarized antenna for implantable and ingested biomedical devices","authors":"R. Ou, Wei-Lun Yu","doi":"10.1080/02726343.2022.2099361","DOIUrl":"https://doi.org/10.1080/02726343.2022.2099361","url":null,"abstract":"ABSTRACT A broadband circularly polarized antenna for implantable and ingested wireless biomedical devices is designed, by loading the compact double semicircular resonant ring. The high electromagnetic energy is collected to generate and enhance the circular polarization characteristics of the antenna, the impedance bandwidth, and axial ratio bandwidth are improved while the volume is reduced. The size of the antenna is reduced to π×(5)2 × 0.635 mm3 with the same bandwidth requirement by introducing T-shaped capacitive loading branch. The performance of the antennas implanted in different human tissues is compared, and the biological compatibility, radiation characteristics, and safety of the antenna are analyzed. In the simulated skin model, the simulation impedance bandwidth is 24.1%, and the axial ratio bandwidth is 18.4%. Finally, the antenna is fabricated and tested in pork. The impedance bandwidth is 23.8%, and the axial ratio bandwidth is 18.6%. The communication ability is evaluated through the external antenna, and the effective transmission distance is 5.5 m. The designed antenna has a simple structure, strong compatibility, and wide functional bandwidth, which can meet the needs of implantable and ingested biomedical devices in the ISM frequency band.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":"42 1","pages":"295 - 308"},"PeriodicalIF":0.8,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45718375","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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