Pub Date : 2022-11-17DOI: 10.1080/02726343.2022.2161706
Narek Grigoor-Feghi, R. Masoumi, R. Kazemi
ABSTRACT In this paper, a compact cavity-backed logarithmic spiral antenna with an integrated broadband planar balun is presented. This fully planar antenna is used for detection of anti-personnel (AP) landmines in GPR systems. Unlike conventional spiral antennas, which are fed by unbalanced coaxial cable or vertical baluns, and these feed lines make them bulky and frail, in this design, a microstrip-to-parallel strip balun is integrated with the spiral antenna and makes the whole structure compact, planar, and robust. Moreover, a metal cavity is utilized at the back of the antenna to prevent backward radiation and enhance the forward penetration depth to the ground. In choosing the operational frequency bandwidth, a compromise is made between the penetration depth and detection resolution. A prototype of the antenna is fabricated and its performance in landmine detection is evaluated with measurements. The measured results show that the antenna works over the frequency range of 1.5 GHz−4.5 GHz (bandwidth = 100%) with |S11| < −10 dB, a penetration depth of 10 cm in the soil with good detection resolution, gain >8 dB and axial ratio <3 dB. These factors make the proposed antenna a suitable candidate for pulse radar applications, in which low pulse distortion and wide bandwidth are key factors.
{"title":"Development of a fully planar logarithmic spiral antenna with integrated balun in UWB GPR systems for landmines detection","authors":"Narek Grigoor-Feghi, R. Masoumi, R. Kazemi","doi":"10.1080/02726343.2022.2161706","DOIUrl":"https://doi.org/10.1080/02726343.2022.2161706","url":null,"abstract":"ABSTRACT In this paper, a compact cavity-backed logarithmic spiral antenna with an integrated broadband planar balun is presented. This fully planar antenna is used for detection of anti-personnel (AP) landmines in GPR systems. Unlike conventional spiral antennas, which are fed by unbalanced coaxial cable or vertical baluns, and these feed lines make them bulky and frail, in this design, a microstrip-to-parallel strip balun is integrated with the spiral antenna and makes the whole structure compact, planar, and robust. Moreover, a metal cavity is utilized at the back of the antenna to prevent backward radiation and enhance the forward penetration depth to the ground. In choosing the operational frequency bandwidth, a compromise is made between the penetration depth and detection resolution. A prototype of the antenna is fabricated and its performance in landmine detection is evaluated with measurements. The measured results show that the antenna works over the frequency range of 1.5 GHz−4.5 GHz (bandwidth = 100%) with |S11| < −10 dB, a penetration depth of 10 cm in the soil with good detection resolution, gain >8 dB and axial ratio <3 dB. These factors make the proposed antenna a suitable candidate for pulse radar applications, in which low pulse distortion and wide bandwidth are key factors.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46179345","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 : 2022-11-17DOI: 10.1080/02726343.2022.2161708
Yuan Chi
ABSTRACT In this paper, a new wideband circularly polarized (CP) antenna with a single-layer metasurface (MT) is developed. The single-layer MT consists of 4 × 4 truncated corner square patch cells with corner-cut square slots. Compared to the single truncated corner square patch, introducing corner-cut square slot can increase the design flexibility by changing the slot size for a wider CP operating bandwidth. A slit-shaped aperture coupling structure and a microstrip fed structure are placed together to provide coupling energy to the MT. Note that such MT and slot antenna share the same reference ground plane, and there is no air gap among the overall CP antenna structure. This design could easily make the profile low and the structure compact. The tested results reveal that the presented antenna features a broad 3-dB axial ratio bandwidth (18.2%, 5.25 ~ 6.3 GHz) and a wide −10-dB impedance bandwidth (19%, 5.25 ~ 6.35 GHz), which is very suitable for wireless communication systems with low-profile and wideband requirements.
{"title":"A new wideband CP antenna with a single-layer metasurface","authors":"Yuan Chi","doi":"10.1080/02726343.2022.2161708","DOIUrl":"https://doi.org/10.1080/02726343.2022.2161708","url":null,"abstract":"ABSTRACT In this paper, a new wideband circularly polarized (CP) antenna with a single-layer metasurface (MT) is developed. The single-layer MT consists of 4 × 4 truncated corner square patch cells with corner-cut square slots. Compared to the single truncated corner square patch, introducing corner-cut square slot can increase the design flexibility by changing the slot size for a wider CP operating bandwidth. A slit-shaped aperture coupling structure and a microstrip fed structure are placed together to provide coupling energy to the MT. Note that such MT and slot antenna share the same reference ground plane, and there is no air gap among the overall CP antenna structure. This design could easily make the profile low and the structure compact. The tested results reveal that the presented antenna features a broad 3-dB axial ratio bandwidth (18.2%, 5.25 ~ 6.3 GHz) and a wide −10-dB impedance bandwidth (19%, 5.25 ~ 6.35 GHz), which is very suitable for wireless communication systems with low-profile and wideband requirements.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43196252","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 : 2022-11-17DOI: 10.1080/02726343.2022.2159423
Sayed Hesamoddin Najmolhoda, M. A. Khak, Mehdi Shirichian, A. Nikfal, R. Bayderkhani, H. Aliakbarian
ABSTRACT In this paper, a new and more efficient array architecture for small Secondary Surveillance Radar (SSR) antennas is presented. The architecture uses a side element for the generation of the Control (CTRL) beam as a new proposed method and is applied on a 7-element 1.5-m SSR antenna array. All three required patterns for secondary surveillance radar containing SUM, DIFF, and CTRL are designed and implemented in an integrated one-sheet feed network. The array antenna uses Taylor distribution for SUM port, obtaining 16 dBi and 16.7 dBi of gain at 1030 MHz and 1090 MHz, respectively, and a side lobe level of 23 dB at the measurements. It is demonstrated that the last side element at the edge is the best choice for CTRL pattern with respect to the final pattern shape, maximum achievable gain, and easy implementation in this small array architecture, which results in more than 60% of aperture efficiency. The simulation and measurement results are in acceptable agreement.
{"title":"A New Efficient Array Architecture for Small L-Band Secondary Surveillance Radars with Reduced Number of Elements","authors":"Sayed Hesamoddin Najmolhoda, M. A. Khak, Mehdi Shirichian, A. Nikfal, R. Bayderkhani, H. Aliakbarian","doi":"10.1080/02726343.2022.2159423","DOIUrl":"https://doi.org/10.1080/02726343.2022.2159423","url":null,"abstract":"ABSTRACT In this paper, a new and more efficient array architecture for small Secondary Surveillance Radar (SSR) antennas is presented. The architecture uses a side element for the generation of the Control (CTRL) beam as a new proposed method and is applied on a 7-element 1.5-m SSR antenna array. All three required patterns for secondary surveillance radar containing SUM, DIFF, and CTRL are designed and implemented in an integrated one-sheet feed network. The array antenna uses Taylor distribution for SUM port, obtaining 16 dBi and 16.7 dBi of gain at 1030 MHz and 1090 MHz, respectively, and a side lobe level of 23 dB at the measurements. It is demonstrated that the last side element at the edge is the best choice for CTRL pattern with respect to the final pattern shape, maximum achievable gain, and easy implementation in this small array architecture, which results in more than 60% of aperture efficiency. The simulation and measurement results are in acceptable agreement.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44175985","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 : 2022-10-03DOI: 10.1080/02726343.2022.2154469
P. Lei, Xiaochuan Wang, Wenzhong Lv, Jiaqing Yang, Meng Zhang, Ya-wen Liu
ABSTRACT A new topology of the power dividers is proposed, which has both good isolation performance and tunable wideband filtering. Based on the Wilkinson structure, on the one hand, to achieve good performance wideband port-to-port isolation, the two output ports are first connected in parallel through a resistor, and then through a quarter-wavelength parallel coupled line and transmission line. On the other hand, in order to realize the tunable wideband filtering response, a reconfigurable wideband filtering branch is formed, including stepped impedance open-circuit stubs, parallel coupled lines, and t-type tunable reflectors. The power divider prototype is theoretically calculated and verified by the odd-even mode method. The measurement results show that the tunable wideband filtering power divider centered at 3 GHz with a 66.7% fractional bandwidth, output port isolation maximum 15.8 dB, a return loss greater than 15 dB, while achieving wideband tunable in the range of about 0.6 GHz.
{"title":"Reconfigurable wideband filtering power divider with good isolations performance","authors":"P. Lei, Xiaochuan Wang, Wenzhong Lv, Jiaqing Yang, Meng Zhang, Ya-wen Liu","doi":"10.1080/02726343.2022.2154469","DOIUrl":"https://doi.org/10.1080/02726343.2022.2154469","url":null,"abstract":"ABSTRACT A new topology of the power dividers is proposed, which has both good isolation performance and tunable wideband filtering. Based on the Wilkinson structure, on the one hand, to achieve good performance wideband port-to-port isolation, the two output ports are first connected in parallel through a resistor, and then through a quarter-wavelength parallel coupled line and transmission line. On the other hand, in order to realize the tunable wideband filtering response, a reconfigurable wideband filtering branch is formed, including stepped impedance open-circuit stubs, parallel coupled lines, and t-type tunable reflectors. The power divider prototype is theoretically calculated and verified by the odd-even mode method. The measurement results show that the tunable wideband filtering power divider centered at 3 GHz with a 66.7% fractional bandwidth, output port isolation maximum 15.8 dB, a return loss greater than 15 dB, while achieving wideband tunable in the range of about 0.6 GHz.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43143794","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 : 2022-10-03DOI: 10.1080/02726343.2022.2154465
Yue Fan, Zhi Li, Zijun Zheng, G. Han, L. Han, Wenmei Zhang
ABSTRACT This paper demonstrates a broadband metasurface antenna with stable gain. A 4 × 4 square patches metasurface loaded with nonuniform hexagonal slots is proposed. To achieve stable radiation performance in broadband range, two characteristic modes with the same current direction are selected as operating modes of the metasurface. A slot antenna is employed to excite the metasurface. By combining the resonant modes of metasurface and slot antenna, the broadband is obtained. The measured results show that, the −10 dB impedance bandwidth of the proposed antenna is 4.36–8.21 GHz (61.2%), the 2 dB gain bandwidth is 4.36–7.2 GHz (49.1%), and the peak gain value reaches 10.6 dBi.
{"title":"A broadband stable gain antenna using nonuniform hexagonal-Slot metasurface","authors":"Yue Fan, Zhi Li, Zijun Zheng, G. Han, L. Han, Wenmei Zhang","doi":"10.1080/02726343.2022.2154465","DOIUrl":"https://doi.org/10.1080/02726343.2022.2154465","url":null,"abstract":"ABSTRACT This paper demonstrates a broadband metasurface antenna with stable gain. A 4 × 4 square patches metasurface loaded with nonuniform hexagonal slots is proposed. To achieve stable radiation performance in broadband range, two characteristic modes with the same current direction are selected as operating modes of the metasurface. A slot antenna is employed to excite the metasurface. By combining the resonant modes of metasurface and slot antenna, the broadband is obtained. The measured results show that, the −10 dB impedance bandwidth of the proposed antenna is 4.36–8.21 GHz (61.2%), the 2 dB gain bandwidth is 4.36–7.2 GHz (49.1%), and the peak gain value reaches 10.6 dBi.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41461972","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 : 2022-10-03DOI: 10.1080/02726343.2022.2154468
Min Wang, Xuan Li, Dongsheng Mo, Zhengchuan Chen, Zhong Tian
ABSTRACT A single-layer substrate-integrated waveguide (SIW) cavity-backed slot array antenna with broad impedance bandwidth and improved gain is presented in this paper. In the element design, a multi-branch slot and a pair of inclined slots are designed on the top layer of the SIW as radiating structure and the grounded coplanar waveguide feeding structure are used for impedance matching, which ensures that the triple special resonant modes with the odd TE120 mode, the half TE120 mode, and a hybrid mode can be excited successfully to obtain broad impedance bandwidth and high gain, because of its low order and adjacent working frequencies points. Following this, an array antenna consisting of four elements and a four-way microstrip feeding network using only single-layer substrate structure is simulated and fabricated. The measured impedance bandwidth of the four-element array antenna achieves up to 34.4% and the measure peak gain at desired frequency band is 14.4 dBi with an aperture efficiency of 71.1%. The measured results prove that the proposed design has advantages of simple structure, broadband, and high gain, which is expected to be applied in high-speed vehicular communication system.
{"title":"A broadband single-layer substrate integrated waveguide cavity-backed slot array antenna with improved gain","authors":"Min Wang, Xuan Li, Dongsheng Mo, Zhengchuan Chen, Zhong Tian","doi":"10.1080/02726343.2022.2154468","DOIUrl":"https://doi.org/10.1080/02726343.2022.2154468","url":null,"abstract":"ABSTRACT A single-layer substrate-integrated waveguide (SIW) cavity-backed slot array antenna with broad impedance bandwidth and improved gain is presented in this paper. In the element design, a multi-branch slot and a pair of inclined slots are designed on the top layer of the SIW as radiating structure and the grounded coplanar waveguide feeding structure are used for impedance matching, which ensures that the triple special resonant modes with the odd TE120 mode, the half TE120 mode, and a hybrid mode can be excited successfully to obtain broad impedance bandwidth and high gain, because of its low order and adjacent working frequencies points. Following this, an array antenna consisting of four elements and a four-way microstrip feeding network using only single-layer substrate structure is simulated and fabricated. The measured impedance bandwidth of the four-element array antenna achieves up to 34.4% and the measure peak gain at desired frequency band is 14.4 dBi with an aperture efficiency of 71.1%. The measured results prove that the proposed design has advantages of simple structure, broadband, and high gain, which is expected to be applied in high-speed vehicular communication system.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44127575","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 : 2022-10-03DOI: 10.1080/02726343.2022.2154466
Sonal Gupta, S. Patil, C. Dalela, B. Kanaujia
ABSTRACT In this article, an antenna structure consisting fractal defected ground monopole antenna for circularly polarized radiation is presented. The characteristics of circular polarization in the proposed structure are obtained by fractal defected ground structure. The third iterative h-shaped fractal slot antenna is fabricated and examined on Rogers RT/duroid 5880 substrate for validating the simulated results. The best circular polarization radiation is obtained by varying the key parameters of the proposed geometry. The simulated and measured results confirmed that the proposed antenna can be adequately produced an impedance bandwidth (2.15 GHz – 3.55 GHz) of 49.12% with 3 dB axial ratio bandwidth (2.54 GHz – 3.03 GHz) of 17.59%, while the measured peak gain of the proposed structure is 2.99 dBic. The proposed work is suitable for Bluetooth/LTE/CNSS/S-band and CA-band applications.
{"title":"Circularly polarized fractal defected ground monopole antenna for Bluetooth/LTE/CNSS/S-band and CA- band applications","authors":"Sonal Gupta, S. Patil, C. Dalela, B. Kanaujia","doi":"10.1080/02726343.2022.2154466","DOIUrl":"https://doi.org/10.1080/02726343.2022.2154466","url":null,"abstract":"ABSTRACT In this article, an antenna structure consisting fractal defected ground monopole antenna for circularly polarized radiation is presented. The characteristics of circular polarization in the proposed structure are obtained by fractal defected ground structure. The third iterative h-shaped fractal slot antenna is fabricated and examined on Rogers RT/duroid 5880 substrate for validating the simulated results. The best circular polarization radiation is obtained by varying the key parameters of the proposed geometry. The simulated and measured results confirmed that the proposed antenna can be adequately produced an impedance bandwidth (2.15 GHz – 3.55 GHz) of 49.12% with 3 dB axial ratio bandwidth (2.54 GHz – 3.03 GHz) of 17.59%, while the measured peak gain of the proposed structure is 2.99 dBic. The proposed work is suitable for Bluetooth/LTE/CNSS/S-band and CA-band applications.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42965263","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 : 2022-10-03DOI: 10.1080/02726343.2022.2154945
Xueyuan Guan, Xiangjun Zhang, Q. Bian, Yushun Liu
ABSTRACT A novel substrate-integrated low-temperature ceramic co-fired (LTCC) millimeter-wave bandpass filter operating in the Ka-band is proposed. The filter is composed of multiple layers of media and metal plane. The dielectric resonators (DRs) with high dielectric constant are embedded in LTCC dielectric cavity excavated in LTCC dielectric. The input/output (I/O) is exploited by the slot on metal plane feed by CPW （Co-Planar Waveguide）structure on the top and bottom metal planes, which make the filter able to be integrated to the other components. Simulations and measurements show that the filter has a center frequency of 35 GHz, a relative bandwidth of about 6%, an insertion loss of 1.25 dB, and a return loss of −15 dB in the passband. The filter has many advantages, such as high selectivity, wide bandwidth, low profile, small volume, and so on, which has high engineering application in 5G communications.
{"title":"Compact LTCC millimeter wave bandpass filter with imbedded dielectric resonators","authors":"Xueyuan Guan, Xiangjun Zhang, Q. Bian, Yushun Liu","doi":"10.1080/02726343.2022.2154945","DOIUrl":"https://doi.org/10.1080/02726343.2022.2154945","url":null,"abstract":"ABSTRACT A novel substrate-integrated low-temperature ceramic co-fired (LTCC) millimeter-wave bandpass filter operating in the Ka-band is proposed. The filter is composed of multiple layers of media and metal plane. The dielectric resonators (DRs) with high dielectric constant are embedded in LTCC dielectric cavity excavated in LTCC dielectric. The input/output (I/O) is exploited by the slot on metal plane feed by CPW （Co-Planar Waveguide）structure on the top and bottom metal planes, which make the filter able to be integrated to the other components. Simulations and measurements show that the filter has a center frequency of 35 GHz, a relative bandwidth of about 6%, an insertion loss of 1.25 dB, and a return loss of −15 dB in the passband. The filter has many advantages, such as high selectivity, wide bandwidth, low profile, small volume, and so on, which has high engineering application in 5G communications.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47814748","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 : 2022-10-03DOI: 10.1080/02726343.2022.2154467
Lanlan Jiang, Weihua Luo, Zihao Wang, Yi Ren
ABSTRACT A millimeter wave dielectric resonator antenna (DRA) array with high-gain and high-selectivity filtering response is proposed, which is composed of stacked feeding network and stacked DRA. The stacked feeding network consisting of two layers of thin substrate has the efficient characteristics to expand and integrate. The band-pass filter formed by complementary split ring resonator (CSRR) structure generates radiation nulls at the edge of the high-frequency band. With the improved filtering stubs loaded at the end of the H-shaped microstrip power divider, a radiation null at the edge of the low-frequency band is obtained and the roll-off degree at the edge of the high-frequency band is improved. By embedding the metal column in the fork-shaped stub, the suppression level of the low-frequency stopband is improved. A prototype of the proposed DRA array is fabricated and measured, which shows 7.2% relative bandwidth and a stable directional pattern in the range of 26.28–28.25 GHz with an average gain of 9.57 dBi. And an out-of-band suppression level of 18 dB is achieved. The DRA array can be applied for 5 G millimeter wave band to support high-speed communications at short distance.
{"title":"A high-gain filtering DRA array for millimeter wave communication","authors":"Lanlan Jiang, Weihua Luo, Zihao Wang, Yi Ren","doi":"10.1080/02726343.2022.2154467","DOIUrl":"https://doi.org/10.1080/02726343.2022.2154467","url":null,"abstract":"ABSTRACT A millimeter wave dielectric resonator antenna (DRA) array with high-gain and high-selectivity filtering response is proposed, which is composed of stacked feeding network and stacked DRA. The stacked feeding network consisting of two layers of thin substrate has the efficient characteristics to expand and integrate. The band-pass filter formed by complementary split ring resonator (CSRR) structure generates radiation nulls at the edge of the high-frequency band. With the improved filtering stubs loaded at the end of the H-shaped microstrip power divider, a radiation null at the edge of the low-frequency band is obtained and the roll-off degree at the edge of the high-frequency band is improved. By embedding the metal column in the fork-shaped stub, the suppression level of the low-frequency stopband is improved. A prototype of the proposed DRA array is fabricated and measured, which shows 7.2% relative bandwidth and a stable directional pattern in the range of 26.28–28.25 GHz with an average gain of 9.57 dBi. And an out-of-band suppression level of 18 dB is achieved. The DRA array can be applied for 5 G millimeter wave band to support high-speed communications at short distance.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49018996","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: 10.1080/02726343.2022.2140915
Zhiyuan Yang, Jie Zhang, Yufeng Liu, Wenmei Zhang, Qiang Zhang, Yang Gao, Zongwei Tong
ABSTRACT A novel wideband reflectarray antenna based on a sub-wavelength Archimedes spiral unit cell is proposed in this paper. The size of the unit cell is fixed to ( -the free space wavelength at 5.8 GHz), and the reflection phase variation can be obtained by changing the inward extension length of the arms. After the element simulation analysis, a smooth and almost linear reflection phase curve is achieved. The phase range can reach more than 500°, which is enough to meet the phase shift requirement of the reflectarray. Based on the proposed unit cell, a 10 × 10-element reflectarray with the size of 220 mm×220 mm is designed, fabricated, and measured. The measured result agrees well with the simulations, which show relatively wide 1- and 3-dB gain bandwidths of 20.7% (5.57–6.77 GHz) and 31.4% (5.31–7.13 GHz), respectively. The measured gain at its working frequency of 5.8 GHz is 18.9 dBi with an aperture efficiency of 34.2%. Furthermore, the cross-polarization levels of the proposed antenna are less than −25 dB, which attributes to all the elements that are arranged mirror symmetrically.
{"title":"A novel wideband reflectarray using sub-wavelength Archimedes spiral unit cell","authors":"Zhiyuan Yang, Jie Zhang, Yufeng Liu, Wenmei Zhang, Qiang Zhang, Yang Gao, Zongwei Tong","doi":"10.1080/02726343.2022.2140915","DOIUrl":"https://doi.org/10.1080/02726343.2022.2140915","url":null,"abstract":"ABSTRACT A novel wideband reflectarray antenna based on a sub-wavelength Archimedes spiral unit cell is proposed in this paper. The size of the unit cell is fixed to ( -the free space wavelength at 5.8 GHz), and the reflection phase variation can be obtained by changing the inward extension length of the arms. After the element simulation analysis, a smooth and almost linear reflection phase curve is achieved. The phase range can reach more than 500°, which is enough to meet the phase shift requirement of the reflectarray. Based on the proposed unit cell, a 10 × 10-element reflectarray with the size of 220 mm×220 mm is designed, fabricated, and measured. The measured result agrees well with the simulations, which show relatively wide 1- and 3-dB gain bandwidths of 20.7% (5.57–6.77 GHz) and 31.4% (5.31–7.13 GHz), respectively. The measured gain at its working frequency of 5.8 GHz is 18.9 dBi with an aperture efficiency of 34.2%. Furthermore, the cross-polarization levels of the proposed antenna are less than −25 dB, which attributes to all the elements that are arranged mirror symmetrically.","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":"49630260","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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