Pub Date : 2022-12-21eCollection Date: 2022-01-01DOI: 10.4102/jamba.v14i1.1379
Jason K von Meding
{"title":"An overview of Volume 14, No 1 (2022).","authors":"Jason K von Meding","doi":"10.4102/jamba.v14i1.1379","DOIUrl":"10.4102/jamba.v14i1.1379","url":null,"abstract":"","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":"2 1","pages":"1379"},"PeriodicalIF":1.4,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11021877/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81427199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-17DOI: 10.1080/02726343.2022.2161705
H. Hao, Huangxia Xu, Qinxuan Ling, Yunrui Wang
ABSTRACT According to the development demand for radio frequency module function integration, a filtering power divider with wideband external suppression and high isolation is designed based on the traditional Wilkinson power divider. The working mechanism of the device is analyzed by using the odd-even mode method. Utilizing the branch loading on the coupled-line and the addition of a step impedance open-circuit stub, we can realize the filtering function, widen the passband bandwidth, and improve the performance of stopband rejection. Through the bending of microstrip line between the input and output parts, it is conducive to the physical access of isolation resistance, and the isolation performance between output ports is improved. The research results show that the central working frequency of the filtering power divider is 2.85 GHz (f 0). The 3 dB bandwidth width is 1.51 GHz, and the relative bandwidth is 52.9%. The out-of-band suppression is lower than −20 dB in the range of 3.96 to 11.1 GHz (3.89f 0), and the isolation between output ports is lower than −24.4 dB in the ultra-wideband range of DC to 12 GHz. The device has excellent application prospects in radio frequency communication systems, such as amplifiers and antenna arrays.
{"title":"Design of a planar filtering power divider with wide-stopband suppression","authors":"H. Hao, Huangxia Xu, Qinxuan Ling, Yunrui Wang","doi":"10.1080/02726343.2022.2161705","DOIUrl":"https://doi.org/10.1080/02726343.2022.2161705","url":null,"abstract":"ABSTRACT According to the development demand for radio frequency module function integration, a filtering power divider with wideband external suppression and high isolation is designed based on the traditional Wilkinson power divider. The working mechanism of the device is analyzed by using the odd-even mode method. Utilizing the branch loading on the coupled-line and the addition of a step impedance open-circuit stub, we can realize the filtering function, widen the passband bandwidth, and improve the performance of stopband rejection. Through the bending of microstrip line between the input and output parts, it is conducive to the physical access of isolation resistance, and the isolation performance between output ports is improved. The research results show that the central working frequency of the filtering power divider is 2.85 GHz (f 0). The 3 dB bandwidth width is 1.51 GHz, and the relative bandwidth is 52.9%. The out-of-band suppression is lower than −20 dB in the range of 3.96 to 11.1 GHz (3.89f 0), and the isolation between output ports is lower than −24.4 dB in the ultra-wideband range of DC to 12 GHz. The device has excellent application prospects in radio frequency communication systems, such as amplifiers and antenna arrays.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":"42 1","pages":"549 - 558"},"PeriodicalIF":0.8,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45423273","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: 10.1080/02726343.2022.2161709
S. Kühn
ABSTRACT Aiming to bypass the Lorentz force, this study analyzes Maxwell’s equations from the perspective of a receiver at rest. This approach is necessary because experimental results suggest that the general validity of the Lorentz force might be questionable in non-stationary cases. Calculations in the receiver’s rest frame are complicated and, thus, are rarely performed. In particular, the most important case is missing: namely, the solution of a Hertzian dipole moving in the rest frame of the receiver. The present article addresses this knowledge gap. First, this work demonstrates how the inhomogeneous wave equation can be derived and generically solved in the rest frame of the receiver. Subsequently, the solution for two uniformly moving point charges is derived, and the close connection between Maxwell’s equations and Weber electrodynamics is highlighted. The gained insights are then applied to compute the far-field solution of a moving Hertzian dipole in the receiver’s rest frame. The resulting solution is analyzed, and an explanation is presented regarding why an invariant and symmetric wave equation is possible for Weber electrodynamics and why the invariance could be the consequence of a quantum effect.
{"title":"Inhomogeneous wave equation, Liénard-Wiechert potentials, and Hertzian dipoles in Weber electrodynamics","authors":"S. Kühn","doi":"10.1080/02726343.2022.2161709","DOIUrl":"https://doi.org/10.1080/02726343.2022.2161709","url":null,"abstract":"ABSTRACT Aiming to bypass the Lorentz force, this study analyzes Maxwell’s equations from the perspective of a receiver at rest. This approach is necessary because experimental results suggest that the general validity of the Lorentz force might be questionable in non-stationary cases. Calculations in the receiver’s rest frame are complicated and, thus, are rarely performed. In particular, the most important case is missing: namely, the solution of a Hertzian dipole moving in the rest frame of the receiver. The present article addresses this knowledge gap. First, this work demonstrates how the inhomogeneous wave equation can be derived and generically solved in the rest frame of the receiver. Subsequently, the solution for two uniformly moving point charges is derived, and the close connection between Maxwell’s equations and Weber electrodynamics is highlighted. The gained insights are then applied to compute the far-field solution of a moving Hertzian dipole in the receiver’s rest frame. The resulting solution is analyzed, and an explanation is presented regarding why an invariant and symmetric wave equation is possible for Weber electrodynamics and why the invariance could be the consequence of a quantum effect.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":"42 1","pages":"571 - 593"},"PeriodicalIF":0.8,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48518763","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: 10.1080/02726343.2022.2161707
Baidenger Agyekum Twumasi, Jia‐lin Li, Ebenezer Tawiah Ashong, Christian Dzah, D. Pomary
ABSTRACT Motivated by the quest to curtail the high mortality rate of breast cancer, the manuscript proposes the sensitivity enhancement of monopole antenna for hyperthermia application by using electromagnetic time reversal (EMTR) technique with transformation structures for early treatment of multi-focal breast tumors. The EMTR technique is characterized with temporal and spatial focusing, hence enhancing the visibility of tumors embedded in the breast medium. In this study, we aim at the non-invasive power deposition on sub-wavelength-sized tumors at sub-wavelength separation incorporation with sub-wavelength scatterers. The paper is focused on enhancing the sensitivity of scattering reception in TR algorithm for hyperthermia application using sub-wavelength sized scatterers. The proposed applicator is an ultra-wideband (UWB) monopole antenna designed with sub-wavelength-sized split ring embedded square patch (SRESP) on a grounded substrate placed below it at some distance to serve as near field scatterer. Another plate of sub-wavelength scatterers but without the ground plate is placed in close proximity to the unhealthy breast in-conjunction with four ultra-wideband antenna time reversal mirrors (UWB-TRM). The proposed method shows promising potential for the selective power deposition for hyperthermia of sub-wavelength-sized tumors at sub-wavelength separations. This technique of enhancing front-end sensor sensitivity can also be extended to other optimization techniques for selective power deposition in hyperthermia of breast cancer.
{"title":"Time reversal mirror for hyperthermia of multi-focal breast tumors using electromagnetic time reversal technique","authors":"Baidenger Agyekum Twumasi, Jia‐lin Li, Ebenezer Tawiah Ashong, Christian Dzah, D. Pomary","doi":"10.1080/02726343.2022.2161707","DOIUrl":"https://doi.org/10.1080/02726343.2022.2161707","url":null,"abstract":"ABSTRACT Motivated by the quest to curtail the high mortality rate of breast cancer, the manuscript proposes the sensitivity enhancement of monopole antenna for hyperthermia application by using electromagnetic time reversal (EMTR) technique with transformation structures for early treatment of multi-focal breast tumors. The EMTR technique is characterized with temporal and spatial focusing, hence enhancing the visibility of tumors embedded in the breast medium. In this study, we aim at the non-invasive power deposition on sub-wavelength-sized tumors at sub-wavelength separation incorporation with sub-wavelength scatterers. The paper is focused on enhancing the sensitivity of scattering reception in TR algorithm for hyperthermia application using sub-wavelength sized scatterers. The proposed applicator is an ultra-wideband (UWB) monopole antenna designed with sub-wavelength-sized split ring embedded square patch (SRESP) on a grounded substrate placed below it at some distance to serve as near field scatterer. Another plate of sub-wavelength scatterers but without the ground plate is placed in close proximity to the unhealthy breast in-conjunction with four ultra-wideband antenna time reversal mirrors (UWB-TRM). The proposed method shows promising potential for the selective power deposition for hyperthermia of sub-wavelength-sized tumors at sub-wavelength separations. This technique of enhancing front-end sensor sensitivity can also be extended to other optimization techniques for selective power deposition in hyperthermia of breast cancer.","PeriodicalId":50542,"journal":{"name":"Electromagnetics","volume":"42 1","pages":"594 - 615"},"PeriodicalIF":0.8,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46582255","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: 10.1080/02726343.2022.2161706
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":"42 1","pages":"559 - 570"},"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":"42 1","pages":"616 - 623"},"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":"42 1","pages":"529 - 548"},"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":"42 1","pages":"513 - 521"},"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":"42 1","pages":"463 - 472"},"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":"42 1","pages":"473 - 484"},"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}
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