Pub Date : 2019-05-01DOI: 10.1109/IEEE-IWS.2019.8804025
Shahid Iqbal, Jun Luo, T. Cui
Integration of multiple functionalities into the same meta-device is crucial and is the hot topic of research these days. In this article, we present frequency dependent bifunctional coding metasurface (MS). Sixteen distinct particles are designed which have independent distinct reflection phases in lower X-band and higher Ku-band. We aim to design different bifunctional coding MSs with proper selection of coding particles and proper spatial distribution of them. Three contributions are pro-vided in this work. In the first stage, we present a coding MS which can focus the reflected waves in the lower band and defocus the same in a higher band. In the second case, a MS is de-signed which shape the reflected field in the quad beam in the lower band and provide an anomalous reflection in the higher band. In the last case, a MS is designed which can split the reflected field into two equal parts in lower band and provide an anomalous reflection in the higher band. The concept can be further extended to realize multiple functionalities in multiple bands and can be extended to realize similar functionalities in THz and optical regimes.
{"title":"Bifunctional Meta devices based on frequency-dependent digital coding-Metasurface","authors":"Shahid Iqbal, Jun Luo, T. Cui","doi":"10.1109/IEEE-IWS.2019.8804025","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2019.8804025","url":null,"abstract":"Integration of multiple functionalities into the same meta-device is crucial and is the hot topic of research these days. In this article, we present frequency dependent bifunctional coding metasurface (MS). Sixteen distinct particles are designed which have independent distinct reflection phases in lower X-band and higher Ku-band. We aim to design different bifunctional coding MSs with proper selection of coding particles and proper spatial distribution of them. Three contributions are pro-vided in this work. In the first stage, we present a coding MS which can focus the reflected waves in the lower band and defocus the same in a higher band. In the second case, a MS is de-signed which shape the reflected field in the quad beam in the lower band and provide an anomalous reflection in the higher band. In the last case, a MS is designed which can split the reflected field into two equal parts in lower band and provide an anomalous reflection in the higher band. The concept can be further extended to realize multiple functionalities in multiple bands and can be extended to realize similar functionalities in THz and optical regimes.","PeriodicalId":306297,"journal":{"name":"2019 IEEE MTT-S International Wireless Symposium (IWS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122819009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/IEEE-IWS.2019.8803883
Yongrong Shi, Ming Zhou, Hao Wang, W. Feng, Kaohua Qian
In this paper, a frequency-modulated continuous-wave (FMCW) SAR imaging radar front-end architecture has been proposed including antenna, W-band transceiver, IF receiver and frequency synthesizer. The dielectric lens horn antennas are applied as the Tx and Rx antennas. The transceiver consists of traditional CNC milling waveguide circuit module with Rogers5880 PCB broad. Firstly, the frequency synthesizer generates X-band FMCW signal and feeds into the W-band transmitter, which is transmitted to the target through Tx antenna. The echo is collected by the Rx dielectric lens horn antenna, amplified and down-conversion by the W-band receiver. The I/Q IF signals are finally received by the IF receiver, which is sent to ADC and signal processing module.
{"title":"W-band Dielectric Lens Horn Antenna and FMCW Circuit Module for SAR Imaging Radar","authors":"Yongrong Shi, Ming Zhou, Hao Wang, W. Feng, Kaohua Qian","doi":"10.1109/IEEE-IWS.2019.8803883","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2019.8803883","url":null,"abstract":"In this paper, a frequency-modulated continuous-wave (FMCW) SAR imaging radar front-end architecture has been proposed including antenna, W-band transceiver, IF receiver and frequency synthesizer. The dielectric lens horn antennas are applied as the Tx and Rx antennas. The transceiver consists of traditional CNC milling waveguide circuit module with Rogers5880 PCB broad. Firstly, the frequency synthesizer generates X-band FMCW signal and feeds into the W-band transmitter, which is transmitted to the target through Tx antenna. The echo is collected by the Rx dielectric lens horn antenna, amplified and down-conversion by the W-band receiver. The I/Q IF signals are finally received by the IF receiver, which is sent to ADC and signal processing module.","PeriodicalId":306297,"journal":{"name":"2019 IEEE MTT-S International Wireless Symposium (IWS)","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131446888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/IEEE-IWS.2019.8804086
M. S. Sadiq, C. Ruan
In this paper, a compact, mechanically rugged, DC grounded 45° slant polarized antenna having very low gain ripple in omnidirectional pattern is proposed. The antenna is based on the coaxial cylinder structures, which consists of oversize coaxial cylinders, slots and their feeding assembly and a matching unit. The slant polarization property is realized by four angular slots surrounding the axis of coaxial cylinder in the outer conductor. The antenna is dc ground which eliminates the electrostatic discharge ESD problems. Simulation results show that the antenna bandwidth is of 8.1% (2.56GHz to 2.78 GHz), gain variation in the horizontal plane is less than ±0.14 dB while the cross-polarization level is below 14dB over the whole bandwidth (2.56–2.78 GHz).
{"title":"A Compact, Mechanically rugged, DC Grounded 45° Slant Polarized Low Gain Ripple Omnidirectional Antenna","authors":"M. S. Sadiq, C. Ruan","doi":"10.1109/IEEE-IWS.2019.8804086","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2019.8804086","url":null,"abstract":"In this paper, a compact, mechanically rugged, DC grounded 45° slant polarized antenna having very low gain ripple in omnidirectional pattern is proposed. The antenna is based on the coaxial cylinder structures, which consists of oversize coaxial cylinders, slots and their feeding assembly and a matching unit. The slant polarization property is realized by four angular slots surrounding the axis of coaxial cylinder in the outer conductor. The antenna is dc ground which eliminates the electrostatic discharge ESD problems. Simulation results show that the antenna bandwidth is of 8.1% (2.56GHz to 2.78 GHz), gain variation in the horizontal plane is less than ±0.14 dB while the cross-polarization level is below 14dB over the whole bandwidth (2.56–2.78 GHz).","PeriodicalId":306297,"journal":{"name":"2019 IEEE MTT-S International Wireless Symposium (IWS)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131626677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/IEEE-IWS.2019.8804034
Xuan Wang, Shubo Dun, Chun Xiao Li, Run Sheng Zhang
A novel algorithm called two-dimensional decomposition Look-Up-Table (TDD-LUT) is proposed in this paper, to address the I/Q imbalance issue facing wideband, uncooperative multi-signals spectrum surveillance applications. TDD-LUT decomposes mixed-mismatches and reconstructs compensation process according to different receivers configurations. Through MATLAB&SIMULINK simulation, The algorithm is demonstrated to improve 20-40dB image frequency rejection ratio (IRR) in a reconfigurable wideband receiver case.
{"title":"Two-Dimensional Decomposition LUT Correction for I/Q Imbalance in Reconfigurable Wideband Receivers","authors":"Xuan Wang, Shubo Dun, Chun Xiao Li, Run Sheng Zhang","doi":"10.1109/IEEE-IWS.2019.8804034","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2019.8804034","url":null,"abstract":"A novel algorithm called two-dimensional decomposition Look-Up-Table (TDD-LUT) is proposed in this paper, to address the I/Q imbalance issue facing wideband, uncooperative multi-signals spectrum surveillance applications. TDD-LUT decomposes mixed-mismatches and reconstructs compensation process according to different receivers configurations. Through MATLAB&SIMULINK simulation, The algorithm is demonstrated to improve 20-40dB image frequency rejection ratio (IRR) in a reconfigurable wideband receiver case.","PeriodicalId":306297,"journal":{"name":"2019 IEEE MTT-S International Wireless Symposium (IWS)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132791644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/IEEE-IWS.2019.8804038
Mahmood Noweir, A. Abdelhafiz, M. Helaoui, F. Ghannouchi, D. Oblak
In this paper, we propose a digital sub-band (SB) filtering layout for Radio-over-Fiber (RoF) downlink transmitter. A proof-of-principle demonstration of 4 and 8 SB processing for a 256 QAM 100 MHz-bandwidth long-term evolution advanced (LTE-A) signal is presented. To alleviate the high processing speed required for next generation 5G signals, perfect reconstruction quadrature mirror filters (QMFs) are used to split and downsample a contiguous-carrier signal into smaller SBs: each containing part of the frequency content. Through measurements and simulation results, this paper demonstrated that the overall signal quality is maintained while achieving a reduction in the processing speed as well as an improvement in the adjacent carrier power ratio (ACPR). Our results demonstrate the advantages of the proposed technique in RoF transmitters networks.
{"title":"Low Speed Digital RoF Transmitter Linearizer Using Sub-band Signal Processing Technique","authors":"Mahmood Noweir, A. Abdelhafiz, M. Helaoui, F. Ghannouchi, D. Oblak","doi":"10.1109/IEEE-IWS.2019.8804038","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2019.8804038","url":null,"abstract":"In this paper, we propose a digital sub-band (SB) filtering layout for Radio-over-Fiber (RoF) downlink transmitter. A proof-of-principle demonstration of 4 and 8 SB processing for a 256 QAM 100 MHz-bandwidth long-term evolution advanced (LTE-A) signal is presented. To alleviate the high processing speed required for next generation 5G signals, perfect reconstruction quadrature mirror filters (QMFs) are used to split and downsample a contiguous-carrier signal into smaller SBs: each containing part of the frequency content. Through measurements and simulation results, this paper demonstrated that the overall signal quality is maintained while achieving a reduction in the processing speed as well as an improvement in the adjacent carrier power ratio (ACPR). Our results demonstrate the advantages of the proposed technique in RoF transmitters networks.","PeriodicalId":306297,"journal":{"name":"2019 IEEE MTT-S International Wireless Symposium (IWS)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133990168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/IEEE-IWS.2019.8803924
Yizhu Shen, Jiawei Yang, Sanming Hu
This paper presents a single-layered coding metasurface with inherently integrated feeding source. It alleviates the feeding blockage and alignment issues in conventional coding metasurface, and achieves a low-profile dimension. The working principle of the proposed coding metasurface is introduced followed by an example demonstration working at millimeter-wave band. It is applied with a chessboard coding sequence, and achieves the beam splitting performance with a compact size.
{"title":"A Single-Layer Integrated Coding Metasurface with Flexible Beam Controlling","authors":"Yizhu Shen, Jiawei Yang, Sanming Hu","doi":"10.1109/IEEE-IWS.2019.8803924","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2019.8803924","url":null,"abstract":"This paper presents a single-layered coding metasurface with inherently integrated feeding source. It alleviates the feeding blockage and alignment issues in conventional coding metasurface, and achieves a low-profile dimension. The working principle of the proposed coding metasurface is introduced followed by an example demonstration working at millimeter-wave band. It is applied with a chessboard coding sequence, and achieves the beam splitting performance with a compact size.","PeriodicalId":306297,"journal":{"name":"2019 IEEE MTT-S International Wireless Symposium (IWS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134623226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/IEEE-IWS.2019.8803976
Jiale Yang, Gongan Qiu, Jin Shi
Multi-port filtering power dividing networks have been applied widely in modern communication systems due to their high integration level by fusing filtering function and power dividing function into one component. The reported filtering power dividing networks are realized by using filters cascading to power dividing network or using the two identical filtering structures symmetrically coupled to one input feed line, which always suffer from large circuit size. In this paper, three different methods for size reduction are reviewed, summarized and compared with each other, such as utilizing filtering structures to replace the quarter-wavelength transmission structures of power dividing network, using couplings between the four resonators formed in a ring-type coupling topology, as well as employing one filtering structure coupled with input/output feed lines. Each method is demonstrated by one specific case.
{"title":"Multi-port Filtering Power Dividing Networks","authors":"Jiale Yang, Gongan Qiu, Jin Shi","doi":"10.1109/IEEE-IWS.2019.8803976","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2019.8803976","url":null,"abstract":"Multi-port filtering power dividing networks have been applied widely in modern communication systems due to their high integration level by fusing filtering function and power dividing function into one component. The reported filtering power dividing networks are realized by using filters cascading to power dividing network or using the two identical filtering structures symmetrically coupled to one input feed line, which always suffer from large circuit size. In this paper, three different methods for size reduction are reviewed, summarized and compared with each other, such as utilizing filtering structures to replace the quarter-wavelength transmission structures of power dividing network, using couplings between the four resonators formed in a ring-type coupling topology, as well as employing one filtering structure coupled with input/output feed lines. Each method is demonstrated by one specific case.","PeriodicalId":306297,"journal":{"name":"2019 IEEE MTT-S International Wireless Symposium (IWS)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114806666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/IEEE-IWS.2019.8804080
K. Inomata, Z. R. Lin, K. Koshino, W. Oliver, J. Tsai, T. Yamamoto, Y. Nakamura
Single photon detection is a requisite technique in quantum-optics experiments in both the optical and the microwave domains. However, the energy of microwave quanta are four to five orders of magnitude less than their optical counterpart, making the efficient detection of single microwave photon extremely challenging. Here, we demonstrate the detection of a single microwave photon propagating through a waveguide. The detector is implemented with an "impedance-matched" artificial Λ system comprising the dressed states of a driven superconducting qubit coupled to a microwave resonator. We attain a single-photon detection efficiency of 0.66±0.06 with a reset time of ~400 ns. This detector can be exploited for various applications in quantum sensing, quantum communication and quantum information processing.
{"title":"Microwave single-photon detection based on dressed-state engineering","authors":"K. Inomata, Z. R. Lin, K. Koshino, W. Oliver, J. Tsai, T. Yamamoto, Y. Nakamura","doi":"10.1109/IEEE-IWS.2019.8804080","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2019.8804080","url":null,"abstract":"Single photon detection is a requisite technique in quantum-optics experiments in both the optical and the microwave domains. However, the energy of microwave quanta are four to five orders of magnitude less than their optical counterpart, making the efficient detection of single microwave photon extremely challenging. Here, we demonstrate the detection of a single microwave photon propagating through a waveguide. The detector is implemented with an \"impedance-matched\" artificial Λ system comprising the dressed states of a driven superconducting qubit coupled to a microwave resonator. We attain a single-photon detection efficiency of 0.66±0.06 with a reset time of ~400 ns. This detector can be exploited for various applications in quantum sensing, quantum communication and quantum information processing.","PeriodicalId":306297,"journal":{"name":"2019 IEEE MTT-S International Wireless Symposium (IWS)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115896570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/IEEE-IWS.2019.8804146
Zhidong Ruan, Dongya Shen, Hong Yuan, Xiupu Zhang
An ultra-wideband bandpass (UWB) filter using integrated substrate gap waveguide (ISGW) technology is proposed, which has ultra-wideband and high selectivity. The UWB ISGW bandpass filter structure consists of three layer dielectric substrates, the top substrate uses metallic via-holes and metallic patches to implement perfect magnetic conductor (PMC) structure, which is suitable for packaging substrate integrated waveguide (SIW) filters to avoid external interference and loss caused by radiation and internal radiation leakage, the middle layer substrate provides a stable gap layer, and the base substrate is used to obtain a SIW filter by etching the slots in the metal plane and placing metallic via-holes in the middle of the layer, i.e. a self-packaged UWB ISGW filter. The proposed filter was fabricated and tested at a center frequency of 17.5 GHz as an example. The measurements show that the filter has a passband from 14.4 to 20.7 GHz, i.e. This filter has a fractional bandwidth (FBW) of 36%, and an insertion loss of 0.91 dB. More importantly, thanks to ISGW, two transmission zeros are obtained at 12.9 and 22.1 GHz to improve high selectivity.
{"title":"A Self-Packaged Ultra-Wide Band Bandpass Filter Using Integrated Substrate Gap Waveguide","authors":"Zhidong Ruan, Dongya Shen, Hong Yuan, Xiupu Zhang","doi":"10.1109/IEEE-IWS.2019.8804146","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2019.8804146","url":null,"abstract":"An ultra-wideband bandpass (UWB) filter using integrated substrate gap waveguide (ISGW) technology is proposed, which has ultra-wideband and high selectivity. The UWB ISGW bandpass filter structure consists of three layer dielectric substrates, the top substrate uses metallic via-holes and metallic patches to implement perfect magnetic conductor (PMC) structure, which is suitable for packaging substrate integrated waveguide (SIW) filters to avoid external interference and loss caused by radiation and internal radiation leakage, the middle layer substrate provides a stable gap layer, and the base substrate is used to obtain a SIW filter by etching the slots in the metal plane and placing metallic via-holes in the middle of the layer, i.e. a self-packaged UWB ISGW filter. The proposed filter was fabricated and tested at a center frequency of 17.5 GHz as an example. The measurements show that the filter has a passband from 14.4 to 20.7 GHz, i.e. This filter has a fractional bandwidth (FBW) of 36%, and an insertion loss of 0.91 dB. More importantly, thanks to ISGW, two transmission zeros are obtained at 12.9 and 22.1 GHz to improve high selectivity.","PeriodicalId":306297,"journal":{"name":"2019 IEEE MTT-S International Wireless Symposium (IWS)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124474946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-01DOI: 10.1109/IEEE-IWS.2019.8803985
Chang Liu, Hao Luo, Guoqiang Zhao, Houjun Sun
An omnidirectional circularly polarized (CP) antenna operating in W-band is proposed. The antenna has a simple structure, which consists of a dual-reflector antenna, an ortho-mode transducer (OMT) and a 3-dB coupler. The OMT adopts a novel septum-free structure, and can realize wideband, high isolation, and low loss. The results show that the dual-reflector antenna with this OMT has an impedance bandwidth from 91.1 to 96.8 GHz (the overlapped bandwidth limited by |S11| < -15dB, |S22|< -15dB) and a 3-dB axial-ratio bandwidth from 93.1 to 95.9 GHz. In addition, the omnidirectional CP radiation pattern can be obtained in the azimuth plane of θ = 40°- 80°.
{"title":"Design of a W-band Omnidirectional Circularly Polarized Antenna by Using OMT","authors":"Chang Liu, Hao Luo, Guoqiang Zhao, Houjun Sun","doi":"10.1109/IEEE-IWS.2019.8803985","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2019.8803985","url":null,"abstract":"An omnidirectional circularly polarized (CP) antenna operating in W-band is proposed. The antenna has a simple structure, which consists of a dual-reflector antenna, an ortho-mode transducer (OMT) and a 3-dB coupler. The OMT adopts a novel septum-free structure, and can realize wideband, high isolation, and low loss. The results show that the dual-reflector antenna with this OMT has an impedance bandwidth from 91.1 to 96.8 GHz (the overlapped bandwidth limited by |S11| < -15dB, |S22|< -15dB) and a 3-dB axial-ratio bandwidth from 93.1 to 95.9 GHz. In addition, the omnidirectional CP radiation pattern can be obtained in the azimuth plane of θ = 40°- 80°.","PeriodicalId":306297,"journal":{"name":"2019 IEEE MTT-S International Wireless Symposium (IWS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121761396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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