Pub Date : 2019-06-02DOI: 10.1109/mwsym.2019.8701002
Frida Strombeck, Z. He, H. Zirath
An Amplitude Modulated Continuous Wave (AMCW) radar system is proposed that uses both the phase from the envelope and carrier to achieve micrometer accuracy distance measurement. The system has the benefit of using only two frequencies instead of an entire frequency band which is the case with FMCW radars. Many radar systems can therefore be used in a small area without risking interference. An experimental radar setup at 78 GHz is measured and verified to have a measurement error magnitude of less than 10 micrometer. This system is suitable for modern manufacturing and industry.
{"title":"AMCW Radar of Micrometer Accuracy Distance Measurement and Monitoring","authors":"Frida Strombeck, Z. He, H. Zirath","doi":"10.1109/mwsym.2019.8701002","DOIUrl":"https://doi.org/10.1109/mwsym.2019.8701002","url":null,"abstract":"An Amplitude Modulated Continuous Wave (AMCW) radar system is proposed that uses both the phase from the envelope and carrier to achieve micrometer accuracy distance measurement. The system has the benefit of using only two frequencies instead of an entire frequency band which is the case with FMCW radars. Many radar systems can therefore be used in a small area without risking interference. An experimental radar setup at 78 GHz is measured and verified to have a measurement error magnitude of less than 10 micrometer. This system is suitable for modern manufacturing and industry.","PeriodicalId":6720,"journal":{"name":"2019 IEEE MTT-S International Microwave Symposium (IMS)","volume":"16 1","pages":"1473-1475"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76021673","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 : 2019-06-02DOI: 10.1109/mwsym.2019.8701092
J. Plouchart, X. Gu, Wooram Lee, A. Tzadok, Duixian Liu, Huijian Liu, M. Yeck, C. Baks, A. Valdes-Garcia
Compact phased array transmitter (TX) and receiver (RX) modules operating at 94 GHz are presented and demonstrated in a 3D radar imaging system. Each module consists of four SiGe ICs and a package that integrates 8X8 dual-polarized antennas and 10-GHz IF power combiners. Each TX and RX IC integrates beam-forming, frequency conversion, LO generation, and digital control functions. The modules have beam steering capabilities in both azimuth and elevation over a range of +/- 32 degrees. A radar imaging system is implemented comprising an evaluation board with one TX module and one RX module, FMCW signal generation and acquisition components, and an FPGA for fast beam steering control. The system can steer TX and RX beams to a given direction and perform a radar measurement in that direction in less than 100us, enabling 3D imaging in real time. Measurement results are presented for the modules and the prototype imaging system.
{"title":"Si-Based 94-GHz Phased Array Transmit and Receive Modules for Real-Time 3D Radar Imaging","authors":"J. Plouchart, X. Gu, Wooram Lee, A. Tzadok, Duixian Liu, Huijian Liu, M. Yeck, C. Baks, A. Valdes-Garcia","doi":"10.1109/mwsym.2019.8701092","DOIUrl":"https://doi.org/10.1109/mwsym.2019.8701092","url":null,"abstract":"Compact phased array transmitter (TX) and receiver (RX) modules operating at 94 GHz are presented and demonstrated in a 3D radar imaging system. Each module consists of four SiGe ICs and a package that integrates 8X8 dual-polarized antennas and 10-GHz IF power combiners. Each TX and RX IC integrates beam-forming, frequency conversion, LO generation, and digital control functions. The modules have beam steering capabilities in both azimuth and elevation over a range of +/- 32 degrees. A radar imaging system is implemented comprising an evaluation board with one TX module and one RX module, FMCW signal generation and acquisition components, and an FPGA for fast beam steering control. The system can steer TX and RX beams to a given direction and perform a radar measurement in that direction in less than 100us, enabling 3D imaging in real time. Measurement results are presented for the modules and the prototype imaging system.","PeriodicalId":6720,"journal":{"name":"2019 IEEE MTT-S International Microwave Symposium (IMS)","volume":"7 1","pages":"532-535"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74284490","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 : 2019-06-02DOI: 10.1109/mwsym.2019.8700856
Changkun Liu, Zhixian Deng, Xiaohui Liu, Xun Luo
In this paper, a wideband bandpass filter with the broad stopband and ultra-wide reflectionless range is proposed. Such filter consists of two parallel connected channels. The good in-band performance and broad stopband of the filter are achieved using the dumbbell-shaped defected ground structure (DGS) in the main channel. Meanwhile, the auxiliary channel with a bandstop filter (BSF) and a loaded resistor is introduced to obtain the ultra-wide reflectionless range. Besides, to further enhance the stopband performance of the filter, spur-lines are embedded in the I/O port of main channel. To verify the mechanisms mentioned above, a reflectionless filter operating at 3.1–5.3 GHz is proposed. The measured stopband is expanded to 27.4 GHz with an attenuation level higher than 30 dB. Moreover, the reflectionless range is from 10 MHz to 26 GHz, which is the state-of-the-art performance. With such good performance, the proposed filter shows strong merits for the 5G applications.
{"title":"A Wideband Bandpass Filter with Broad Stopband and Ultra-Wide Reflectionless Range for 5G Applications","authors":"Changkun Liu, Zhixian Deng, Xiaohui Liu, Xun Luo","doi":"10.1109/mwsym.2019.8700856","DOIUrl":"https://doi.org/10.1109/mwsym.2019.8700856","url":null,"abstract":"In this paper, a wideband bandpass filter with the broad stopband and ultra-wide reflectionless range is proposed. Such filter consists of two parallel connected channels. The good in-band performance and broad stopband of the filter are achieved using the dumbbell-shaped defected ground structure (DGS) in the main channel. Meanwhile, the auxiliary channel with a bandstop filter (BSF) and a loaded resistor is introduced to obtain the ultra-wide reflectionless range. Besides, to further enhance the stopband performance of the filter, spur-lines are embedded in the I/O port of main channel. To verify the mechanisms mentioned above, a reflectionless filter operating at 3.1–5.3 GHz is proposed. The measured stopband is expanded to 27.4 GHz with an attenuation level higher than 30 dB. Moreover, the reflectionless range is from 10 MHz to 26 GHz, which is the state-of-the-art performance. With such good performance, the proposed filter shows strong merits for the 5G applications.","PeriodicalId":6720,"journal":{"name":"2019 IEEE MTT-S International Microwave Symposium (IMS)","volume":"38 1","pages":"834-837"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86263236","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 : 2019-06-02DOI: 10.1109/mwsym.2019.8700743
B. Mamandipoor, Upamanyu Madhow, A. Arbabian
In this paper, we develop a systematic framework for two-dimensional mm-wave imaging, based on the singular value decomposition (SVD) of the Helmholtz wave equation under the Born approximation. We identify the degrees of freedom as a function of the geometry of the aperture and the scene, and provide insight into the eigenmodes identified by the SVD. For sparse arrays with number of elements smaller than the degrees of freedom, we propose, and experimentally demonstrate the efficacy of, an eigen-filtered pseudo-inverse algorithm which selects the eigenmodes being imaged.
{"title":"2D mm-wave imaging based on singular value decomposition","authors":"B. Mamandipoor, Upamanyu Madhow, A. Arbabian","doi":"10.1109/mwsym.2019.8700743","DOIUrl":"https://doi.org/10.1109/mwsym.2019.8700743","url":null,"abstract":"In this paper, we develop a systematic framework for two-dimensional mm-wave imaging, based on the singular value decomposition (SVD) of the Helmholtz wave equation under the Born approximation. We identify the degrees of freedom as a function of the geometry of the aperture and the scene, and provide insight into the eigenmodes identified by the SVD. For sparse arrays with number of elements smaller than the degrees of freedom, we propose, and experimentally demonstrate the efficacy of, an eigen-filtered pseudo-inverse algorithm which selects the eigenmodes being imaged.","PeriodicalId":6720,"journal":{"name":"2019 IEEE MTT-S International Microwave Symposium (IMS)","volume":"23 1","pages":"536-539"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80913272","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 : 2019-06-02DOI: 10.1109/mwsym.2019.8701047
A. Ferchichi, S. Rehman, C. Carta, F. Ellinger
This paper presents a 60-GHz on-off keying (OOK) demodulator suited for high-speed applications. A highly efficient envelope detector (ED) and a novel limiting amplifier (LA) architecture with high bandwidth and high gain are used to ensure high-speed low-power operation. To avoid degrading the demodulator performances and simultaneously not affect the stability, a feedforward dc-offset cancellation technique is implemented in the LA. Integrated in a 0.13-µm SiGe BiCMOS technology, the demodulator occupies an active footprint of only 0.035 mm2 and consumes 11 mW. The OOK demodulator achieves a data-rate (DR) of 22 Gb/s at a bit-error rate (BER) of less than 10-12, which is – to the authors’ best knowledge – the highest reported DR (for 60-GHz OOK demodulators). This corresponds to an energy efficiency of only 0.5 pJ/bit. At 22 Gb/s, the input sensitivity is -17.4 dBm.
{"title":"22-Gb/s 60-GHz OOK Demodulator in 0.13-µm SiGe BiCMOS for Ultra-High-Speed Wireless Communication","authors":"A. Ferchichi, S. Rehman, C. Carta, F. Ellinger","doi":"10.1109/mwsym.2019.8701047","DOIUrl":"https://doi.org/10.1109/mwsym.2019.8701047","url":null,"abstract":"This paper presents a 60-GHz on-off keying (OOK) demodulator suited for high-speed applications. A highly efficient envelope detector (ED) and a novel limiting amplifier (LA) architecture with high bandwidth and high gain are used to ensure high-speed low-power operation. To avoid degrading the demodulator performances and simultaneously not affect the stability, a feedforward dc-offset cancellation technique is implemented in the LA. Integrated in a 0.13-µm SiGe BiCMOS technology, the demodulator occupies an active footprint of only 0.035 mm2 and consumes 11 mW. The OOK demodulator achieves a data-rate (DR) of 22 Gb/s at a bit-error rate (BER) of less than 10-12, which is – to the authors’ best knowledge – the highest reported DR (for 60-GHz OOK demodulators). This corresponds to an energy efficiency of only 0.5 pJ/bit. At 22 Gb/s, the input sensitivity is -17.4 dBm.","PeriodicalId":6720,"journal":{"name":"2019 IEEE MTT-S International Microwave Symposium (IMS)","volume":"28 1","pages":"247-250"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80841488","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 : 2019-06-02DOI: 10.1109/mwsym.2019.8700784
A. Nefzi, Lynn Carr, C. Dalmay, A. Pothier, P. Lévêque, D. Arnaud-Cormos
Exposing living cells to a certain level of Electromagnetic Field (EMF) might induce some biological effects including temperature elevation. In this paper, we show the dosimetry of exposure systems such as an Open Transverse Electro-Magnetic (TEM) cell allowing the study of the effect of EMF on biological samples exposed to 1.8 GHz signals. Temperature measurements are carried out with a fluorooptic probe to extract specific absorption rate (SAR) values that are compared to numerical dosimetry, based on a FDTD method. To investigate dosimetry at a microscopic level the fluorescence of the temperature dependent dye Rhodamine B was measured with fluorescence microscopy. The results are confirmed by measurements and simulations with a SAR of 13.9 and 11.8 W/kg for 1 W incident power, respectively. Results evidence that the objective working distance of the microscope strongly influence SAR values. After calibration, the fluorescence fits well with the temperature variation measured by the probe.
{"title":"Rhodamine B Temperature Dosimetry of Biological Samples Interacting with Electromagnetic Fields in Macrosystems","authors":"A. Nefzi, Lynn Carr, C. Dalmay, A. Pothier, P. Lévêque, D. Arnaud-Cormos","doi":"10.1109/mwsym.2019.8700784","DOIUrl":"https://doi.org/10.1109/mwsym.2019.8700784","url":null,"abstract":"Exposing living cells to a certain level of Electromagnetic Field (EMF) might induce some biological effects including temperature elevation. In this paper, we show the dosimetry of exposure systems such as an Open Transverse Electro-Magnetic (TEM) cell allowing the study of the effect of EMF on biological samples exposed to 1.8 GHz signals. Temperature measurements are carried out with a fluorooptic probe to extract specific absorption rate (SAR) values that are compared to numerical dosimetry, based on a FDTD method. To investigate dosimetry at a microscopic level the fluorescence of the temperature dependent dye Rhodamine B was measured with fluorescence microscopy. The results are confirmed by measurements and simulations with a SAR of 13.9 and 11.8 W/kg for 1 W incident power, respectively. Results evidence that the objective working distance of the microscope strongly influence SAR values. After calibration, the fluorescence fits well with the temperature variation measured by the probe.","PeriodicalId":6720,"journal":{"name":"2019 IEEE MTT-S International Microwave Symposium (IMS)","volume":"21 1","pages":"1454-1457"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77769604","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 : 2019-06-02DOI: 10.1109/mwsym.2019.8700736
William Sear, T. Barton
This work presents a power amplifier (PA) linearization approach based on baseband feedback. The modulated signal envelope is fed back from the transistor’s drain to its gate with an applied amplitude and phase shift selected to reduce the intermodulation distortion (IMD3) product at the output. The design targets IMD3 improvement near the PA’s 1-dB compression point (P1dB), enabling linear operation at a higher output power level and therefore improved device periphery utilization and efficiency. This approach offers a potential linearization alternative to digital pre-distortion, which cannot be applied in some systems, without affecting the RF performance. The 850-MHz proof-of-concept prototype based on a 15-W GaN device is characterized with a two-tone measurement with 5-MHz spacing, and demonstrates 9-dB improvement of the lower IMD3 tone near the P1dB point.
{"title":"A Baseband Feedback Approach to Linearization of a UHF Power Amplifier","authors":"William Sear, T. Barton","doi":"10.1109/mwsym.2019.8700736","DOIUrl":"https://doi.org/10.1109/mwsym.2019.8700736","url":null,"abstract":"This work presents a power amplifier (PA) linearization approach based on baseband feedback. The modulated signal envelope is fed back from the transistor’s drain to its gate with an applied amplitude and phase shift selected to reduce the intermodulation distortion (IMD3) product at the output. The design targets IMD3 improvement near the PA’s 1-dB compression point (P1dB), enabling linear operation at a higher output power level and therefore improved device periphery utilization and efficiency. This approach offers a potential linearization alternative to digital pre-distortion, which cannot be applied in some systems, without affecting the RF performance. The 850-MHz proof-of-concept prototype based on a 15-W GaN device is characterized with a two-tone measurement with 5-MHz spacing, and demonstrates 9-dB improvement of the lower IMD3 tone near the P1dB point.","PeriodicalId":6720,"journal":{"name":"2019 IEEE MTT-S International Microwave Symposium (IMS)","volume":"2677 1","pages":"75-78"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87417019","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 : 2019-06-02DOI: 10.1109/mwsym.2019.8700879
Tae‐Hak Lee, J. Laurin, K. Wu
In this paper, we devise and develop a simple and low-cost method to tune the resonant frequency of a substrate integrated waveguide (SIW) resonator. A capacitance-loaded coaxial resonator is designed and then a circularly shaped high-permeability foil is attached so to control the air-gap thickness generated inside the resonator. A small and commercially available magnet is subsequently used to induce a magnetic flux to the foil and it results in a continuous resonant frequency tuning from 1.39 GHz to 3.73 GHz. Detailed fabrication and measurement process are given in this paper.
{"title":"A Wideband Frequency-Tuning Method Using Magnetically Actuated Mechanical Tuning of a SIW Resonator","authors":"Tae‐Hak Lee, J. Laurin, K. Wu","doi":"10.1109/mwsym.2019.8700879","DOIUrl":"https://doi.org/10.1109/mwsym.2019.8700879","url":null,"abstract":"In this paper, we devise and develop a simple and low-cost method to tune the resonant frequency of a substrate integrated waveguide (SIW) resonator. A capacitance-loaded coaxial resonator is designed and then a circularly shaped high-permeability foil is attached so to control the air-gap thickness generated inside the resonator. A small and commercially available magnet is subsequently used to induce a magnetic flux to the foil and it results in a continuous resonant frequency tuning from 1.39 GHz to 3.73 GHz. Detailed fabrication and measurement process are given in this paper.","PeriodicalId":6720,"journal":{"name":"2019 IEEE MTT-S International Microwave Symposium (IMS)","volume":"218 1","pages":"192-195"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90749882","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 : 2019-06-02DOI: 10.1109/mwsym.2019.8701091
Jin Li, Cheng Guo, Yang Yu, Guan-long Huang, Tao Yuan, Yi Wang, Jun Xu, A. Zhang
This paper reports on a new class of broadband fully 3-D printed E-plane rectangular-coax-to-waveguide transition. This type of transition is adopted to interconnect two E-plane rectangular waveguides, and is based on a full air-filled waveguide structure without introducing other types of transmission lines (TLs). It exhibits little dielectric loss and dispersion, and furthermore a potentially enhanced power handling capability. The transition is constructed by a section of air-filled rectangular coaxial TL cascaded in series to a broadband coax-to-waveguide probe transition. A proof-of-concept X-band back-to-back transition is designed and prototyped monolithically by incorporating stereolithography-based 3-D printing and copper electroplating techniques. The RF-measured result demonstrates a broadband and low-loss characteristic of the transition—an insertion loss of averagely 0.5 dB and a return loss of mostly better than 15 dB at the entire X band.
{"title":"A Full X-Band Fully 3-D Printed E-Plane Rectangular-Coax-to-Waveguide Transition","authors":"Jin Li, Cheng Guo, Yang Yu, Guan-long Huang, Tao Yuan, Yi Wang, Jun Xu, A. Zhang","doi":"10.1109/mwsym.2019.8701091","DOIUrl":"https://doi.org/10.1109/mwsym.2019.8701091","url":null,"abstract":"This paper reports on a new class of broadband fully 3-D printed E-plane rectangular-coax-to-waveguide transition. This type of transition is adopted to interconnect two E-plane rectangular waveguides, and is based on a full air-filled waveguide structure without introducing other types of transmission lines (TLs). It exhibits little dielectric loss and dispersion, and furthermore a potentially enhanced power handling capability. The transition is constructed by a section of air-filled rectangular coaxial TL cascaded in series to a broadband coax-to-waveguide probe transition. A proof-of-concept X-band back-to-back transition is designed and prototyped monolithically by incorporating stereolithography-based 3-D printing and copper electroplating techniques. The RF-measured result demonstrates a broadband and low-loss characteristic of the transition—an insertion loss of averagely 0.5 dB and a return loss of mostly better than 15 dB at the entire X band.","PeriodicalId":6720,"journal":{"name":"2019 IEEE MTT-S International Microwave Symposium (IMS)","volume":"9 1","pages":"1209-1212"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75232586","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 : 2019-06-02DOI: 10.1109/mwsym.2019.8701053
Amir Afshani, K. Wu
In this work, we have proposed and developed a special non-reciprocal waveguide in which forward and reverse directed waves propagate in different paths, like a two-way road that traffic in each road flows only in one direction. This waveguide structure is made possible thanks to the use of a substrate integrated waveguide loaded with anti-symmetrically biased twin-ferrite slabs. Further, this structure has been exploited to design a compact, fully integrated, non-reciprocal mode converting waveguide device, which converts the TE10 mode into TE20 mode only in one direction while in the reverse direction the mode is preserved all along the propagation. Finally, a new type of circulator that operates on the basis of the proposed nonreciprocal mode conversion mechanism has been designed, fabricated and measured to validate and highlight the whole theoretical foundation of this work.
{"title":"Non-Reciprocal Mode Converting Substrate Integrated Waveguide with Unsymmetrical Perturbation","authors":"Amir Afshani, K. Wu","doi":"10.1109/mwsym.2019.8701053","DOIUrl":"https://doi.org/10.1109/mwsym.2019.8701053","url":null,"abstract":"In this work, we have proposed and developed a special non-reciprocal waveguide in which forward and reverse directed waves propagate in different paths, like a two-way road that traffic in each road flows only in one direction. This waveguide structure is made possible thanks to the use of a substrate integrated waveguide loaded with anti-symmetrically biased twin-ferrite slabs. Further, this structure has been exploited to design a compact, fully integrated, non-reciprocal mode converting waveguide device, which converts the TE10 mode into TE20 mode only in one direction while in the reverse direction the mode is preserved all along the propagation. Finally, a new type of circulator that operates on the basis of the proposed nonreciprocal mode conversion mechanism has been designed, fabricated and measured to validate and highlight the whole theoretical foundation of this work.","PeriodicalId":6720,"journal":{"name":"2019 IEEE MTT-S International Microwave Symposium (IMS)","volume":"59 1","pages":"861-864"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75306743","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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