Pub Date : 2021-11-28DOI: 10.1109/iwem53379.2021.9790497
Yifan Yu, Zheng Dong, Q. Xue
Through such essay, we proposed the compact dual-polarized antenna with broadband in base station using a partially reflective surface (PRS). Multiple resonant patches of different shapes are placed side by side in one plane while one is coupling to another. In this way, a broad impedance bandwidth can be acquired, and at the same time, the structure also maintains a compact size. To better the impedance matching further more and lower the operation frequency band, a PRS is placed above the antenna substrate. Owing to the novel multi-radiator coupling structure and PRS, three resonances are simultaneously excited within the band, producing a wide bandwidth from 1.45-2.73GHz (|S11|＜-14dB). To validate the proposed ideas, a multi-radiator antenna is invented and the results are given.
{"title":"Compact Stable-gain Dual-polarized Base Station Antenna with Broadband using PRS","authors":"Yifan Yu, Zheng Dong, Q. Xue","doi":"10.1109/iwem53379.2021.9790497","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790497","url":null,"abstract":"Through such essay, we proposed the compact dual-polarized antenna with broadband in base station using a partially reflective surface (PRS). Multiple resonant patches of different shapes are placed side by side in one plane while one is coupling to another. In this way, a broad impedance bandwidth can be acquired, and at the same time, the structure also maintains a compact size. To better the impedance matching further more and lower the operation frequency band, a PRS is placed above the antenna substrate. Owing to the novel multi-radiator coupling structure and PRS, three resonances are simultaneously excited within the band, producing a wide bandwidth from 1.45-2.73GHz (|S11|＜-14dB). To validate the proposed ideas, a multi-radiator antenna is invented and the results are given.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116841998","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 : 2021-11-28DOI: 10.1109/iwem53379.2021.9790441
Fei Teng, Jixiang Wan, J. Liu
This paper presents a 118 GHz tanh-linear profile corrugated feedhorn with high Gaussian coupling efficiency and ultra-low sidelobes for quasi-optical systems. By optimizing the amplitude and phase of the HE11, HE12 and HE13 modes at the aperture of the feedhorn, we have acquired high beam symmetry, low sidelobe levels about −43 dB and 99.47% coupling to the fundamental Gaussian mode in the CHAMP simulation. A comparative analysis of linear, sin2-parallel and tanh-linear profile corrugated feedhorns has been done, which shows the tanh-linear profile feedhorn has the best performance of the three.
{"title":"Design of a 118 GHz Corrugated Horn Based on the Modal Analysis","authors":"Fei Teng, Jixiang Wan, J. Liu","doi":"10.1109/iwem53379.2021.9790441","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790441","url":null,"abstract":"This paper presents a 118 GHz tanh-linear profile corrugated feedhorn with high Gaussian coupling efficiency and ultra-low sidelobes for quasi-optical systems. By optimizing the amplitude and phase of the HE11, HE12 and HE13 modes at the aperture of the feedhorn, we have acquired high beam symmetry, low sidelobe levels about −43 dB and 99.47% coupling to the fundamental Gaussian mode in the CHAMP simulation. A comparative analysis of linear, sin2-parallel and tanh-linear profile corrugated feedhorns has been done, which shows the tanh-linear profile feedhorn has the best performance of the three.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117329057","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}
This paper proposes a new varactor-based compensation method to reduce the phase distortion of the envelope tracking (ET) power amplifier (PA). Differing from the conventional method where the phase compensation network (PCN) is designed separately from the PA, the proposed method integrates the PCN into the PA input matching network, thus easing the phase compensation and avoiding the trade-off in the gain performance. Moreover, this method also reduces the cost and complexity associated with the PCN control signal generation. For verification, the proposed method is applied to a 3.5 GHz GaN PA. The simulation results reveal that, when employing the proposed method and being excited by a 10 MHz LTE signal, the ET PA can provide a good average efficiency of 55% while maintaining excellent linearity of EVM < 2 % and ACLR < -45 dBc.
{"title":"A Linear Envelope Tracking Power Amplifier with Varactor-based Phase Compensation Network","authors":"Jie Shi, Xiaohu Fang, Jiangwei Sui, Xinyue Zhou, Hao Yu, Hongyu Yu","doi":"10.1109/iwem53379.2021.9790498","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790498","url":null,"abstract":"This paper proposes a new varactor-based compensation method to reduce the phase distortion of the envelope tracking (ET) power amplifier (PA). Differing from the conventional method where the phase compensation network (PCN) is designed separately from the PA, the proposed method integrates the PCN into the PA input matching network, thus easing the phase compensation and avoiding the trade-off in the gain performance. Moreover, this method also reduces the cost and complexity associated with the PCN control signal generation. For verification, the proposed method is applied to a 3.5 GHz GaN PA. The simulation results reveal that, when employing the proposed method and being excited by a 10 MHz LTE signal, the ET PA can provide a good average efficiency of 55% while maintaining excellent linearity of EVM < 2 % and ACLR < -45 dBc.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"125 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129711695","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 : 2021-11-28DOI: 10.1109/iwem53379.2021.9790432
Meilin Wu, Yan Qu, Jia Guo, Shichang Chen, Jialin Cai
In this work, a first-pass wideband Doherty power amplifier (DPA) has been designed using Wolfspeed's 10W GaN transistors. The entire design process is described. A combined network structure was designed with high and low impedance matching techniques, and the DPA is designer with a blocked optimization of the EM simulation. The fabricated DPA achieves a saturation output power up to 44.6 dBm in the 2.0-2.4 GHz frequency range, with a saturation drain efficiency (DE) over 53% and a 6 dB output power back-off (OBO) efficiency of more than 42%, which verifies the effectiveness of the first-pass broadband DPA design method.
{"title":"First-Pass Design of Broadband Doherty Power Amplifier","authors":"Meilin Wu, Yan Qu, Jia Guo, Shichang Chen, Jialin Cai","doi":"10.1109/iwem53379.2021.9790432","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790432","url":null,"abstract":"In this work, a first-pass wideband Doherty power amplifier (DPA) has been designed using Wolfspeed's 10W GaN transistors. The entire design process is described. A combined network structure was designed with high and low impedance matching techniques, and the DPA is designer with a blocked optimization of the EM simulation. The fabricated DPA achieves a saturation output power up to 44.6 dBm in the 2.0-2.4 GHz frequency range, with a saturation drain efficiency (DE) over 53% and a 6 dB output power back-off (OBO) efficiency of more than 42%, which verifies the effectiveness of the first-pass broadband DPA design method.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"volume1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128750996","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 : 2021-11-28DOI: 10.1109/iWEM53379.2021.9790669
Zhengxing Zuo, Shufeng Sun
An X-band low-noise amplifier based on a 0.25µm E-mode pHEMT process for the receiver side of a multifunctional chip is presented. Both stages of the amplifier are dual-supply powered with +3 V drain and +0.7 V gate operation, and the first stage uses minimum noise matching while the second stage uses RLC negative feedback to improve the overall gain flatness of the amplifier. The performance of the X-band LNA in the 8-12Ghz range are as follows: NF>1.5 dB; S21>19 dB, gain flatness less than 0.5 dB; VSWR1<1.9, VSWR2<1.6; the chip size is 1.75mmX0.8mm, meeting the compact requirements of the MFC for the cell circuit.
{"title":"Compact X-band MMIC LNA for MFC's receiver unit","authors":"Zhengxing Zuo, Shufeng Sun","doi":"10.1109/iWEM53379.2021.9790669","DOIUrl":"https://doi.org/10.1109/iWEM53379.2021.9790669","url":null,"abstract":"An X-band low-noise amplifier based on a 0.25µm E-mode pHEMT process for the receiver side of a multifunctional chip is presented. Both stages of the amplifier are dual-supply powered with +3 V drain and +0.7 V gate operation, and the first stage uses minimum noise matching while the second stage uses RLC negative feedback to improve the overall gain flatness of the amplifier. The performance of the X-band LNA in the 8-12Ghz range are as follows: NF>1.5 dB; S21>19 dB, gain flatness less than 0.5 dB; VSWR1<1.9, VSWR2<1.6; the chip size is 1.75mmX0.8mm, meeting the compact requirements of the MFC for the cell circuit.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130420830","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 : 2021-11-28DOI: 10.1109/iwem53379.2021.9790410
Fang Shen, Cheng Wang
An affordable, miniaturized time standard with "atomic clock" grade stability is in an urgent need for numerous applications. For instance, the 5G wireless infrastructure demands precise timing synchronization for massive Multi-Input-Multi-Ouput (MIMO) antennas. In addition, high performance clocks in micro-positioning, navigation and timing (µPNT) devices under GPS denied environment are experiencing a rapid growth. This paper reviews the development of chip scale molecular clocks (CSMC), which is a new timebase employing rotational spectra in sub-terahertz region of polar gaseous molecules for frequency servo-stabilization. CSMC is a promising alternative of chip-scale atomic clocks (CSAC) and miniaturized atomic clocks (MAC) for massive deployment.
{"title":"Chip-Scale Molecular Clocks: Evolvement Towards Widely Deployable \"Atomic Clock\" Grade Time Standards","authors":"Fang Shen, Cheng Wang","doi":"10.1109/iwem53379.2021.9790410","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790410","url":null,"abstract":"An affordable, miniaturized time standard with \"atomic clock\" grade stability is in an urgent need for numerous applications. For instance, the 5G wireless infrastructure demands precise timing synchronization for massive Multi-Input-Multi-Ouput (MIMO) antennas. In addition, high performance clocks in micro-positioning, navigation and timing (µPNT) devices under GPS denied environment are experiencing a rapid growth. This paper reviews the development of chip scale molecular clocks (CSMC), which is a new timebase employing rotational spectra in sub-terahertz region of polar gaseous molecules for frequency servo-stabilization. CSMC is a promising alternative of chip-scale atomic clocks (CSAC) and miniaturized atomic clocks (MAC) for massive deployment.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123222567","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 : 2021-11-28DOI: 10.1109/iwem53379.2021.9790361
Yu Quan, Hao Wang, S. Tao
A wideband butler matrix (BM) is designed based on ridge gap waveguides (RGWGW). The BM consists of several directional couplers, crossovers and phase shifters. The simulated S11/22 is below -10 dB from 25.6 to 33 GHz with a bandwidth of around 25.3%. Meanwhile, the isolation level is above 10 dB in the working band. Besides, the phase errors are within ± 10°. Each output port of the BM is terminated with two parallel dipoles with different length as the radiation element. This multibeam antenna has a stable radiation pattern. The maximum gain achieved for Port 1 and Port 2 are 13.71 dBi and 12.69 dBi respectively.
{"title":"A Wideband Butler Matrix Based on Ridge Gap Waveguides for mmW Applications","authors":"Yu Quan, Hao Wang, S. Tao","doi":"10.1109/iwem53379.2021.9790361","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790361","url":null,"abstract":"A wideband butler matrix (BM) is designed based on ridge gap waveguides (RGWGW). The BM consists of several directional couplers, crossovers and phase shifters. The simulated S11/22 is below -10 dB from 25.6 to 33 GHz with a bandwidth of around 25.3%. Meanwhile, the isolation level is above 10 dB in the working band. Besides, the phase errors are within ± 10°. Each output port of the BM is terminated with two parallel dipoles with different length as the radiation element. This multibeam antenna has a stable radiation pattern. The maximum gain achieved for Port 1 and Port 2 are 13.71 dBi and 12.69 dBi respectively.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123517586","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 : 2021-11-28DOI: 10.1109/iWEM53379.2021.9790616
Haobo Yuan, Lanpu Lu, Xinwei Chen, Jungang Ren
This paper introduces a novel phase retrieval method to handle the magnitude of the field in the phaseless planar near-field antenna measurement. The field is expressed in terms of the planar wave spectrum, and then converted into a quadratic programming problem, which is solved by the truncated amplitude flow (TAF) algorithm to restore the phase of the field. A virtual example shows that the proposed method is more stable and converges much faster than the commonly used Gerchberg-Saxton method.
{"title":"Phaseless Planar Near-Field Antenna Measurement Based on Truncated Amplitude Flow Algorithm","authors":"Haobo Yuan, Lanpu Lu, Xinwei Chen, Jungang Ren","doi":"10.1109/iWEM53379.2021.9790616","DOIUrl":"https://doi.org/10.1109/iWEM53379.2021.9790616","url":null,"abstract":"This paper introduces a novel phase retrieval method to handle the magnitude of the field in the phaseless planar near-field antenna measurement. The field is expressed in terms of the planar wave spectrum, and then converted into a quadratic programming problem, which is solved by the truncated amplitude flow (TAF) algorithm to restore the phase of the field. A virtual example shows that the proposed method is more stable and converges much faster than the commonly used Gerchberg-Saxton method.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121296173","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 : 2021-11-28DOI: 10.1109/iwem53379.2021.9790656
S. Zhu
High gain terahertz (THz) antennas working at 1 THz frequency is important for future terabit-per-second 6G communications systems. In this work, we propose a silicon (Si)-based THz metasurface antenna with high gain over 30 dBi. The Si dielectric resonator antenna is used as pixel element for the metasurface lens antenna and the Si THz antenna is fabricated by photolithography and deep reactive ion etching technology with Bosch process. The simulation and measurement results show that our proposed Si THz metasurface antenna can be realized with high gain and low-profile at 1 THz.
{"title":"Silicon-based High Gain Terahertz Metasurface Antennas working at 1 THz","authors":"S. Zhu","doi":"10.1109/iwem53379.2021.9790656","DOIUrl":"https://doi.org/10.1109/iwem53379.2021.9790656","url":null,"abstract":"High gain terahertz (THz) antennas working at 1 THz frequency is important for future terabit-per-second 6G communications systems. In this work, we propose a silicon (Si)-based THz metasurface antenna with high gain over 30 dBi. The Si dielectric resonator antenna is used as pixel element for the metasurface lens antenna and the Si THz antenna is fabricated by photolithography and deep reactive ion etching technology with Bosch process. The simulation and measurement results show that our proposed Si THz metasurface antenna can be realized with high gain and low-profile at 1 THz.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114780318","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 : 2021-11-28DOI: 10.1109/iWEM53379.2021.9790665
Qianwen Chen, Xiong Chen, Menghan Sun, Ming Yu
With the rapid development of the modern wireless communication technology, the coexistence issue become serious. This work proposes and demonstrates an empirical model to evaluate the nonlinear effect induced coexistence loss (ACLR) in multiple spectrum circumstance in wireless local area network (WLAN). The simulation takes the amplitude modulation mode as demo, the nonlinear distortion effect induced ACLR is evaluated and simulated under different noise configurations.
{"title":"Simulation of ACLR in Wideband Communication System by Passive Nonlinear Distortion Effect","authors":"Qianwen Chen, Xiong Chen, Menghan Sun, Ming Yu","doi":"10.1109/iWEM53379.2021.9790665","DOIUrl":"https://doi.org/10.1109/iWEM53379.2021.9790665","url":null,"abstract":"With the rapid development of the modern wireless communication technology, the coexistence issue become serious. This work proposes and demonstrates an empirical model to evaluate the nonlinear effect induced coexistence loss (ACLR) in multiple spectrum circumstance in wireless local area network (WLAN). The simulation takes the amplitude modulation mode as demo, the nonlinear distortion effect induced ACLR is evaluated and simulated under different noise configurations.","PeriodicalId":141204,"journal":{"name":"2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"224 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124444471","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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