Pub Date : 2015-12-01DOI: 10.1109/APMC.2015.7413196
Sai‐Wai Wong, Shi-Fen Feng, Lei Zhu
A novel class of miniaturized multi-mode wideband bandpass filters (BPFs) is introduced this paper, includes four multiple-mode filters. Two of them are realized using metal cavity and two of them are realized using substrate integrated waveguide (SIW). These filters have significant advantages in size reduction which can reduce 2.5-4 times compared with traditional single-mode cavity filter. The fractional bandwidth of three filters achieves 30%, 31% and 42%, respectively. All three BPFs are analyzed and experimentally demonstrated. Comparisons of the measured and simulated results are presented and in good agreements with each other.
{"title":"Multi-mode wideband bandpass filters using waveguide cavities (invited)","authors":"Sai‐Wai Wong, Shi-Fen Feng, Lei Zhu","doi":"10.1109/APMC.2015.7413196","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413196","url":null,"abstract":"A novel class of miniaturized multi-mode wideband bandpass filters (BPFs) is introduced this paper, includes four multiple-mode filters. Two of them are realized using metal cavity and two of them are realized using substrate integrated waveguide (SIW). These filters have significant advantages in size reduction which can reduce 2.5-4 times compared with traditional single-mode cavity filter. The fractional bandwidth of three filters achieves 30%, 31% and 42%, respectively. All three BPFs are analyzed and experimentally demonstrated. Comparisons of the measured and simulated results are presented and in good agreements with each other.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125954386","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 : 2015-12-01DOI: 10.1109/APMC.2015.7413431
F. Meng, Xiaowei Zhu, Q. Jin, Yazhou Wang, X. Ruan
This paper presents a digitally-controlled highly efficient supply modulator. This supply modulator is implemented as a multilevel converter in series with a linear amplifier. The multilevel converter output which controlled by digital signals is employed to supply the linear amplifier. The digitally controlled strategy and the optimization of the supply levels can make the converter output to approach the linear output as much as possible. Thus, the supply modulator can obtain the optimum efficiency. This envelope tracking (ET) transmitter was demonstrated by a GaN high efficiency PA. When driven with a 5MHz OFDM signal with 8.5dB PAPR, the supply modulator tracks the signal well. The efficiency of the supply modulator can exceed 70% and the overall efficiency of ET transmitter can be above 40% with an adjacent channel power ratio of lower than -45dBc after using digital predistortion.
{"title":"Digitally-controlled high-efficiency series form switch-linear hybrid supply modulator for envelope tracking power amplifiers","authors":"F. Meng, Xiaowei Zhu, Q. Jin, Yazhou Wang, X. Ruan","doi":"10.1109/APMC.2015.7413431","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413431","url":null,"abstract":"This paper presents a digitally-controlled highly efficient supply modulator. This supply modulator is implemented as a multilevel converter in series with a linear amplifier. The multilevel converter output which controlled by digital signals is employed to supply the linear amplifier. The digitally controlled strategy and the optimization of the supply levels can make the converter output to approach the linear output as much as possible. Thus, the supply modulator can obtain the optimum efficiency. This envelope tracking (ET) transmitter was demonstrated by a GaN high efficiency PA. When driven with a 5MHz OFDM signal with 8.5dB PAPR, the supply modulator tracks the signal well. The efficiency of the supply modulator can exceed 70% and the overall efficiency of ET transmitter can be above 40% with an adjacent channel power ratio of lower than -45dBc after using digital predistortion.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126060169","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 : 2015-12-01DOI: 10.1109/APMC.2015.7413048
Yuan Yao, N. He, Wanzhong Chen, Junsheng Yu, Xiao-dong Chen
A novel optically transparent RFID reader antenna is proposed in this paper for smart fitting room application in clothing stores. This antenna uses Indium Tin Oxide film to achieve the optically transparent characteristic. It operates in the ultrahigh frequency (UHF) band and has circular polarization characteristic. The antenna can be integrated into the mirror surface of fitting rooms and read the tags attached to clothes being tried on. The interactive information of clothing can be automatically provided for the clients through this RFID system. Both of the simulation and measurement results are given to illustrate the good performance of the antenna. The measured tag detection distances are up to 1.5m along the front of the mirror and 0.5m at the sides which are suitable for the size of fitting rooms.
{"title":"Novel optically transparent antenna for RFID smart fitting room application","authors":"Yuan Yao, N. He, Wanzhong Chen, Junsheng Yu, Xiao-dong Chen","doi":"10.1109/APMC.2015.7413048","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413048","url":null,"abstract":"A novel optically transparent RFID reader antenna is proposed in this paper for smart fitting room application in clothing stores. This antenna uses Indium Tin Oxide film to achieve the optically transparent characteristic. It operates in the ultrahigh frequency (UHF) band and has circular polarization characteristic. The antenna can be integrated into the mirror surface of fitting rooms and read the tags attached to clothes being tried on. The interactive information of clothing can be automatically provided for the clients through this RFID system. Both of the simulation and measurement results are given to illustrate the good performance of the antenna. The measured tag detection distances are up to 1.5m along the front of the mirror and 0.5m at the sides which are suitable for the size of fitting rooms.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125352984","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 : 2015-12-01DOI: 10.1109/APMC.2015.7413469
S. Pamin, E. Chorlton, J. Hermsdorf, S. Kaierle
This paper discusses a new approach to the joining of Ku-band waveguides made of high-strength crack-sensitive aluminum alloys, Al6061 and Al6063. Using a pulsed Nd:YAG laser system in combination with a pulsed wire feed drive, rectangular waveguide segments are welded. The results clearly show the potential to employ welding as a substitute to conventional brazing and soldering processes: the electrical and mechanical performances are close to the ones of a milled waveguide. Furthermore, the presented welding process is completely automated.
{"title":"Joining of aluminum waveguides using pulsed laser radiation","authors":"S. Pamin, E. Chorlton, J. Hermsdorf, S. Kaierle","doi":"10.1109/APMC.2015.7413469","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413469","url":null,"abstract":"This paper discusses a new approach to the joining of Ku-band waveguides made of high-strength crack-sensitive aluminum alloys, Al6061 and Al6063. Using a pulsed Nd:YAG laser system in combination with a pulsed wire feed drive, rectangular waveguide segments are welded. The results clearly show the potential to employ welding as a substitute to conventional brazing and soldering processes: the electrical and mechanical performances are close to the ones of a milled waveguide. Furthermore, the presented welding process is completely automated.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125556460","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}
Substrate Integrated Waveguide (SIW) will play an important role in mass production of millimeter-wave systems due to the low-cost, mass-producible, compact characteristic and easy to integrate with other planar circuits. It is necessary to estimate the fabrication yield in mass production. However, yield analysis is an impracticable task for the full-wave simulation method due to large computational amount. This paper proposed an equivalent circuit perturbation method for rectangular SIW-cavity filters to achieve fast and accurate analysis of SIW filter with machining deviations. Based upon the Monte Carlo experiments, this method is applied to estimate the fabrication yield of a four square-cavity SIW filter at 28GHz. Moreover, measurements are carried out to obtain the actual performance of filters fabricated with standard PCB process.
{"title":"An equivalent circuit perturbation method for machining deviation and yield analysis of Substrate Integrated Waveguide filters","authors":"Binqi Yang, Jian-yi Zhou, Wen-qi Ding, Weichen Huang, Zhi-qiang Yu","doi":"10.1109/APMC.2015.7413538","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413538","url":null,"abstract":"Substrate Integrated Waveguide (SIW) will play an important role in mass production of millimeter-wave systems due to the low-cost, mass-producible, compact characteristic and easy to integrate with other planar circuits. It is necessary to estimate the fabrication yield in mass production. However, yield analysis is an impracticable task for the full-wave simulation method due to large computational amount. This paper proposed an equivalent circuit perturbation method for rectangular SIW-cavity filters to achieve fast and accurate analysis of SIW filter with machining deviations. Based upon the Monte Carlo experiments, this method is applied to estimate the fabrication yield of a four square-cavity SIW filter at 28GHz. Moreover, measurements are carried out to obtain the actual performance of filters fabricated with standard PCB process.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126951061","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 : 2015-12-01DOI: 10.1109/APMC.2015.7413573
Shou Chen, F. Wu, Junhong Wang
This paper presents a new broadband metal-only reflectarray antenna. The designed reflectarray antenna operating at 12.5 GHz doesn't contain any dielectric substrate by using a modified slot structure. The slot-type element is optimized to provide a linear phase curve and a phase-shift range in excess of 360 degrees is achieved. With an offset feed configuration, a 9×9 elements reflectarray antenna is designed and simulated. The simulation results show a maximum gain of 19.9 dB at 13.1 GHz with 13.6%, 1-dB gain bandwidth.
{"title":"Design of A broadband metal-only reflectarray antenna with modified slot-type elements","authors":"Shou Chen, F. Wu, Junhong Wang","doi":"10.1109/APMC.2015.7413573","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413573","url":null,"abstract":"This paper presents a new broadband metal-only reflectarray antenna. The designed reflectarray antenna operating at 12.5 GHz doesn't contain any dielectric substrate by using a modified slot structure. The slot-type element is optimized to provide a linear phase curve and a phase-shift range in excess of 360 degrees is achieved. With an offset feed configuration, a 9×9 elements reflectarray antenna is designed and simulated. The simulation results show a maximum gain of 19.9 dB at 13.1 GHz with 13.6%, 1-dB gain bandwidth.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"268 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115208945","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 : 2015-12-01DOI: 10.1109/APMC.2015.7413505
Zhi-Han Chen, Shi-Xuan Zhang, Q. Chu
A reconfigurable bandpass filter with compensable coupling and constant absolute bandwidth (ABW) is proposed. The fundamental structure is based on two coplanar waveguide (CPW) resonators and a microstrip-to-CPW transition. Four varactors embedded in the resonators and feed-lines are utilized to adjust center frequency and external coupling, separately. Moreover, this novel feeding structure generates an adjustable transmission zero (TZ) at lower stopband. For demonstration, a second-order filter is implemented with center frequency range of 1.87-2.37 GHz (i.e., 23.6% fractional tuning range) and a constant 3-dB ABW of 410±10 MHz. Specifically, the return loss of passband at each tuning state can achieve greater than 15 dB.
{"title":"A novel reconfigurable bandpass filter with compensable coupling based on microstrip-to-CPW structure","authors":"Zhi-Han Chen, Shi-Xuan Zhang, Q. Chu","doi":"10.1109/APMC.2015.7413505","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413505","url":null,"abstract":"A reconfigurable bandpass filter with compensable coupling and constant absolute bandwidth (ABW) is proposed. The fundamental structure is based on two coplanar waveguide (CPW) resonators and a microstrip-to-CPW transition. Four varactors embedded in the resonators and feed-lines are utilized to adjust center frequency and external coupling, separately. Moreover, this novel feeding structure generates an adjustable transmission zero (TZ) at lower stopband. For demonstration, a second-order filter is implemented with center frequency range of 1.87-2.37 GHz (i.e., 23.6% fractional tuning range) and a constant 3-dB ABW of 410±10 MHz. Specifically, the return loss of passband at each tuning state can achieve greater than 15 dB.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"233 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115995095","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 : 2015-12-01DOI: 10.1109/APMC.2015.7411581
Matthias Porranzl, C. Wagner, H. Jaeger, A. Stelzer
A modified structure of an active quasi-circulator (QC) is proposed for receive signal (RX) and transmit signal (TX) separation in 77-GHz monostatic FMCW radars. The circuit includes an impedance tuner, operating as leakage canceler, which performs compensation for process variations, parasitics of transistors as well as antenna mismatch. Additionally, the TX path is designed to be passive, to avoid any compression in the transmit signal. The QC is fabricated in a 200-GHz fT Silicon-Germanium (SiGe) HBT technology. On-wafer S-Parameter measurements show an isolation of 43 dB at 78 GHz. The insertion loss for the TX-path is around 7dB, whereas the gain in the RX-path is around 3 dB. Due to the tuner, the center frequency of the isolation can be varied from 67 GHz to 85 GHz.
{"title":"An active quasi-circulator with controllable leakage canceler and passive TX path for 77-GHz automotive FMCW radar systems in SiGe technology","authors":"Matthias Porranzl, C. Wagner, H. Jaeger, A. Stelzer","doi":"10.1109/APMC.2015.7411581","DOIUrl":"https://doi.org/10.1109/APMC.2015.7411581","url":null,"abstract":"A modified structure of an active quasi-circulator (QC) is proposed for receive signal (RX) and transmit signal (TX) separation in 77-GHz monostatic FMCW radars. The circuit includes an impedance tuner, operating as leakage canceler, which performs compensation for process variations, parasitics of transistors as well as antenna mismatch. Additionally, the TX path is designed to be passive, to avoid any compression in the transmit signal. The QC is fabricated in a 200-GHz fT Silicon-Germanium (SiGe) HBT technology. On-wafer S-Parameter measurements show an isolation of 43 dB at 78 GHz. The insertion loss for the TX-path is around 7dB, whereas the gain in the RX-path is around 3 dB. Due to the tuner, the center frequency of the isolation can be varied from 67 GHz to 85 GHz.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116150354","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 : 2015-12-01DOI: 10.1109/APMC.2015.7412971
Ping Wang, Bin Yu, Shuai Wang
A compact wideband filter based on combline structure in Substrate Integrated Waveguide (SIW) technology is presented in this paper. The combline structure contains a grounded post connected to a floating metallic disk and the disk is isolated from the top plate of the SIW cavity through an annular gap. This enables an important reduction of the resonate frequency (f0) of the resonator thus the filter's size is significantly reduced and the f0 can be tuned through the radius of the disk (r), the gap's with (wg). The coplanar waveguide line (CPWL) etched at the top of cavities is used to realize the direct coupling between cavities so we got a wideband filter. To achieve sharp skirt at the upper stopband, a couple of open stubs are used to obtain a transmission zero (Tz) located at the upper stopband and the location of the Tz can be changed through the length of the stubs. A four-pole Chebyshev filter has been designed, fabricated and measured. The fabricated device shows an excellent agreement with simulated results. These structures have the characteristics of compact, miniaturization, wideband and high stopband rejection.
{"title":"Design of compact wideband combline filters in Substrate Integrated Waveguide (SIW)","authors":"Ping Wang, Bin Yu, Shuai Wang","doi":"10.1109/APMC.2015.7412971","DOIUrl":"https://doi.org/10.1109/APMC.2015.7412971","url":null,"abstract":"A compact wideband filter based on combline structure in Substrate Integrated Waveguide (SIW) technology is presented in this paper. The combline structure contains a grounded post connected to a floating metallic disk and the disk is isolated from the top plate of the SIW cavity through an annular gap. This enables an important reduction of the resonate frequency (f0) of the resonator thus the filter's size is significantly reduced and the f0 can be tuned through the radius of the disk (r), the gap's with (wg). The coplanar waveguide line (CPWL) etched at the top of cavities is used to realize the direct coupling between cavities so we got a wideband filter. To achieve sharp skirt at the upper stopband, a couple of open stubs are used to obtain a transmission zero (Tz) located at the upper stopband and the location of the Tz can be changed through the length of the stubs. A four-pole Chebyshev filter has been designed, fabricated and measured. The fabricated device shows an excellent agreement with simulated results. These structures have the characteristics of compact, miniaturization, wideband and high stopband rejection.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122742942","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 : 2015-12-01DOI: 10.1109/APMC.2015.7413585
Hongmei Li, S. Sun, H. Zong
The EBG structure have special electromagnetic properties such as high surface impedance and suppression of propagating surface currents within a frequency band. Fractal structure has two special properties: space-filling property and self similarity property which may help the antenna have good performance. In this paper, a new PIFA with fractal EBG structure as its ground will be investigated. The proposed antenna has shown improvement over the conventional PIFA in directivity, gain and bandwidth. The investigation is based on RFID system and operated in UHF which is 920MHz to 925MHz in China. The simulation results were compared with the experiment results, it was discovered that their return loss agreed well with each other.
{"title":"Design of EBG with fractal structure on PIFA","authors":"Hongmei Li, S. Sun, H. Zong","doi":"10.1109/APMC.2015.7413585","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413585","url":null,"abstract":"The EBG structure have special electromagnetic properties such as high surface impedance and suppression of propagating surface currents within a frequency band. Fractal structure has two special properties: space-filling property and self similarity property which may help the antenna have good performance. In this paper, a new PIFA with fractal EBG structure as its ground will be investigated. The proposed antenna has shown improvement over the conventional PIFA in directivity, gain and bandwidth. The investigation is based on RFID system and operated in UHF which is 920MHz to 925MHz in China. The simulation results were compared with the experiment results, it was discovered that their return loss agreed well with each other.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114243138","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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