Pub Date : 2006-12-01DOI: 10.1109/APMC.2006.4429786
H. Chu, E. Li, E. Liu, J. Dubard
The coupled computational intelligence, in term of genetic algorithms and artificial neural networks, with the time-domain solver for design of the microwave devices is presented in this paper, where the coupled genetic algorithms with the time-domain solver is used for optimization and the artificial neural networks is used to surrogate the time-domain solver in design of the microwave components. This microstrip patch antenna and the microstrip meander line filter are used for evaluation of the performance of computational intelligence in design microwave devices.
{"title":"Coupled computational intelligence and time-domain method for design of the microwave devices","authors":"H. Chu, E. Li, E. Liu, J. Dubard","doi":"10.1109/APMC.2006.4429786","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429786","url":null,"abstract":"The coupled computational intelligence, in term of genetic algorithms and artificial neural networks, with the time-domain solver for design of the microwave devices is presented in this paper, where the coupled genetic algorithms with the time-domain solver is used for optimization and the artificial neural networks is used to surrogate the time-domain solver in design of the microwave components. This microstrip patch antenna and the microstrip meander line filter are used for evaluation of the performance of computational intelligence in design microwave devices.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124279896","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429395
Y. Kim, Jeonghu Han, Dongho Lee, Changkun Park, Songcheol Hong
A CMOS power amplifier for an RFID reader, which is implemented in a 0.18 mum CMOS process, is designed on a system IC, including output matching circuits. The developed amplifier has an efficiency of 27 % at 900 MHz and an output power of 24 dBm with a supply voltage of 1.8 V. In addition, it is isolated with shielding metal lines and is ESD protected. Furthermore, it is robust to high supply voltages and load impedance variations.
在系统集成电路上设计了一种用于RFID读写器的CMOS功率放大器，该放大器采用0.18 μ m CMOS工艺实现，包括输出匹配电路。所开发的放大器在900 MHz时效率为27%，在1.8 V电源电压下输出功率为24 dBm。此外，它与屏蔽金属线隔离，并具有ESD保护。此外，它对高电源电压和负载阻抗变化具有鲁棒性。
{"title":"A CMOS power amplifier for a UHF RFID reader","authors":"Y. Kim, Jeonghu Han, Dongho Lee, Changkun Park, Songcheol Hong","doi":"10.1109/APMC.2006.4429395","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429395","url":null,"abstract":"A CMOS power amplifier for an RFID reader, which is implemented in a 0.18 mum CMOS process, is designed on a system IC, including output matching circuits. The developed amplifier has an efficiency of 27 % at 900 MHz and an output power of 24 dBm with a supply voltage of 1.8 V. In addition, it is isolated with shielding metal lines and is ESD protected. Furthermore, it is robust to high supply voltages and load impedance variations.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114331498","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429389
Xianbin Yu, Xiaoping Zheng, Hanyi Zhang
A tunable and configurable photonic microwave bandpass filter with negative coefficient is proposed and demonstrated. Based on all-optical mixing in an intensity modulator and a phase modulator, the filter frequency response is related with the frequency of local RF signal (LO) signal and dc bias applied to the intensity modulator. The free spectral range of filter passband can be tuned conveniently by changing the LO frequency. When 8 GHz LO signal is applied, an equivalent bandpass filter with null-to-null bandwidth of 8.1 GHz is obtained for a 25 km radio-over-fiber link. Meanwhile, by varying the dc bias, the weights and the number of taps can be adjusted to tune the performance of filter. Therefore, a flexible transversal bandpass filter implemented in a radio-over-fiber link is realized along with the tunability and reconfiguration.
{"title":"Tunable and configurable photonic microwave bandpass filter implemented in a radio-over-fiber link","authors":"Xianbin Yu, Xiaoping Zheng, Hanyi Zhang","doi":"10.1109/APMC.2006.4429389","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429389","url":null,"abstract":"A tunable and configurable photonic microwave bandpass filter with negative coefficient is proposed and demonstrated. Based on all-optical mixing in an intensity modulator and a phase modulator, the filter frequency response is related with the frequency of local RF signal (LO) signal and dc bias applied to the intensity modulator. The free spectral range of filter passband can be tuned conveniently by changing the LO frequency. When 8 GHz LO signal is applied, an equivalent bandpass filter with null-to-null bandwidth of 8.1 GHz is obtained for a 25 km radio-over-fiber link. Meanwhile, by varying the dc bias, the weights and the number of taps can be adjusted to tune the performance of filter. Therefore, a flexible transversal bandpass filter implemented in a radio-over-fiber link is realized along with the tunability and reconfiguration.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114391870","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429560
J. Bae, Jongsik Lim, Kwisoo Kim, Jonguk Kim, D. Ahn
A new structure of 3-way power divider which based on the structure of branch line hybrid coupler is proposed. The proposed 3-way power divider is designed using an intentional mismatching between the transmission line impedance and termination impedance. As the result, the reflected waves at through and coupling port transmit to isolation port, and resultantly this produces a 3-way power divider. The design concept is confirmed by the circuit and electromagnetically (EM) simulation results, and the fabricated circuit is illustrated with the measured performances. The predicted and measured S-parameters lead that the proposed circuit is a new 3-way power divider. The measured data agree well with the simulation with the error of less than 2.5%.
{"title":"A new type of 3-way power divider using an intentional mismatched termination","authors":"J. Bae, Jongsik Lim, Kwisoo Kim, Jonguk Kim, D. Ahn","doi":"10.1109/APMC.2006.4429560","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429560","url":null,"abstract":"A new structure of 3-way power divider which based on the structure of branch line hybrid coupler is proposed. The proposed 3-way power divider is designed using an intentional mismatching between the transmission line impedance and termination impedance. As the result, the reflected waves at through and coupling port transmit to isolation port, and resultantly this produces a 3-way power divider. The design concept is confirmed by the circuit and electromagnetically (EM) simulation results, and the fabricated circuit is illustrated with the measured performances. The predicted and measured S-parameters lead that the proposed circuit is a new 3-way power divider. The measured data agree well with the simulation with the error of less than 2.5%.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114434897","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429420
Shao-Yu Shu, Cheng Liang, Guluke Tong, B. Hu
A multiple-in multiple-out (MIMO), 5 GHz RF transceiver for wireless HDTV distribution is built with 0.18 mum CMOS technology. The transceiver utilizes a direct up transmitter and low-IF receiver architecture. A dual-quadrature direct up conversion mixer is used that achieved better than 35 dB image rejection without any on chip calibration. The measurement shows 6 dB typical receiver noise figure and better than 33 dB transmitter EVM at -5 dBm output power.
一个多入多出(MIMO)， 5 GHz射频收发器的无线高清电视分配构建了0.18 μ m CMOS技术。收发器采用直上式发射机和低中频接收机结构。采用双正交直接上变频混频器，无需任何片上校准即可实现35 dB以上的图像抑制。测量结果显示，在-5 dBm输出功率下，接收机典型噪声系数为6 dB，发射机EVM优于33 dB。
{"title":"A CMOS 5GHz RF transceiver for wireless HDTV distribution","authors":"Shao-Yu Shu, Cheng Liang, Guluke Tong, B. Hu","doi":"10.1109/APMC.2006.4429420","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429420","url":null,"abstract":"A multiple-in multiple-out (MIMO), 5 GHz RF transceiver for wireless HDTV distribution is built with 0.18 mum CMOS technology. The transceiver utilizes a direct up transmitter and low-IF receiver architecture. A dual-quadrature direct up conversion mixer is used that achieved better than 35 dB image rejection without any on chip calibration. The measurement shows 6 dB typical receiver noise figure and better than 33 dB transmitter EVM at -5 dBm output power.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117159422","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429371
Jing Gao, Lei Zhu
This paper presents a novel class of ultra-wideband (UWB: 3.1~10.6 GHz) bandpass filters formed on coplanar waveguide. Open-/short-circuited multiple-mode resonators (MMR) are constructed with three distinctive sections and their resonant performances are studied towards allocating the first three resonant modes occurring around the lower-end, center and higher-end of the concerned UWB passband. In parallel, the two parallel-coupled lines with short-/open-circuited ends are characterized to excite two coupling peaks below and above the UWB's center (6.85 GHz). These two UWB filters are then analyzed using a simple cascaded transmission-line network and optimized using the Momentum software, theoretically demonstrating a five-pole UWB passband performance. Predicted results are confirmed in experiment and they show the actual 2.8- to 10.2-GHz UWB passband with the insertion loss <1.5 dB and variation in group delay <0.33 ns.
{"title":"Analysis and optimization of ultra-wideband bandpass filters on coplanar waveguide","authors":"Jing Gao, Lei Zhu","doi":"10.1109/APMC.2006.4429371","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429371","url":null,"abstract":"This paper presents a novel class of ultra-wideband (UWB: 3.1~10.6 GHz) bandpass filters formed on coplanar waveguide. Open-/short-circuited multiple-mode resonators (MMR) are constructed with three distinctive sections and their resonant performances are studied towards allocating the first three resonant modes occurring around the lower-end, center and higher-end of the concerned UWB passband. In parallel, the two parallel-coupled lines with short-/open-circuited ends are characterized to excite two coupling peaks below and above the UWB's center (6.85 GHz). These two UWB filters are then analyzed using a simple cascaded transmission-line network and optimized using the Momentum software, theoretically demonstrating a five-pole UWB passband performance. Predicted results are confirmed in experiment and they show the actual 2.8- to 10.2-GHz UWB passband with the insertion loss <1.5 dB and variation in group delay <0.33 ns.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"447 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116331904","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429724
K. Y. Yazdandoost, R. Kohno
Wireless body area network for sensing and monitoring of vital signs is the one of most rapid growing wireless communication system. A key component of wireless body area network is an antenna. It must meet biocompatible and size- limit requirements. Therefore, antenna for wireless body area network faces numerous RF challenges. We used an antenna with two layers of substrate to cancel the effect of human body on antenna performance. In this paper we present an UWB antenna performance in the free space, on direct contact with human body and way out to reduce the effect of human body on antenna performance without any changes on antenna design.
{"title":"UWB antenna for wireless body area network","authors":"K. Y. Yazdandoost, R. Kohno","doi":"10.1109/APMC.2006.4429724","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429724","url":null,"abstract":"Wireless body area network for sensing and monitoring of vital signs is the one of most rapid growing wireless communication system. A key component of wireless body area network is an antenna. It must meet biocompatible and size- limit requirements. Therefore, antenna for wireless body area network faces numerous RF challenges. We used an antenna with two layers of substrate to cancel the effect of human body on antenna performance. In this paper we present an UWB antenna performance in the free space, on direct contact with human body and way out to reduce the effect of human body on antenna performance without any changes on antenna design.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123660938","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429590
L. Larson, D. Kimball, P. Asbeck, P. Draxler, J. Deng, Ming Li
Future generations of wireless communications are expected to place increasing burdens on the efficiency and linearity of power amplifiers, due to the use of more complex multi-carrier waveforms and OFDM. This has implications for the design of transmitters in portable/mobile devices as well as base stations and access points. This paper will summarize the digital predistortion techniques that can be employed to improve the performance of wireless power amplifiers.
{"title":"Digital predistortion techniques for linearized power amplifiers","authors":"L. Larson, D. Kimball, P. Asbeck, P. Draxler, J. Deng, Ming Li","doi":"10.1109/APMC.2006.4429590","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429590","url":null,"abstract":"Future generations of wireless communications are expected to place increasing burdens on the efficiency and linearity of power amplifiers, due to the use of more complex multi-carrier waveforms and OFDM. This has implications for the design of transmitters in portable/mobile devices as well as base stations and access points. This paper will summarize the digital predistortion techniques that can be employed to improve the performance of wireless power amplifiers.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121933798","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429467
C. Yu, Ka Tsun Mok, W. Chan, S. Leung
Traditional radio frequency bi-directional amplifiers rely on switches with their associated increase in cost, size and loss to achieve time division duplexing. A switchless bi-directional amplifier is proposed whereby the power amplifier (PA) and low noise amplifier (LNA) are connected directly in an anti-parallel configuration. Experimental results show that there is no gain degradation when compared with the individual power amplifier and low noise amplifier.
{"title":"Switchless bi-directional amplifier","authors":"C. Yu, Ka Tsun Mok, W. Chan, S. Leung","doi":"10.1109/APMC.2006.4429467","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429467","url":null,"abstract":"Traditional radio frequency bi-directional amplifiers rely on switches with their associated increase in cost, size and loss to achieve time division duplexing. A switchless bi-directional amplifier is proposed whereby the power amplifier (PA) and low noise amplifier (LNA) are connected directly in an anti-parallel configuration. Experimental results show that there is no gain degradation when compared with the individual power amplifier and low noise amplifier.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122178795","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 : 2006-12-01DOI: 10.1109/APMC.2006.4429523
Kun-Hung Tsai, Ching-Kuang C. Tzuang
This paper presents an alternative, new approach to the design of power divider based on composite right/left-handed transmission line (CRLH TL), where stopband propagation characteristics are employed. Two theoretical methods, namely, use of Floquet theorem analyzing CRLH TL of infinite length and scattering analyses of CRLH TL of finite length, lead to nearly identical complex modes and characteristics impedances. Complex conjugate terminations are required for achieving maximum reflectionless power transfer for the CRLH TL, such complex termination scheme is applied to the series type power divider design, showing theoretical limit of -3dB is attainable with plusmn13deg phase variation and 0.25 dB magnitude deviation across the entire stopband of the CRLH TL.
{"title":"Application of stopband of composite right/left-handed transmission line for broadband power divider design","authors":"Kun-Hung Tsai, Ching-Kuang C. Tzuang","doi":"10.1109/APMC.2006.4429523","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429523","url":null,"abstract":"This paper presents an alternative, new approach to the design of power divider based on composite right/left-handed transmission line (CRLH TL), where stopband propagation characteristics are employed. Two theoretical methods, namely, use of Floquet theorem analyzing CRLH TL of infinite length and scattering analyses of CRLH TL of finite length, lead to nearly identical complex modes and characteristics impedances. Complex conjugate terminations are required for achieving maximum reflectionless power transfer for the CRLH TL, such complex termination scheme is applied to the series type power divider design, showing theoretical limit of -3dB is attainable with plusmn13deg phase variation and 0.25 dB magnitude deviation across the entire stopband of the CRLH TL.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116850943","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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