Pub Date : 2006-12-01DOI: 10.1109/APMC.2006.4429472
Huan-Lin Chang, Po-Tsung Lin, Wei-Chun Hua, Chun-Ping Lin, Che-Yung Lin, Cheewee Liu, Tzu-Yi Yang, G. Ma
A differential power combining method for general power amplifiers (PAs) with combining and matching network using lumped components is proposed for the first time. The proposed power combining technique greatly reduces board area at 1.95 GHz as compared to the traditional in-phase power combining method using transmission line, such as Wilkinson power combiners. The output matching is achieved with smaller impedance transformation ratio and the matching loss is reduced. The proposed SiGe PA with power combining technique achieves 28 dBm output power, 14 dB gain and 22.6% power-added efficiency (PAE) at 1.95 GHz with 1dB output power enhancement as compared to the single PA.
{"title":"Differential power combining technique for general power amplifiers using lumped component network","authors":"Huan-Lin Chang, Po-Tsung Lin, Wei-Chun Hua, Chun-Ping Lin, Che-Yung Lin, Cheewee Liu, Tzu-Yi Yang, G. Ma","doi":"10.1109/APMC.2006.4429472","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429472","url":null,"abstract":"A differential power combining method for general power amplifiers (PAs) with combining and matching network using lumped components is proposed for the first time. The proposed power combining technique greatly reduces board area at 1.95 GHz as compared to the traditional in-phase power combining method using transmission line, such as Wilkinson power combiners. The output matching is achieved with smaller impedance transformation ratio and the matching loss is reduced. The proposed SiGe PA with power combining technique achieves 28 dBm output power, 14 dB gain and 22.6% power-added efficiency (PAE) at 1.95 GHz with 1dB output power enhancement as compared to the single PA.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"2 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":"122373030","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.2006.4429588
P. Gilabert, G. Montoro, A. Cesari
A nonlinear auto-regressive moving average (ARMA) structure capable of compensating nonlinear memory effects in RF power amplifiers is here presented. Results on the linearity improvement, in both in-band and out-of-band distortion compensation, achieved by this baseband digital predistorter are provided. Moreover, a study on this nonlinear ARMA system stability is also reported.
{"title":"A recursive digital predistorter for linearizing RF power amplifiers with memory effects","authors":"P. Gilabert, G. Montoro, A. Cesari","doi":"10.1109/APMC.2006.4429588","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429588","url":null,"abstract":"A nonlinear auto-regressive moving average (ARMA) structure capable of compensating nonlinear memory effects in RF power amplifiers is here presented. Results on the linearity improvement, in both in-band and out-of-band distortion compensation, achieved by this baseband digital predistorter are provided. Moreover, a study on this nonlinear ARMA system stability is also reported.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"43 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":"123739394","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.2006.4429653
J. Zehentner, J. Macháč, P. Zabloudil
A new concept of a passive waveguide reflection attenuator and a T-junction with a variable ratio of the output powers is reported here. A conductive uniform linear polarization grid of nano thickness is inserted into the standard rectangular waveguide. Rotation of the grid results in a change of the output powers. The measured scattering matrix elements compare well with the computer simulation, confirming the expected characteristics of the two circuits.
{"title":"Power control in passive waveguide circuits","authors":"J. Zehentner, J. Macháč, P. Zabloudil","doi":"10.1109/APMC.2006.4429653","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429653","url":null,"abstract":"A new concept of a passive waveguide reflection attenuator and a T-junction with a variable ratio of the output powers is reported here. A conductive uniform linear polarization grid of nano thickness is inserted into the standard rectangular waveguide. Rotation of the grid results in a change of the output powers. The measured scattering matrix elements compare well with the computer simulation, confirming the expected characteristics of the two circuits.","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":"132208414","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.2006.4429618
Y. Hsu, Zhenghe Feng
In this paper, a synthesis method by using genetic algorithm is introduced to design cross-coupled bandpass resonator filters. The method using genetic algorithms is a global optimization method, and it does not need a proper initial value. It has good convergence, and two examples are shown. One is a none-cross-coupled filter; the other is a cross-coupled filter. A 4-order bandpass filter whose center- frequency is 5.8 GHz, and the bandwidth is 30 MHz is designed to prove the effectiveness of the method.
{"title":"A method of synthesis of cross-coupled bandpass resonator filters by using Genetic Algorithms","authors":"Y. Hsu, Zhenghe Feng","doi":"10.1109/APMC.2006.4429618","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429618","url":null,"abstract":"In this paper, a synthesis method by using genetic algorithm is introduced to design cross-coupled bandpass resonator filters. The method using genetic algorithms is a global optimization method, and it does not need a proper initial value. It has good convergence, and two examples are shown. One is a none-cross-coupled filter; the other is a cross-coupled filter. A 4-order bandpass filter whose center- frequency is 5.8 GHz, and the bandwidth is 30 MHz is designed to prove the effectiveness of the method.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"30 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":"127952367","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.2006.4429635
Kyoung-Pyo Ahn, A. Saitou, K. Honjo
In this paper, the analytic formula of the group delay of one-stage coupled four lines BPF is proposed. The analytic formula agrees well with measured group delay of one-stage BPF, except for at band-edges. In case of multi-stage BPF, the sum of analyzed group delay of each stage is quite agrees with measured result in UWB band (3.1 GHz - 10.6 GHz). A 6-stage BPF with impedance transformation from 50 Omega to 172 Omega, the input impedance of the self-complementary antenna, is shown as an example.
{"title":"Group delay analysis of differential-mode coupled four lines bandpass filters","authors":"Kyoung-Pyo Ahn, A. Saitou, K. Honjo","doi":"10.1109/APMC.2006.4429635","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429635","url":null,"abstract":"In this paper, the analytic formula of the group delay of one-stage coupled four lines BPF is proposed. The analytic formula agrees well with measured group delay of one-stage BPF, except for at band-edges. In case of multi-stage BPF, the sum of analyzed group delay of each stage is quite agrees with measured result in UWB band (3.1 GHz - 10.6 GHz). A 6-stage BPF with impedance transformation from 50 Omega to 172 Omega, the input impedance of the self-complementary antenna, is shown as an example.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"46 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":"123403131","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.2006.4429739
Yen-Chi Shen, Yu-Shin Wang, Shyh-Jong Chung
In this paper, a tri-band antenna for wireless communication applications is presented. The antenna is composed of two different elements, that are an inverted-L monopole operating at 5.2 and 5.8 GHz and a coupled modified half-wavelength open-loop resonator operating at both 2.4 GHz and 3.5 GHz to cover the required bandwidth for IEEE 802.11a/b/g WLAN and IEEE 802.16e. The proposed antenna has the properties of good performance, small size, low profile, and low cost, which is thus suitable for practical applications in the multi-band wireless communication systems.
{"title":"A printed triple-band antenna for WiFi and WiMAX applications","authors":"Yen-Chi Shen, Yu-Shin Wang, Shyh-Jong Chung","doi":"10.1109/APMC.2006.4429739","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429739","url":null,"abstract":"In this paper, a tri-band antenna for wireless communication applications is presented. The antenna is composed of two different elements, that are an inverted-L monopole operating at 5.2 and 5.8 GHz and a coupled modified half-wavelength open-loop resonator operating at both 2.4 GHz and 3.5 GHz to cover the required bandwidth for IEEE 802.11a/b/g WLAN and IEEE 802.16e. The proposed antenna has the properties of good performance, small size, low profile, and low cost, which is thus suitable for practical applications in the multi-band wireless communication systems.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"234 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":"121420556","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.2006.4429736
C. Wagner, A. Stelzer, H. Jager
The influence of phase noise and frequency sweep linearity on radar system performance is discussed using measurement data of a linear frequency modulated continuous wave (LFMCW) radar transmitter, consisting of a 77-GHz voltage controlled oscillator (VCO) and a 19-GHz down-converter manufactured in a 200-GHz silicon germanium (SiGe) technology.
{"title":"Estimation of FMCW radar system performance using measurement data of a 77-GHz transmitter","authors":"C. Wagner, A. Stelzer, H. Jager","doi":"10.1109/APMC.2006.4429736","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429736","url":null,"abstract":"The influence of phase noise and frequency sweep linearity on radar system performance is discussed using measurement data of a linear frequency modulated continuous wave (LFMCW) radar transmitter, consisting of a 77-GHz voltage controlled oscillator (VCO) and a 19-GHz down-converter manufactured in a 200-GHz silicon germanium (SiGe) technology.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"120 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":"122973223","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.2006.4429797
S. Chakraborty, U. Kumar Dey, S. Panda, B. Gupta, K. Yasumoto
High speed ultra wide band PAN links with data rate greater than 100 Mbps would use the proposed IEEE 802.15.3a (USB) protocol harnessing multiple access CSMA-CD and frequency switched OFDM technologies. Two new printed antennas are developed and tested for application in such broad band microwave communication schemes fulfilling required specifications. For the first antenna, one quadrant of a circular microstrip patch is excited with adjustable probe feed and the other three quadrants are electromagnetically coupled to it. Using 1/16" PTFE substrate with epsivT = 2.4 gives ~3% 2:1 V.S.W.R. band width ( about central frequency ) at 10 GHz for a simple circular microstrip patch antenna, but it improves to ~7.5% (with about -32 dB return loss at centre frequency) for the antenna developed. Further introduction of a W-shaped planar slot in the ground plane improves the 2:1 V.S.W.R. band width to ~13% for the second antenna. In both cases there is no radiation pattern distortion unlike other parasitically loaded patch antennas.
{"title":"Parasitically loaded broad band microstrip antennas for proposed IEEE 802.15.3a (UWB) communication systems","authors":"S. Chakraborty, U. Kumar Dey, S. Panda, B. Gupta, K. Yasumoto","doi":"10.1109/APMC.2006.4429797","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429797","url":null,"abstract":"High speed ultra wide band PAN links with data rate greater than 100 Mbps would use the proposed IEEE 802.15.3a (USB) protocol harnessing multiple access CSMA-CD and frequency switched OFDM technologies. Two new printed antennas are developed and tested for application in such broad band microwave communication schemes fulfilling required specifications. For the first antenna, one quadrant of a circular microstrip patch is excited with adjustable probe feed and the other three quadrants are electromagnetically coupled to it. Using 1/16\" PTFE substrate with epsivT = 2.4 gives ~3% 2:1 V.S.W.R. band width ( about central frequency ) at 10 GHz for a simple circular microstrip patch antenna, but it improves to ~7.5% (with about -32 dB return loss at centre frequency) for the antenna developed. Further introduction of a W-shaped planar slot in the ground plane improves the 2:1 V.S.W.R. band width to ~13% for the second antenna. In both cases there is no radiation pattern distortion unlike other parasitically loaded patch antennas.","PeriodicalId":137931,"journal":{"name":"2006 Asia-Pacific Microwave Conference","volume":"285 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":"122974440","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.2006.4429601
W. Woo, K. An, O. Lee, Jae J. Chang, Chang-Ho Lee, Kiseok Yang, Mi-Jeong Park, Haksun Kim, J. Laskar
This paper presents a new polar transmitter architecture that employs analog predistortion to provide substantially instantaneous correction of amplitude and phase errors in RF PAs. This approach enables to enhance the linear output power capability and efficiency of a PA, simultaneously. Unlike conventional architectures using a closed-loop feedback, no downconversion receiver is included in the transmitter. Moreover, only even-order distortion components are used to predistort the input signal in a multiplicative manner so that the effective correction bandwidth is greatly enhanced. For validation of the architecture, a PA circuit model was designed, based upon the TSMC 0.18-um CMOS technology. In the simulation results, the proposed architecture reduced PA nonlinearity from 2 dB to 0.5 dB for gain and from 18deg to plusmn0.5deg for phase. Also, the simulation results exhibited EVMs of less than 0.5% in RMS and 5% in peak, a PAE of 58% at the output power of 33 dBm.
本文提出了一种新的极性发射机结构，该结构采用模拟预失真来提供射频放大器中幅度和相位误差的基本瞬时校正。这种方法可以同时提高放大器的线性输出功率能力和效率。与使用闭环反馈的传统架构不同，发射器中不包含下变频接收器。此外，仅使用偶阶失真分量以乘法方式对输入信号进行预失真，从而大大提高了有效校正带宽。为了验证该架构，设计了基于台积电0.18 um CMOS技术的PA电路模型。在仿真结果中，所提出的架构将增益从2 dB降低到0.5 dB，相位从18°降低到±0.5°。仿真结果表明，在输出功率为33 dBm时，evm的有效值小于0.5%，峰值小于5%，PAE为58%。
{"title":"A novel linear polar transmitter architecture using low-power analog predistortion for EDGE applications","authors":"W. Woo, K. An, O. Lee, Jae J. Chang, Chang-Ho Lee, Kiseok Yang, Mi-Jeong Park, Haksun Kim, J. Laskar","doi":"10.1109/APMC.2006.4429601","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429601","url":null,"abstract":"This paper presents a new polar transmitter architecture that employs analog predistortion to provide substantially instantaneous correction of amplitude and phase errors in RF PAs. This approach enables to enhance the linear output power capability and efficiency of a PA, simultaneously. Unlike conventional architectures using a closed-loop feedback, no downconversion receiver is included in the transmitter. Moreover, only even-order distortion components are used to predistort the input signal in a multiplicative manner so that the effective correction bandwidth is greatly enhanced. For validation of the architecture, a PA circuit model was designed, based upon the TSMC 0.18-um CMOS technology. In the simulation results, the proposed architecture reduced PA nonlinearity from 2 dB to 0.5 dB for gain and from 18deg to plusmn0.5deg for phase. Also, the simulation results exhibited EVMs of less than 0.5% in RMS and 5% in peak, a PAE of 58% at the output power of 33 dBm.","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":"123017609","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.2006.4429386
T. Matsuba, T. Ishikawa, H. Fukuyama, M. Hirata, M. Kijima, M. Muraguchi
Optical CDMA provides several attractive features: a simple access protocol, desirable quality deterioration, flexibility of user allotment, flexibility of asynchronous, decentralized network operation, and inherent data security. The paper presents a new optical CDMA system for office LAN systems and demonstrates the validity of our system by using a 10-Gbps optical fiber system. Moreover, a new technique for fast code acquisition is presented and demonstrated. The technique using DFF as a digital code-pattern comparator has the significant merits of faster code acquisition and lower power consumption than the conventional serial-search code-acquisition technique and the parallel-search code-acquisition technique using a matched filter.
{"title":"Proposal of new optical CDMA systems and fast code acquisition techniques","authors":"T. Matsuba, T. Ishikawa, H. Fukuyama, M. Hirata, M. Kijima, M. Muraguchi","doi":"10.1109/APMC.2006.4429386","DOIUrl":"https://doi.org/10.1109/APMC.2006.4429386","url":null,"abstract":"Optical CDMA provides several attractive features: a simple access protocol, desirable quality deterioration, flexibility of user allotment, flexibility of asynchronous, decentralized network operation, and inherent data security. The paper presents a new optical CDMA system for office LAN systems and demonstrates the validity of our system by using a 10-Gbps optical fiber system. Moreover, a new technique for fast code acquisition is presented and demonstrated. The technique using DFF as a digital code-pattern comparator has the significant merits of faster code acquisition and lower power consumption than the conventional serial-search code-acquisition technique and the parallel-search code-acquisition technique using a matched filter.","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":"126366611","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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