Pub Date : 2008-12-01DOI: 10.1109/IMWS.2008.4782299
Tao Wu, Xiaohong Tang, F. Xiao
In this paper, the stepped impedance resonator filter is introduced whose parasitic passband, one of the key characteristics of stepped impedance resonator filter, is analyzed. Then, the methods to improve the parasitic passband suppression are proposed. The research shows that three different components: the lambda/4 open stub, the VIA and the resistance attached to the center of the stepped impedance resonator, can be used to suppress parasitic passband to some extent. After the comparison among these three methods, the conclusion is drawn that the stepped impedance resonator filter with a 10 Omega resistance loaded at the center of the resonator is the suitable choice for best frequency response.
{"title":"Research on the Parasitic Passband Suppression of Microstrip Stepped Impedance Resonator Filters","authors":"Tao Wu, Xiaohong Tang, F. Xiao","doi":"10.1109/IMWS.2008.4782299","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782299","url":null,"abstract":"In this paper, the stepped impedance resonator filter is introduced whose parasitic passband, one of the key characteristics of stepped impedance resonator filter, is analyzed. Then, the methods to improve the parasitic passband suppression are proposed. The research shows that three different components: the lambda/4 open stub, the VIA and the resistance attached to the center of the stepped impedance resonator, can be used to suppress parasitic passband to some extent. After the comparison among these three methods, the conclusion is drawn that the stepped impedance resonator filter with a 10 Omega resistance loaded at the center of the resonator is the suitable choice for best frequency response.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132973872","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 : 2008-12-01DOI: 10.1109/IMWS.2008.4782288
Zucun Zhang, W. Dou
In this paper, firstly, focal field of Reverse-Microscope System (RMS) at millimeter wavelengths is analyzed, The contour diagram of electric field in the focal plane of RMS when the linearly polarized plane wave impact on it with different incident angles is calculated with ray-tracing method and Stratton-Chu vector diffraction integral formula. Then we add a scanning system in front of the RMS to form a Scanning Reverse-Microscope System (SRMS). The contour diagram of the SRMS is also calculated. The numerical results are very useful for us to design a millimeter-wave imaging system with low cost and high performance in our next work.
{"title":"Millimeter-Wave Imaging Using Reverse-Microscope and Scanning System","authors":"Zucun Zhang, W. Dou","doi":"10.1109/IMWS.2008.4782288","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782288","url":null,"abstract":"In this paper, firstly, focal field of Reverse-Microscope System (RMS) at millimeter wavelengths is analyzed, The contour diagram of electric field in the focal plane of RMS when the linearly polarized plane wave impact on it with different incident angles is calculated with ray-tracing method and Stratton-Chu vector diffraction integral formula. Then we add a scanning system in front of the RMS to form a Scanning Reverse-Microscope System (SRMS). The contour diagram of the SRMS is also calculated. The numerical results are very useful for us to design a millimeter-wave imaging system with low cost and high performance in our next work.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133072093","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}
A compact FSS (frequency selective surface) filter will be designed in this paper. The length of the filter is reduced by the use of both bandpass and bandstop FSSs. A sample filter at 8.05 GHz will be designed using CST Studio as an example. Simulation results show that the FSS filter has a bandwidth of 800 MHz and a reflection lower than -20 dB. Tested results from this sample filter agree well with the simulation results. The length of the sample filter is less than half of a directly-coupled waveguide filter with the same specifications.
{"title":"Design of a FSS Waveguide Filter at 8.05 GHz","authors":"Shu-Feng Cai, Qingyuan Wang, Zheyu Wang, Yanfen Zhai","doi":"10.1109/IMWS.2008.4782292","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782292","url":null,"abstract":"A compact FSS (frequency selective surface) filter will be designed in this paper. The length of the filter is reduced by the use of both bandpass and bandstop FSSs. A sample filter at 8.05 GHz will be designed using CST Studio as an example. Simulation results show that the FSS filter has a bandwidth of 800 MHz and a reflection lower than -20 dB. Tested results from this sample filter agree well with the simulation results. The length of the sample filter is less than half of a directly-coupled waveguide filter with the same specifications.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129632237","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 : 2008-12-01DOI: 10.1109/IMWS.2008.4782284
Mingqi Zhou, Xiaohong Tang, F. Xiao
A compact dual band bandpass filter is presented here, in which an open loop resonator connected with a short-circuited stub loaded in the midpoint is used. The central frequencies of two bands can be regulated by alternating the characteristic impedance and electrical length of the open loop and the short-circuited stub respectively. By introducing new coupling structure, the coupling coefficient of each band can be regulated independently. External coupling for each band is realized through common feed line and can also be regulated independently. Furthermore, source-load capacitive coupling is introduced to produce four transmission zeroes at the adjacent of two passbands. Thus, the bandwidths of this filter are controllable and good selectivity can be realized for narrow band application. A 2.4 GHz/5.7 GHz dual band microstrip filter with equal absolute bandwidths is designed and measured. The measured result agrees well with the simulation. The size of the filter is only 6.26 mm times 5.16 mm, and thus is very compact.
{"title":"Design of Compact Dual Band Bandpass Filter with Controllable Bandwidths and Good Selectivity","authors":"Mingqi Zhou, Xiaohong Tang, F. Xiao","doi":"10.1109/IMWS.2008.4782284","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782284","url":null,"abstract":"A compact dual band bandpass filter is presented here, in which an open loop resonator connected with a short-circuited stub loaded in the midpoint is used. The central frequencies of two bands can be regulated by alternating the characteristic impedance and electrical length of the open loop and the short-circuited stub respectively. By introducing new coupling structure, the coupling coefficient of each band can be regulated independently. External coupling for each band is realized through common feed line and can also be regulated independently. Furthermore, source-load capacitive coupling is introduced to produce four transmission zeroes at the adjacent of two passbands. Thus, the bandwidths of this filter are controllable and good selectivity can be realized for narrow band application. A 2.4 GHz/5.7 GHz dual band microstrip filter with equal absolute bandwidths is designed and measured. The measured result agrees well with the simulation. The size of the filter is only 6.26 mm times 5.16 mm, and thus is very compact.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131665705","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 : 2008-12-01DOI: 10.1109/IMWS.2008.4782297
W. Tong, Zhirun Hu, Jingwen Xu, Haiying Zhang
Super compact microstrip line and CPW filters based on left-handed (LH) metamaterial medium for RF and microwave applications are presented and demonstrated by the full wave simulation and experimental results. The microstrip bandstop filter has a centre frequency of 1.164 GHz and a fractional bandwidth of 0.51%. The loaded quality factor of the filter is 197. The filter is more than 4 times smaller than that of the filter loaded with conventional transmission line. The CPW GaAs MMIC filter exhibits a broad passband from 6 GHz to 18 GHz with a size of 1.43 mm2.
{"title":"Left-Handed Metamaterials for RF and Microwave Filter Miniaturization","authors":"W. Tong, Zhirun Hu, Jingwen Xu, Haiying Zhang","doi":"10.1109/IMWS.2008.4782297","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782297","url":null,"abstract":"Super compact microstrip line and CPW filters based on left-handed (LH) metamaterial medium for RF and microwave applications are presented and demonstrated by the full wave simulation and experimental results. The microstrip bandstop filter has a centre frequency of 1.164 GHz and a fractional bandwidth of 0.51%. The loaded quality factor of the filter is 197. The filter is more than 4 times smaller than that of the filter loaded with conventional transmission line. The CPW GaAs MMIC filter exhibits a broad passband from 6 GHz to 18 GHz with a size of 1.43 mm2.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122934968","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 : 2008-12-01DOI: 10.1109/IMWS.2008.4782309
Haiyan Jin, G. Wen, Yamazaki Jin
In this paper, a Ka-band combining power amplifier based on SIW/HMSIW technology is presented and studied. The advantages of this structure are its low profile, low-lost, mass-productive, ease of fabrication and fully integrated with planar circuits. In addition, efficient heat sinking of monolithic microwave integrated circuit (MMIC) devices is achieved. Lastly a SIW/HMSIW power amplifier using eight MMIC amplifiers was designed and fabricated in 33.5-35.5 GHz. The measured results show a good agreement with simulation and a combining efficiency of 72% is achieved at 34.3 GHz.
{"title":"A Novel Spatial Power Combiner Based on SIW and HMSIW","authors":"Haiyan Jin, G. Wen, Yamazaki Jin","doi":"10.1109/IMWS.2008.4782309","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782309","url":null,"abstract":"In this paper, a Ka-band combining power amplifier based on SIW/HMSIW technology is presented and studied. The advantages of this structure are its low profile, low-lost, mass-productive, ease of fabrication and fully integrated with planar circuits. In addition, efficient heat sinking of monolithic microwave integrated circuit (MMIC) devices is achieved. Lastly a SIW/HMSIW power amplifier using eight MMIC amplifiers was designed and fabricated in 33.5-35.5 GHz. The measured results show a good agreement with simulation and a combining efficiency of 72% is achieved at 34.3 GHz.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"226 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115314971","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 : 2008-12-01DOI: 10.1109/IMWS.2008.4782264
H. Ahn, Bumman Kim
In this paper, modified small asymmetric impedance transformers are suggested. The impedance transformers should transform a real impedance into another one. For this purpose, design technique, being able to transform a complex impedance (admittance) into a real impedance (admittance) only with a transmission-line section, is required. Using this, two types of modified ones are introduced and simulated at a design center frequency of 1 GHz. Their simulation results show considerable bandwidths compared with their sizes.
{"title":"Modified Small Asymmetric Impedance Transformers","authors":"H. Ahn, Bumman Kim","doi":"10.1109/IMWS.2008.4782264","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782264","url":null,"abstract":"In this paper, modified small asymmetric impedance transformers are suggested. The impedance transformers should transform a real impedance into another one. For this purpose, design technique, being able to transform a complex impedance (admittance) into a real impedance (admittance) only with a transmission-line section, is required. Using this, two types of modified ones are introduced and simulated at a design center frequency of 1 GHz. Their simulation results show considerable bandwidths compared with their sizes.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130058106","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 : 2008-12-01DOI: 10.1109/IMWS.2008.4782251
Y. Chiou, Cheng-Hsiu Tsai, Juo-Shiuan Wu, J. Kuo
Miniaturization of a microstrip rat race coupler is implemented by three approaches. First, a new rat race hybrid design is devised for circuit miniaturization based on the periodic stepped-impedance ring structure. The circuit has a normalized area of 21.5%. In the second approach, miniaturization is carried out by incorporating a broadside-coupled structure and stepped-impedance sections into the design. The former is used to replace the 3lambda/4-section and the latter is to substitute each lambda/4-section in the regular 6lambda/4 circuits. As a result, one of the circuits occupies only 18% of the area of a traditional rat race. Finally, a general synthesis is performed to design reduced-length rat race rings. Incorporating the stepped-impedance configuration, the normalized circuit area is 13.12% of a 6lambda/4-ring. All the designs are validated by comparing measured four-port parameters with the simulated results.
{"title":"Miniaturization Design for Planar Hybrid Ring Couplers","authors":"Y. Chiou, Cheng-Hsiu Tsai, Juo-Shiuan Wu, J. Kuo","doi":"10.1109/IMWS.2008.4782251","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782251","url":null,"abstract":"Miniaturization of a microstrip rat race coupler is implemented by three approaches. First, a new rat race hybrid design is devised for circuit miniaturization based on the periodic stepped-impedance ring structure. The circuit has a normalized area of 21.5%. In the second approach, miniaturization is carried out by incorporating a broadside-coupled structure and stepped-impedance sections into the design. The former is used to replace the 3lambda/4-section and the latter is to substitute each lambda/4-section in the regular 6lambda/4 circuits. As a result, one of the circuits occupies only 18% of the area of a traditional rat race. Finally, a general synthesis is performed to design reduced-length rat race rings. Incorporating the stepped-impedance configuration, the normalized circuit area is 13.12% of a 6lambda/4-ring. All the designs are validated by comparing measured four-port parameters with the simulated results.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125308609","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 : 2008-12-01DOI: 10.1109/IMWS.2008.4782287
B. Wang, Y.X. Wang, J. Wang, X. Wang, J. Deng, S.S. Gao
This paper summarizes recent researches on miniaturization of planar microwave passive components, in Computational Electromagnetics Laboratory at University of Electronic Science and Technology of China. Several filters and couplers are introduced, which can realize high performance with compact structures.
{"title":"Researches on Miniaturization of Planar Microwave Passive Components in CEMLAB at UESTC","authors":"B. Wang, Y.X. Wang, J. Wang, X. Wang, J. Deng, S.S. Gao","doi":"10.1109/IMWS.2008.4782287","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782287","url":null,"abstract":"This paper summarizes recent researches on miniaturization of planar microwave passive components, in Computational Electromagnetics Laboratory at University of Electronic Science and Technology of China. Several filters and couplers are introduced, which can realize high performance with compact structures.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121363399","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 : 2008-12-01DOI: 10.1109/IMWS.2008.4782290
Yong-Xin Guo, D. Hua, J. P. Wang
A new wideband circularly polarized patch antenna with a single feeding is proposed. Capacitive gap and parasitic patch are implemented in order to enhance the impedance and axial ratio bandwidths.
提出了一种新型的单馈宽带圆极化贴片天线。为了提高阻抗和轴比带宽，采用了电容隙和寄生贴片。
{"title":"Wideband Circularly Polarized Patch Antenna with a Single Feeding","authors":"Yong-Xin Guo, D. Hua, J. P. Wang","doi":"10.1109/IMWS.2008.4782290","DOIUrl":"https://doi.org/10.1109/IMWS.2008.4782290","url":null,"abstract":"A new wideband circularly polarized patch antenna with a single feeding is proposed. Capacitive gap and parasitic patch are implemented in order to enhance the impedance and axial ratio bandwidths.","PeriodicalId":257679,"journal":{"name":"2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116268145","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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