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2007 Asia-Pacific Microwave Conference最新文献

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500W Long-Pulse High Efficiency UHF BJT Transistor for Radar Applications 雷达用500W长脉冲高效率超高频BJT晶体管
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554735
T. Shi, J. Chang, L. Leverich, C. Leader
{"title":"500W Long-Pulse High Efficiency UHF BJT Transistor for Radar Applications","authors":"T. Shi, J. Chang, L. Leverich, C. Leader","doi":"10.1109/APMC.2007.4554735","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554735","url":null,"abstract":"A 500 W very long-pulse high efficiency BJT power transistor is presented, which operates at 6 mS pulse width, 20% duty cycle and 36 V supply voltage. The output power exceeds 500 Watts; the efficiency is higher than 60%; and power gain is greater than 11dB across 400 MHz to 450 MHz. The die layout, internal impedance matching technique and external impedance matching of the test fixture design is also described. The thermal resistance is 0.25C/W. The junction temperature remains below 150 C at the heat sink temperature of 70 C. This transistor uses state-of-the-art silicon BJT technology in a common emitter configuration and class C operation. This combination of high power, long-pulse, and high efficiency makes these devices ideally suited for transmitter designs in UHF radar systems.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117135424","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}
引用次数: 2
Low Profile Monopolar Patch Antenna with Dielectric Resonator Loading 介质谐振腔负载的低轮廓单极贴片天线
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554911
Yi-Wah Chan, K. Luk
{"title":"Low Profile Monopolar Patch Antenna with Dielectric Resonator Loading","authors":"Yi-Wah Chan, K. Luk","doi":"10.1109/APMC.2007.4554911","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554911","url":null,"abstract":"This presentation exhibits a small low-profile wideband patch antenna with dielectric resonator (DR) loading. This compact antenna consists of a square patch with shorting walls and cross-shaped probe feeding to increase the bandwidth of the conventional patch antenna to 50% and also minimizes the height of the antenna to less than 0.1 lambdaL. Additional dielectric resonator loading is used to further increase the impedance bandwidth up to 70%, from 2.44 to 5.12 GHz. The height is maintained at 0.081 lambdaL and the square patch size is 0.244 lambdaL where lambdaL referred to the lowest operating frequency.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121044558","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}
引用次数: 0
A Study on the Improvement of EM Wave Absorption Properties with Al(OH)3 Al(OH)3改善电磁波吸收性能的研究
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554595
D. Lee, D. Kim, Chang-Mook Choi, Young-Man Song
{"title":"A Study on the Improvement of EM Wave Absorption Properties with Al(OH)3","authors":"D. Lee, D. Kim, Chang-Mook Choi, Young-Man Song","doi":"10.1109/APMC.2007.4554595","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554595","url":null,"abstract":"In this paper, we investigated how to improve the EM wave absorption properties with Al(OH)3. Where we compared results for the case of the absorption properties of samples containing 0 wt%, 1 wt%, 3 wt%, 5 wt%, and 7 wt% of Al(OH)3. The absorption property curve just has the tendency to improve the characteristics at 5 wt% of Al(OH)3 at Sendust, and at 3 wt% of Al(OH)3 at Carbon. As a result, the optimized composition ratio of Al(OH)3 is 5 wt% at Sendust and 3 wt% at Carbon. Al(OH)3 is an important material to increase EM wave absorption in Sendust or Carbon EM wave absorbers.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124789038","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}
引用次数: 5
Bandpass Filter Realization Using Degenerate Dual-Modes of a New Type of Patch Resonator for Significant Size Reduction 采用简并双模的新型贴片谐振器实现带通滤波器，显著减小了尺寸
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554771
S. R. Zinka, A. Mohan, A. Biswas
{"title":"Bandpass Filter Realization Using Degenerate Dual-Modes of a New Type of Patch Resonator for Significant Size Reduction","authors":"S. R. Zinka, A. Mohan, A. Biswas","doi":"10.1109/APMC.2007.4554771","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554771","url":null,"abstract":"A new type of dual mode patch resonator is proposed and dual-mode bandpass filters are designed by perturbing its degenerate modes using two slots which are orthogonal to each other. It has been shown that resonant frequencies of the degenerate modes can be varied independently by adjusting one slot length at a time. Geometrical size as well as radiation loss has been reduced further by using inductively loaded cross-slotted patch resonator. A bandpass filter operating at 2.98GHz with a fractional bandwidth of 4.69% is designed after miniaturization. A size reduction of approximately 30% is observed when compared with miniaturized triangular patch resonators, for the same center frequency.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"22 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124876809","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}
引用次数: 4
A Novel Compact Microstrip Bandstop Filter Based on Spiral Resonators 基于螺旋谐振器的新型紧凑型微带带阻滤波器
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554774
Ho Lim, Jong-Hyuk Lee, Sangho Lim, Donghoon Shin, N. Myung
{"title":"A Novel Compact Microstrip Bandstop Filter Based on Spiral Resonators","authors":"Ho Lim, Jong-Hyuk Lee, Sangho Lim, Donghoon Shin, N. Myung","doi":"10.1109/APMC.2007.4554774","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554774","url":null,"abstract":"A novel compact microstrip bandstop filter using spiral resonators (SRs) is proposed. An array of SRs topology which is etched on the center line has stopband characteristics. And this microstrip bandstop filter can be implemented with very small size because of the sub-wavelength effect of SRs. The 3-cell SR filter is fabricated and verified by measurements. We have obtained low insertion loss in the passband and high rejection level in the stopband with steep cutoff. This novel structure is easy to fabricate and is a promising structure that is compatible with MMIC or PCB process.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125129916","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}
引用次数: 15
An Experimental Study of Passive UHF RFID System with Longer Communication Range 较远距离无源超高频RFID系统的实验研究
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554640
H. Matsumoto, K. Takei
{"title":"An Experimental Study of Passive UHF RFID System with Longer Communication Range","authors":"H. Matsumoto, K. Takei","doi":"10.1109/APMC.2007.4554640","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554640","url":null,"abstract":"Radio-frequency identification (RFID) systems are useful for reducing costs in supply chains. The communication range between the reader and the tag is one of the most important points in the application of RFID to supply chain management. We present results of experiments conducted on our passive RFID prototype system that we designed with the aim of increasing the communication range. It uses an intermittent transmission method to reduce the power consumption of the tag IC. Our results show that the power consumption was reduced to about three-quarters by using intermittent transmission with a duty ratio of 40%. Our experimental results indicate that optimization of the transmitting signal is effective for saving power consumption at tag IC and increasing the communication range.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125891273","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}
引用次数: 29
Substrate noise suppression by PGS of inductors 电感的PGS抑制衬底噪声
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554556
Hua Shen, Jian Wen, X. Duo, X. Lv
{"title":"Substrate noise suppression by PGS of inductors","authors":"Hua Shen, Jian Wen, X. Duo, X. Lv","doi":"10.1109/APMC.2007.4554556","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554556","url":null,"abstract":"Substrate noise is an important problem in single chip solution. An experimental study and a physical model describing substrate noise suppression by patterned ground shield (PGS) of inductors are presented in this paper. Different grounding methods of PGS are used to compare the different effects on substrate noise suppression. To make the design immune to substrate noise, the parasitic inductance and resistance of the on-chip ground connection of PGS have to be kept as low as possible.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126607488","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}
引用次数: 3
The Miniature 2.4/5.2 GHz Dual-Band Bandpass Filter with Modified Hairpin Structure 改进发夹结构的微型2.4/5.2 GHz双频带通滤波器
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554790
C. Kung, Ying-Chung Chen, Cheng-Fu Yang, M. Houng
{"title":"The Miniature 2.4/5.2 GHz Dual-Band Bandpass Filter with Modified Hairpin Structure","authors":"C. Kung, Ying-Chung Chen, Cheng-Fu Yang, M. Houng","doi":"10.1109/APMC.2007.4554790","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554790","url":null,"abstract":"A compact dual-band bandpass filter is designed to operate at 2.4/5.2 GHz without any input/output impedance matching. This filter is constructed of three resonators which are based on the stepped impedance resonators and hairpin resonators. The A1203 ceramic with a thickness of 0.6 mm and a relative dielectric constant of 9.4 was adopted as substrate. It is easy to be integrated with other RF circuits by SOP (System on Package) process. The three-order dual-band bandpass filter is optimally designed and its properties are confirmed by experiment. By the high dielectric constant substrate and modified structure, the optimized device exhibits excellent dual- band filtering performances and small size. The size of the proposed filter can be reduced about 32.5% in comparing to the typical hairpin filters.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126638672","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}
引用次数: 5
Forest monitoring by using L-band coherence 基于l波段相干性的森林监测
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4555166
M. Watanabe, M. Sato, K. Ouchi, M. Shimada, Haipeng Wang
{"title":"Forest monitoring by using L-band coherence","authors":"M. Watanabe, M. Sato, K. Ouchi, M. Shimada, Haipeng Wang","doi":"10.1109/APMC.2007.4555166","DOIUrl":"https://doi.org/10.1109/APMC.2007.4555166","url":null,"abstract":"Two ALOS/PALSAR polarimetry data taken in 2006 were used and examined the deforestation stage by using coherence value. Many trees were fallen by a typhoon hit on September 8, 2004 at a test site in Japan. Reforestation has started for the deforestation sites and several kinds of deforestation stages are appeared there. We classified the stands into four groups. 1) Only small stumps and branches are left. 2) Tree trunks have been carried out, but branches and stumps have been left. 3) The fallen trees have been left. 4) No trees were fallen by the typhoon (normal forest). Coherence values of HH-HH and VV-VV become ~0.39 for group 1 and ~0.30 for group 4, and show a significant difference. But the coherence values of group 2, and group 3 are ~0.3 and show almost same value as group 1. The coherence value of HH-VV and VV-HH are 0.1 lower than the one of the HH-HH and W-VV. The coherence values, which include cross polarization, such as HV-HV and HV-VV, show no difference for all groups and the value is 0.2 to 0.3. While coherence values show the difference between group 1 and group 4, sigma0 HV shows wider dynamic range and is preferable to distinguish the deforested stands from forest stands.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126784007","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}
引用次数: 3
RF-MEMS Reconfigurable Filters on Low Loss Substrates for Flexible Front Ends 柔性前端低损耗基板上的RF-MEMS可重构滤波器
2007 Asia-Pacific Microwave Conference Pub Date : 2007-12-01 DOI: 10.1109/APMC.2007.4554997
P. Blondy, C. Palego, M. Houssini, A. Pothier, A. Crunteanu
{"title":"RF-MEMS Reconfigurable Filters on Low Loss Substrates for Flexible Front Ends","authors":"P. Blondy, C. Palego, M. Houssini, A. Pothier, A. Crunteanu","doi":"10.1109/APMC.2007.4554997","DOIUrl":"https://doi.org/10.1109/APMC.2007.4554997","url":null,"abstract":"Different examples of low loss, widely reconfigurable filters are shown. The first example concerns a 2 pole, tune all filter, built using five 3 bit switched varactors. The second example is about a 2 pole 2 bit switched filter built using appropriate distribution of switched capacitor along an hairpin resonator.","PeriodicalId":363454,"journal":{"name":"2007 Asia-Pacific Microwave Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115085269","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}
引用次数: 14
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