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Wideband power combining of Ka-band microfabricated traveling wave tubes ka波段微加工行波管的宽带功率组合
2016 Asia-Pacific Microwave Conference (APMC) Pub Date : 2016-12-01 DOI: 10.1109/APMC.2016.7931449
Shaomeng Wang, S. Aditya
{"title":"Wideband power combining of Ka-band microfabricated traveling wave tubes","authors":"Shaomeng Wang, S. Aditya","doi":"10.1109/APMC.2016.7931449","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931449","url":null,"abstract":"Wideband power combining of two Ka-band traveling wave tubes (TWTs) is reported. The TWTs are based on a configuration of planar helix slow-wave structure (SWS) with straight-edge connections (PH-SEC) that can be microfabricated. WR-28 waveguides are used as the input and output ports. A wideband transition between waveguide and PH-SEC enables wideband power division and power combining. Transient simulations of two 150-period SWSs with waveguide power divider and combiner show that in the frequency range 26.5 GHz ∼ 35.5 GHz, S11 is less than −20 dB and S21 is better than − 5.5 dB. Using two 3.7 KV and 10 mA electron beams, the PIC simulation results show that the gain can reach 31 dB at 30 GHz, with a 3-dB bandwidth of 23 % centered at 30.5 GHz.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114814271","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
Effect of vegetation on radio wave propagation in 920-MHz and 2.4-GHz bands 植被对920-MHz和2.4 ghz波段无线电波传播的影响
2016 Asia-Pacific Microwave Conference (APMC) Pub Date : 2016-12-01 DOI: 10.1109/APMC.2016.7931407
R. Yoshimura, Masaki Hara, T. Nishimura, C. Yamada, H. Shimasaki, Y. Kado, M. Ichida
{"title":"Effect of vegetation on radio wave propagation in 920-MHz and 2.4-GHz bands","authors":"R. Yoshimura, Masaki Hara, T. Nishimura, C. Yamada, H. Shimasaki, Y. Kado, M. Ichida","doi":"10.1109/APMC.2016.7931407","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931407","url":null,"abstract":"Collecting data of propagation losses in farm fields is important to design a wireless network in a farm. They are used in calculating the link budget to establish a proper and efficient node arrangement. In this study, propagation losses in a 50 × 50 m mulberry field were measured in 920-MHz and 2.4-GHz bands. Received signal strength indicators (RSSIs) were measured as a function of the distance and the angle between the propagation direction and the ridges (bush arrays). The data were converted to the vegetation attenuations and the propagation characteristics were compared in both bands. The antennas were placed at a height of 1.5 m. The height of the bush was 1.5 – 3.5 m. Moreover, the horizontal and vertical polarizations were measured and the differences were shown.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126354208","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: 6
Compact harmonic suppression branch-line coupler using signal-interference technique 采用信号干扰技术的紧凑型谐波抑制支路耦合器
2016 Asia-Pacific Microwave Conference (APMC) Pub Date : 2016-12-01 DOI: 10.1109/APMC.2016.7931397
V. K. Velidi, A. Subramanyam, V. Senthil Kumar, Y. Mehta, S. Sanyal
{"title":"Compact harmonic suppression branch-line coupler using signal-interference technique","authors":"V. K. Velidi, A. Subramanyam, V. Senthil Kumar, Y. Mehta, S. Sanyal","doi":"10.1109/APMC.2016.7931397","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931397","url":null,"abstract":"A novel application of signal-interference technique to branch-line coupler design is proposed for miniaturization and wideband harmonic passband suppression. The coupler's second, third and fourth harmonic passband responses are attenuated due to a pole at each of these harmonics. Design equations and graphs are provided using lossless transmission line model. A prototype coupler, having a compact (λg/6)2 area, that is 44.4% of the (λg/4)2 conventional coupler area, is fabricated in microstrip form for validation purposes. The input matching, isolation, amplitude and phase balance bandwidths of the proposed coupler are comparable to those of the conventional coupler.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125986248","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
A low-profile dual-band circularly polarized GPS antenna 一个低调的双频圆极化GPS天线
2016 Asia-Pacific Microwave Conference (APMC) Pub Date : 2016-12-01 DOI: 10.1109/APMC.2016.7931484
Nasimuddin, M. Karim, A. Alphones
{"title":"A low-profile dual-band circularly polarized GPS antenna","authors":"Nasimuddin, M. Karim, A. Alphones","doi":"10.1109/APMC.2016.7931484","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931484","url":null,"abstract":"A low-profile, dual-band, wide-beam circularly polarized (CP) stacked antenna is proposed for global positioning system (GPS) and vehicle applications. Antenna's configuration consists of stacked unequal circular-patches integrated-microstrip radiators with a coaxial feed. The dual-band CP radiation is achieved by integrated unequal circular-patches at the corners of lower and upper square microstrip radiators. The measured performance of the dual-band antenna shows wide coverage CP radiation with a gain of more than 5.0 dBic in both L1 (1.575 GHz) and L2 (1.227 GHz) bands. The proposed antenna is low-profile with size of 0.307λ0×0.307λ0×0.0196λ0 at 1.227 GHz.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121459615","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 singly-fed differential dielectric resonator antenna for broadband applications 宽带应用的单馈差分介质谐振器天线
2016 Asia-Pacific Microwave Conference (APMC) Pub Date : 2016-12-01 DOI: 10.1109/APMC.2016.7931286
R. Gupta, M. Parihar
{"title":"A singly-fed differential dielectric resonator antenna for broadband applications","authors":"R. Gupta, M. Parihar","doi":"10.1109/APMC.2016.7931286","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931286","url":null,"abstract":"A differentially excited rectangular dielectric resonator antenna (RDRA) is proposed. The RDRA is excited with two equal magnitude signals with 18° out of phase. A well accepted hybrid coupler is designed on the same substrate and integrated with the RDRA. The RDRA able to achieve an optimum impedance bandwidth of 33.6% at center frequency of 2.76 GHz with this proposed feeding arrangement. The proposed feeding arrangement also provides a control over the impedance bandwidth. A detailed parametric variation is presented. The RDRA shows a stable radiation pattern with a steady gain of 6∼7.2dBi in the broadside direction over the frequency band of interest.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121628489","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: 1
A subwavelength microwave absorber with five resonating modes 具有五种谐振模式的亚波长微波吸收器
2016 Asia-Pacific Microwave Conference (APMC) Pub Date : 2016-12-01 DOI: 10.1109/APMC.2016.7931455
M. Agarwal, M. K. Meshram
{"title":"A subwavelength microwave absorber with five resonating modes","authors":"M. Agarwal, M. K. Meshram","doi":"10.1109/APMC.2016.7931455","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931455","url":null,"abstract":"A metamaterial based subwavelength microwave absorber is presented in this paper. The proposed structure is resonating at five distinctive frequencies of 2.82 GHz, 6.93 GHz, 9.74 GHz, 10.60 GHz, and 14.13 GHz with 99.54 %, 74.93 %, 99.50 %, 99.79 %, and 99.66 % absorptivity, respectively. The unit cell of the proposed absorber fits in a small volume of 12 mm × 12 mm × 1.6 mm. The proposed structure is polarization insensitive and performs well up to an incidence angle of 60° for TE and TM polarized wave. The absorption phenomenon of the proposed absorber is investigated by surface current distribution and power loss density plots.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"38 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113937792","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 Ku-band 100 W power amplifier under CW operation utilizing 0.15 µm GaN HEMT technology 采用0.15µm GaN HEMT技术的ku波段连续工作100w功率放大器
2016 Asia-Pacific Microwave Conference (APMC) Pub Date : 2016-12-01 DOI: 10.1109/APMC.2016.7931273
M. Nagasaka, S. Nakazawa, S. Tanaka, Takuma Torii, Shohei Imai, H. Utsumi, Masaki Kono, K. Yamanaka, H. Fukumoto
{"title":"A Ku-band 100 W power amplifier under CW operation utilizing 0.15 µm GaN HEMT technology","authors":"M. Nagasaka, S. Nakazawa, S. Tanaka, Takuma Torii, Shohei Imai, H. Utsumi, Masaki Kono, K. Yamanaka, H. Fukumoto","doi":"10.1109/APMC.2016.7931273","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931273","url":null,"abstract":"In Japan, test satellite broadcasting of UHDTV started in August 2016 and practical broadcasting will begin in 2018. The test broadcasting is being provided in Ku-band (11.7 to 12.75 GHz) with a modulation scheme of amplitude and phase shift keying (APSK). Therefore, due to demands for non-linear characteristics in satellite transponders, we are now studying a 100-W class SSPA for a broadcasting satellite in Ku-band. In this study, we fabricated a GaN driver amplifier (DA) and a GaN high power amplifier (HPA) that both have a second harmonic reflection circuit to achieve high efficiency. They are high efficiency and high output power two-stage amplifiers using 0.15 µm GaN HEMT technology in Ku-band. Measured results showed that the DA achieved power added efficiency (PAE) of 40 % and output power exceeding 60 W under CW operation and that the HPA delivered output power of 100 W.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132238679","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
Communications Satellite RF payload technologies evolution: A system perspective 通信卫星射频有效载荷技术演变:系统视角
2016 Asia-Pacific Microwave Conference (APMC) Pub Date : 2016-12-01 DOI: 10.1109/APMC.2016.7931275
Ramesh K. Gupta
{"title":"Communications Satellite RF payload technologies evolution: A system perspective","authors":"Ramesh K. Gupta","doi":"10.1109/APMC.2016.7931275","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931275","url":null,"abstract":"This paper addresses the evolution of microwave and RF technologies for communications satellite payloads that have contributed to the deployment of flexible payload architectures resulting in efficient use of critical satellite power and bandwidth resources. These technologies have made relatively complex space based systems feasible thus offering fixed and mobile satellite services, and have also resulted in satellite payload size/weight reductions, reliability enhancements, and significant performance improvements. Innovations in active and passive RF subsystems, including on-board microwave switches, signal channelization and routing technology, narrow spot beam operation with re-configurability, have resulted in satellite network operational flexibility, frequency reuse, capacity enhancements, and use of smaller and lower cost terminals.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130180150","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
MiNiaturized Quarter-Mode Substrate Integrated Waveguide (QMSIW) antenna using Sierpinski fractal geometry 基于Sierpinski分形几何的小型化四分之一模基板集成波导(QMSIW)天线
2016 Asia-Pacific Microwave Conference (APMC) Pub Date : 2016-12-01 DOI: 10.1109/APMC.2016.7931364
S. Choudhury, A. Mohan
{"title":"MiNiaturized Quarter-Mode Substrate Integrated Waveguide (QMSIW) antenna using Sierpinski fractal geometry","authors":"S. Choudhury, A. Mohan","doi":"10.1109/APMC.2016.7931364","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931364","url":null,"abstract":"A planar Sierpinski fractal on a Quarter Mode Substrate Integrated Waveguide (QMSIW) antenna is proposed in this paper. The designed antenna has an overall dimension of 35 × 40 mm2. The QMSIW is obtained by bisecting the Half Mode Substrate Integrated Waveguide (HMSIW) along the fictitious quasi-magnetic wall while maintaining similar performance characteristics. Two stages of Sierpinski fractals have been introduced and their effects in the frequency reduction have been investigated. Fractal structures increase the effective current path leading to miniaturization of antennas. Rectangular slots have been cut on the ground plane to perturb the electric field for further miniaturization. The QMSIW antenna with second stage of Sierpinski fractal has been designed, fabricated and measured. The measured and simulated results match closely.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129371125","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
Wideband metasurface-based antenna with enhanced gain 增强增益的宽带超表面天线
2016 Asia-Pacific Microwave Conference (APMC) Pub Date : 2016-12-01 DOI: 10.1109/APMC.2016.7931477
P. Hu, Y. Pan
{"title":"Wideband metasurface-based antenna with enhanced gain","authors":"P. Hu, Y. Pan","doi":"10.1109/APMC.2016.7931477","DOIUrl":"https://doi.org/10.1109/APMC.2016.7931477","url":null,"abstract":"A low profile, wideband and high gain metasurface (MS) based antenna is investigated in this paper. The MS consists of 4×4 metallic patch cells and it is fed by two parallel microstrip-coupled slots. A substrate with lower relative permittivity is used to fabricate the MS, which enhances the average gain from previous 9 dBi to 9.9 dBi. On the other hand, the two coupling slots perturb current distributions on the MS, and also shift its resonant modes up to higher frequency band which effectively enlarges overall area of the radiating MS. As a result, the average gain is further enhanced from 9.9 dBi (using single-slot) to 12.4 dBi. Compared to the gain of original design, an increment of 3.4 dB is achieved. The proposed MS-based antenna still maintains a low profile of ‼0.06μ0 and has a wide bandwidth of 20%.","PeriodicalId":166478,"journal":{"name":"2016 Asia-Pacific Microwave Conference (APMC)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132876353","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
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