Pub Date : 2016-12-01DOI: 10.1109/APMC.2016.7931449
Shaomeng Wang, S. Aditya
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.
{"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}
Pub Date : 2016-12-01DOI: 10.1109/APMC.2016.7931407
R. Yoshimura, Masaki Hara, T. Nishimura, C. Yamada, H. Shimasaki, Y. Kado, M. Ichida
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.
{"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}
Pub Date : 2016-12-01DOI: 10.1109/APMC.2016.7931397
V. K. Velidi, A. Subramanyam, V. Senthil Kumar, Y. Mehta, S. Sanyal
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.
{"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}
Pub Date : 2016-12-01DOI: 10.1109/APMC.2016.7931484
Nasimuddin, M. Karim, A. Alphones
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.
{"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}
Pub Date : 2016-12-01DOI: 10.1109/APMC.2016.7931286
R. Gupta, M. Parihar
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.
{"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}
Pub Date : 2016-12-01DOI: 10.1109/APMC.2016.7931455
M. Agarwal, M. K. Meshram
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.
提出了一种基于超材料的亚波长微波吸收体。该结构在2.82 GHz、6.93 GHz、9.74 GHz、10.60 GHz和14.13 GHz五个不同频率上谐振，吸光度分别为99.54%、74.93%、99.50%、99.79%和99.66%。所提出的吸收器的单元电池适合于12 mm × 12 mm × 1.6 mm的小体积。该结构对TE和TM极化波在60°入射角范围内具有良好的极化不敏感性能。利用表面电流分布和功率损耗密度图研究了该吸收剂的吸收现象。
{"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}
Pub Date : 2016-12-01DOI: 10.1109/APMC.2016.7931273
M. Nagasaka, S. Nakazawa, S. Tanaka, Takuma Torii, Shohei Imai, H. Utsumi, Masaki Kono, K. Yamanaka, H. Fukumoto
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.
在日本，2016年8月开始了超高清电视卫星广播试验，2018年将开始实际广播。测试广播是在ku波段(11.7至12.75 GHz)提供的，采用幅度和相移键控(APSK)调制方案。因此，鉴于卫星转发器非线性特性的要求，我们目前正在研究一种用于ku波段广播卫星的100w级SSPA。在这项研究中，我们制作了一个GaN驱动放大器(DA)和一个GaN高功率放大器(HPA)，两者都有二次谐波反射电路，以实现高效率。它们是在ku波段采用0.15µm GaN HEMT技术的高效率和高输出功率两级放大器。测量结果表明，在连续工作下，DA的功率附加效率(PAE)为40%，输出功率超过60 W, HPA的输出功率为100 W。
{"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}
Pub Date : 2016-12-01DOI: 10.1109/APMC.2016.7931275
Ramesh K. Gupta
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.
{"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}
Pub Date : 2016-12-01DOI: 10.1109/APMC.2016.7931364
S. Choudhury, A. Mohan
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.
{"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}
Pub Date : 2016-12-01DOI: 10.1109/APMC.2016.7931477
P. Hu, Y. Pan
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%.
{"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}
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