Compact and Broadband Antenna Using Monopoles and Transitions Using Resonators
碩士 === 國立臺灣科技大學 === 電子工程系 === 102 === In this discourse, three compact and broadband microwave components are developed, which include the microstrip-fed antenna using two unsymmetrical monopoles and L-shaped ground, microstrip line-to-rectangular waveguide transition using semi-circle and ground re...
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ndltd-TW-102NTUS54280672016-03-09T04:30:57Z http://ndltd.ncl.edu.tw/handle/50526959817812634516 Compact and Broadband Antenna Using Monopoles and Transitions Using Resonators 微小且寬頻的多極天線及多共振轉接 Yuan-Chun Lee 李元鈞 碩士 國立臺灣科技大學 電子工程系 102 In this discourse, three compact and broadband microwave components are developed, which include the microstrip-fed antenna using two unsymmetrical monopoles and L-shaped ground, microstrip line-to-rectangular waveguide transition using semi-circle and ground resonators, and rectangular waveguide-to-circular waveguide transition using semi-circle and ground resonators. First of all, a compact (25×15×0.8 mm3) and UWB (3.1 to 10.6 GHz) microstrip-fed antenna using two unsymmetrical monopoles and L-shaped ground is proposed. By properly selecting the resonance lengths of three monopoles, an ultra wide band performance can be achieved. The frequency range for which the reflection coefficient is less than -10 dB covers from 3.2 GHz to 10.6 GHz (105.7%), covering the whole UWB. Also, the antenna maintains an omni-directional radiation pattern for both the E-plane and H-plane. Furthermore, the antenna provides averagely more than 80% efficiency and its gain varies from 1.3 dBi to 3.27 dBi. Secondly, a compact and broadband microstrip line-to-rectangular waveguide transition using the semi-circle and ground resonators is proposed. The bandwidth for which the reflection coefficient is smaller than -15 dB covers the frequency range from 8.2 GHz to 12.6 GHz, which is estimated to be 42.7 %. The corresponding transmission coefficient in this frequency range is larger than -0.18 dB. As compared with the microstrip line-to-rectangular waveguide transition using the antisymmetric tapered probe [23], the circuit size is greatly reduced from 400 to 250 mil while the broadband response is maintained. Thirdly, a compact and broadband rectangular waveguide-to-circular waveguide transition using the semi-circle and ground resonators is proposed. The bandwidth for which the reflection coefficient is smaller than -15 dB covers from 9.3 GHz to 11.75 GHz, estimating to be 23.8%, while the corresponding transmission coefficient in this frequency range is larger than -0.05 dB. As compared with the rectangular waveguide-to-circular waveguide transition using various techniques [29]-[32], the mechanical complexity is reduced while the compact size and the broadband response are maintained. In order to verify our design, a microstrip-fed antenna, one back-to-back MSL-to-RWG circuit, and one back-to-back RWG-to-CWG circuit are fabricated and measured where the measurement results are in good agreement with the simulation results. Chun-Long Wang 王蒼容 2014 學位論文 ; thesis 152 en_US |
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碩士 === 國立臺灣科技大學 === 電子工程系 === 102 === In this discourse, three compact and broadband microwave components are developed, which include the microstrip-fed antenna using two unsymmetrical monopoles and L-shaped ground, microstrip line-to-rectangular waveguide transition using semi-circle and ground resonators, and rectangular waveguide-to-circular waveguide transition using semi-circle and ground resonators.
First of all, a compact (25×15×0.8 mm3) and UWB (3.1 to 10.6 GHz) microstrip-fed antenna using two unsymmetrical monopoles and L-shaped ground is proposed. By properly selecting the resonance lengths of three monopoles, an ultra wide band performance can be achieved. The frequency range for which the reflection coefficient is less than -10 dB covers from 3.2 GHz to 10.6 GHz (105.7%), covering the whole UWB. Also, the antenna maintains an omni-directional radiation pattern for both the E-plane and H-plane. Furthermore, the antenna provides averagely more than 80% efficiency and its gain varies from 1.3 dBi to 3.27 dBi.
Secondly, a compact and broadband microstrip line-to-rectangular waveguide transition using the semi-circle and ground resonators is proposed. The bandwidth for which the reflection coefficient is smaller than -15 dB covers the frequency range from 8.2 GHz to 12.6 GHz, which is estimated to be 42.7 %. The corresponding transmission coefficient in this frequency range is larger than -0.18 dB. As compared with the microstrip line-to-rectangular waveguide transition using the antisymmetric tapered probe [23], the circuit size is greatly reduced from 400 to 250 mil while the broadband response is maintained.
Thirdly, a compact and broadband rectangular waveguide-to-circular waveguide transition using the semi-circle and ground resonators is proposed. The bandwidth for which the reflection coefficient is smaller than -15 dB covers from 9.3 GHz to 11.75 GHz, estimating to be 23.8%, while the corresponding transmission coefficient in this frequency range is larger than -0.05 dB. As compared with the rectangular waveguide-to-circular waveguide transition using various techniques [29]-[32], the mechanical complexity is reduced while the compact size and the broadband response are maintained.
In order to verify our design, a microstrip-fed antenna, one back-to-back MSL-to-RWG circuit, and one back-to-back RWG-to-CWG circuit are fabricated and measured where the measurement results are in good agreement with the simulation results.
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author2 |
Chun-Long Wang |
author_facet |
Chun-Long Wang Yuan-Chun Lee 李元鈞 |
author |
Yuan-Chun Lee 李元鈞 |
spellingShingle |
Yuan-Chun Lee 李元鈞 Compact and Broadband Antenna Using Monopoles and Transitions Using Resonators |
author_sort |
Yuan-Chun Lee |
title |
Compact and Broadband Antenna Using Monopoles and Transitions Using Resonators |
title_short |
Compact and Broadband Antenna Using Monopoles and Transitions Using Resonators |
title_full |
Compact and Broadband Antenna Using Monopoles and Transitions Using Resonators |
title_fullStr |
Compact and Broadband Antenna Using Monopoles and Transitions Using Resonators |
title_full_unstemmed |
Compact and Broadband Antenna Using Monopoles and Transitions Using Resonators |
title_sort |
compact and broadband antenna using monopoles and transitions using resonators |
publishDate |
2014 |
url |
http://ndltd.ncl.edu.tw/handle/50526959817812634516 |
work_keys_str_mv |
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1718201780001570816 |