DUAL-BAND CIRCULARLY POLARIZED ANTENNA BY LINE-COUPLING TO A PATCH AND A RING
碩士 === 大同大學 === 通訊工程研究所 === 104 === In this thesis, a dual-band circularly polarized (CP) antenna by line-coupling to a patch and a ring is presented. The structure of the antenna has three parts, the top of the structure is the FR4 substrate, the intermediate structure is the air layer, and the bot...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2016
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| Online Access: | http://ndltd.ncl.edu.tw/handle/38300586618323210098 |
| Summary: | 碩士 === 大同大學 === 通訊工程研究所 === 104 === In this thesis, a dual-band circularly polarized (CP) antenna by line-coupling to a patch and a ring is presented. The structure of the antenna has three parts, the top of the structure is the FR4 substrate, the intermediate structure is the air layer, and the bottom of the structure is the ground. A patch and a ring are etched on the upper surface of the FR4 substrate, or optionally, they can also be etched on the opposite sides of the substrate. The air layer is used to boost the gain of the antenna. The antenna can be applied to the global positioning system L1 and L2 bands.
Simulation and measurement results are similar. The antenna has 10 dB return loss bandwidth 350 MHz (1.51 GHz -1.86 GHz) at the L1 band and 50 MHz (1.2 GHz -1.25 GHz) at the L2 band. The antenna has a 3 dB axial-ratio bandwidth 46 MHz (1.542 GHz -1.588 GHz) at the L1 band and 12 MHz (1.218 GHz -1.23 GHz) at the L2 band. The boresight gains of the CP antenna at L1 band and L2 band are more than 7.5 dBic.
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