| Summary: | 碩士 === 逢甲大學 === 電機工程學系 === 102 === The purpose of this paper is to propose three dual-band dipole antennas. The first antenna is a coplanar-waveguide-fed dipole antenna for WLAN application in the bands of 2.45 and 5.85 GHz, with helix structure to reduce the antenna size. Some effects of many important parameters on the return loss and gain value of the proposed antenna have been investigated. The second antenna is a High-gain dual-band antenna for GSM system by the introducing of the frequency selective surface (FSS). The measured data show that the 10-dB bandwidths in the lower band 0.9 GHz and higher band 1.8 GHz are 310 MHz (35.8%) and 400 MHz (20.8%), respectively. With the introducing of the FSS, the antenna gain is enhanced from 4.41 to 7.10 dB in the higher bands. The third antenna is a combination of a ceramic antenna for GPS band and a dipole antenna for the bands of LTE, GSM, and WLAN. For GPS band, the polarization of radiation patterns is RHCP in the z direction with an antenna gain 2.59 dBic at 1.575 GHz. The dipole antenna provide dual-band operation, the lower band from 0.56 to 3.17 and the higher band from 4.02 to 5.99, which cover the bands of LTE, GSM, and WLAN.
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