| Summary: | 碩士 === 明志科技大學 === 電機工程研究所 === 100 === The three antennas which are applied to different applications are proposed in this paper. The first antenna, asymmetric dipole antenna, used a flexible maternal with dielectric constant of 2.8, and suited to Digital Video Broadcasting(470-862MHz) applications. Its advantage of the substrate material is pliant and it can freely adjust the usage of space limitations. The second antenna is a coupling monopole antenna with a size of 50(W)*100(L)*0.8(H) mm^3, which is printed on a inexpensive FR4 substrate with 0.8mm-thick. This antenna is suited to eight-band operation involving LTE(700/2300/2500),GSM(850/900/1800/1900),and UMTS(1920-2170MHz). Two antennas, as mentioned above, the return losses of them can fully reach the generally commercial. The third antenna is a planar monopole antenna which is applied to wireless communication protocol WLAN(2.4/5.2/5.8GHz) bands and WiMAX (2.5/5GHz) bands. The antenna is occupied 20(W)*450(L)*0.8(H) mm^3 and printed on a 0.8 mm-thick FR4 substrate. The return loss of the antenna is totally below -10dB and its operation bands are achieved 2.4-2.58GHz and 5-6GHz. The three antennas are measured by network analyzer and experimented in the anechoic laboratory. The return loss and the simulation results are reached good agreements. And the radiation pattern can meet the requirements of the omni-directional. So, they can become the good candidates for different areas of wireless communications antenna.
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