| Summary: | 碩士 === 龍華科技大學 === 電子工程系碩士班 === 104 === A novel quasi-horn antenna is presented that application to the LTE band. The antenna structure is the main radiator of monopole antenna. Through coupling the top of different directors or resonator to achieve the effect of different characteristics of the antenna.
The coupled resonators of the monopole antenna design for long-term evolution (LTE) applications are proposed. This antenna is designed on double levels printed circuit board (PCB) FR4 substrate with permittivity εr=4.4, loss tangent tanδ=0.0245, and thickness h1=1.6 mm on the lower level PCB and thickness h2=0.8 mm on the upper level PCB. The antenna consists of a monopole on the lower level PCB and F-shaped resonators on the upper level PCB. With the different parameters of the coupled resonators, simulated and experimental results of the proposed antenna are suitable for LTE operations. The -10 dB bandwidth of the proposed antennas from measurement is approximately 36.12 % (1.86-2.68 GHz). Two F-shaped resonators on the upper level PCB were used to produces an additional LTE band.
The results for reflected coefficient (S11), far-field H- and E-plane radiation patterns and gain of the proposed antennas are presented and discussed. The design antenna volume is 70×60×5.4 mm3. The measured results show a good agreement with the simulated results.
The second part of this thesis is presented to design a gain enhancement antenna. With placing a multiple directors on the top of monopole antenna, the power of the antenna pattern generate the concentration, directivity effects, and gain enhancement. Through the shift of the directors, the radiation pattern is changeable. Compare with conventional horn antennas, the proposed antenna has a low cost, and the effects of the radiation field have a good performance of gain enhancement.
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