| Summary: | 碩士 === 國立臺北科技大學 === 電子工程系研究所 === 103 === This paper has studied the dual-band stepped impedance resonator filtering antenna for LTE which is formed by two different types of SIR (Type-A and Type-B). Two types of stepped impedance resonators have been designed to have different fundamental resonant frequencies, one for the lower passband and the other for the upper passband.
The lengths of Type-A and Type-B SIRs are different such that their resonant frequencies are different. At the lower band (830MHz), during the Type-A is under resonance when the Type-B stays away from resonance and the filter works coupling network for Type-A SIR. On the other hand, at the upper band (2600MHz), Type-B resonates when the Type-A SIR acts as inter-coupling component between both Type-B SIRs.
The dual-band monopole antenna is designed by microstrip and the operation bands for LTE are band7 and band20. Because of the limitation of the PCB area, the microstrip of lower band should be bent without the impedance quality shift. In order to increase the bandwidth of the lower band bandwidth, another monopole microstrip antenna was added to resolve this problem. By tuning antenna impedance match to make sure the dual-band antenna has the best performance.
The PCB combined filter and monopole antenna were adjusted to match each other. The design of the PCB area is only 55x40 mm2. In conclusion, the theorem and framework of modeling, also the comparisons of simulation and measurement results, will be presented in the contents of this paper.
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