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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/68816

    Title: 可獨立開關之四頻天線;Independently Switchable Quad-band Antennas
    Authors: 王登胤;Wang,Deng-Yin
    Contributors: 電機工程學系
    Keywords: 可開關;多頻天線;寬頻天線;四頻天線;switchable;multiband antenna;broadband antenna;quadband antenna
    Date: 2015-07-27
    Issue Date: 2015-09-23 14:40:15 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本論文中,利用在步階式阻抗共振器(Stepped-impedance resonator, SIR)末端加上二極體負載製作成可開關式的帶通濾波器,並在濾波器輸出端接上寬頻天線(Broadband Antenna),形成可開關之四頻天線。負載的二極體可改變步階式阻抗共振器共振條件。由於散佈式耦合的饋入技術的低負載效應,因此不需要複雜的匹配網路來設計多頻帶的電路。



    ;In this thesis, we made switchable bandpass filters by adding diodes to the end of Stepped-impedance resonator (SIR). Then we combined broadband antennas to the output port of bandpass filters to form switchable quad-band antennas. As we switching the loading diodes, the resonance condition of SIRs would be changed. By low loading effect of distributed fed-in technique, there is no need to design complex matching network for multiband circuits.

    Quad-band bandpass filters include quarter-wavelength and half-wavelength SIRs. Each passband is controlled by one pair of resonators and it will increase the degree of freedom to design. By the low loading effect of distributed coupling between passbands,four bandpass filters could be combine together, and the diodes at the end of resonators could perfume the switchable independently device.

    Broadband antennas were built on microstrip line structure. The monopole radiator is a half-wavelength SIR. It performs a wide passband by pull down the harmonic frequencies, and it has linear polarization characteristics. We can implement multiband antennas by adding bandpass filters on the input port of antennas to make the passband selection.

    We will perform experience on two kinds of substrates which have different relative dielectric constants and loss tangent values in this thesis. We will also compare the switchable antennas with passive ones. Finally we will identify our research by performing full-wave EM simulation and implement measurement.
    Appears in Collections:[電機工程研究所] 博碩士論文

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