| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 99 === A simple method for slot antenna miniaturization is proposed. By loading the L-shaped metal stub inside the slot antenna at proper position, both the electric current path and the effective shunt capacitance of the slot are increased and thus the slot, or the antenna effective length can be lengthened.
Using this method, four kinds of slot antennas including capacitively and inductively CPW-fed slot dipole antennas, microstrip-fed slot dipole, and slot monopole antenna can achieve the size reductions of about 47.2%, 53.8%, 46.2%, and 46.7%, respectively. Moreover, further miniaturization can be simply done by placing a lumped inductor at the input of the L-shaped stub, however more degradations on the antenna gain and bandwidth are its drawbacks.
All of the operating mechanism and details of the antenna design are discussed. Experimental and simulated results of the antenna characteristics are both presented and discussed.
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