A Quarter-Wavelength Shorted Microstrip Antenna with a Slot for Dual-Frequency Operation (Special Issue on Microwave and Millimeter Wave Technology)

概要

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A novel dual-band internal antenna similar in size to the single-band internal antenna for cellular handsets is proposed. Our approach to realize a small and low-profile dual-band internal antenna is to use the dominant mode (TM_<10> mode) and the higher-order mode (TM_<30> mode). In order to use this approach for recent dual-band cellular systems it is necessary to lower the resonant frequency of the higher-order mode (TM_<30> mode). This motivated our development of a new antenna configuration with a slot on the radiation element of a quarter-wavelength shorted microstrip antenna to lower the resonant frequency of the TM_<30> mode. In this paper, the experimental and the analytical results for this antenna are presented. In the results, by adjusting the location and the length of the slot, the dual-frequency operation can be achieved with the frequency ratio (TM_<30> mode/TM_<10> mode) from 2 to 3. In addition, the enhancement of bandwidth is presented.
一般社団法人電子情報通信学会の論文
1999-07-25