Title :
Small dual-frequency microstrip antennas
Author :
Gao, Shi-Chang ; Li, Le-Wei ; Yeo, Tat-Soon ; Leong, Mook-Seng
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore
fDate :
1/1/2002 12:00:00 AM
Abstract :
The characteristics of a dual-frequency compact antenna, which uses a rectangular microstrip patch with a shorting pin, are studied. Compared with the conventional rectangular patch antenna, this antenna can achieve both a significant reduction of antenna size and a dual-frequency operation with a single feed. A detailed parameter study is performed. The theoretical analysis is based on the finite-difference time-domain (FDTD) method. The FDTD codes are developed and validated by measurement results. One antenna has been designed and fabricated, and the comparisons between the measured results and the calculated results are provided. The effects of several antenna parameters on two resonant frequencies, frequency ratio, and radiation pattern characteristics of the antenna have been analyzed and compared. The results of the return loss are also presented. It is shown that various frequency ratios (2.82-4.23) can be obtained by varying the design parameters of this antenna. Several design curves are also presented
Keywords :
antenna radiation patterns; finite difference time-domain analysis; microstrip antennas; multifrequency antennas; FDTD codes; antenna parameters; antenna size reduction; design curves; design parameters; dual-frequency compact antenna; dual-frequency microstrip antennas; finite-difference time-domain method; frequency ratio; radiation pattern characteristics; rectangular microstrip patch; resonant frequencies; return loss; shorting pin; Antenna feeds; Antenna measurements; Dipole antennas; Finite difference methods; Loaded antennas; Microstrip antennas; Patch antennas; Resonance; Resonant frequency; Time domain analysis;
Journal_Title :
Vehicular Technology, IEEE Transactions on
