Title :
Single-feed dual-frequency microstrip antenna with two patches
Author :
Shan-Cheng Pan ; Wen-Hsiu Hsu
Author_Institution :
Dept. of Electron. Eng., Yung Ta Coll. of Technol., Taiwan, China
Abstract :
A variety of dual-frequency microstrip antennas have been previously reported. However, it is noted that these dual-frequency designs usually support limited tunable frequency ratios for the two operating frequencies. To provide a very flexible frequency ratio for a single-feed dual-frequency microstrip antenna, the design with two circular patches has also been shown. Such a design, however, uses a relatively complicated matching network between the two patches. We present a new structure of using an inset-microstrip line to simplify the matching network, which makes the present proposed design simpler and easier to be constructed. The proposed design method applied to two rectangular patches has been successfully implemented. The obtained frequency ratio of the two operating frequencies can be flexible, and good dual-frequency performances are also observed. Details of the antenna design and experimental results are presented and discussed.
Keywords :
UHF antennas; antenna feeds; antenna radiation patterns; impedance matching; microstrip antennas; microstrip lines; multifrequency antennas; tuning; 1872 MHz; 2208 MHz; UHF; antenna design; design method; experimental results; inset-microstrip line; matching network; measured radiation pattern; operating frequencies; rectangular patches; return loss; single-feed dual-frequency microstrip antenna; tunable frequency ratio; Antenna radiation patterns; Business; Design methodology; Educational institutions; Feeds; Geometry; Impedance matching; Microstrip antennas; Resonance; Resonant frequency;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1999. IEEE
Conference_Location :
Orlando, FL, USA
Print_ISBN :
0-7803-5639-x
DOI :
10.1109/APS.1999.788268
