Title :
Novel Dual-Frequency Design of Circular Microstrip Antenna with Compact Operation
Author_Institution :
Department of Electronic Communication Engineering, National Kaohsiung Institate of Marine Technology, Kaohsiung, Taiwan 811, R.O.C. Tel: +886-7-3617141 ext. 2303, Fax: +886-7-3658307, E-mail: lujh@ema.ee.nsysu.edu.tw
Abstract :
This article presents a new compact dual-frequency design of single-feed circular microstrip antennas with an offset circular slot placed close to the patch boundary. The obtained two operating frequencies are with orthogonal polarization planes and have a low frequency ratio of about 1.15 to 1.18. The two frequencies can also be much lower than the fundamental resonant frequency of a corresponding simple circular patch antenna without the offset slot. This behavior makes the proposed antenna with a reduced antenna size as compared to a simple circular patch antenna operated at either one of the two frequencies. Details of the antenna design and experimental results are presented.
Keywords :
Feeds; Impedance matching; Microstrip antennas; Mobile antennas; Patch antennas; Polarization; Probes; Resonance; Resonant frequency; Slot antennas;
Conference_Titel :
Microwave Conference, 1999. 29th European
Conference_Location :
Munich, Germany
DOI :
10.1109/EUMA.1999.338528
