Dual-band circularly polarized antenna with a QUAD-EMC structure

• Published in: Microwave and optical technology letters Vol. 49; no. 3; pp. 645 - 647
• Main Authors: Chang, The-Nan, Ni, Guo-Yang
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 01.03.2007
• Subjects: Antennas; Circularity; circularly polarized; Corners; dual band; Gain; Microwaves; Patch antennas; QUAD-EMC; Substrates; Tuning
• ISSN: 0895-2477; 1098-2760
• DOI: 10.1002/mop.22231

In this paper, a method for obtaining a single‐feed dual‐band circularly polarized (CP) antenna with QUAD‐EMC structure is presented. The proposed dual‐band CP design was achieved by four small patches displayed on the upper surface of a first substrate, and fed electromagnetically by a large patch etched on the lower surface of the same substrate. A second FR4 and a third air substrate were added behind the first substrate to enhance the gain of the antenna. Then, by tuning the sizes of upper and lower patches and truncating patch corners respectively and properly, the proposed antenna can perform dual‐band CP radiation using a single probe feed. Prototypes of the proposed antennas designed for RFID operations in the 915‐MHz and 2.45‐GHz bands are presented and experimentally demonstrated. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 645–647, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22231