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A Novel Method for Designing Dual-Frequency Slot Patch Antennas with Two Polarizations WU Di1, OH ISH I BA SH I H idekazu2, SEO Kazuyuk i2, I NA GA K IN aok i3 (1. Department of Communication Engineering , Shang hai University , Shang hai 200072, China; 2. Kojima R D Center, Kojima Press Industrial Co Ltd , Aichi 470—0207, Japan; 3. Nagoya Institute of Technology, Nagoya 466—8555, Japan) Abstract: This paper presents a new method for designing a dual-frequency patch antenna with circular and linear polarizations. Dual-frequency operations are behaved by etching two narrow slots close to the radiating edges of a rectangular patch. The circular polarization at the lower resonant frequency of the dual-frequency antenna can be achieved by setting a perturbation segment at an appropriate location in the patch element, and placing the feed point on the diagonal axis. Several experimental results of a designed antenna show the good characteristics for circular and linear polarizations at both resonant frequencies. CLC number:TN821.1 Document code: A Key words: dual-frequency; slot patch antennas; linear polarization; circular polarization In radar and communication systems, dual-frequency operations are often required. Specially, in modern mobile global position system (GPS), it will be desirable that one of two frequencies is the circular polarization. Planar antenna has been investigated for multi-frequency very well since it is advantageous in low cost, low weight and conform ability. Early dual-frequency planar antenna is multilayered stacked-patch structure, and the radiating element is used to be circular[1], annular[2], rectangular[3]and triangular patches[4]. Recently, a dual-frequency antenna is introduced in which the structure is dingle layer patch with two slots close to the radiating edges, and good performances of simultaneous impedance matching and gain are demonstrated for both resonant frequencies. However, all the conventional investigations are
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