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A dual-frequency L-shaped patch antenna

✍ Scribed by Jieh-Sen Kuo; Kin-Lu Wong

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
129 KB
Volume
27
Category
Article
ISSN
0895-2477

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✦ Synopsis

A no¨el design of an L-shaped patch antenna for dualfrequency operation is proposed. The proposed antenna is obtained by bending a planar rectangular patch into an L-shaped patch, which is then placed on a grounded substrate, with the patch's horizontal portion parallel to and abo¨e the substrate and the edge of the patch's ¨ertical portion in contact with the substrate. The proposed antenna is fed by a 50 ⍀ microstrip line printed on the same substrate, and the antenna's first two resonant frequencies can be excited with good impedance matching, and ha¨e the same polarization planes. Good broadside radiation characteristics for the two resonant frequencies are also obtained, and by inserting a pair of slits at the nonradiating edges of the patch's ¨ertical portion, the frequency ratio between the two resonant frequencies can be ¨aried, resulting in a dual-frequency operation ha¨ing a tunable frequency ratio of about 1.

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