Abstract
By embedding a pair of properly-bent slots close to the nonradiating edges of a rectangular microstrip patch, two resonant modes [TM/sub 10/ and TM/sub /spl delta/0/ (1</spl delta/<2)] with the same polarization planes and similar radiation characteristics can be excited with good impedance matching for single-feed dual-frequency operation. Since such a design is with a low frequency ratio between the two operating frequencies, it is expected that broadband operation can also be obtained, if suitable slots other than that used by Wong and Sze (see Electron. Lett., vol.34, no.14, p.1368-70, 1998) are embedded in the patch. We present two different designs of the embedded slots that make possible a wide operating bandwidth of a rectangular microstrip antenna. Antenna designs and typical experimental results of the obtained broadband performances are described and discussed.
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