This paper presents an internal dual-band antenna which has a planar-type radiator and operates at the CDMA (824–894-MHz) and PCS (1750–1870-MHz) bands. The antenna characteristics at each band are optimized by tuning the size and length of the strip line's radiating segments. This antenna is composed of FR-4 substrate (thickness of 1 mm), a planar-type radiator, and 50Ω coaxial feeding cable. The maximum measured radiation gains are 0.94 and 1.89 dBi in the CDMA and PCS bands, respectively. The design of the proposed antenna and the experimental results are discussed.
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Hwang et al. (2005) studied this question.
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