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Effects of chip resistor loading on the bandwidth and efficiency of a rectangular microstrip antenna (RMSA) have been investigated. A single chip-resistor-loaded RMSA gives broadband dual-frequency operation with broadside radiation. An RMSA with two chip resistors placed symmetrically about the feed point gives a conical radiation pattern besides being compact and broadband. The antennas have been analyzed using a multiport network model (MNM), followed by experimental verifications.
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Srinivasan et al. (2000) studied this question.
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