Abstract-This letter presents a dual band slot antenna with high gain for WLAN and WiMAX communication covering the IEEE802.11a/b and IEEE802.16d/e standards. The antenna consists of a microstrip fed slot with a complimentary stub on a single dielectric medium. A reflecting ground plane is employed to achieve a unidirectional radiation pattern with an average gain of 9.1 dBi. The feed of the antenna is optimized to achieve radiation efficiency above 95% in the WLAN and WiMAX frequency bands. The radiation properties of a prototype antenna were measured in a compact antenna range. Simulated and measured results (impedance bandwidth, gain and radiation patterns) are presented for the proposed antenna.Index Terms-Directive antennas, multiband antenna, slot antennas, wireless (local area network) LAN, WiMAX.
We introduce assumptions in input optimisation that simplify the necessary conditions for an optimal input. These assumptions, in the context of nonlinear programming, give rise to conceptually new kinds of constraint qualifications.
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