Dielectric loaded microstrip patch antenna

Details Dielectric loaded microstrip patch antenna Dielectric loaded microstrip patch antenna

H - Electricity

01

Q

H01Q 1/38 (2006.01) H01Q 5/00 (2006.01) H01Q 9/04 (2006.01)

Patent

CA 2257526

A dielectric loaded microstrip patch antenna is provided to deliver relatively wide operational bandwidth dual-band, with relatively good isolation and flexibility for circular polarization, while having a compact design and light weight to suit mobile and wireless applications. The disclosed invention allows for (a) an antenna size reduction for a given operating frequency, (b) an enhancement of operational bandwidth, (c) dual-band and dual polarization operations. The invention operates on the principle that by properly loading a patch, its resonating frequency and its quality factor (Q) can be modified. The loading can be achieved using dielectric strips strategically placed under the patch. A preferred embodiment consists of a conducting patch with an air dielectric layer over a ground plane, dielectric strips, .epsilon.r1 and .epsilon.r2, and a feed network. The antenna operating frequency is controlled by the dielectric permittivity, dimensions and locations of the strips er1. The maximum effect occurs at the location where the electric field is maximum. The ere strip is used to perform a function of matching the antenna to a feed network. Alternative embodiments may utilize a probe or a direct-coupled feed. The number of dielectric strips used, their placement and the method of excitation are determined by the intended operation of the antenna.

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