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In this paper, we present a method for the synthesis of multiple beams sparse array pattern based on the unitary matrix method (UMP). A Hankel block matrix is constructed from the sample data of the multiple beams pattern, we can obtain the corresponding excitation for each beam and the sparse array element position through the generalized value decomposition of the equivalent matrix pencil. The numerical...
The strip-fed wideband notched rectangular dielectric resonator antenna is investigated in this paper. By simultaneously exciting the TE111y and TE113y modes of the DRA, a wide impedance bandwidth of 56% can be obtained, which entirely covers the WLAN (2.4-2.48 GHz) and WiMAX (3.4-3.7 GHz) bands. The reflection coefficient, radiation patterns, antenna gain and efficiency of the antenna were studied...
A compact wideband circularly polarized (CP) cylindrical dielectric resonator antenna (DRA) with an underlaid 90° couplers is presented. The HEM11Δ (1<; Δ <;1) and HEM11Δ (1<; Δ <;2) modes of the cylindrical DRA are utilized to design the wideband CP DRA. The underlaid coupler is used to generate two quadrature signals, which are fed to two vertical excitation strips stuck on the side...
In this letter, a compact differential hollow dielectric resonator antenna (DRA) is investigated. The hollow DRA is fed by two identical conducting strips connected to the outputs of an underlaid 180° hybrid coupler (rat-race). With this compact configuration, loss of the feed network can be minimized and, thus, the differential gain can be made about the same as for the single-ended case. By using...
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