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[1] A broadband 180°microstrip balun is employed as a feed network for the L-probe square patch antenna. The broadband balun delivers impedance matching, equal amplitude power division, and consistent 180°(±10°) phase shifting over a wide band ($45%). We demonstrate that the use of the 180°broadband balun affords significant H-plane cross-polarization suppression across the wide impedance bandwidth designed for L-probe patch antennas. The antenna using the 180°broadband balun exhibits a measured impedance bandwidth (SWR < 2) of 37.15%, from 1.6 to 2.33 GHz. Across our bandwidth of interest (1.7 to 2.3 GHz), the measured boresight gain ranges from 6.16 to 8.5 dBi, and the measured H-plane cross-polarization levels are consistently well suppressed (<À20 dB).

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Miniaturized multilayer ultrawideband monopole antennas on low temperature co-fired ceramic are presented. The antennas each compose of a radiator, ground plane, and transmission line on various layers. For testing purposes, a top layer feed strip is connected by a feed via to the embedded middle layer transmission line. The overall width of the antenna is reduced by folding both the radiator and ground plane. Additional metal patches connected by thru vias are used to fold both the radiator and ground plane, so as to maintain sufficiently long current paths. The impedance and radiation performances are studied and compared for the monopole antennas with single ground plane, double ground planes, and folded ground plane plus folded radiator.Index Terms-Low temperature co-fired ceramic (LTCC), multilayer, planar monopole, ultrawideband (UWB).