Dual polarized wide-band stacked microstrip antenna with aperture coupling for SAR applications

Low-Profile Cavity-Backed Crossed-Slot Antenna With a Single-Probe Feed Designed for 2.34-GHz Satellite Radio Applications

“…The slots have a fractional length difference to produce circular polarization, so their lengths are (4) In general, in order to produce a 90 phase offset between two resonators, their frequencies should differ by one-half their natural bandwidth. This is not necessarily equal to, but is generally proportional to the input impedance bandwidth.…”

“…These have included both microstrip [1] and coplanar waveguide [2] feed methods. Other authors have studied multiple stacked patches using similar crossed-slot feeds, in which the slots appear either in the ground plane [3], [4] or inside one of the patches [5]. Still others have studied the case where the slots are within the patch itself, and circular polarization is produced either by adjusting the slot length, [6] the patch dimensions [7] or even the patch shape [8].…”

Design of a high isolation dual-polarized slot-coupled microstrip antenna

“…Two open-ended microstrip lines were placed on the same layer, resulting in isolation of about 18 dB. Another dual-polarized stacked patch antenna with crossslots, reported in [5], achieved isolation of better than 20 dB, but a complex multilayer structure was required. A dual-polarized microstrip-ring antenna with three coupling slots was introduced in [6], resulting in isolation of 30 dB with a cross-polarization level of Ϫ25 dB.…”

“…Among passive components, bandpass filters are extensively used for a variety of applications. Several researchers have studied the possibility of implementing laminated waveguide-based designs [1,2] in LTCC in order to realize new configurations of bandpass filters and multiplexers [3][4][5].…”

Wide-band microstrip antenna with an H-shaped coupling aperture

“…This problem is overcome in [11] and [12] by choosing the resonance of the aperture as far away from the operating band of the antenna as possible, so that its radiation level is small and the bandwidth is broadened by using stacked patches. Another way to reduce the backward radiation levels is to add a second ground plane under the feed circuit; however, this method will lead to a bulky structure [13]. The modification of the aperture shape can lead to an improved coupling level for the antenna.…”