In this work; the novel design of dumbbell shaped frequency selective surface (FSS) is demonstrated as superstrate. The array of this designed FSS structure is incorporated on two different antennas; (1) Microstrip Patch Antenna (MPA), and (2) Inverted Stacked Microstrip Patch Antenna (ISMPA). The FSS unit cell reflection magnitude is nearly 0.95 in the vicinity of both antennas resonance frequencies. Based on the ray tracing phenomenon multiple reflections occur between superstate and ground plane. So by this phenomenon the gain of circular patch and the ISMPA is enhanced by 6.02 dBic and 5.1 dBic respectively. In the measured results, the impedance bandwidth of MPA and ISMPA are 6.66% (5.8-6.2 GHz) at 6 GHz center frequency and 5.3%
A simple design for triple-band circularly polarized (CP) wide slot antennas is proposed and experimentally investigated. The proposed antenna having a microstrip-fed rectangular patch with T-shaped notch for triple-band operation and a modified wide square slot on ground plane for CP operation. The measured 10 dB reflection bandwidths are 1.24% (≈340 MHz from 2.56 to 2.9 GHz), 9.63% (≈430 MHz from 4.25 to 4.68 GHz), and 5.34% (≈490 MHz from 8.93 to 9.42 GHz). The generated 3 dB axial ratio bandwidths of the proposed antenna are 7.54, 8.98, and 1.65% at operating frequencies around 2.65, 4.45, and 9.09 GHz, respectively. The measured peak gains within the 3 dB axial ratio bands are 3.03, 3.5, and 5.64 dBi. The simulated and measured results for the return loss, axial ratio, and antenna gain show a good agreement, which validate the antenna design.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.