Dual-band Circularly Polarized Microstrip Patch Research Articles

A Planar Dual-Band and Dual-Sense Circularly Polarized Microstrip Patch Leaky-Wave Antenna

This letter presents a simple single-layered dual-band circularly polarized microstrip patch leaky-wave antenna (LWA). The proposed design consists of two linear circular patch arrays that are coupled to a 50 $\Omega$ microstrip line. While having high gain, the rotating sense in each band is opposite to each other, which makes the antenna concept well-suited for the uplink and downlink satellite communication. For demonstration, an antenna has been designed to operate at 5.0 and 8.0 GHz. It is noted that the concept can be easily adapted to other frequencies. With a total length of 2.89 $\lambda _0$ ( $\lambda _0$ is the free-space wavelength at 5.0 GHz), the antenna prototype achieves a satisfactory measured axial ratio (AR) with peak realized gains of approximately 12 and 13.6 dBi at 5.0 and 8.0 GHz, respectively.

A dual-band circularly polarized microstrip patch antenna with a cross shaped slot for 0.92/2.45 GHz RFID applications

A dual-band circularly polarized microstrip patch antenna with a cross shaped slot for 0.92/2.45 GHz RFID applications

Reconfigurable dual-band circularly polarized microstrip patch antenna for wireless applications

A new design of reconfigurable single-feed circular patch microstrip antenna for dual-band circular polarization application is proposed. The dual-band functionality is realized through incorporating cross-slots of equal slot length in the circular patch and utilizing two PIN diodes to switch the slots on or off. A pairs of tuning stubs are used to tune the circular polarization performance. The design process is presented and good results were obtained.

Analysis and design of a dual-band circularly polarized microstrip patch antenna

In the last decade a great effort has been made concerning research on frequency agility of microstrip patch antennas. In all these attempts an increase in length or height of the patch is generally expected and there is a tradeoff between wider bandwidth and good axial ratio. This paper presents the analysis and design of a novel dual-band circularly polarized microstrip patch antenna using a spur-line band-stop filter and a perturbation segment technique. This dual frequency operation can be obtained without increasing either the size or the thickness of the patch while other features are not degraded. >