Single-feed dual-band circularly polarised microstripantenna

Abstract

A novel technique for obtaining dual-hand circular polarisation (CP) radiation of a single-feed circular microstrip antenna in proposed and demonstrated . By embedding two pain of arcshaped slots of proper lengths close to the boundary of a circular patch, and protniding one of the arc-shaped slots with a narrow slit, the circular micr(strip antenna can perform dual-hand Cl' radiation using a single probe feed. Details of the antenna design and experimental results are presented.Introduction: Dual-frequency operations of microstrip antennas have received much attention, and many related designs have also been reported [1]. However, the dual-frequency designs available in the literature are mainly for linear polarisation (LP) operation. Little attention has been given to the dual-hand circular polarisation (CP) design, especially for the case using a single probe feed. This is probably because single-feed dual-band CP design is more complicated than that required for dual-band LP design. The typical dual-band CP microstrip antennas that have been reported include design using an aperture-coupled stacked microstrip antenna [2] or a combination of the spur-line filter technique and a nearly square patch antenna [3]. In this Letter, we propose a novel and simple design method using a single-layer circular microstrip antenna to achieve single-feed dual-band CP operation. The proposed antenna can easily be implemented by embedding two pairs of arc-shaped slots, with one of the arc-shaped slots having a narrow radial protruding slot, close to the boundary of the circular patch. Details of the proposed antenna desigr are described, and experimental results for CP performance are presented and discussed.

A Circularly Polarized Antenna for Dual Band Operation at 2.45 GHZ and 5.10 GHZ

“…An effective strategy to obtain dual-band operation is based on the use of arc-shaped slots, firstly proposed in [14], and then further developed in [15], for antennas operating in CP.…”

“…While many designs for dual band patches can be found in literature [14,15], they typically suffer from the lack of an adequate number of parameters to successfully satisfy gain, polarization purity and matching requirements at the two operation frequencies. More effective solutions, such as the one proposed in [16], are based on a stacked structure, a solution which could potentially limit the antenna integration.…”

A Single-Feed Dual-Band Dual-Sense Circularly Polarized Microstrip Antenna

“…Coupling fed by a top-loaded circular disk [15], the antenna is etched on two substrates with an air layer. Compared with a single-feed microstrip antenna [16][17][18], the capacitive coupling feeding technique can effectively improve the impedance bandwidth. The obtained impedance bandwidths across the operating band of the proposed antenna are about 15.4% (2.28 GHz ∼ 2.66 GHz) and 5.0% (3.76 GHz ∼ 3.95 GHz), the 3-dB AR bandwidths are about 3.7% (2.36 GHz ∼ 2.45 GHz) and 1.9% (3.76 GHz ∼ 3.83 GHz), respectively.…”

Compact Dual-Band Circularly-Polarized Antenna With C-Slots for CNSS Application

“…In [7], although the frequency ratio can be reduced by an unequal cross-slot loaded in the ground plane, it leads bidirectional radiation patterns and besides adds to the disadvantage of integrated system at the same time. A square microstrip patch with T-shaped or Yshaped slots [8], or a circular patch loading two pairs of arc-shaped slots [9], can achieve good dual-band CP performance. However, their dimensions are still larger to meet the miniaturization requirements of portable mobile devices.…”