A CPW-Fed Microstrip Fork-Shaped Antenna With Dual-Band Circular Polarization

Abstract

Abstract-This paper presents a microstrip wideband antenna and its utilization in integration of multiple wireless communication systems. A simple fork-like strip antenna, fed by a coplanar-waveguide (CPW) transmission line, is designed to excite a right-hand circularly polarized wave at 1.57 GHz. A rectangular patch is added at the end of one prong to enhance the circular polarization performance. By modifying the geometry of the ground plane, a left-hand circularly polarized wave is excited at 2.33 GHz, and the wideband frequency response is derived. To reduce the lower resonant frequency, a stub is added at the left side of the ground plane. The measured impedance bandwidth of reflection coefficients (S 11 ) < −10 dB ranges from 1.49 to 2.92 GHz, which satisfies the system bandwidths of most of commercial wireless communication systems. The 3-dB axial-ratio bandwidths are approximately 40 MHz at the lower band (1.57 GHz) and 290 MHz at the upper band (2.33 GHz).

Compact microstrip antennas with very wide ARBW and triple circularly polarized bands

“…Besides having a wide 3 dB ARBW sometimes, it is desirable to have an antenna with multiple circularly polarized (CP) bands for interference reduction between various frequency bands. Keeping this in mind, a variety of antenna designs having multiple CP bands were proposed in the available literature …”

“…Various novel techniques for getting multiple CP bands were proposed in Refs . In Ref , solid arcs and grounded tuning stub were used for achieving dual circularly polarized bands having 3 dB ARBW of 15.1% (2.15–2.6 GHz) and 4.1% (5.67–5.91 GHz), respectively.…”

“…In Ref , solid arcs and grounded tuning stub were used for achieving dual circularly polarized bands having 3 dB ARBW of 15.1% (2.15–2.6 GHz) and 4.1% (5.67–5.91 GHz), respectively. U‐shaped structures were used on patch and ground for achieving dual circularly polarized band having 3 dB ARBW of 19.5% (2.49–3.03 GHz) and 9.3% (3.58–3.93 GHz), respectively, in Ref , while a fork‐like antenna with a rectangular patch attached at the end of prong was used for getting 3 dB ARBW of 3.7% (1.56–1.6 GHz) and 13.3% (2.1–2.4 GHz) in Ref . In Ref , two eccentric rings were used as patch for getting dual circularly polarized bands at 2.1 and 2.6 GHz.…”

“…Keeping this in mind, a variety of antenna designs having multiple CP bands were proposed in the available literature. [15][16][17][18][19][20][21][22][23] In this article, a set of two compact antennas are being presented with the following features:…”