Miniaturised ultra‐wideband circularly polarised antenna with modified ground plane

Abstract

A unique coplanar-waveguide (CPW)-fed circularly polarised square slot antenna with enhanced impedance bandwidth (IBW) is presented. The antenna structure includes a pair of rectangular-shaped notches located at two opposite corners of the slot for achieving a significantly enhanced IBW of 12.06 GHz (2.76-14.82 GHz), and a pair of reverse L-shaped ground arms in the slot for realising circularly polarised radiation with 1.86 GHz (4.27-6.13 GHz) bandwidth. This proposed technique has the advantages of covering the whole of the ultra-wideband spectrum (3.1-10.6 GHz), an average gain of 3 dBi and a reduced antenna size of 25 × 25 × 0.8 mm 3 .

Analysis of wideband circularly polarized ring slot antenna using characteristics mode for bandwidth enhancement

“…The asymmetry in the square ring slot antennas can be used to achieve circular polarization . For instance in Ref.…”

Broadband Circularly Polarized Cross Shaped Slot Antenna With an Improved Feedline

“…The use of circularly polarized (CP) antennas [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] has gained much momentum in the wireless engineering community due to their ability to suppress multipath fading and doing away with the need for arranging the orientation of transmit and receive antennas. Also, CP antennas provide better mobility and immunity to adverse weather conditions than linearly polarized antennas.…”

“…Such perturbations include introducing RF switch controlled rectangular discontinuities on patches [4]; using a feeding mechanism made up of a hook shaped feed line and Γ-shaped slots in a patch antenna [5]; employing cross shaped slots in patch antennas [6,7]; adding stubs and notches to square slots [8]; inserting grounded inverted L strips in the radiating slots of slot antennas [9,10]; using a lightening shaped feedline [11,12]; using an L-slot in place of the traditional rectangular, circular or square slot of a slot antenna [13,14]; improving the ground plane by adding stubs to it or creating slots in it [15][16][17][18][19] or by embedding a pair of hat shaped patches in an annular ring slot and employing a deformed feedline [20]. However, most of the existing antennas posses large sizes or narrow axial ratio bandwidths (ARBW) that do not cover enough wireless applications.…”

A novel miniaturized UWB monopole with five‐section stepped‐impedance feed line

“…Consequently, design of compact antennas is a real challenge for researchers. A number of techniques have been proposed in the literature, mostly based on modifications, eg, slits and L‐shape stubs, an inverted T‐shape slit, slots in the ground plane, CPW‐fed circularly polarized square slot, protruded ground plane structures, or tapered feed region . However, in order to exploit true potential of a novel antenna topology, in particular, to achieve the smallest possible antenna size, simultaneous adjustment of all the antenna parameters is required, which can be realized by means of a rigorous EM‐driven design optimization …”