Wideband Patch Antenna With Stable High Gain and Low Cross-Polarization Characteristics

Abstract

Abstract-A wideband unidirectional patch antenna with two meandering strips and a Γ-shaped feeding structure is designed. The investigation shows that the antenna achieves an impedance bandwidth of 54.2% for VSWR ≤ 2 and a stable gain of around 9 dBi. The far field radiation patterns with low cross polarization which levels are less than −27 dB, low back radiation and symmetrical Eand H-plane patterns are obtained over the whole operating frequency range.

An improved 2×2 array antenna using both-sided microwave integrated circuit technology for circular polarization

“…Murshed et al [7] proposes a reconfigurable structure that has low AR bandwidth (BW) with low omnidirectional gain, however, wide impedance BW is due to partial ground plane and parasitic radiator. Similarly, a small impedance BW and AR BW was spotted in [8], [9]. In study [10], U-shaped slot increased impedance BW although suffers from a low gain (4.5 dBi) and AR BW (3.2%).…”

“…To meet this requirement there is various approaches have been emerged in recent days to create CP where the same phenomena are inherent of creating orthogonal degenerate mode behind every approach that is applied on the patch including single, dual feed, and sequential feed. The single feeding technique includes numerous current perturbation techniques like incorporating cross slots [7], slits [8], stubs [9], spur lines and truncated corners [10]. The coaxial feed technique also can be considered as a simple technique under a single feed mechanism for creating CP and proposed in recent years [9]- [11].…”

A Review Paper on Circular Polarized Microstrip Patch Antenna

“…Many types of feeding techniques can be applied to achieve CP microstrip patch antenna. Coaxial probe feed [3][4][5][6][7][8][9] though simple, provides only narrow bandwidth. Γ-shaped [5], In [7] a single fed truncated corner square patch to generate circular polarization characteristics, In [5] circularly polarized patch antenna with loaded parasitic shorting elements to obtain size reduction [9], Loading a pair of L-shaped stubs on adjacent edges of a corner truncated patch [10], A dual-band single-fed CP, Sshaped slotted patch antenna (for dual band) with a small frequency-ratio is proposed for GPS applications in [11], In [24] an omnidirectional dual-band dual CP antenna with wide beam radiation patterns using TM01 & TM02 modes is investigated.…”

“…Low gain and narrow bandwidth are the disadvantage of patch antenna. Several techniques to increase the impedance bandwidth of patch antennas, such as aperture coupled feed [5], Lshaped probe feed [6], U-slotted patch [7], have been proposed. The most commonly used polarization technique in today's communication is circular polarization (CP) as it is not concerned with the orientation of the transmitting and receiving antennas…”

Axial Ratio Tuned Circularly Polarized Slot-Loaded Antenna for S-Band and C-Band Applications

“…provide large axial ratio bandwidth and make the design bulkier. A single feed network design makes use of the structural geometry to give the phase shift of 90 • , and a few such techniques include perturbation of the patch [2], cutting a slot or slit [3], truncation of edges [4,5], stub matching, etc.…”