A Compact Wideband Circularly Polarized L-Slot Antenna Edge-Fed by a Microstrip Feedline for C-Band Applications

Abstract

Abstract-A compact circularly polarized antenna using a wide L-shaped slot and a microstrip feedline is proposed. The measured results demonstrate that the antenna has an axial ratio (AR) < 3 dB bandwidth ranging from 5-8.5 GHz and an S 11 < −10 dB bandwidth ranging from 4-8.6 GHz. The antenna is very simple, composed of an L-slot and a microstrip feedline placed beneath and to the edge of the L-slot. The size of the antenna is 20 × 20 mm 2 which is attractive for compact wireless devices that operate in C-band. The antenna has very low cost and does not require: a large size, truncated corners, reflecting surfaces, complex feeding structure, and via connections, which increase fabrication cost and design complexity.

Single‐fed dual wideband filtenna for 4G / 5G mobile applications

“…At the end of the feeding line there is a second matching rectangular stub for achieving a broadband impedance matching characteristics. The design is based on the concept in Reference 15 and a particle swarm optimization technique in the CST simulator is used in order to optimize the slot dimensions and the matching stub for achieving broadband CP antenna performance at the MMW frequency band of operation. Integrating the microwave element with the MMW element can be viewed as loading the same aperture area with double tuning stubs, as discussed in detail in References 16 and 17.…”

A Simple Broadband Flat-Gain Circularly Polarized Aperture Antenna With Multiple Radiation Modes

“…By using broadband CP antennas, not only the multipath effects can be mitigated, but also the complexity inherent in the multiservice wireless systems can be reduced. In recent years, many broadband CP antennas have been proposed [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Among them, wide apertures with single feed structure have been widely studied, owing to their features such as wide impedance bandwidth, low cost low profile, and easy fabrication.…”

Broadband Circularly Polarized Cross Shaped Slot Antenna With an Improved Feedline

“…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.…”

“…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.…”