This paper presents a design of a compact wide slot circularly polarized antenna which is fed by a microstrip feed line. The designed antenna covers an area of size 25 mm × 25 mm with a substrate thickness of 1.6 mm. The 3 dB axial ratio (AR) band can be produced by projecting a circular stub in the ground plane and feeding the slot through an asymmetry-fed microstrip feedline. The AR bandwidth of the antenna is further improved by adding truncation in the ground plane. Measured results show that the graph attains an impedance matching bandwidth of 124.3% centered at 7.4 GHz (2.8-12 GHz) and a 3 dB AR bandwidth of 52.42% centered at 5.15 GHz (3.8-6.5 GHz). The proposed antenna is suitable for the use in C-band applications.
This paper proposes a microstrip-fed simple square slot patch antenna, which produces a triple band and is circularly polarized. The designed antenna consists of an L-shaped patch radiator in which the lower part of L is modified to a circle instead of a rectangle, and two rectangular strips are inserted from the opposite corners of the ground plane. Two small rectangular slits have also been used in the design to generate the triple band and widen the bandwidth too. The antenna has been fabricated and measured, and it shows a good agreement between them. The measured impedance bandwidths (IBWs) are 44.06% (2.3-3.6 GHz) and 73.68% (4.8-10.4 GHz), and the axial ratio bandwidths (ARBWs) are 37.29% (2.4-3.5 GHz), 13.6% (4.8-5.5 GHz), and 32.35% (5.7-7.9 GHz) in the lower, middle, and upper band, respectively.
A simple and compact antenna with dual band along with dual circular polarization is designed. The proposed antenna resembles a cup like shape which is actually a semicircle attached to the microstrip feed line in the patch part. From the dual notch frequency band, the first notch is from 12.2 – 13.5 GHz, second notch is from 14.8 – 16.4 GHz.Both the first and second notch bandwidth falls under the Ku band which ranges from 12 – 18 GHz. The proposed antenna also satisfies the circular polarization whose axial ratio bandwidth comes under the range of impedance bandwidth with a frequency range of 12.3 – 13.2 GHz and 15.3 – 16.3 GHz which satisfies the frequency range of Ku band (12-18 GHz). The simulation process is carried out by using the software Ansoft commercial high frequency structure simulator (HFSS ver. 21).
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