Patch Antenna Using Rectangular Centre Slot and Circular Ground Slot for Circularly Polarized Synthetic Aperture Radar (Cp-Sar) Application

Abstract

Abstract-In this paper, a circularly polarized antenna for Synthetic Aperture Radar (SAR) application is presented. The antenna is proposed to be implemented for the airborne SAR and the spaceborne SAR. To enhance the bandwidth of the antenna, the Circular-Ring-Slot (CRS) technique is implemented on the ground plane and in a square slot in the centre of the patch. In this antenna's design, the model of the slot on the radiator is also investigated. The antenna is printed on NPC-H220A substrates with the dielectric constant of 2.17 and thickness of 1.6 mm. The resonant frequency of the antenna design sets at 9.4 GHz with the minimum requirement of the bandwidth of 800 MHz. The antenna design is produced under the −10 dB bandwidth of reflection coefficient, S 11 of approximately 27% (8.2 GHz-10.76 GHz) and left-handed circular polarization (LHCP). The gain of the antenna is 6.5 dBic and 12.7% (8.8 GHz-9.84 GHz) for the axial ratio bandwidth (ARBW). This paper includes the description and presentation of the completed discussion.

Computation and Experiment on Linearly and Circularly Polarized Electromagnetic Wave Backscattering by Corner Reflectors in an Anechoic Chamber

“…If the tool is modified to handle lower-frequency operations, it can be equipped with lower-frequency antennas, e.g., the circularly polarized microstrip antenna [24] that can handle frequencies of around 2.2 GHz. If it is intended to do simulations for higher frequencies, it can be equipped with, for example, the circularly polarized microstrip [25] that can operate in frequencies of around 9.4 GHz. The software has now become a graphical user interface (GUI) tool, namely AST_V1.…”

A Circularly Polarized Quad-Band Annular Ring Antenna With Asymmetric Ground Plane Using Theory of Characteristic Modes

“…2(a) and (b), respectively. In Antenna.1, eight symmetrical slots are etched around the edge of the annular radiator [26] to obtain wide impedance band at upper frequency boundary, and on the edge of the radiating element an array of parasitic strips are utilized to achieve CP radiation. Antenna.1 gave two small impedance bands, and ARBW values were too large (> 3 dB).…”

“…Nowadays, multiple circularly polarized antennas are replaced by a single antenna which satisfies multiple band operation. Slot antenna [4][5][6][7][8] research has greatly impacted various fields like telecommunication, medical, military, and commercial applications by helping in realizing miniaturized microstrip antennas needed in these areas. Very recently, a triple band circularly polarized antenna has been demonstrated using slot/strips [9].…”

A Circularly Polarized Circularly-Slotted-Patch Antenna With Two Asymmetrical Rectangular Truncations for Nanosatellite Antenna

“…Presently, many methods are applied to generate CP waves such as by equilateral triangular microstrip patch with [8,9] the dual-feeding method and [10] the single feed [14] by inserting slits of different lengths at the edges of a square patch. The others for generating CP waves with a slot antenna presented by [15] using single feed cross slot, [16,17] by a narrow slot or across slot with unequal slot lengths with single feed, [18] by single feed with a rectangular center slot, [19] by single feed with arc-shaped slot, [20] by slanted rectangular slot, and [21] by space-filling-based slot antenna.…”