Ultra‐high‐frequency wideband circularly polarized crossed‐dipole antenna with wide axial‐ratio beamwidths for SATCOM applications

2019 ◽  
Vol 62 (1) ◽  
pp. 233-238
Author(s):  
Chao Li ◽  
Ze‐Hong Yan ◽  
Ying Liu ◽  
Wei Hu
Keyword(s):  
High Frequency ◽  
Axial Ratio ◽  
Dipole Antenna ◽  
Circularly Polarized ◽  
Ultra High Frequency

scholarly journals Design of an Ultrawideband Circularly Polarized Printed Crossed-Dipole Antenna Based on Genetic Algorithms for S-Band CubeSat Applications

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jorge Simon ◽  
Hugo Perez-Guerrero ◽  
Jorge Sosa-Pedroza ◽  
Fabiola Martínez-Zúñiga ◽  
Juvenal Villanueva-Maldonado ◽  
...  
Keyword(s):  
Genetic Algorithms ◽  
Microstrip Antenna ◽  
Axial Ratio ◽  
Dipole Antenna ◽  
Simulation Software ◽  
Operating Frequency ◽  
Electromagnetic Simulation ◽  
Central Frequency ◽  
Circularly Polarized ◽  
Application Requirements

As in any satellite, onboard antennas for CubeSats are crucial to establish communication with ground stations or other satellites. According to its application, antennas must comply with standardized requirements related to size, bandwidth, operating frequency, polarization, and gain. This paper presents an ultrawideband circularly polarized two-layer crossed-dipole microstrip antenna for S-band CubeSat applications using genetic algorithms optimization tools included in the 3D electromagnetic simulation software Ansys HFSS. The antenna is constructed on a 10 × 10 cm Cuclad-250 substrate with a back copper flat plane, located at λ/4 at 2.25 GHz operating frequency. The backplane with the exact substrate dimensions improves gain and reduces inside satellite radiation. Measured bandwidth defined by S11 at a −10 dB was higher than 1835 MHz with S11 = −24.68 dB at the central frequency of 2.25 GHz, while measured VSWR at the same frequency was 1.124. At 2.25 GHz, the maximum measured gain and the minimum measured axial ratio in the broadside direction were found to be 6 dBi and 0.22 dB, respectively. There are antenna simulations and measurements, as long as its fabrication guarantees application requirements that make it ready for prespace testing.

Wideband circularly polarized antenna with metallic walls for L-band applications

Circuit World ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mohammad Pourbagher ◽  
Changiz Ghobadi ◽  
Javad Nourinia ◽  
Rahim Naderali
Keyword(s):  
Frequency Band ◽  
Phase Shifter ◽  
Ground Plane ◽  
Axial Ratio ◽  
Dipole Antenna ◽  
Impedance Bandwidth ◽  
Content Type ◽  
Circularly Polarized ◽  
Study Results ◽  
L Band

Purpose To achieve right-hand circular polarization (RHCP), a 3-dB Wilkinson power divider with a λ/4 phase shifter is used. The crossed-dipoles are placed at almost λ/4 elevation on the ground plane and connected to two coaxial cables. Experiments show that the impedance bandwidth of 49.40% (913.7–1,513.1 MHz) and axial ratio bandwidth (ARBW) of 22.88% (1,145.8–1,441.8 MHz) are achieved. Design/methodology/approach In this study, a wideband crossed-dipole antenna with circularly polarized (CP) radiation for L-band satellite and radar applications is presented. The proposed CP antenna comprises two orthogonally placed printed dipoles, a quadrature coupler and a box-shaped ground plane. Findings Furthermore, by fixing the box-shaped ground plane under the radiators, 5.13 dBic RHCP peak gain at 1,300 MHz and maximum half-power beamwidth (HPBW) of 84.5° at 1,170 MHz are realized for the antenna. Originality/value Eight metallic walls are connected to four corners of the substrate to stabilize the radiation properties in this study. Results show that the ARBW and front-to-back ratio are improved and the maximum HPBW around 127° across the operating frequency band is achieved. The proposed CP antenna is a good candidate for Global Positioning System (GPS) L2 (1.227 GHz), GPS L5 (1.176 GHz) and air route surveillance radar system at 1,215–1,390 MHz frequency band.

scholarly journals A CIRCULARLY-POLARIZED METASURFACED DIPOLE ANTENNA WITH WIDE AXIAL-RATIO BEAMWIDTH AND RCS REDUCTION FUNCTIONS

2015 ◽  
Vol 154 ◽  
pp. 79-85 ◽  
Author(s):  
Chen Chen ◽  
Zhuo Li ◽  
Liangliang Liu ◽  
Jia Xu ◽  
Pingping Ning ◽  
...  
Keyword(s):  
Axial Ratio ◽  
Dipole Antenna ◽  
Circularly Polarized

scholarly journals A Very Wideband Circularly Polarized Crossed Straight Dipole Antenna with Cavity Reflector and Single Parasitic Element

2018 ◽  
Vol 8 (1-2) ◽  
Author(s):  
Huy Hung Tran ◽  
Minh Thuan Doan ◽  
Cong Danh Bui ◽  
Nguyen Truong Khang
Keyword(s):  
Circular Polarization ◽  
Axial Ratio ◽  
Dipole Antenna ◽  
Impedance Bandwidth ◽  
Circularly Polarized ◽  
Parasitic Element ◽  
Proper Size ◽  
Radiating Element ◽  
Final Design ◽  
Operating Bandwidth

A very wideband circularly polarized (CP) crossed dipole antenna is presented in this paper. The primary radiating element of the antenna consists of two straight dipoles arranged orthogonally through double printed rings. To further enhance the axial ratio bandwidth, a cavity with proper size and single parasitic element are employed to generate two additional bands. The use of cavity reflector is investigated thoroughly, providing a solid framework for designing this type of antennas. The final design with an overall size of 0.92λo × 0.92λo × 0.32λo at the center CP frequency yields a measured –10 dB-impedance bandwidth of 75.2% and 3 dB-axial ratio bandwidth of 67.7%. The proposed antenna exhibits right-handed circular polarization and an average broadside gain of about 8.3 dBi over the CP operating bandwidth.

scholarly journals Design and Analysis of Non-Uniformly Spaced Dipole Array Antenna

2021 ◽  
Vol 23 (08) ◽  
pp. 383-390
Author(s):  
N Soujanya ◽  
◽  
Dr. Mahesh A ◽  
Keyword(s):  
Axial Ratio ◽  
Side Lobe ◽  
Dipole Antenna ◽  
Side Lobe Level ◽  
Reference Element ◽  
Flow Solver ◽  
Circularly Polarized ◽  
Dielectric Lens ◽  
Radar Applications ◽  
Secondary Radiator

Dipole antenna array is designed at operating frequency of 450MHz using FR4 substrate. Uniform circularly polarized (UCP) and non-uniform circularly polarized (NUCP) dipole arrays are designed. NUCP array is achieved by placing antenna elements at unequal distance from the reference element. Low side lobe level is necessary to reduce interference with other frequencies in the band which is achieved in case of NUCP array compared UCP array. The simulation is carried out using EM flow solver HFSS. The simulation results indicate that there is a reduction in the side lobe level for the 1×7 NUCP array as compared to UCP array. To enhance the gain of the dipole array dielectric lens is used as the secondary radiator which also acts as a radome to protect the array. The maximum gain achieved is 1.59dB with lens. Return loss less than -15dB is achieved in all cases. Axial ratio less than 3dB achieved for circular polarized arrays. The designed NUCP array with lens can be used in SAR (synthetic aperture radar) applications.

scholarly journals Wideband Circularly Polarized Planer Inverted-F Antenna using Reactive Impedance Surface

2019 ◽  
Vol 9 (1) ◽  
pp. 4240-4245
Keyword(s):  
High Frequency ◽  
Axial Ratio ◽  
Size Reduction ◽  
Impedance Bandwidth ◽  
Impédance Surface ◽  
Impedance Surface ◽  
Circularly Polarized ◽  
High Frequency Structure Simulator ◽  
Narrow Bandwidth ◽  
Measured Impedance

A wideband circularly polarized (CP) planar inverted-F antenna (PIFA) is proposed and designed using reactive impedance surface (RIS) for mobile communication. PIFA with RIS is used for CP radiation, size reduction and wideband of the proposed CP-PIFA. It is a different technique for improving the various performance parameters of the antenna, that is, narrow bandwidth, size reduction, and the axial ratio (AR). The structure of circular polarized PIFA is designed, analyzed, geometrically optimized, and implementation of the antenna to operate at 2.4 GHz WLAN bands. Finally, a proposed CP-PIFA is analyzed and simulated using full 3D electromagnetic high-frequency structure simulator (HFSS). The measured impedance bandwidth of designing an antenna (S11) 10-dB is 1399 MHz (1.542-2.943 GHz) 58.29\%, simulated 3-dB axial ratio bandwidth is 870 MHz (1.639-2.50 GHz) 36.25\%, measured voltage standing wave ratio (VSWR) is 1.02 and the realized gain is 8.1 dB for the 2.4 GHz WLAN bands

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