Beam focussing properties of circular array antenna by employing dielectric resonator antennas

2012 ◽  
Author(s):  
Mehak Garg ◽  
Satish K. Sharma
Keyword(s):  
Dielectric Resonator ◽  
Array Antenna ◽  
Circular Array ◽  
Dielectric Resonator Antennas ◽  
Circular Array Antenna

scholarly journals A Novel Ultrawideband Gear-Shaped Dielectric Ring Resonator Antenna

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Mehdi Ghorbani ◽  
Habib Ghorbaninejad
Keyword(s):  
Dielectric Resonator ◽  
Ring Resonator ◽  
Ground Plane ◽  
Array Antenna ◽  
Impedance Bandwidth ◽  
Circular Array ◽  
Dielectric Resonator Antennas ◽  
Resonator Structure ◽  
Quarter Wave ◽  
Design Characteristics

In this study, a novel ultrawideband (UWB) dielectric ring resonator (DRR) antenna has been proposed. DRR antennas include a single monopole antenna in the center of a ground plane and a dielectric with a symmetric structure around the monopole. This structure will lead to ultrawide band antenna. However, it is still possible to enhance the antenna bandwidth. In this study, we combine the DRR structure with an array antenna. The proposed antenna includes a circular array of four triangle resonators, which is rotated around the center of the triangle base to form a gear-shaped ring resonator antenna. In this design, characteristics of all these antennas are combined to enhance the antenna bandwidth including triangular dielectric resonator, circular array antenna, dielectric ring resonator structure, and a quarter-wave electric monopole. Triangular dielectric resonator antennas are wideband and in small size. Ring resonator antennas are inherently ultrawideband. Quarter-wave electric monopole and circular array structure can also enhance antenna bandwidth. This novel shape of the DRR antenna possesses the wider impedance bandwidth compared to similar works. Impedance bandwidth is 150% (5.2–36.1 GHz), and the bandwidth ratio is 1 : 6.9, which is much greater than earlier reports.

scholarly journals Synthesis of Circular Array Antenna for Sidelobe Level and Aperture Size Control Using Flower Pollination Algorithm

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
V. S. S. S. Chakravarthy Vedula ◽  
S. R. Chowdary Paladuga ◽  
M. Rao Prithvi
Keyword(s):  
Array Antenna ◽  
Computational Time ◽  
Flower Pollination Algorithm ◽  
Side Lobe Level ◽  
Aperture Size ◽  
Circular Array ◽  
Sidelobe Level ◽  
Beam Scanning ◽  
Flower Pollination ◽  
Circular Array Antenna

Sidelobe level suppression is a major problem in circular array antenna (CAA) synthesis. Many conventional numerical techniques are proposed to achieve this which are time consuming and often fail to handle multimodal problems. In this paper, a method of circular array synthesis using nature inspired flower pollination algorithm (FPA) is proposed. The synthesis technique considered here adapts one and two degrees of freedom, namely, amplitude only and amplitude spacing. The effectiveness of the FPA is studied by comparing the results with genetic algorithm (GA) and uniform circular array antenna (UCAA) with uniform spacing. Also the effect of additional degree of freedom on the aperture size and the computational time is analyzed. A relative side lobe level (SLL) of −25 dB is achieved using the algorithm under both no beam scanning (0°) and beam scanning (15°) conditions for 20 and 40 elements of CAA.

Step-scanned circular-array antenna

1970 ◽  
Vol 18 (5) ◽  
pp. 590-595 ◽  
Author(s):  
J. Boyns ◽  
C. Gorham ◽  
A. Munger ◽  
J. Provencher ◽  
J. Reindel ◽  
...  
Keyword(s):  
Array Antenna ◽  
Circular Array ◽  
Circular Array Antenna
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