Microstrip patch antenna feed for offset reflector antenna for dual band application

Abstract

In this article, details of a dual band microstrip patch antenna (MPA) array feed for an offset reflector antenna is presented. The main objective of the proposed structure is to achieve low cross‐polarization at Φ = 90° plane in the reflector pattern. Low cross‐polar levels in the reflector pattern are achieved by illuminating the reflector with fields of the proposed dual band feed structure. A centered circular array as the dual band feed structure is proposed in which the central radiating element is a dual mode circular MPA operating at 6 GHz and the surrounding circular ring of eight circular MPA elements operating at 4 GHz in the dominant mode. The dual mode central antenna uses the concept of conjugate field matching for cross‐polarization reduction. TM21 mode is excited at an appropriate ratio with the TM11 mode to achieve the proper field matching at 6 GHz. The radius of the surrounding circular array is varied to obtain cross‐polarization better than −30 dB at both the resonant frequencies. The offset reflector gain is found to be better than 37 dB with a 2.5 m parabolic reflector and F/D = 0.8 at both the operating frequencies.

A wideband beam shaping reflector antenna using model predictive control

“…The central curve can be expressed by the following differential equation: …”

“…The test results show this method has an error rate of about 12% . In another study, GA has been used for synthesis of reflector antenna in which GA and the hybrid FEM‐RBCI have been used to synthesize and optimize the shape of a multiband patch antenna . A generalized diffraction synthesis technique for single and dual reflector antennas with single or array feed presented .…”

“…12 In another study, GA has been used for synthesis of reflector antenna in which GA and the hybrid FEM-RBCI have been used to synthesize and optimize the shape of a multiband patch antenna. 13 A generalized diffraction synthesis technique for single and dual reflector antennas with single or array feed presented. 14 This method combines physical optics (PO) and physical theory of diffraction (PTD) resulting in high versatility and accuracy.…”

THE MICROSTRIP ARRAY ANTENNA WITH REFLECTOR at 1.4 AND 2.4 GHz for RADARS APPLICATIONS

“…There are different studies on microstrip arrays (Kim & Kim, 2021;Y. Li & Luk, 2015;Midasala & Siddaiah, 2016;Yang, Geyi, & Sun, 2017) and microstrip reflectors (Debbarma & Bhattacharjee, 2019;Fernandes et al, 2019;Kim & Kim, 2021;Krishna, Shirisha, Isfahani, & Manisha, 2023;Mohammadi Shirkolaei & Engineering, 2020;Zhou, Cheng, Chen, & Luo, 2021) antennas to increase the gain and bandwidth of these antennas. Among the studies, E-shaped broadband microstrip antennas are one of them (Ge, Esselle, Bird, & Propagation, 2004;Rajagopalan, Kovitz, & Rahmat-Samii, 2012).…”