Dual-band dual-mode antenna with polarization diversity

Reshmi Dhara; Taraknath Kundu

doi:10.3103/S0735272721050058

Authors

Reshmi Dhara National Institute of Technology Sikkim, India https://orcid.org/0000-0002-9790-6858
Taraknath Kundu National Institute of Technology Sikkim, India

DOI:

https://doi.org/10.3103/S0735272721050058

Keywords:

Circular polarization, Impedance band width, dual-band dual-mode dual-polarized.

Abstract

A compact dual-band dual-mode and dual-polarized (DBDMDP) antenna based on an asymmetrical Y-shaped microstrip line feeding along with a square ring radiator is proposed. The structure is loaded with two pairs of L-strips to extend the lower mode bandwidth (center frequency f_c = 9.36 GHz). This section is employed to change an electromagnetic field distribution and achieve dipole-like omni-directional linearly polarized (LP) radiation. The asymmetrical Y-shaped microstrip line feeding section is used to realize patch-like directional circular polarization (CP) radiation for the higher mode (at f_c = 12.13 GHz). The measured results show that the 10-dB impedance bandwidths for the dipole mode and patch mode are equal to 730 MHz (7.72%, f_c = 9.45 GHz) and 1648 MHz (14.26%, f_c = 11.56 GHz), respectively, among which the 3 dB simulated axial ratio bandwidth of the patch mode is of 1280 MHz (10.74%, centre frequency of CP band f_CP = 11.92 GHz). The two modes’ maximum gains at f_c = 9.36 and 12.13 GHz are equal to 1.44 and 2.62 dBi, respectively. The maximum peak gain is of 3.32 dBi at frequency of 12.27 GHz. This single-feed patch antenna can be useful in wireless communication applications for its compact structure, considerable bandwidth, stable radiation pattern and polarization diversity.

Author Biographies

Reshmi Dhara, National Institute of Technology Sikkim

Assistant Professor, Dept of Electronics and Communication Engineering, National Institute of Technology Sikkim, India

Taraknath Kundu, National Institute of Technology Sikkim

Assistant Professor

HOD Department of Chemistry
National Institute of Technology Sikkim
Ravangla, South Sikkim
PIN 737 139

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