volume | PIER Journals

Abstract

This paper presents a novel polarization reconfigurable, dual-band, dual-circularly polarized, shared-aperture antenna. The proposed antenna consists of multilayer configurations with two polarization states, i.e., left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP) at L5 (1.164-1.88 GHz) and S (2.48-2.50 GHz) bands. A multisegmented ring is used as a radiator for the L5/S band and is excited electromagnetically through two coupling elements. These coupling elements are connected to a compact polarization reconfigurable hybrid power divider using two vias. This innovative reconfigurable circuit with a hybrid power divider performs circular polarization (LHCP/RHCP) reconfigurability operation using RF-MEMS switches, which improves the antenna's performance. Polarization states can be switched from LHCP to RHCP and vice versa using these RF MEMS switches. The proposed antenna provides a good agreement between simulated and measured results for both bands. Good impedance matching (return loss > 10 dB) and circular polarization (AR < 3) are obtained in the operating bands. The realized peak gain is of the order of 5.32 dBiC for LHCP and 5.66 dBiC for RHCP in the L5 band, and similarly it is 6.67 dBiC for LHCP and 6.99 dBiC for RHCP in the S band using a low-loss multilayer combination of substrate materials.

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Ms. Bhawna Kalra

Dr. Soumava Mukherjee

Professor Ghanshyam Singh

Dr. Mahendra Mohan Sharma

Dr. Jaiverdhan