Dual-Port RHCP Compact Antenna at 868 MHz Using a 120° Hybrid Coupler

Dual-Port RHCP Compact Antenna at 868 MHz Using a 120° Hybrid Coupler

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This work presents the design of a compact dual-port circularly polarized antenna based on the new coupler topology.The antenna can radiate a right-hand circular polarization (RHCP) in two Skillets opposite directions depending on the input port.In the proposed structure, the radiating system has three inverted F antennas connected to a 120° hybrid coupler.

The modeling and design of the 5-ports hybrid coupler are described and experimentally validated.The antenna prototype is fabricated using two 1.6mm-thick low-cost FR4 Epoxy substrates assembled with metal wires, with a dimension of 80mm $ imes80$ mm $ imes12$ mm (ka $ < 0.

74$ ).The proposed antenna provides the realized Kidney / Urinary Support RHCP gain of 2.4 dBic and 1.

8dBic at 868 MHz for Port 1 and Port 2, respectively.