A Left/Right-Handed Dual Circularly-Polarized Antenna With Duplexing and Filtering Performance

A Left/Right-Handed Dual Circularly-Polarized Antenna With Duplexing and Filtering Performance

Blog Article

A shared-radiator dual-band dual-sense circularly-polarized (CP) microstrip antenna with duplexing and filtering functions is presented.For each band, there is a coupling network, which consists of a hairpin resonator, a straight slot, and a U-slot, and thus two paths with an inherent 90° or -90° phase Kits difference are available for the input signal to couple to the patch, left-handed CP (LHCP) characteristic and right-handed CP (RHCP) characteristic are respectively realized at different bands for the proposed antenna with a single patch.Such a dual-band dual-sense CP patch antenna is highly integrated and outperforms other traditional CP antennas state-of-the-art.Moreover, the duplexing and filtering functions are seamlessly integrated into the dual-band patch antenna with a low-profile 0.044λo), and application of such an integrated device in wireless systems can potentially reduce the volume, complexity, and cost of RF front-ends.

Based on resonator-based topologies, the principles of achieving the Toy dual-sense CP, duplexing, and filtering functions are illustrated.As a proof-of-concept, an antenna working at C-band is prototyped and tested.Good agreements between the measured and simulated results are achieved, showing an LHCP radiation characteristic for the low-band operation and a RHCP radiation characteristic for the high-band operation, respectively.The antenna also exhibits very good frequency selectivity and out-of-band rejection performance.At the low-band, the impedance and 3-dB axial-ratio (AR) bandwidths are 4.

7% and 1.1%.At the high-band, the impedance and AR bandwidths are about 7.3% and 3.2%.

The isolation between the two channels/bands is over 24 dB.