A novel reconfigurable circularly polarized (CP) patch antenna with tunable operation band and switchable polarization states is proposed. Four varactors are placed symmetrically across the cross-shaped slot on the upper square patch so that the operation band of the proposed antenna can be continuously controlled through the specially designed bias. Meanwhile, a triple-branched broadband switchable feed structure loaded with p-i-n diodes is specially designed to achieve polarization reconfigurability (LHCP, RHCP). The structure novelly integrated a 180

$^{\circ }$

broadband phase shifter with a 90

$^{\circ }$

one by a shared reference branch. Simulation results of the feed structure exhibit stable phase-shift in a wide bandwidth of 58.7

$\%$

under

$\pm 5^{\circ }$

phase imbalance. A prototype of the antenna is fabricated while both measured and simulated results agree well. The antenna achieves good impedance matching from 2 to 2.7 GHz and the axial ratios at both polarization states are smaller than 3 dB. The frequency and polarization reconfigurability make the antenna potentially suitable for satellite applications, such as multifrequency satellite data link transceiver.

#	Concept	H-Index	Publications	Citations
1	Engineering	1	1	31
2	Electrical Engineering	1	1	31
3	Metamaterials	1	1	31
4	Nanophotonics	1	1	31

	Year	Citations

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