A Design of A Compact Circularly Polarized Patch Antenna Based on Composite Right/Left-Handed Transmission Line
ZHOU Cheng
GENG Lin
LIANG Jian-gang
Abstract：A method of designing a compact circularly polarized (CP)patch antenna is proposed based on a composite right/left-handed (CRLH)transmission line (TL)unit-cell.The CRLH TL unit-cell includes a complementary split ring resonator (CSRR)nicked at antenna floor for realizing inductance in parallel and a gap slotted at the center of a sticked plate for realizeing serial capacitance.The CSRR can decrease the TM10 mode resonance frequency,thus reducing the size of the proposed antenna.Simultaneously,the a-symmetry of the CSRR brings about a parasitical mode which crosses the +1 st-order mode orthogonally by changing the slot radius.The combination of these two orthogonal modes with 90°phase shift makes the proposed antenna form a CP property.The experimental results show that the size of the proposed an-tenna is 0.389λg×0.389λg,and the impedance bandwidth and the axial ratio bandwidth are of 16.08% and 1.52% respectively.Moreover,the proposed antenna is designed without impedance transformer,90° phase shift and ground via,and is easy to design and process.
Keywords：circularly polarization antennaminiaturizeaxial ratiocomposite right/left CRLH TL
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 37-40 )