COMPACT CIRCULARLY POLARIZED CROSSED DIPOLE ANTENNA WITH CHIP INDUCTORS AND SQUARE RINGS LOADING FOR GPS APPLICATIONS

A compact circularly polarized (CP) crossed dipole antenna with chip inductors and square rings loaded for Global Positioning System (GPS) is proposed in this letter. The CP radiation is produced by crossing two dipoles through a 90 ◦ phase delay line of a vacant-quarter printed ring. Four chip inductors inserted in the dipole arms and four square rings loaded at the back of the dipole arms are introduced to obtain a compact dipole size. The plane dimension of the proposed antenna is 28 mm × 28 mm, which can be widely used for GPS handheld devices. Details of the proposed antenna design and results are presented and discussed.