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A wideband circularly polarized (CP) antipodal curvedly tapered slot antenna (ACTSA) based on waveguide is presented in this paper. By employing the ridge on the broadwall of the slotted waveguide, the antenna can obtain compact structure. The proposed antenna can achieve a bandwidth of 20.8% (56 GHz–69 GHz) for both axial ratio (AR) < 3 dB and reflection coefficient S(1,1) < −10 dB and a gain...
A wideband circularly polarized (CP) microstrip multiple-input-multiple-output (MIMO) antenna for long term evolution (LTE) systems is proposed. Wideband feed network (WFN) based on coupled-line power divider and phase shifter is utilized to provide two ways of orthogonal signal. Then a square patch loaded with quad-symmetrical slots produces the CP radiation. The antenna design is simulated and the...
A novel broadband circular polarized two-element PIFA antenna with pattern diversity and high isolation is proposed which can be easily fabricated and embedded into RFID readers. Circular polarization characteristic of the proposed antenna is achieved by introducing a cross branch at its corner of the ground. The modified PIFA structure gives the antenna a broadband impedance bandwidth characteristic...
A novel planar antenna with broadband and circular polarization characteristics is reported which can be easily fabricated and embedded into RFID readers. Circular polarization radiation is achieved by introducing a cross branch at its corner. And the modified PIFA structure gives the antenna a broadband impedance bandwidth characteristic. For ease in integration with active devices and design facilitation,...
A novel circularly polarized handset antenna which is compatible with multiple Global Navigation Satellite Systems is proposed. The antenna comprises a palm-size slab as the handset test bench, a small antenna chip mounted at the corner of the slab, three branches, a small patch, and a ground plane with rectangle clearance region. The antenna is featured with several characteristics such as quad frequency...
A broadband planar antenna with circular polarization is proposed, fabricated and measured. Circular polarization (CP) radiation of the proposed antenna is achieved by introducing a cross branch at its corner. And the modified PIFA structure gives the antenna a broadband impedance bandwidth characteristic. For ease in integration with active devices and design facilitation, the radiating element and...
A novel compact single feed circularly polarized disk patch antenna with high front-to-back ratio for radio frequency identification (RFID) reader in the ultra high frequency (UHF) is proposed. A perturbation is induced by two cuts for the circular polarization. Four silts on the disk are used to miniaturize the size of the antenna. Furthermore, the backward radiation is reduced by the slits and the...
A novel dual-band dual-polarization stacked microstrip -dielectric antenna is analyzed and designed. It transmits left-hand circularly polarized (LHCP) signals in L band and receives right-hand circularly polarized (RHCP) signals in S band. The antenna has been realized by two stacked square patches which are fed by four quadrature pins placed symmetrically on the two main axis. The amplitude and...
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