Abstract
A wideband dual-polarized planar antenna is designed and analyzed by using the theory of characteristic modes (TCM). The eigenvalue, eigencurrent, characteristic pattern, and modal weighting coefficient are analyzed to bring physical insight to this kind of antenna. The results demonstrate that there are two modes resonant in the operating band for each polarization, which have been combined to form a wider frequency band. A bandwidth of 60.2% (1.72–3.2 GHz) for VSWR < 1.5 with high isolation of 32 dB is achieved simultaneously. The size of the radiator structure is 0.33λ0× 0.33λ0× 0.22λ0(λ0refers to the center operating frequency).
Highlights
Dual-polarized antennas have been widely investigated in wireless communications in past decades [1,2,3]
In the design process of dual-polarized patch antenna, most of the reported designs focus on the impedance matching and isolation enhancement because the design is clearly based on cavity model [4]
Different with the model in analysis of theory of characteristic modes (TCM), the antenna analysis in HFSS is fabricated on the lossy substrate with finite size
Summary
Dual-polarized antennas have been widely investigated in wireless communications in past decades [1,2,3]. Various dual-polarized planar antennas which are based on crossed dipole have proved their excellent performance and been reported frequently. In the design of this kind of antenna for dual-polarized application, some performance is studied, such as the bandwidth enhancement, isolation improvement, size-reduction, and planarization design [5,6,7,8,9]. There are still many problems existing in the way to analyze the resonant performance of cross-dipole antenna. This kind of planar antenna is analyzed by studying the elements of the crossed dipole independently. The crossed line dipole can be analyzed independently because the currents on one of the dipole are orthogonal with the other in dual-polarized application. Theory of characteristic modes (TCM) is applied to analyze dual-polarized planar antenna.
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