Wideband high-isolation low-cross polarization dual polarization antenna

Abstract

The invention belongs to the field of millimeter wave antennas and provides a wideband high-isolation low-cross polarization dual polarization antenna, which is applicable to a terahertz-band wirelessfull-duplex communication system. The wideband high-isolation low-cross polarization dual polarization antenna comprises a wideband sub array feed network and a dual polarization sub array unit antenna, wherein the dual polarization sub array unit antenna comprises a polarization one feed structure, a polarization two feed structure, a polarization isolation structure, a sub array power divisionstructure and a radiation unit; the polarization one feed structure and the polarization two feed structure are connected with the polarization isolation structure and the excitation modes of the twoare orthogonal; the sub array power division structure is arranged on the polarization isolation structure and is composed of a power division coupling cavity and a coupling gap arranged on the uppersurface of the power division coupling cavity, and the coupling gap is connected with the radiation unit through a matching structure. According to the wideband high-isolation low-cross polarization dual polarization antenna provided by the invention, wideband high-efficiency high-gain features can be realized, the dual polarization input port has high isolation (larger than 60 dB), and the dual polarization has high polarization purity (larger than 50 dB).

Description

technical background [0001] The invention belongs to the field of millimeter-wave antennas, and in particular relates to a wide-band, high-isolation and low cross-polarization dual-line polarization antenna. Background technique [0002] With the development of the current communication system, the full-duplex mode point-to-point communication system will be used for real-time data interaction. At present, the transceiver isolation methods of the full-duplex system mainly include frequency division isolation, ferrite isolation, and polarization isolation. Frequency division isolation adopts uplink and downlink frequency bands, and high-isolation duplexers realize the isolation of sending and receiving signals, which reduces the utilization rate of spectrum resources. Ferrite materials are used to design unidirectional transmission devices (such as circulators) to realize the simultaneous operation of system transmission and reception, but ferrite materials limit the syste...

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Problems solved by technology

[0003] At present, the design structures of dual-polarized array antennas mainly include patch antennas, substrate-integrated waveguide array antennas, and planar reflective array antennas; patch antennas excite two orthogonal modes of radiation patches through two ports to achieve dual polarization, but It is difficult to achieve a high isolation of two ports when the radiation patch is in an open space; it is difficult to realize a multi-layer structure with a substrate-integrated waveguide structure, and it is difficult to realize a high-isolation array antenna due to the loss of the substrate; the planar reflectarray antenna adopts dual-polarization The phase-shifting unit of the structure realizes the dual-polarization characteristics of the array, but requires high-isolation dual-polarization feed antennas and low aperture efficiency

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