Low-profile broadband dual-polarized antenna with high front-to-rear ratio

Abstract

The invention belongs to the technical field of dual-polarized antennas, and discloses a low-profile broadband dual-polarized antenna with the high front-to-rear ratio. The antenna is provided with aradiation patch, an impedance transformation microstrip line, and a reflection floor. The radiation patch employs four trapezoidal radiation elements. One of a pair of radiation elements of the radiation patch in a diagonal direction works in a linearly polarized working state, and the other one of the pair of radiation elements of the radiation patch in the diagonal direction works in an orthogonal linearly polarized working state. The microstrip line employs a cross-type feed mode. One pair of radiation elements carry out the coupling feed and direct feed through a microstrip transmission line, and the other pair of radiation elements are connected and carry out feed through a microstrip transmission line of the same type, wherein the cross part of the two microstrip transmission line isisolated through the bending of one microstrip line. The thickness of the antenna is 0.1*lambda, the impedance bandwidth of the antenna is 36.6%, the isolation degree of an impedance bandwidth innerport is greater than 25dB and the front-to-rear ratio can reach 31dB. The antenna achieves the high isolation degree and the wide impedance bandwidth.

Description

technical field [0001] The invention belongs to the technical field of dual-polarized antennas, in particular to a low-profile broadband dual-polarized antenna with a high front-to-back ratio. Background technique [0002] A dual-polarized antenna can transmit or receive two orthogonally polarized electromagnetic waves, so within the same frequency band, the antenna can simultaneously transmit or receive two signals. The dual-polarized antenna can realize the function of two antennas, which can reduce the antenna cost and installation space; at the same time, the use of orthogonal polarization for the transceiver antenna can reduce the mutual coupling effect between the transceiver antennas and improve the communication quality; The communication link can be extended to increase the communication capacity. At present, dual-polarized antennas are widely used in the fields of wireless communication and radar imaging. Commonly used dual-polarized antenna forms include orthogo...

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problems existing in the prior art are: in the existing dual-polarized antenna technology, when the antenna height is less than 0.1λ, the antenna bandwidth can only reach about 20%; when the antenna is small in size, its input impedance is shown as Obvious resonance characteristics, both resistance and reactance change drastically, making the antenna show narrow-band characteristics when connected to a 50-ohm standard feeder; when the antenna has a low profile, the input resistance will be significantly reduced, making impedance matching more difficult

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