Planar helical antenna of combined structure

Abstract

The invention discloses a planar helical antenna of a combined structure. A planar equiangular helical antenna is combined with a planar Archimedes screw antenna. One and half ring of equiangular helix structure is used in the inner ring, an Archimedes helix structure is used in the outer ring, and the tail end of equiangular helix is in seamless connection with the initial end of Archimedes helix. The planar helical antenna of the combined structure is a groove-radiation planar helix antenna with double symmetrical arms, the diameter of the antenna is 50mm, the thickness of an antenna base plate is 0.8mm, and a dielectric slab of a dielectric constant of 2.2 is used. The planar helical antenna also comprises four surface-mounted resistors, wherein the resistance of the resistor is 160ohm, the resistors are connected between the outermost ring and the last but one ring of the antenna, and the angle between the adjacent surface-mounted resistors is 90degree; and the antenna further comprises two copper rings arranged in the periphery of the antenna. According to the invention, the size of the planar helical antenna is effectively reduced, and the circular polarization performance of the antenna is improved.

Description

technical field [0001] The invention relates to a planar helical antenna, in particular to a miniaturized composite structure planar helical antenna, which belongs to the technical field of microwave antennas. Background technique [0002] The concept of ultra-wideband antenna was proposed by Ramsey in 1957. Ultra-wideband refers to the relative bandwidth of antenna sending and receiving signals. When the ratio of signal bandwidth to center frequency is less than 1%, it is called narrowband. Bandwidth and center frequency The ratio between 1% and 25% is called broadband, and when the ratio of bandwidth to center frequency is greater than 25%, it is called ultra-wideband. An ultra-wideband antenna is an antenna device used to transmit and receive ultra-wideband signals. UWB antennas in the prior art include equiangular planar helical antennas and Archimedes planar helical antennas developed by Dyson et al. [0003] However, the development of planar helical antennas has bee...

AI Technical Summary

Problems solved by technology

However, there are still problems with the above two improvement methods. One is that the effect of reducing the size of the antenna is general, and the other is that the performance of the antenna, especially the circular polarization performance, is not good.

[0004] There are no strict technical specifications for planar helical antennas, but it is generally believed in the industry that the frequency band with return loss less than -10dB is the effective working frequency band

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