VHF ultra-wide-band oval polarized transmitting antenna

Abstract

The invention provides a VHF ultra-wide-band oval polarized transmitting antenna. The ultra-wide-band oval polarized transmitting antenna comprises a main antenna, an auxiliary antenna and an antennamast; the main antenna is formed by four folded vibrators in a fixed connection manner; the folded vibrators are bent by stainless steel tubes integrally to form a rectangle to feed in the middle points of the long edges; the four folded vibrators are uniformly distributed on the same circumference, adjacent two folded vibrators are perpendicular mutually, and the axial line of each folded vibrator deviates for 18 degrees from the horizontal direction; a transmission line for connecting each vibrator is 25mm in length; the top end of a feeder line is connected with a transmission line of 56mmin parallel; the feeder line is reversely added with a choke tube of 30mm; the auxiliary antenna and the main antenna are the same in structure; the perpendicular distance between the auxiliary antenna and the main antenna is 60mm; and the auxiliary antenna and the main antenna are coaxially connected with the antenna mast through detachable joints. The ultra-wide-band oval polarized transmittingantenna can transmit perpendicularly and horizontally polarized waves at the same time, and can realize power distribution in two directions, so that the antenna is applicable to signal transmission of a ground station transmitter of civil and military airports for improving airport utilization rate.

Description

technical field [0001] The invention relates to a VHF frequency band transmitting antenna. Background technique [0002] The polarization of a wave describes how the direction of the electric field vector changes with time when an electromagnetic wave propagates in space. As an electromagnetic wave guiding device in free space, the antenna's polarization mode has a crucial impact on its reception and transmission. Antenna polarization can be divided into linear polarization, circular polarization and elliptical polarization, and linear polarization is further divided into horizontal polarization and vertical polarization. According to the propagation characteristics of electromagnetic waves, horizontally polarized antennas can only (receive / transmit) horizontally polarized waves, vertically polarized antennas can only (receive / transmit) vertically polarized waves, and circularly polarized and elliptically polarized antennas can only In addition to receiving or transmitting...

AI Technical Summary

Problems solved by technology

However, this distribution method of antennas leads to the inability to reuse the transmitting antennas of ground stations in military airports and civil airports, resulting in a certain degree of waste of resources.

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