Broadband high-gain CTS omnidirectional antenna

Abstract

The present invention discloses a broadband high-gain CTS omnidirectional antenna which comprises a cylindrical metal matrix and a collinear antenna array, the collinear antenna array is composed of eight antenna radiation units, each antenna radiation unit is realized by adopting an annular CTS radiation branch knot, each annular CTS radiation branch knot is realized by adopting a multi-stage stepped impedance converter, eight annular grooves with the same size are formed in the outer side wall of the cylindrical metal base body, the eight antenna radiation units are arranged in the eight annular grooves in a one-to-one correspondence mode, and a coaxial input waveguide power divider adopting a parallel feed mode is arranged in the cylindrical metal base body, and is used for feeding quasi-TEM waves with uniformly distributed amplitude and phase to the eight antenna radiation units in an equal-amplitude and same-direction manner, and the eight antenna radiation units respectively radiate the quasi-TEM waves fed to the eight antenna radiation units to a free space to form a uniform spherical field; and the broadband high-gain CTS omnidirectional antenna has the advantages of being simple to process, small in insertion loss, ultra-wideband (the relative bandwidth can reach 40%), stable and high in gain.

Description

technical field [0001] The invention relates to an omnidirectional antenna, in particular to a broadband high-gain CTS omnidirectional antenna. Background technique [0002] In wireless communication systems, omnidirectional antennas play an important role. Omnidirectional antenna is an antenna that can radiate energy uniformly in 360 degrees in the horizontal plane. It can be widely used in point-to-multipoint communication, broadcasting, data transmission, Set up wireless spread spectrum network and other fields. Dipole, monopole, biconical, dish, and loop antennas are the most widely used forms of omnidirectional antennas, however, their gain is too low for most omnidirectional antenna elements to meet many requirements for high gain Wireless application requirements covering large areas. At present, in order to increase the gain of omnidirectional antennas, antenna arrays are often used. The most widely used omnidirectional array is a collinear array, which consists o...

AI Technical Summary

Problems solved by technology

The omnidirectional antenna is simple to process, but in order to improve the uniform distribution of energy in the horizontal plane, 4 columns of printed dipoles and feed line arrays are placed on the angle bisector of the corner reflector, so that the relative bandwidth is only 18.9%, and in its Within the working frequency band, due to the large insertion loss of the 4 rows of printed dipoles fed into the linear array, the radiation characteristics of the antenna are affected, so that the gain stability of the omnidirectional antenna is poor

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