Improved structure of wideband omnidirectional antenna

Abstract

The invention discloses an improved structure of a wideband omnidirectional antenna, which comprises a shunt-fed wideband feed network and a plurality of groups of wideband vibrator sets connected with the shunt-fed wideband feed network, wherein all wideband vibrator sets respectively comprise first radiator, second radiator and parasitical vibrator which are sequentially arranged; choking tubesare respectively arranged on the heads and the ends of all wideband vibrator sets; the first radiators, the second radiators, the parasitical vibrators and the choking tubes are respectively in collinear connection and fixed on a metal support tube; an inner conductor of a coaxial feeder of the shunt-fed wideband feed network is respectively and electrically connected with the first radiators or the second radiators of various wideband vibrator sets; and an outer conductor of the coaxial feeder is electrically connected with the metal support tube. The improved structure has the advantages that: as the radiators, the parasitical vibrators, the choking tubes and the metal support tubes are collinearly arrayed and the coaxial feeder is integrated inside the radiators, the unroundness of theantenna is good and the small-sized integration of the antenna volume is realized while meeting wideband low standing wave and the shunt-fed wideband feed network improves the signal quality of the covering area while resisting the interference.

Description

technical field [0001] The invention relates to a broadband omnidirectional antenna, which is suitable for outdoor base stations or repeaters of broadband digital TV MUDS, CDMA, and GSM mobile communications. technical background [0002] Generally, the omnidirectional antennas used in U-band TV channels are relatively large in size, and are usually composed of multiple flat-panel antennas. The feeding network is very complicated, the bandwidth is narrow, the cost is high, and the installation is inconvenient. During the installation process of the antenna, the requirements for the quality of the installers and the installation conditions are relatively high, and a slight error will directly affect the coverage effect. The assembled omnidirectional antenna will form an interference area between multiple planar antennas, and the horizontal pattern is in the shape of a lotus flower. The out-of-roundness is usually greater than 4dB, and it is very difficult to achieve an out-of...

AI Technical Summary

Problems solved by technology

[0002] Generally, the omnidirectional antennas used in U-band TV channels are relatively large in size, and are usually composed of multiple flat-panel antennas. The feeding network is very complicated, with narrow bandwidth and high cost. It is inconvenient to install.

During the installation process of the antenna, the requirements for the quality of the installers and the installation conditions are relatively high, and a slight error will directly affect the coverage effect

This assembled omni-directional antenna will form an interference area between multiple flat-panel antennas. The horizontal plane pattern is lotus-shaped, and the out-of-roundness is usually greater than 4dB. It is very difficult to achieve an out-of-roundness within 1dB.

With the vigorous development of terrestrial digital TV, this type of antenna can no longer meet the requirements of small antenna size, high gain, and wide bandwidth; at the same time, with more and more MUDS digital TV sites, the interference between sites will become more and more serious. To meet the coverage requirements without interfering with other sites, this requires the antenna to be able to flexibly adjust the direction and downtilt angle, which cannot be achieved by current antennas

Images