Shunt-type omnidirectional antenna array of three frequency bands of GSM (Global System for Mobile Communications) 850/DCS (Digital Communication Service)/PCS (Personal Communication Service)

Abstract

The invention relates to a shunt-type omnidirectional antenna array of three frequency bands of GSM (Global System for Mobile Communications) 850 / DCS (Distributed Control System) / PCS (Personal Communication Service), belonging to the field of antenna designs. The antenna array is a three-frequency-band base station system used for supporting the GSM 850 (824-894MHz), the DCS (1,710-1,880MHz) and the PCS (1,850-1,990MHz) and has the advantages of miniaturization, omnidirectional coverage rate, low cost and high gain. The antenna array is characterized in that parallel feed networks are adoptedin parallel dual feed structures of both the front side and the back side of a printed circuit board, and the adopted parallel feed network can ensure all antenna array elements are excited in the same direction on the premise of no any phase shift, thereby the problem that a series-fed type array bandwidth is limited by the feed networks is solved. Meanwhile, a three-frequency-band omnidirectional array element is designed in a mode of chamfering a printed dipole, and a microstrip short-circuit line is connected to compensate the capacitive impedance of the DCS / PCS frequency bands, thus the high-gain omnidirectional base station antenna of three frequency bands of GSM 850 / DCS / PCS is realized. The antenna array has the advantages of compact structure, miniaturization, easy integration andflexible design and is suitable for the design of a miniature multi-frequency-band high-gain base station antenna of a GSM 850 / DCS / PCS system.

Description

technical field [0001] The invention relates to a parallel-feed omnidirectional antenna array design supporting GSM850 / DCS / PCS three frequency bands, which is especially used in multi-band, miniaturized and low-cost mobile communication base stations, and belongs to the field of antenna design of wireless communication technology. Background technique [0002] With the rapid development of mobile communication business in the world, mobile communication provides convenience and speed for people's work and life more and more. In the past ten years, the number of mobile users has been growing at an astonishing rate and will continue to grow rapidly, which requires larger and larger system capacity and higher and higher requirements for voice quality. The mobile communication system has developed from the first-generation AMPS, TACS, NMT and other systems, the second-generation GSM system and narrowband CDMA system, to the current third-generation mobile communication systems s...

AI Technical Summary

Problems solved by technology

In this way, for the series-fed array, all the elements do not work at the same time, and the radiation elements corresponding to different frequencies are different, so the size of the series-fed array is too large, and the gain fluctuation in the horizontal plane is large

In addition, this kind of serial feed network is very complex, the antenna working bandwidth is limited by the feed structure, and the direction of the main lobe will deviate from the horizontal plane as the frequency changes

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