Cross feed broad-band omnidirectional antenna

Abstract

This invention discloses a cross feed broadband all-around antenna, which applies dual face copper coat to print on a microwave dielectric plate to form an upper antenna unit and a lower antenna unit with metal through holes, in which, the upper antenna unit is composed of a connecting line, radiation unit A and radiation unit B, a feed port is set on the connecting line, the lower antenna unit is composed of a connecting line, radiation unit A and radiation unit B and a feed port is set on the connecting line, radiation unit A of the upper layer antenna unit and that of the lower antenna constitute a symmetric element antenna radiation device A of a capacitive load and radiation unit B of the upper layer antenna unit and that of the lower layer antenna unit make up of a capacitive loaded symmetric element antenna radiation device B, the connecting lines of the two layer antenna units make up of a parallel wide edge couple crewel to crossly feed devices A and B.

Description

technical field [0001] The invention relates to an antenna printed on a dielectric board, more particularly, to a cross-fed broadband omnidirectional antenna with a capacitive load radiation unit. Background technique [0002] Printed antenna has unique advantages such as low profile, easy processing, low cost, and can be integrated with active devices, so it has a wide range of applications and has aroused great interest. The research on printed antennas has developed rapidly and has become an important research direction in the field of antennas. [0003] The common disadvantage of printed antennas is their narrow bandwidth, which limits their application in broadband situations. How to broaden the bandwidth is an important research content. Currently proposed technologies include thickening the substrate or using a thick air medium; using the relative permittivity ε r Substrates with small or large loss tangent tanδ, capacitive feeding (impedance matching); wedge-shaped...

AI Technical Summary

Problems solved by technology

These technologies often have defects in some aspects or have limited frequency band expansion effects. For example, the use of thick substrates is easy to excite surface waves; the addition of passive patches and the use of multi-layer structures will increase the size of the antenna, increase processing difficulty, and increase costs; It will deteriorate the antenna directivity and cross-polarization performance; resistive loading will increase the loss of the antenna, etc.

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