Wideband high gain 3G or 4G antenna

摘要

A broadband antenna element for RF transmission and reception over cellular frequencies. The antenna element is formed of conductive material on a substrate surface of conductive material in the form of a pair of half portions extending in opposite directions to distal tips defining the widest distance of a mouth of a cavity. The mouth converges to reduce in cross-section to a narrowest point at a plurality of different flare angles defined by the edges of the two half portions in between the pair of half portions forming the element. The resulting antenna element radiates and receives a wide band cellular frequencies enabling a single element to serve different providers operating on different frequency bands in the cellular spectrum between 680 MHz to 1900 MHz.

主权项

1. A flat planar broadband antenna comprising:
a substrate; a first substrate surface having a first planar surface, a portion of said first planar surface of said substrate being covered with a conductive material and a portion of which being uncovered; said conductive material forming an antenna element having two half portions, each of said half portions having a substantially equal area of said conductive material, positioned on opposite sides of a cavity therebetween formed by said uncovered portion; said cavity having a mouth area adjacent to a first edge of said substrate and extending between respective opposing side edges of both said half portions; said cavity having a cross section diminishing in size from a widest point closest to said first side edge, to a narrowest point closest to a second edge of said substrate, opposite said first edge; a first linear edge portion of said side edges defining a first flare angle portion of both of said side edges in a first portion of said cavity extending between said mouth and two opposing first points on said side edges; a second portion of said cavity defined by opposing curved portions of said side edges extending from said respective first points on said side edges, to said narrowest point of said cavity; said second portion of said cavity providing means to improve performance in a midrange of said antenna between a highest frequency determined by said narrowest point and lowest frequency determined by said widest point; a curvilineal cavity extending from said narrowest point in a direction substantially parallel to said first edge, toward a side edge of said substrate communicating between said first edge and said second edge; and a feed line positioned on a second planar surface of said substrate on an opposite side of said substrate from said first planar surface, said feed line being electrically connected to the conductive material of one of said two half portions of said antenna element.