US 6,549,166 B2 · Four-port patch antenna

Abstract

A patch antenna is disclosed having four ports for circular polarization that suppress the TM-02 mode, resulting in a radiation pattern that is symmetric. The axial ratio performance is consequently superior to that of two-port patch antennas. A four-port patch antenna includes a patch made of an electrically conductive material, a patch substrate coupled to the patch wherein the patch substrate is made of a dielectric material, a ground plane coupled to the patch substrate wherein the ground plane is made of an electrically conductive material having at least four slots formed therein, a feed substrate coupled to the ground plane wherein the feed substrate is made of a dielectric material, and a hybrid network coupled to the feed substrate that includes a right hand circularly polarized port, a left hand circularly polarized port, and two matched terminated ports.

Claims18

Dependent claims

A patch antenna comprising:

a patch made of an electrically conductive material;
a patch substrate coupled to the patch wherein the patch substrate is made of an electrically insulating material;
a ground plane coupled to the patch substrate wherein the ground plane is made of an electrically conductive material having at least four slots formed therein;
a feed substrate coupled to the ground plane wherein the feed substrate is made of an electrically insulating material;
and
a hybrid network coupled to the feed substrate wherein the hybrid network comprises:
a right hand circularly polarized port;
a left hand circularly polarized port;
and
two matched terminated ports coupled to the right hand circularly polarized port and the left hand circularly polarized port.

7 more elements

Dependencies are inferred from the claim text.

Four-port patch antenna

Life of this patent

Four-port patch antenna

Life of this patent

Abstract

Claims18