Quantcast

Low cross-polarization microstrip patch radiator

Imported: 24 Feb '17 | Published: 10 Jun '03

Raymond L. Lovestead

USPTO - Utility Patents

Abstract

A microstrip patch radiator has parallel conductive strips that are connected at opposite ends by conductive connecting strips and separated by slits. The slits are parallel to the direction of the desired patch currents, and perpendicular to the undesired currents, to provide a low impedance path for currents generating the desired antenna polarization, and a high impedance path for orthogonal currents generating the undesired, cross-polarized radiation of the patch.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Details of this invention are described in connection with the accompanying drawings that bear similar reference numerals in which:

FIG. 1A is a top view of a square radiator embodying features of the present invention.

FIG. 1B is a top view of a rectangular radiator embodying features of the present invention.

FIG. 1C is a top view of a circular radiator embodying features of the present invention.

FIG. 2 is a side view of an antenna with a radiator embodying features of the present invention.

FIG. 3 is a perspective view of two inductively coupled radiators embodying features of the present invention.

Claims

1. A low cross-polarization microstrip patch radiator comprising:

2. The radiator as set forth in claim 1 including from 4 to 50 of said slits.

3. The radiator as set forth in claim 1 wherein said first connecting portion, said second connecting portion and said conductive strips have radiator width measured perpendicular to said slits, and

4. The radiator as set forth in claim 1 wherein said first connecting portion, said second connecting portion and said conductive strips form a rectangular shape having a radiator length measured parallel to said slits, and

5. The radiator as set forth in claim 1 wherein said first connecting portion, said second connecting portion and said conductive strips form a circular shape having a diameter, with said first and second connecting portions forming portions of an annular band, and

6. The radiator as set forth in claim 1 including a microstrip feed connected to said first connecting portion, opposite said strips.

7. The radiator as set forth in claim 1 including a coaxial feed probe connected to said first connecting portion.

8. The radiator as set forth in claim 1 wherein said first connecting portion, said second connecting portion and said conductive strips are a single piece of conductive material with said slits being between said strips.

9. A low cross-polarization microstrip patch radiator comprising: