Coplanar waveguide transition for multi-band impedance matching

Patent metadata

Field	Value
Publication number	US-2017093041-A1
Application number	US-201514871877-A
Country	US
Kind code	A1
Filing date	Sep 30, 2015
Priority date	Sep 30, 2015
Publication date	Mar 30, 2017
Grant date	—

Abstract

A microstrip antenna including a first substrate, a ground plane disposed on a first side of the first substrate, a first conductive layer disposed on a second side of the first substrate, wherein the first conductive layer is configured to resonate at a first frequency, a second substrate disposed on the first conductive layer, a second conductive layer disposed on a side of the second substrate, wherein the second conductive layer is configured to resonate at a second frequency, a first feed portion extending through the first substrate, and configured to provide first excitation signals to the first conductive layer, a second feed portion extending through the second substrate, wherein the second feed portion is configured to provide second excitation signals to the second conductive layer, and a conductive strip disposed in the first conductive layer and electrically connecting the first feed portion and the second feed portion.

First claim

What is claimed as new and desired to be protected by Letters Patent of the United States is:

1 . A microstrip antenna comprising:
a first substrate; a ground plane disposed on a first side of the first substrate; a first conductive layer disposed on a second side of the first substrate, opposite the first side, wherein the first conductive layer is configured to resonate at a first frequency; a second substrate disposed on the first conductive layer, opposite the first substrate; a second conductive layer disposed on a side of the second substrate opposite the first conductive layer, wherein the second conductive layer is configured to resonate at a second frequency, the second frequency being different than the first frequency; a first feed portion extending through the first substrate, wherein the first feed portion is configured to provide first excitation signals to the first conductive layer; a second feed portion extending through the second substrate, wherein the second feed portion is configured to provide second excitation signals to the second conductive layer; and a conductive strip disposed in the first conductive layer and electrically connecting the first feed portion and the second feed portion.

2 . The microstrip antenna of claim 1 , wherein the second conductive layer is configured to resonate at the second frequency in response to a signal propagated through the first feed portion, the conductive strip, and the second feed portion.

3 . The microstrip antenna of claim 1 , wherein the conductive strip is electrically insulated from surrounding portions of the first conductive layer.

4 . The microstrip antenna of claim 1 , wherein the first feed portion comprises a first diameter and the second feed portion comprises a second diameter, the second diameter being different than the first diameter.

5 . The microstrip antenna of claim 1 , wherein an axis of the first feed portion is offset from an axis of the second feed portion.

6 . The microstrip antenna of claim 1 , wherein the first and second conductive layers are concentric about an axis, the first feed portion is disposed at a first distance from the axis, and the second feed portion is disposed at a second distance from the axis, different than the first distance.

7 . The microstrip antenna of claim 6 , wherein the first frequency is lower than the second frequency and the first distance is greater than the second distance.

8 . The microstrip antenna of claim 1 , wherein the first feed portion and the second feed portion comprise metal plated vias.

9 . The microstrip antenna of claim 1 , wherein the first feed portion is configured to provide impedance matching for the first conductive layer at the first frequency and the second feed portion is configured to provide impedance matching for the second conductive layer at the second frequency.

10 . The microstrip antenna of claim 9 , comprising a feed structure, the feed structure comprising an input portion, the first portion, the second portion, and the conductive strip, wherein the feed structure is configured to:
provide impedance matching between a 50 Ohm input impedance at the input portion to a first impedance of the first conductive layer at the first frequency; and provide impedance matching between the 50 Ohm input impedance at the input portion to a second impedance of the second conductive layer at the second frequency.

Assignees

• Mitre Corp

Inventors

• Mcmichael Ian T

Classifications

• H01Q9/0414 Primary

  in a stacked or folded configuration · CPC title

• H01Q9/0435

  using two feed points · CPC title

• H01Q9/0464

  Annular ring patch · CPC title

• H01Q5/40

  Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements · CPC title