Back to results
US 5,327,148 AGranted
Ferrite microstrip antenna
AssigneeNortheastern University
InventorsHoton How, Carmine Vittoria
Life of this patent
Estimating the term…
Abstract
A microstrip antenna includes a ferrite loaded substrate having a ground plane conductor disposed over a first surface thereof and having a strip conductor disposed over a second surface thereof. A DC magnetic field biasing circuit provides a directed DC magnetic field to the ferrite substrate such that the strip conductor radiates electromagnetic energy having circular polarization. In one embodiment, a ferrite material is disposed over the strip conductor to reduce the radar cross section of the antenna.
Claims21
A microstrip antenna comprising:
- a ferrite loaded substrate having first and second opposing surfaces;
- a ground plane conductor disposed over the first surface of said substrate;
- a strip conductor having a rectangular shape disposed over the second surface of said substrate;
- an RF feed circuit disposed on a first one of the first and second surfaces of said substrate and coupled to said first strip conductor;
- and
- a DC magnetic field biasing circuit for providing a DC magnetic field to said ferrite substrate wherein the DC magnetic field is provided in a plane parallel to a plane in which the ferrite substrate is disposed and wherein the direction of the DC magnetic field is perpendicular to said RF feed circuit.
3 more elements
A microstrip antenna comprising:
- a ferrite loaded substrate having first and second opposing surfaces and having a first permeability;
- a ground plane conductor disposed over the first surface of said substrate;
- a first antenna element disposed over the second surface of said substrate wherein said first antenna element is provided having a shape selected such that said first antenna element is responsive to electromagnetic energy at a first frequency;
- an RF feed circuit disposed on a first one of the first and second surfaces of said substrate and coupled to said first antenna element;
- a ferrite material disposed over said first antenna element wherein said ferrite material is selected having a second permeability wherein the second permeability is different than the first permeability of said ferrite substrate;
- and
- a DC magnetic field biasing circuit for providing a DC magnetic field in a direction normal to said ferrite substrate and said first antenna element.
4 more elements
Dependencies are inferred from the claim text.