IP Library › Granted Patent US 7,444,878
Granted Patent B1
US 7,444,878 · App. 11/554,116 · Granted Nov 4, 2008

Resonant frequency pressure sensor

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Quick Facts
Patent No.
US 7,444,878
App. No.
11/554,116
Granted
Nov 4, 2008
Kind
B1
Abstract

A pressure sensor (S) includes an antenna member ( 10 ) that is adapted to be resonantly responsive to a desired frequency of electromagnetic radiation ( 12 ). An inductance changing body formed from a compressible dielectric material ( 14 ) is positioned in proximity to the antenna member ( 10 ). A housing member ( 16 ) houses the antenna member ( 10 ) in a desired proximity to the compressible dielectric material ( 14 ). The compression of the dielectric material ( 14 ) changes the effective dielectric constant of the antenna ( 10 ).

Claims (7)

1. A pressure sensor comprising:

an antenna member adapted to be resonantly responsive to a desired frequency of electromagnetic radiation;

a compressible dielectric material having an effective dielectric constant positioned in proximity to the antenna member and operably connected with the antenna member for effecting a resonant frequency shift in the antenna member responsive to changes in the effective dielectric constant of the compressible dielectric material; and,

a housing member for housing the antenna member in a desired proximity to the compressible dielectric material.

2. The invention of claim 1 wherein the compressible dielectric material comprises a resilient material.

3. The invention of claim 2 wherein the resilient material is Polyvinylidene Fluoride foam.

4. The invention of claim 1 wherein the antenna member is a micro-strip antenna.