Saw device with integral patch antenna
First Claim
1. A sensor assembly for providing an indication of a condition, the sensor assembly comprising:
- a SAW device which can be interrogated by radio frequency (RF) signals to provide an indication of the value of the condition; and
an antenna connected to the SAW device to receive RF signals from a remote interrogation device and pass the received signals to the SAW device, and to receive RF signals from the SAW device and transmit them to the remote interrogation device, wherein the antenna is a patch antenna and the antenna and SAW device are pre-formed as a unit which can be placed at a location where the condition is to be sensed for remote interrogation by the interrogation device.
1 Assignment
0 Petitions
Accused Products
Abstract
A sensor assembly, particularly suitable for use on a vehicle wheel to sense, e.g. the pressure within a vehicle tyre, comprises a patch antenna (3) and a SAW device (2). The patch antenna comprises conductive sheets (4, 5) of substantially equal surface area separated by a dielectric spacer (6). The SAW device may be located between the plates (3, 5) within the thickness of the dielectric material. The patch antenna may he secured to the wheel rim of a vehicle wheel so that one of the antenna plates is capacitively coupled to the metal of the wheel thereby forming an extended ground-plane. Such an arragement produces a low profile sensor/antenna combination which has a maxiumum gain in the radial direction of the wheel.
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Citations
10 Claims
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1. A sensor assembly for providing an indication of a condition, the sensor assembly comprising:
- a SAW device which can be interrogated by radio frequency (RF) signals to provide an indication of the value of the condition; and
an antenna connected to the SAW device to receive RF signals from a remote interrogation device and pass the received signals to the SAW device, and to receive RF signals from the SAW device and transmit them to the remote interrogation device, wherein the antenna is a patch antenna and the antenna and SAW device are pre-formed as a unit which can be placed at a location where the condition is to be sensed for remote interrogation by the interrogation device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a SAW device which can be interrogated by radio frequency (RF) signals to provide an indication of the value of the condition; and
Specification