US 5,962,950 A · Compact surface acoustic wave apparatus, spread spectrum signal receiver using the same apparatus for reception of spread spectrum signal, and spread spectrum signal communication system using the same spread spectrum signal receiver

Abstract

In a surface acoustic wave apparatus, a surface acoustic wave element for obtaining a convolution signal is housed in a recess of a substrate. Since the surface acoustic wave element is housed in the recess of the substrate in this surface acoustic wave apparatus, the apparatus can be compactified. This effect of compactification is remarkable, because the surface acoustic wave element has an output electrode for obtaining the convolution signal and thus originally has a big element size. When a laminate substrate is used as the substrate, a configuration for effectively using surfaces of respective layers may be arranged in such a manner that output wiring of the convolution signal is separately formed in the layers. This further enhances the effect of compactification. There are further disclosed a spread spectrum signal receiver using the above surface acoustic wave apparatus for receiving a spread spectrum signal, and a spread spectrum communication system using the spread spectrum signal receiver.

Claims15

Dependent claims

A surface acoustic wave apparatus comprising:

a first substrate having a piezo-electric property;
first and second input electrodes, disposed on a first surface of said first substrate, for exciting first and second surface acoustic waves;
an output electrode for exciting a convolution signal of the first and second surface acoustic waves by nonlinear effect;
a second substrate having a recess in which said first substrate is housed;
and
a strip pattern comprising a conductive film on said second substrate,
wherein said strip pattern has plural input terminals respectively connected electrically to plural sections of said output electrode, and a signal output terminal for synthesizing signals from said input terminals to derive the convolution signal, said strip pattern being formulated into plural stages, each stage combining outputs from two prior stages, and times for signals from respective sections of said output electrode to reach said output terminal of said strip pattern are equal.

4 more elements

Dependencies are inferred from the claim text.

Compact surface acoustic wave apparatus, spread spectrum signal receiver using the same apparatus for reception of spread spectrum signal, and spread spectrum signal communication system using the same spread spectrum signal receiver

Life of this patent

Compact surface acoustic wave apparatus, spread spectrum signal receiver using the same apparatus for reception of spread spectrum signal, and spread spectrum signal communication system using the same spread spectrum signal receiver

Life of this patent

Abstract

Claims15