Surface wave devices
阅读：774发布：2021-12-01
专利汇可以提供Surface wave devices专利检索，专利查询，专利分析的服务。并且An acoustic filter for use in an FM receiver includes a body of piezoelectric material propagative of acoustic surface waves, a pair of surface wave interaction devices and a diode arranged as a discriminator.，下面是Surface wave devices专利的具体信息内容。
1. An acoustic filter system comprising: a body of piezoelectric material propagative of acoustic surface waves; at least three surface wave interaction devices actively coupled to assigned surface portions of said body and separated from one another in the direction of surface wave propagation and individually having maximum interactions with said body at assigned predetermined frequencies; a source of frequency modulated signals of a predetermined carrier frequency; means for coupling said source to one of said devices to launch acoustic surface waves on said body, said one device having a maximum interaction with said body at said carrier frequency; and means coupled to the remaining two devices for deriving energy from the launched acoustic surface waves for application to a load, said remaining two devices having maximum interactions with said body at frequencies higher and lower, respectively, than said carrier frequency.
2. An acoustic filter system in accordance with claim 1 in which said two remaining devices are coupled in a series circuit which also includes two reversely poled diodes and said load, with said load disposed between said diodes.
3. An acoustic filter system comprising: a body of piezoelectric material propagative of acoustic surface waves; a source of frequency modulated signals of predetermined carrier frequency; a pair of surface wave interaction devices coupled to spaced surface portions of said body and individually having a maximum interaction with said body at a frequency corresponding to said carrier frequency; means coupling said source across one of said devices; and means including a diode and a load for coupling said interaction devices in a series circuit.
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