MULTI-CHANNEL FILTER ON SURFACE ACOUSTIC WAVES Russian patent published in 2008 - IPC H03H9/64 

FIELD: radio technology.

SUBSTANCE: invention pertains to wireless communication and can be used for selecting radio signals in input cascades of radio receiving devices. The multi-channel filter on surface acoustic waves has input and output terminals, input and output commutators, each of which consists of N switches on the number of filter channels, with their control inputs, frequency-selective unit with an amplifier, between the input and output commutators and consisting of N channels, each of which has input and output filters on surface acoustic waves, channel input and output switches with their control inputs, first and second group electric bus lines. The input terminal is connected to the inputs of the switch of the input commutator, and the output terminal is connected to the outputs of the switch of the output commutator. There are N-1 amplifiers in the frequency-selective unit. In each channel of the frequency-selective unit the input of the amplifier is connected to the output of the input filter on surface acoustic waves of the first group electric bus line, and the output of the amplifier is connected to the input of the output filter on surface acoustic waves of the second group electric bus line. The input of the channel input switch is connected to the output of the corresponding switch of the input commutator, and the output of the channel input switch is connected to the input of the output filter on surface acoustic waves. The input of the channel output switch is connected to the output of the output filter on surface acoustic waves, and the channel output switch is connected to the input of the corresponding switch of the output commutator. In that case the length of the first and second group electric bus lines does not increase with increase in the number of channels and the central frequency of the input and output filters on surface acoustic waves.

EFFECT: design of a multi-channel filter on surface acoustic waves, providing for lowering distortions of the amplitude-frequency response.

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