DUAL-MODE SURFACE WAVE FILTER WITH IMPROVED SYMMETRY AND INCREASED REVERSE ATTENUATION

DUAL-MODE SURFACE WAVE FILTER WITH IMPROVED SYMMETRY AND INCREASED REVERSE ATTENUATION

The device has at least one acoustic track on a piezoelectric substrate with a number of n first interdigital converters (110,160) as a signal input or output and n+1 second interdigital converters (121,122;171,172) as a signal output or input. The interdigital converters are arranged between at lea...

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Hauptverfasser: HAGN, PETER, SELMEIER, PETER
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
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creator HAGN, PETER
SELMEIER, PETER
description The device has at least one acoustic track on a piezoelectric substrate with a number of n first interdigital converters (110,160) as a signal input or output and n+1 second interdigital converters (121,122;171,172) as a signal output or input. The interdigital converters are arranged between at least two reflector structures (131,132) bounding the acoustic track. At least one acoustic track (190) has a central converter split into sub-converters (161,162) symmetrically with respect to the perpendicular to the propagation direction and connected to a housing with connecting pads or pins so as to give symmetrical connection occupancy. Independent claims are also included for the following: the use of the filter in asymmetrical/symmetrical mode and the use in symmetrical/asymmetrical mode.
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subjects BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
title DUAL-MODE SURFACE WAVE FILTER WITH IMPROVED SYMMETRY AND INCREASED REVERSE ATTENUATION
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