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1. (WO2017036673) SAW FILTER
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2017/036673 International Application No.: PCT/EP2016/067654
Publication Date: 09.03.2017 International Filing Date: 25.07.2016
IPC:
H03H 9/64 (2006.01) ,H03H 9/02 (2006.01)
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
H
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9
Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
46
Filters
64
using surface acoustic waves
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
H
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
9
Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
02
Details
Applicants:
SnapTrack, Inc. [US/US]; 5775 Morehouse Drive San Diego, CA 92121, US
Inventors:
SCHULZ, Volker; DE
Agent:
BARDEHLE PAGENBERG PARTNERSCHAFT MBB; Postfach 86 06 20 81633 München, DE
Priority Data:
10 2015 114 751.303.09.2015DE
Title (EN) SAW FILTER
(FR) FILTRE À ONDES DE SURFACE
(DE) SAW FILTER
Abstract:
(EN) In order to avoid interfering resonance in the counter band of a SAW filter with a ladder type structure, it is proposed that the finger period of the parallel resonators is reduced and as a counter move, the parallel arms are switched to a corresponding inductance in order to expand the bandwidth back to the original value. The frequency of the secondary mode can move from the region of the counter band by moving the main resonance at the same time.
(FR) L'objet de l'invention est d'éviter une résonance parasite dans la contre-bande d'un filtre à ondes de surface à structure du type à échelle. À cet effet, la période de doigt des résonateurs parallèles est réduite et à l'inverse, les bras parallèles sont connectés à une inductance correspondante pour élargir à nouveau la largeur de bande et la ramener à sa valeur initiale. Le décalage de la résonance principale permet simultanément de décaler la fréquence du mode secondaire hors de la zone de la contre-bande.
(DE) Zur Vermeidung einer störenden Resonanz im Gegenband eines SAW Filters mit Ladder Type Struktur wird vorgeschlagen, die Fingerperiode der Parallelresonatoren zu verringern und im Gegenzug die Parallelarme mit einer entsprechenden Induktivität zu verschalten, um die Bandbreite wieder auf den ursprünglichen Wert zu erweitern. Mit der Verschiebung der Hauptresonanz gelingt es gleichzeitig, die Frequenz der Nebenmode aus dem Bereich des Gegenbands heraus zu verschieben.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: German (DE)
Filing Language: German (DE)