KR980006828A - Surface acoustic wave filter with improved insertion loss - Google Patents

Surface acoustic wave filter with improved insertion loss Download PDF

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Publication number
KR980006828A
KR980006828A KR1019960024634A KR19960024634A KR980006828A KR 980006828 A KR980006828 A KR 980006828A KR 1019960024634 A KR1019960024634 A KR 1019960024634A KR 19960024634 A KR19960024634 A KR 19960024634A KR 980006828 A KR980006828 A KR 980006828A
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KR
South Korea
Prior art keywords
acoustic wave
surface acoustic
wave filter
reflectors
piezoelectric substrate
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Application number
KR1019960024634A
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Korean (ko)
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KR100213376B1 (en
Inventor
차승용
Original Assignee
이형도
삼성전기 주식회사
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Priority to KR1019960024634A priority Critical patent/KR100213376B1/en
Publication of KR980006828A publication Critical patent/KR980006828A/en
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Publication of KR100213376B1 publication Critical patent/KR100213376B1/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/05—Holders; Supports
    • H03H9/058—Holders; Supports for surface acoustic wave devices
    • H03H9/059—Holders; Supports for surface acoustic wave devices consisting of mounting pads or bumps
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/13—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/25—Constructional features of resonators using surface acoustic waves

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

본 발명은 삽입손실을 개선한 탄성표면파필터에 관한 것으로, 특히 탄성표면파필터의 변환기에서 좌우측 양방향으로 반사되는 손실파를 포물선형반사기로 방지하도록 함으로써 탄성표면파필터의 삽입손실을 개선하는 삽입손실을 개선한 탄성표면파필터에 관한 것이다. 본 발명은 압전체기판(1)에 입력/출력변환기가 형성되고, 상기 압전체기판(1)상의 입력/출력본딩패드(11,14)와 상기 입력/출력변환기의 입력/출전극(12.13)을 와이어로 접속하며, 상기 압전체기판(1) 양측부에는 반사기(22,24)가 형성되어 있는 탄성표면파필터에 있어서, 상기 압전체기판(1)상에 형성된 반사기(22,24)외측부 각각에 적어도 하나를 형성한 포물선형 반사기 (32,34)를 구비한 것이다.The present invention relates to a surface acoustic wave filter with improved insertion loss, and more particularly, to a parabolic reflector for preventing loss waves reflected in both left and right directions in a transducer of a surface acoustic wave filter, thereby improving insertion loss To a surface acoustic wave filter. Output bonding pads 11 and 14 on the piezoelectric substrate 1 and input / output electrodes 12.13 of the input / output transducer are connected to a wire (not shown) And at least one of the reflectors 22 and 24 is formed on each of the outer sides of the reflectors 22 and 24 formed on the piezoelectric substrate 1 in the surface acoustic wave filter in which reflectors 22 and 24 are formed on both sides of the piezoelectric substrate 1. [ And the parabolic reflectors 32 and 34 are formed.

Description

삽입손실을 개선한 탄성표면파 필터Surface acoustic wave filter with improved insertion loss

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제 5 도는 본 발명과 종래의 탄성표면파필터에 대한 주파수특성 비교도.FIG. 5 is a frequency characteristic comparison example of the present invention and a conventional surface acoustic wave filter.

Claims (6)

압전체기판 (1)에 입력/출력변환기가 형성되고, 상기 압전체기판(1)상의 입력/출력 본딩패드(11,14)와 상기 입력/출력변환기의 입력/출전극(12,13)을 와이어로 접속하며, 상기 압전체기판(1) 양측부에는 반사기(22,24)가 형성되어 있는 탄성표면파필터에 있어서, 상기 압전체기판(1)상에 형성된 반사기 (22,24) 외측부 각각에 적어도 하나를 형성한 포물선형 반사기 (32,34)를 구비함을 특징으로하는 삽입손실을 개선한 탄성표면파필터.The input / output bonding pads 11 and 14 on the piezoelectric substrate 1 and the input / output electrodes 12 and 13 of the input / output converter are connected to the piezoelectric substrate 1 by wires (22, 24) are formed on both sides of the piezoelectric substrate (1), characterized in that at least one of the outer sides of the reflectors (22, 24) formed on the piezoelectric substrate (1) is formed And a parabolic reflector (32, 34). 제1항에 있어서, 상기 포물선형반사기에 의해서 형성되는 촛점위치(P)를 입력/출력변환기내에 형성하는 것을 특징으로 하는 삽입손실을 개선한 탄성표면파필터.The surface acoustic wave filter according to claim 1, wherein the focal position (P) formed by the parabolic reflector is formed in the input / output converter. 제 1 항에 있어서, 상기 압전체기판(1)상의 포물선형반사기(32,34)의 외측부에 적어도 하나를 형성한 보조 포물선형반사기(32a~32c)(34a~34c)를 더 구비함을 특징으로 하는 삽입손실을 개선한 탄성표면파필터.The parabolic reflector according to claim 1, further comprising auxiliary parabolic reflectors (32a to 32c) (34a to 34c) provided on the outer side of the parabolic reflectors (32, 34) on the piezoelectric substrate (1) A surface acoustic wave filter with improved insertion loss. 제1항 및 제3항에 있어서, 상기 포물선형반사기(32,34)와 보조 포물선형반사기(32a~32c)(34a~34c)의 폭을 탄성표면파필터에 의한 공진주파수의 λ/4에 해당하도록 형성하는 것을 특징으로 하는 삽입손실을 개선한 탄성표면파필터.4. The filter according to claim 1 or 3, wherein the widths of the parabolic reflectors (32,34) and the auxiliary parabolic reflectors (32a-32c) (34a-34c) correspond to? / 4 of the resonance frequency by the surface acoustic wave filter The surface acoustic wave filter having an insertion loss improved. 제1항 및 제3항에 있어서, 상기 포물선형반사기(32,34)와 보조 포물선형반사기(32a~32c)(34a~34c)의 직선길이를 바람직하게는 탄성표면파필터에 의한 공진주파수의 5λ에서 20λ사이의 파장에 해당하도록 형성하는 것을 특징으로 하는 삽입손실을 개선한 탄성표면파필터.The resonator as claimed in claim 1 or 3, wherein the linear lengths of the parabolic reflectors (32, 34) and the auxiliary parabolic reflectors (32a to 32c) (34a to 34c) To 20 < RTI ID = 0.0 > lambda. ≪ / RTI > 제5항에 있어서, 상기 포플선형반사기(32,34)와 보조 포물선형반사기(32a~32c)(34a~34c)의 직선길이를 보다 바람직하게는 탄성표면파필터에 의한 공진주파수의 10λ에서 15λ사이의 파장에 해당하도록 형성하는 것을 특징으로 하는 삽입손실을 개선한 탄성표면파필터.6. The surface acoustic wave filter according to claim 5, wherein the straight lengths of the poplar linear reflectors (32, 34) and the auxiliary parabolic reflectors (32a to 32c) (34a to 34c) Of the surface acoustic wave filter (1). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019960024634A 1996-06-27 1996-06-27 Saw filter KR100213376B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019960024634A KR100213376B1 (en) 1996-06-27 1996-06-27 Saw filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960024634A KR100213376B1 (en) 1996-06-27 1996-06-27 Saw filter

Publications (2)

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KR980006828A true KR980006828A (en) 1998-03-30
KR100213376B1 KR100213376B1 (en) 1999-08-02

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