[go: up one dir, main page]

JPS55128913A - Piezoelectric band pass filter - Google Patents

Piezoelectric band pass filter

Info

Publication number
JPS55128913A
JPS55128913A JP3642279A JP3642279A JPS55128913A JP S55128913 A JPS55128913 A JP S55128913A JP 3642279 A JP3642279 A JP 3642279A JP 3642279 A JP3642279 A JP 3642279A JP S55128913 A JPS55128913 A JP S55128913A
Authority
JP
Japan
Prior art keywords
coils
equal
pass filter
band pass
jaumann
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3642279A
Other languages
Japanese (ja)
Inventor
Hiromasa Ishii
Kuichi Kubo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nihon Dempa Kogyo Co Ltd
Original Assignee
Nihon Dempa Kogyo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nihon Dempa Kogyo Co Ltd filed Critical Nihon Dempa Kogyo Co Ltd
Priority to JP3642279A priority Critical patent/JPS55128913A/en
Publication of JPS55128913A publication Critical patent/JPS55128913A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/542—Filters comprising resonators of piezoelectric or electrostrictive material including passive elements

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

PURPOSE:To secure the equal application voltage for each piezoelectric element and thus increase the performance of the band pass filter, by providing the tuning capacitors of different capacities between the terminals of the differential transformer of the Jaumann-type piezoelectric BPF. CONSTITUTION:The secondary coil L2 of differential transformr L of Jaumann-type piezoelectric BPF is formed with coils L21 and L22. Then tuning capacitors C1 and C2 are provided to both ends of coils L21 and L22 each. Thus the serial resonance circuit is formed with coils L21 and L22 plus capacitors C1 and C2 each. Here the resonance frequency of the above resonance circuit is synchronized with the central frequency of the filter, and both C1 and C2 are controlled in case secondary side voltage V2 is not equal to V3. As a result, the equal absolute value is obtained between V2 and V3. In such way, the unbalanced voltage component due to the unbalance between the coils can be negated, thus eliminating the characteristic deterioration caused by the unbalanced voltage component. Thus the good attenuation characteristics can be obtained over a wide band.
JP3642279A 1979-03-28 1979-03-28 Piezoelectric band pass filter Pending JPS55128913A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3642279A JPS55128913A (en) 1979-03-28 1979-03-28 Piezoelectric band pass filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3642279A JPS55128913A (en) 1979-03-28 1979-03-28 Piezoelectric band pass filter

Publications (1)

Publication Number Publication Date
JPS55128913A true JPS55128913A (en) 1980-10-06

Family

ID=12469381

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3642279A Pending JPS55128913A (en) 1979-03-28 1979-03-28 Piezoelectric band pass filter

Country Status (1)

Country Link
JP (1) JPS55128913A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR20050100595A (en) * 2005-10-06 2007-05-23 Νικολαος Σταθοπουλος Double crystal with high frequencies of fundamental oscillation frequency.
WO2010150037A1 (en) * 2009-06-26 2010-12-29 Smartcom Bulgaria Ad Filter circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR20050100595A (en) * 2005-10-06 2007-05-23 Νικολαος Σταθοπουλος Double crystal with high frequencies of fundamental oscillation frequency.
WO2010150037A1 (en) * 2009-06-26 2010-12-29 Smartcom Bulgaria Ad Filter circuit

Similar Documents

Publication Publication Date Title
US2435630A (en) Tuned transformer assembly
JPS6489709A (en) Band width variable circuit
JPS55128913A (en) Piezoelectric band pass filter
JPS56711A (en) Antenna unit
JPS5658310A (en) Wide band distributor
JPS6478001A (en) Polarization circuit for dielectric filter
JPS6150333U (en)
US2249440A (en) Wave filter
JPS6454906A (en) Reception antenna
JPS562673A (en) Optical receiver circuit
US3155928A (en) Bridged-t frequency rejection filter
JPS56713A (en) Antenna unit
US2913682A (en) Hybrid type filter networks
SU837280A1 (en) Noise suppressing filter
SU637882A1 (en) Balanced transformer
JPS57103402A (en) Helical filter
JPS57103403A (en) Band-pass filter
JPS6478509A (en) Block filter
SU374709A1 (en) MAGNETIC FILTER
JPS588769B2 (en) piezoelectric bandpass filter
GB802006A (en) Improvements in or relating to crystal filters
SU792297A1 (en) Balanced transformer
JPS5824499Y2 (en) triple tuning transformer
JPS6035297Y2 (en) low pass filter
GB1262360A (en) Band-pass filters