JPS54125948A - Impedance element - Google Patents

Impedance element

Info

Publication number
JPS54125948A
JPS54125948A JP3366178A JP3366178A JPS54125948A JP S54125948 A JPS54125948 A JP S54125948A JP 3366178 A JP3366178 A JP 3366178A JP 3366178 A JP3366178 A JP 3366178A JP S54125948 A JPS54125948 A JP S54125948A
Authority
JP
Japan
Prior art keywords
coefficiency
surface wave
elastic surface
electricity
curve
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
JP3366178A
Other languages
Japanese (ja)
Inventor
Yahei Oyamada
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP3366178A priority Critical patent/JPS54125948A/en
Publication of JPS54125948A publication Critical patent/JPS54125948A/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 devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices

Abstract

PURPOSE:To obtain the impedance characteristics the absolute value of which increases suddenly and monotonously from the VHF through UHF bands by selecting the thickness of the electrode finger so that the relfective coefficient of the elastic surface wave may be larger than the electricity- machine combination coefficiency of the piezoelectric substrate. CONSTITUTION:The constitution of the transducer is equivalent to that in which a number of transducers T' are arranged in sequence. In case the amplitude ratio between incident elastic surface wave (a) into T' and reflected elastic surface wave (b), i.e., the reflective coefficient due to T' is larger and the electricity-machine combination coefficiency, the real number component of the admittance viewed between electrode E1 and E2 becomes as shown by curve I with imaginary number component B shown by curve II respectively. Thus, the absolute value ¦Z¦ (curve 50) of the impedance viewed between E1 and E2 features the minimum value at frequency fr and the maximum value at frequency fa are increases monotonously between fr-fa with no waving at all, obtaining good impedance characteristics. The proper selection of thickness Di of electrode finger ei of E1 and E2 results to obtaining the reflective coefficiency of T' caused by the elastic surface wave larger than the electricity-machine combination coefficiency of substrate 1.
JP3366178A 1978-03-24 1978-03-24 Impedance element Pending JPS54125948A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3366178A JPS54125948A (en) 1978-03-24 1978-03-24 Impedance element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3366178A JPS54125948A (en) 1978-03-24 1978-03-24 Impedance element

Publications (1)

Publication Number Publication Date
JPS54125948A true JPS54125948A (en) 1979-09-29

Family

ID=12392622

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3366178A Pending JPS54125948A (en) 1978-03-24 1978-03-24 Impedance element

Country Status (1)

Country Link
JP (1) JPS54125948A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60140918A (en) * 1983-12-28 1985-07-25 Toshiba Corp Surface acoustic wave resonator
JP2007239953A (en) * 2006-03-10 2007-09-20 Jtekt Corp Universal joint

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60140918A (en) * 1983-12-28 1985-07-25 Toshiba Corp Surface acoustic wave resonator
JP2007239953A (en) * 2006-03-10 2007-09-20 Jtekt Corp Universal joint

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