GB1460598A - Rejection filter in the uhf range - Google Patents

Rejection filter in the uhf range

Info

Publication number
GB1460598A
GB1460598A GB1054374A GB1054374A GB1460598A GB 1460598 A GB1460598 A GB 1460598A GB 1054374 A GB1054374 A GB 1054374A GB 1054374 A GB1054374 A GB 1054374A GB 1460598 A GB1460598 A GB 1460598A
Authority
GB
United Kingdom
Prior art keywords
shifting means
phase shifting
output
delay
fingers
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.)
Expired
Application number
GB1054374A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1460598A publication Critical patent/GB1460598A/en
Expired 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
    • H03H9/46—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
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02818—Means for compensation or elimination of undesirable effects
    • H03H9/02874—Means for compensation or elimination of undesirable effects of direct coupling between input and output transducers

Landscapes

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

Abstract

1460598 Filters PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 8 March 1974 [10 March 1973] 10543/74 Heading H3U A U.H.F filter, which rejects a channel whose width is less than 10<SP>-4</SP> times the frequency of that channel, comprises phase shifting means in parallel with one or more surface wave delay lines between input E and output A. As shown in Fig. 4 the phase shifting means may be constituted by an RC network 4,5 whose output may be adjusted in amplitude and phase. Alternatively the phase shifting means may comprise a further surface wave line whose delay is much shorter than the other delay line(s). When a plurality of substantial delay lines are provided the filter characteristic in the neighbourhood of the rejection frequency can be influenced. The substantial delay line shown in Fig. 3 includes an input interdigital transducer having a first set of fingers 1 which emits waves in both directions and is spaced at a distance of #/4 from a further set of fingers 1<SP>1</SP> which acts as a reflector. Output transducer 2, 2<SP>1</SP> has a similar configuration.
GB1054374A 1973-03-10 1974-03-08 Rejection filter in the uhf range Expired GB1460598A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732312057 DE2312057A1 (en) 1973-03-10 1973-03-10 ACOUSTIC SURFACE WAVE CHAMBER FILTER

Publications (1)

Publication Number Publication Date
GB1460598A true GB1460598A (en) 1977-01-06

Family

ID=5874449

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1054374A Expired GB1460598A (en) 1973-03-10 1974-03-08 Rejection filter in the uhf range

Country Status (2)

Country Link
DE (1) DE2312057A1 (en)
GB (1) GB1460598A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1132211A (en) * 1978-02-23 1982-09-21 Martin Redwood Acoustic wave devices
FR2426979A1 (en) * 1978-05-25 1979-12-21 Quartz & Electronique QUARTZ BLADES FOR SURFACE WAVES

Also Published As

Publication number Publication date
DE2312057A1 (en) 1974-09-12

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee