GB581173A - Improvements in band pass filters for ultra-high frequencies - Google Patents

Improvements in band pass filters for ultra-high frequencies

Info

Publication number
GB581173A
GB581173A GB1210942A GB1210942A GB581173A GB 581173 A GB581173 A GB 581173A GB 1210942 A GB1210942 A GB 1210942A GB 1210942 A GB1210942 A GB 1210942A GB 581173 A GB581173 A GB 581173A
Authority
GB
United Kingdom
Prior art keywords
coupled
band
conical
arrangement
frequency
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
GB1210942A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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
Priority to FR957839D priority Critical patent/FR957839A/fr
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1210942A priority patent/GB581173A/en
Publication of GB581173A publication Critical patent/GB581173A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/36—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy
    • H01J23/40—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit
    • H01J23/48—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit for linking interaction circuit with coaxial lines; Devices of the coupled helices type

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

581,173. Resonator circuits. STANDARD TELEPHONES & CABLES, Ltd., and WILLOUGHBY, E. O. Aug. 27, 1942, No. 12109. [Classes 39 (i), 40 (iii), and 40 (v)] Two coil-less resonators resonant at the same frequency are coupled together inductively at current anti-nodal points and are designed so that the equivalent series impedances at the coupling point have the same ratio of reactance to resistance so as to give a band-pass effect. In one of the applications described, Fig. 2, one of the resonators 1, 2 forms part of a velocity modulation tube of the kind described in Specification 537,490 for generating oscillations having wave lengths less than 20 cms. and the other 8, 9 terminates in a conical autenna, each being of constant characteristic impedance and a quarter wave-length long, the coupling being by means of radial portions 23, 34 as shown in Fig. 3. With this arrangement, which presents a constant impedance over the pass-band to the energy-extracting gap of the tube, the generated frequency can be varied simply by varying the accelerating voltage without modifying the dimensions of the resonator and the device can thus be used in an altimeter system of the reflection type operating on the known frequency-sweep principle. The invention may also be employed on the receiving circuit of such a system. In one such arrangement, Fig. 5 (not shown), a conical aerial is coupled to a length of coaxial line having a piezo-electric crystal connected at a current antinode. Where a straight aerial is used, the line coupled to it is stepped as shown in Fig. 6 and dimensioned in accordance with Z Z1 the relation -=- where these terms are the Z<1> Z1<SP>1> characteristic impedances of the portions indicated on the drawing.
GB1210942A 1942-08-27 1942-08-27 Improvements in band pass filters for ultra-high frequencies Expired GB581173A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR957839D FR957839A (en) 1942-08-27
GB1210942A GB581173A (en) 1942-08-27 1942-08-27 Improvements in band pass filters for ultra-high frequencies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1210942A GB581173A (en) 1942-08-27 1942-08-27 Improvements in band pass filters for ultra-high frequencies

Publications (1)

Publication Number Publication Date
GB581173A true GB581173A (en) 1946-10-03

Family

ID=9998545

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1210942A Expired GB581173A (en) 1942-08-27 1942-08-27 Improvements in band pass filters for ultra-high frequencies

Country Status (2)

Country Link
FR (1) FR957839A (en)
GB (1) GB581173A (en)

Also Published As

Publication number Publication date
FR957839A (en) 1950-02-25

Similar Documents

Publication Publication Date Title
US2593120A (en) Wave guide transmission system
GB1348904A (en) Oscillator circuits using a plurality of negative resistance devices
GB675625A (en) Improvements in or relating to ultra short wave oscillators
GB612957A (en) Wave-signal selector
US2671883A (en) Wave guide impedance transformer
US2679585A (en) Frequency discriminator
GB561910A (en) Improvements in electron discharge devices, particularly for ultra high frequencies
US2468166A (en) Mixing apparatus
GB581173A (en) Improvements in band pass filters for ultra-high frequencies
US3197720A (en) Transmission line having frequency reject band
GB644202A (en) High frequency electric discharge apparatus
US2519795A (en) High-frequency electrical breakdown apparatus
GB592398A (en) Improvements in or relating to impedance transforming devices
GB644853A (en) High frequency electrical apparatus
GB605253A (en) Improvements in and relating to concentric-conductor transmission lines
US2712605A (en) Oscillation generator
US2266501A (en) Electrical wave filter
US2476803A (en) High stability receiver circuit
US2624844A (en) Broad band antenna
US2710346A (en) Heterodyne mixer stage
GB598640A (en) Improvements relating to valve oscillating or amplifying circuits
GB664688A (en) Arrangements for separating or combining the different frequency components of energy waves
US2406635A (en) Method for amplifying highfrequency signals
GB586122A (en) Improvements in tunable electric resonators for ultra high frequencies
US2531683A (en) Stabilized line tuned oscillator