GB834465A - Improvements in or relating to microwave modulators - Google Patents

Improvements in or relating to microwave modulators

Info

Publication number
GB834465A
GB834465A GB8775/57A GB877557A GB834465A GB 834465 A GB834465 A GB 834465A GB 8775/57 A GB8775/57 A GB 8775/57A GB 877557 A GB877557 A GB 877557A GB 834465 A GB834465 A GB 834465A
Authority
GB
United Kingdom
Prior art keywords
block
guide
secured
waveguide
march
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
GB8775/57A
Inventor
Alan Frank Gibson
James William Granville
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB8775/57A priority Critical patent/GB834465A/en
Priority to US720680A priority patent/US2977551A/en
Priority to DEN14777A priority patent/DE1060925B/en
Priority to FR1193363D priority patent/FR1193363A/en
Publication of GB834465A publication Critical patent/GB834465A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C7/00—Modulating electromagnetic waves
    • H03C7/02—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas
    • H03C7/025—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas using semiconductor devices

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Non-Reversible Transmitting Devices (AREA)
  • Microwave Amplifiers (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

834,465. Waveguide accessories. NATIONAL RESEARCH DEVELOPMENT CORPORATION. March 11, 1958 [March 18, 1957], No. 8775/57. Class 40 (8). [Also in Group XL (c)] A microwave modulator comprises a waveguide with reduced section 2 and a semiconductor block 3 extending from conductive contact with one wall of the guide to occupy a slot 7 in the opposite wall without conductive contact with the opposite wall and a modulating source 11 applying a signal voltage across the semi-conductor, parallel with the E vector in the guide, to vary its absorption of the electric field, the absorption decreasing as the modulating voltage increases. The semi-conductor block 3 may be secured to the slot edges by mica and the modulation lead 9 secured to a non-injecting N+ region of enhanced conductivity formed on the block. Bulkheads containing liquid dielectric such as silicone oil or carbon tetrachloride may surround the block to cool it, or the liquid may be circulated through a cooling' radiator, or cooling fins secured to the guide adjacent the block. Adjustable stubs in the guide may be provided before and after the block to prevent reflection from the block. Choke-structures may be associated with the slot edges to prevent radiation. The modulation may be a short pulse, the modulator having short time response and wideband characteristics.
GB8775/57A 1957-03-18 1957-03-18 Improvements in or relating to microwave modulators Expired GB834465A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB8775/57A GB834465A (en) 1957-03-18 1957-03-18 Improvements in or relating to microwave modulators
US720680A US2977551A (en) 1957-03-18 1958-03-11 Microwave modulator
DEN14777A DE1060925B (en) 1957-03-18 1958-03-11 Microwave modulator
FR1193363D FR1193363A (en) 1957-03-18 1958-03-17 Microwave modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8775/57A GB834465A (en) 1957-03-18 1957-03-18 Improvements in or relating to microwave modulators

Publications (1)

Publication Number Publication Date
GB834465A true GB834465A (en) 1960-05-11

Family

ID=9859033

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8775/57A Expired GB834465A (en) 1957-03-18 1957-03-18 Improvements in or relating to microwave modulators

Country Status (4)

Country Link
US (1) US2977551A (en)
DE (1) DE1060925B (en)
FR (1) FR1193363A (en)
GB (1) GB834465A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5824202A (en) * 1981-08-04 1983-02-14 Fujitsu Ltd Microwave variable attenuator

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3096494A (en) * 1960-12-30 1963-07-02 Jacobs Harold Microwave amplitude modulator
CA978911A (en) * 1972-01-19 1975-12-02 The Gillette Company Apparatus for controlling discharge of material from a pressurized dispensing package
JPH0250604A (en) * 1988-08-12 1990-02-20 Michiko Naito Active antenna
US6433835B1 (en) 1998-04-17 2002-08-13 Encamera Sciences Corporation Expanded information capacity for existing communication transmission systems
US20030140351A1 (en) * 1998-04-17 2003-07-24 Hoarty W. Leo Cable television system compatible bandwidth upgrade using embedded digital channels
US20030112370A1 (en) * 2001-12-18 2003-06-19 Chris Long Adaptive expanded information capacity for communications systems
US20030219085A1 (en) * 2001-12-18 2003-11-27 Endres Thomas J. Self-initializing decision feedback equalizer with automatic gain control
US7180942B2 (en) 2001-12-18 2007-02-20 Dotcast, Inc. Joint adaptive optimization of soft decision device and feedback equalizer
US6917336B2 (en) * 2002-01-23 2005-07-12 Dotcast, Inc. Miniature ultra-wideband active receiving antenna
WO2004075469A2 (en) * 2003-02-19 2004-09-02 Dotcast Inc. Joint, adaptive control of equalization, synchronization, and gain in a digital communications receiver

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE469698A (en) * 1945-03-10
US2646550A (en) * 1948-01-09 1953-07-21 Arthur A Varela Controlled impedance gas discharge device for mechanical transmission mediums
DE879845C (en) * 1948-07-29 1953-04-30 Csf Vibration generator using a traveling wave tube
US2820952A (en) * 1953-12-29 1958-01-21 Collins Radio Co High power ladder network attenuator for frequencies from zero to over one thousand megacycles
US2760013A (en) * 1955-04-26 1956-08-21 Rca Corp Semiconductor velocity modulation amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5824202A (en) * 1981-08-04 1983-02-14 Fujitsu Ltd Microwave variable attenuator

Also Published As

Publication number Publication date
FR1193363A (en) 1959-11-02
DE1060925B (en) 1959-07-09
US2977551A (en) 1961-03-28

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