GB883439A - Improvements in or relating to electromagnetic wave transmission systems - Google Patents

Improvements in or relating to electromagnetic wave transmission systems

Info

Publication number
GB883439A
GB883439A GB27341/58A GB2734158A GB883439A GB 883439 A GB883439 A GB 883439A GB 27341/58 A GB27341/58 A GB 27341/58A GB 2734158 A GB2734158 A GB 2734158A GB 883439 A GB883439 A GB 883439A
Authority
GB
United Kingdom
Prior art keywords
helix
diameter
jacket
circular
conductor
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
GB27341/58A
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB883439A publication Critical patent/GB883439A/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
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H01P1/163—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion specifically adapted for selection or promotion of the TE01 circular-electric mode
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/52—Systems for transmission between fixed stations via waveguides

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Waveguides (AREA)

Abstract

883,439. Waveguides. WESTERN ELECTRIC CO. Inc. Aug. 26, 1958 [Sept. 16, 1957], No. 27341/58. Class 40(8). A system for transmitting the TE 01 circular electric mode has means for coupling the mode from a first section 31 of circular waveguide to a second section 32 of circular waveguide having a smaller diameter with minimum mode conversion and filtering of spurious non-circular modes, comprising a conical tapered section formed by winding an elongated conductor 24 into a helix with adjacent turns 25, 26 spaced apart, and a jacket 28 of electrically dissipative material surrounding the helix. The turns 25, 26 are spaced apart either by an air gap 27 or by insulation surrounding the conductor 24 before it is wound. The pitch distance of the helix is less than one-quarter wavelength and is preferably such that the gap 27 between the turns is less than the diameter of the conductor 24. The helix can be a single or stranded wire of spring steel or iron plated with a highly conductive material such as copper or silver. The jacket 28 comprises a conical frustrum having its inside surface contiguous with the outermost part of the helix. The dissipative material of the jacket 28 can comprise small particles of resistive material such as iron dust or carbon black suspended in a dielectric material such as polyethylene. The jacket 28 is covered with a non-corrosive conducting shield 30 which may be of wound overlapping thin strips or of woven braid. The waveguide sections 17, 21 having the larger diameter are of long length and the waveguide sections 15, 19, 23 of smaller diameter are of short length incorporating bends and are connected to transducers 13, 14 between a repeater or transmitting station 11 and a repeater or receiving station 12. The diameter of the guide 32 can be from 1.25 to 10 times the cut-off diameter which is 1.22 # 0 where # 0 is the wavelength in free space of the longest wave in the transmission band. The effects of placing a TM filter in various parts of the transmission system is discussed. Specification 764,737 is referred to.
GB27341/58A 1957-09-16 1958-08-26 Improvements in or relating to electromagnetic wave transmission systems Expired GB883439A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US883439XA 1957-09-16 1957-09-16

Publications (1)

Publication Number Publication Date
GB883439A true GB883439A (en) 1961-11-29

Family

ID=22210823

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27341/58A Expired GB883439A (en) 1957-09-16 1958-08-26 Improvements in or relating to electromagnetic wave transmission systems

Country Status (1)

Country Link
GB (1) GB883439A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146414A (en) * 1962-06-26 1964-08-25 Bell Telephone Labor Inc Tapered waveguide transition section with dielectric sleeve positioned to reduce coupling between te circular modes
US3176249A (en) * 1959-11-30 1965-03-30 Marconi Co Ltd Waveguide impedance matching transitions while maintaining effective cross-section unchanged

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176249A (en) * 1959-11-30 1965-03-30 Marconi Co Ltd Waveguide impedance matching transitions while maintaining effective cross-section unchanged
US3146414A (en) * 1962-06-26 1964-08-25 Bell Telephone Labor Inc Tapered waveguide transition section with dielectric sleeve positioned to reduce coupling between te circular modes

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