US3456261A - Slotted waveguide aerial system - Google Patents

Slotted waveguide aerial system Download PDF

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Publication number
US3456261A
US3456261A US568162A US3456261DA US3456261A US 3456261 A US3456261 A US 3456261A US 568162 A US568162 A US 568162A US 3456261D A US3456261D A US 3456261DA US 3456261 A US3456261 A US 3456261A
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US
United States
Prior art keywords
phase
slots
guide
length
waveguide
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 - Lifetime
Application number
US568162A
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English (en)
Inventor
Mervyn James Crumpen
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co 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 Marconi Co Ltd filed Critical Marconi Co Ltd
Application granted granted Critical
Publication of US3456261A publication Critical patent/US3456261A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H01Q13/12—Longitudinally slotted cylinder antennas; Equivalent structures
    • H01Q13/14—Skeleton cylinder antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/004—Antennas or antenna systems providing at least two radiating patterns providing two or four symmetrical beams for Janus application

Definitions

  • a slotted waveguide aerial system includes a length of waveguide having a narrow wall ⁇ slotted with in-phase slots on one side of the middle of the length of guide and with anti-phase slots on the other side so that if the guide is fed at the centre point or co-phasially at its two ends the in-phase and anti-phase slots each have the same main direction of beam radiation.
  • This invention relates to aerial systems and more specically to aerial systems of the slotted waveguide type.
  • Aerial systems of this type are in wide use for directional radio transmission and reception, one very important use being in airborne Doppler navigation systems.
  • a slotted waveguide aerial system comprises a length of waveguide which is provided within-phase slotting on one side of an intermediate point in said length and with anti-phase slotting on the other side of said intermediate point, the slotting being such that if the guide is fed at said intermediate point or is fed cop'nasially at its two ends, the in-phase and antiphase slotting provide a common main direction.
  • a preferred embodiment comprises a length of rectangularly sectioned waveguide with one narrow wall slotted with in-phase slots on one side of the middle of said length and with anti-phase slots on the other side thereof.
  • the length of guide is provided with feeder means at said intermediate point and the outer ends of the guide length are reflectionlessly terminated eg. by suitably dimensioned terminating resistances or by short circuiting diodes as known per se.
  • means may be provided for feeding the outer ends of the guide length in phase and the guide may be loaded at the intermediate point by a suitable resistance or diode.
  • suitable waveguide switch mea-ns may be provided for changing over from centre feed to end feed and vice versa.
  • FIGURE l shows a commonly employed known aerial system with two slotted guides
  • FIGURE 2 shows an embodiment of this invention.
  • one waveguide 1 has in-phase slotting constituted by a plurality of parallel radiating slots 2 in one narrow wall thereof
  • the other waveguide 6 has anti-phase slotting constituted by two sets 7 and 8 each of parallel slots, those of set 7 alternating with and being oppositely inclined with respect to those of set 8 so that each slot in one set is a mirror image of an adjacent slot in the other.
  • the guides are side by side and are fed at opposite ends 3 in the case of guide 1 and 9 in the case of guide 6) in phase from a common source (not shown).
  • the other ends of the guides are terminated by matched loads 4.
  • the two waveguides, fed as described, will have a common direction of principal radiation, indicated by the arrows 5 and 11 which will remain substantially unchanged by any variation of frequency or temperature likely to be encountered in practice.
  • the installation involves two guides and to that extent is costly, bulk and heavy.
  • the embodiment of this invention has only a single guide 12.
  • This guide has one narrow wall slotted with in-phase slots 13 (the counterpart of the slots 2 of guide 1 of FIGURE 1) and anti-phase slots 14 (the counterpart of the slots 7 and 8 of guide 6 of FIG- URE 1).
  • the in-phase slots are on one side of the middle of the guide ⁇ 4 and the anti-phase slots are on the other side thereof.
  • a central feeder 15 is provided and the ends 16 and 17 of the guide are terminated by matching loads 4.
  • the parallel arrows 18 and 19 there is a common principal direction for radiation from the two sets 13, 14 of slots.
  • the guides could be fed in phase at their ends from a common source and terminated by a matching load at the centre.
  • a slotted waveguide aerial system comprising a length of waveguide which is provided on one side of an intermediate point in said length with a first plurality of slots which are arrayed along said length and are oriented in-phase with respect to one another, and is further provided on the other side of said intermediate point with a second plurality of slots which are arrayed along said length, some of said second plurality of slots being oriented irl-phase with respect to one another and are oriented anti-phase with respect to others of said second plurality of slots, the slotting being such that the in-phase and anti-phase slotting provides a common main direction when the guide is fed in one of the following ways, namely: (l) fed at said intermediate point, and (2) fed cophasially at its two ends.
  • An aerial system as claimed in claim 1 comprising a length of rectangularly sectioned waveguide with one narrow wall slotted with in-phase slots on one side of the middle of said length and with anti-phase slots on the other side thereof.
  • a slotted waveguide aerial system comprising a length of waveguide which is provided on one side of an intermediate point in said length with a first plurality of slots which are arrayed along said length and are oriented in-phase with respect to one another, and is further provided on the other side of said intermediate point with a second plurality of slots which are arrayed along said length, some of said second plurality of slots being oriented in-phase with respect to one another and are oriented anti-phase with respect to others of said second plurality of slots, the slotting being such that the in-phase and anti-phase slotting provides a common main direction when the guide is fed at said intermediate point.
  • a slotted waveguide aerial system comprising a length of waveguide which is provided on one side of an intermediate point in said length with a first plurality of slots which are arrayed along said length and are oriented irl-phase with respect to one another, and is further provided on the other side of said intermediate point with a second plurality of slots which are arrayed along said length, some of said second plurality of slots being oriented in-phase with respect to one another and are oriented anti-phase with respect to others of said second plurality of slots, the slotting being such that the in-phase and anti-phase slotting provides a common main direction when the guide is fed cophasially at its two ends.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Waveguide Aerials (AREA)
US568162A 1965-08-16 1966-07-27 Slotted waveguide aerial system Expired - Lifetime US3456261A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB34959/65A GB1142787A (en) 1965-08-16 1965-08-16 Improvements in or relating to aerial systems

Publications (1)

Publication Number Publication Date
US3456261A true US3456261A (en) 1969-07-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
US568162A Expired - Lifetime US3456261A (en) 1965-08-16 1966-07-27 Slotted waveguide aerial system

Country Status (4)

Country Link
US (1) US3456261A (de)
DE (1) DE1541481A1 (de)
GB (1) GB1142787A (de)
SE (1) SE349901B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4079361A (en) * 1974-01-23 1978-03-14 Microwave And Electronic Systems Limited Intrusion sensor and aerial therefor
US4191953A (en) * 1975-01-23 1980-03-04 Microwave and Electronic System Limited Intrusion sensor and aerial therefor
CN104051858A (zh) * 2014-05-31 2014-09-17 曹学磊 一种裂缝波导天线

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194681B (en) * 1986-08-29 1990-04-18 Decca Ltd Slotted waveguide antenna and array

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293645A (en) * 1964-07-09 1966-12-20 Elza R Farley Slotted cylindrical antenna

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293645A (en) * 1964-07-09 1966-12-20 Elza R Farley Slotted cylindrical antenna

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4079361A (en) * 1974-01-23 1978-03-14 Microwave And Electronic Systems Limited Intrusion sensor and aerial therefor
US4191953A (en) * 1975-01-23 1980-03-04 Microwave and Electronic System Limited Intrusion sensor and aerial therefor
CN104051858A (zh) * 2014-05-31 2014-09-17 曹学磊 一种裂缝波导天线

Also Published As

Publication number Publication date
DE1541481A1 (de) 1969-10-09
SE349901B (de) 1972-10-09
GB1142787A (en) 1969-02-12

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