US2238268A - Reflecting antenna for radio beacons - Google Patents

Reflecting antenna for radio beacons Download PDF

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Publication number
US2238268A
US2238268A US311081A US31108139A US2238268A US 2238268 A US2238268 A US 2238268A US 311081 A US311081 A US 311081A US 31108139 A US31108139 A US 31108139A US 2238268 A US2238268 A US 2238268A
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US
United States
Prior art keywords
dipole
radio beacons
reflecting antenna
resistance
circuit
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
US311081A
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English (en)
Inventor
Kautter Wolfgang
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
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 Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US2238268A publication Critical patent/US2238268A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • 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

Definitions

  • a: is more or less small with respect to number one. With such small capacity variations it will sometimes be difiicult to produce strong effects on the reflecting antennae or dipoles.
  • Fig. 1 is a diagrammatic representation showing an embodiment of the invention
  • Fig. 2 is a so-called. substitute or equivalent diagram that serves to explain the principle on which the invention is based.
  • Fig. 1 parallel as well as series resonance of an oscillatory circuit arranged between conductors constituting a dipole D are used.
  • the operative means of this circuit are so calculated that the rotary condenser AC when in the position where its capacity is Co just produces series resonance with coil L of the oscillatory circuit, dipole D thus being perfectly free to oscillate.
  • the rotary condenser When the rotary condenser is in the position where its capacity is CO+AC it acts to render the inductive branch L/Z, L/2 so intensely inductive that this branch will cooperate in parallel resonance with condenser Cp of the oscillatory circuit, so as to constitute a high ohmic resistance interposed between the terminals 11, a of the dipole conductors.
  • a modulating device for varying the reradiation effect of a radiation energized reflector dipole comprising an oscillatory circuit connected between the dipole parts, and a variable condenser coupled to said circuit to tune said circuit alternately to parallel resonance and to series resonance at the operating frequency dependent upon the adjustment of said condenser.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Radiation-Therapy Devices (AREA)
  • Electrotherapy Devices (AREA)
US311081A 1939-01-07 1939-12-27 Reflecting antenna for radio beacons Expired - Lifetime US2238268A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE212454X 1939-01-07

Publications (1)

Publication Number Publication Date
US2238268A true US2238268A (en) 1941-04-15

Family

ID=5808190

Family Applications (1)

Application Number Title Priority Date Filing Date
US311081A Expired - Lifetime US2238268A (en) 1939-01-07 1939-12-27 Reflecting antenna for radio beacons

Country Status (3)

Country Link
US (1) US2238268A (en(2012))
BE (1) BE437348A (en(2012))
CH (1) CH212454A (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172106A (en) * 1960-12-22 1965-03-02 Gen Precision Inc Semi-passive beacon

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172106A (en) * 1960-12-22 1965-03-02 Gen Precision Inc Semi-passive beacon

Also Published As

Publication number Publication date
CH212454A (de) 1940-11-30
BE437348A (en(2012))

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