US2232043A - Radio communication system - Google Patents

Radio communication system Download PDF

Info

Publication number
US2232043A
US2232043A US298905A US29890539A US2232043A US 2232043 A US2232043 A US 2232043A US 298905 A US298905 A US 298905A US 29890539 A US29890539 A US 29890539A US 2232043 A US2232043 A US 2232043A
Authority
US
United States
Prior art keywords
propeller
aircraft
antenna
radio communication
communication system
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
US298905A
Other languages
English (en)
Inventor
Alford Andrew
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.)
INTERNAT TELEPHONE DEV CO Inc
INTERNATIONAL TELEPHONE DEVELOPMENT Co Inc
Original Assignee
INTERNAT TELEPHONE DEV 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
Priority to BE440631D priority Critical patent/BE440631A/xx
Application filed by INTERNAT TELEPHONE DEV CO Inc filed Critical INTERNAT TELEPHONE DEV CO Inc
Priority to US298905A priority patent/US2232043A/en
Priority to FR867828D priority patent/FR867828A/fr
Application granted granted Critical
Publication of US2232043A publication Critical patent/US2232043A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference

Definitions

  • This invention relates to radio communication systems and more specific-ally to a system for varying the modulation effect on aircraft radio receivers or transmitter, produced by the propellers of said aircraft.
  • An object of the invention is to detune the aircraft propeller and thereby vary the distortion of the field pattern in the vicinity of said propeller.
  • antennas and/ or conductors cause a distortion in a radiant action pattern in their immediate vicinity, the amount of distortion depending on the tuning of the conductor with respect to the frequency of the radiation as well as on the orientation of the conductor with respect to the radiation. This effect is especially noticeable and undesirable in the operation of antennas on aircraft provided with metal propellers.
  • the rotating propeller changes the radiation field pattern surrounding it at a regular rate, said change modulating the signal represented by said radiation.
  • the propeller may be of such a length to vicinity of said propeller so that any change in the tuning of the electrical means also changes the effect of the propeller upon the radiant action pattern.
  • Fig. 1 illustrates in side elevation a propeller detuning means according to the invention
  • Fig. 2 illustrates in side elevation an electromagnetic detuning means according to the invention
  • Fig. 3 illustrates in side elevation an electrostatic detuning means according to the invention.
  • Fig. 1 illustrates a propeller l which interferes with the field pattern of antenna system 2 of airplane 6 when it is substantially parallel to the direction of effective polarization of said antenna.
  • a tunable dipole antenna means 3 is located parallel to such direction of effective polarization of antenna system 2 and in the vicinity of propeller l and is used to change the effective tuning of said propeller so that the effect of said propeller upon the field pattern is varied.
  • Fig. 2 similarly illustrates propeller l, antenna system 2, and a tunable electrical means 5 electromagnetically coupled to said propeller.
  • Fig. 3 similarly illustrates propeller I, antenna system 2, and a tunable electrical means 5 electrostatioally coupled to said propeller.
  • tunable electrical means may be used to provide for changing the effect of the propeller as the propeller assumes Various positions about its axis, or a single means may be provided that may be rotated about an axis.
  • a radio communication system comprising an aircraft having a rotatable metal propeller of such a length as to substantially resonate at the communication frequency, an antenna mounted on said aircraft and positioned with respect to said propeller so that a distorting effect is produced on the radiant action pattern of said antenna in certain positions of said propeller, and electrical means mounted on said aircraft for detuning said propeller to modify said distorting effect in at least one of said certain positions.
  • a radio communication system comprising an aircraft having a rotatable met-a1 propeller substantially resonant at the communication frequency, an antenna mounted on said aircraft and positioned with respect to said propeller so that a distorting effect is produced on the radiant action pattern of said antenna in certain positions of said propeller, andelectrical means rotatably adjustable about an axis mounted on said aircraft for detuning said propeller to modify said distorting effect in any of said certain positions.
  • a radio communication system comprising an aircraft having a rotatable metal propeller substantially resonant at the communication frequency, an antenna mounted on said aircraft and positioned with respect to said propeller so that a distorting effect is produced on the radiant action pattern of said antenna in certain positions of said propeller, and tunable electrical means for detuning said propeller mounted on said aircraft for modifying said distorting effect in at least one of said certain positions.
  • a radio communication system comprising an aircraft having a rotatable metal propeller substantially resonant at the communication frequency, an antenna mounted on said aircraft and positioned with respect to said propeller so that a distorting effect is produced on the radiant action pattern of said antenna in certain positions of said propeller, and electrical means electrostatically coupled to said propeller and mounted on said aircraft for modifying said distorting effect in at least one of said certain positions.
  • a radio communication system comprising an aircraft having a rotatable metal propeller substantially resonant at the communication frequency, an antenna mounted on said aircraft mounted on said aircraft for modifying said distorting effect in at least one of said certain positions.
  • a radio communication system comprising 35: an aircraft having a rotatable metal propeller substantially resonant at the communication frequency, an antenna mounted on said aircraft and positioned with respect to said propeller so that a distorting effect is produced on the radiant action pattern of said antenna in certain positions of said propeller, and electrical means substantially parallel to the direction of polarization of said radiant action for detuning said propeller mounted on said aircraft for modifying said distorting effect.
  • a radio communication system comprising an aircraft having a rotatable metal propeller substantially resonant at the communication frequency, an antenna mounted on said aircraft and positioned with respect to said propeller so that a distorting effect is produced on the radiant action pattern of said antenna in certain positions of said propeller, and dipole antenna means substantially parallel to the direction of polarization of said radiant action mounted on said aircraft for modifying said distorting effect.
  • a radio communication system comprising an aircraft having a rotatable metal propeller substantially resonant at the communication frequency, an antenna mounted on said aircraft and positioned with respect to said propeller so that a distorting effect is produced on the radiant action p-attem of said antenna in certain positions of said propeller, and tunable dipole antenna means substantially parallel to the direction of polarization of said radiant action mounted on said aircraft for modifying said distorting effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
US298905A 1939-10-11 1939-10-11 Radio communication system Expired - Lifetime US2232043A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE440631D BE440631A (xx) 1939-10-11
US298905A US2232043A (en) 1939-10-11 1939-10-11 Radio communication system
FR867828D FR867828A (fr) 1939-10-11 1940-11-28 Systèmes de communications radioélectriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US298905A US2232043A (en) 1939-10-11 1939-10-11 Radio communication system

Publications (1)

Publication Number Publication Date
US2232043A true US2232043A (en) 1941-02-18

Family

ID=23152487

Family Applications (1)

Application Number Title Priority Date Filing Date
US298905A Expired - Lifetime US2232043A (en) 1939-10-11 1939-10-11 Radio communication system

Country Status (3)

Country Link
US (1) US2232043A (xx)
BE (1) BE440631A (xx)
FR (1) FR867828A (xx)

Also Published As

Publication number Publication date
FR867828A (fr) 1941-11-29
BE440631A (xx)

Similar Documents

Publication Publication Date Title
US2947987A (en) Antenna decoupling arrangement
US2507528A (en) Antenna
US2313046A (en) Radio antenna system
US2454766A (en) Broad band antenna
US1892221A (en) Polarization diversity reception
US3474452A (en) Omnidirectional circularly polarized antenna
US2426992A (en) Glide path transmitter
US2359620A (en) Short wave antenna
GB594654A (en) Antenna system for ultra-short waves
US2286428A (en) Arrangement for tuning parallel wire lines
US2495399A (en) Antenna system
US2611869A (en) Aerial system
US2972147A (en) Circularly polarized slot antenna
US2459768A (en) Apparatus for the radiation or reception of electromagnetic waves
US2600179A (en) Split cylinder antenna
US2644090A (en) Recessed slot antenna
US2232043A (en) Radio communication system
US2414376A (en) Wave guide
US2419577A (en) Antenna system
US2174353A (en) Transmission of waves with rotary polarization
US1855184A (en) Radio receiving system
US2440737A (en) Aircraft antenna
Sherman Circular loop antennas at ultra-high frequencies
US2518843A (en) Aircraft antenna
US3806944A (en) Vlf frequency diversity trailing wire transmitting antenna