US1868795A - Antenna - Google Patents

Antenna Download PDF

Info

Publication number
US1868795A
US1868795A US161769A US16176927A US1868795A US 1868795 A US1868795 A US 1868795A US 161769 A US161769 A US 161769A US 16176927 A US16176927 A US 16176927A US 1868795 A US1868795 A US 1868795A
Authority
US
United States
Prior art keywords
lead
wires
antenna
wave
line
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
US161769A
Other languages
English (en)
Inventor
Clarence W Hansell
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.)
RCA Corp
Original Assignee
RCA Corp
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 NL23498D priority Critical patent/NL23498C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US161769A priority patent/US1868795A/en
Priority to DER72635D priority patent/DE491416C/de
Application granted granted Critical
Publication of US1868795A publication Critical patent/US1868795A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • This invention relates to antenna arrangements, and more particularly to short wave antennae lead-in wires, and a method and means for coupling them to the antenna.
  • Another disadvantage of an ordinary lead in system is its tendency to. radiate energy which may be "differently directed and out of phase with that radiated by the antenna It is an object of my invention to overcome these difiiculties, and to providea lead-in which will obviate the possibility of standing waves and high losses, and which will not effect appreciable radiation.
  • Fig. 1 is a wiring diagram of an arrangement according to my invention
  • Fig. 2 is a schematic layout, inperspective', of an embodimentot my invention
  • Fig. 3 shows an antenna of harmonic length.
  • transm ssion line which may be'demonstrated' mathematia cally I shall more simply illustrate by reference to asupposititious transmission line extending to infinity.
  • Such a transmission line of infinite length wouldobviously be characterized by a total absence of reflections and standing waves, for the reason that the impressed'energy wouldnever reach the end of the line to be reflected, and standing waves usually are caused by a reflected wave com.
  • the. short wave antenna is represented by the numeral 2
  • the. short wave antenna is represented by the numeral 2
  • the points A and B are coupled to the output inductance 8 ofthe transmitter 10. According to my invention the points A and B are so spaced that the impedance therebetween is equal to the characteristic impedance of the conductors 4:, considered as a transmission line.
  • One simple procedure for determining when the proper location of the points A and B has been obtained utilizes a plurality of ammeters inserted along the lead-in wires, which are made to read alike. To avoid the possibility of locating the ammeters symmetrically with respect to a standing wave, at least three ammeters should be used, and these should be spaced unequally. In Fig. l the ammeters are 22, 24, and 26, and the space between 22 and 24: is different from that between 24 and 26.
  • the antenna is the conductor 2, and it is supported upon the masts l2 and insulated therefrom by the insulators 14;.
  • the conductors l as before, are coupled to the antenna at the properly spaced points A and B, and these conductors are guided to the building- 16, in which the transmitter is housed.
  • the point of bend of the transmission line l may be supported by a wire 18 and insulators 20.
  • the antenna need not necessarily be one half a wave in length. It is desirable that the coupling points be symmetrically located with respect to a potential node and a current antinode.
  • Fig. 3 a linear oscillator one and one half waves in length is illustrated. In both Fig. 1 and Fig. 3 the solid curve indicates potential, while the dotted curve indicates current.
  • the lead-in wires do not elfect appreciable radiation because they tend to neutralize one another, and also because they extend in the direction of their wave propagation, instead of transversely thereof.
  • the antenna be horizontal, oblique, or vertical, but it is well in the case of a vertical or oblique antenna to increase the elevation in order that the capacitance from each half of the antenna to ground may not be appreciably unbalanced.
  • means to radiate high frequency energy including a simple linear oscillator, and a plurality of lead-in wires directly coupled thereto at points so spaced that the external impedance across which the lead-in wires are connected is equal to the characteristic impedance of the lead-in wires.
  • An antenna arrangement for the radiation of very short waves comprising a simple linear oscillator an odd number of half wave lengths long, and lead-in wires directly symmetrically coupled thereto at points so spaced that the impedance therebetween equals the characteristic impedance of the lead-in wires.
  • An arrangement for the radiation of short waves comprising a transmitter having an output circuit, a short wave antenna,
  • An antenna arrangement for the radiation of very short waves comprising a straight wire oscillator an odd number of half wave lengths long, and lead-in wires directly symmetrically coupled thereto at points so spaced that the impedance of the portion of straight wire of the oscillator therebetween equals the characteristic impedance of the lead-111 wires.
  • the method of adjusting the coupling of a transmission line to an antenna so that there will be no reflection of energy from the antenna end of the line back into the line which includes varying the coupling at the antenna end of the line until a plurality of indicating devices, responsive to high frequency currents, placed in the line, and spaced other than a half wave length or a whole multiple thereof apart, read alike.
  • the method of coupling the lead-in Wires to the antenna which includes placing a plurality of indicating devices, responsive to high frequency currents, in the lead-in wires unequal distances apart the distances taken being other than one-l1alf wave length or a whole multiple thereof, and varyin the coupling of the lead-in wires with the antenna until the indicating devices, responsive to high frequency currents, read alike.
  • the method of locating the antenna coupling points for the leadin wires which includes placing a plurality of indicating devices, responsive to high frequency currents, in the lead-in wires unequal distances apart, the distances taken being other than onehalf wave length or a Whole multiple thereof, and varying the coupling points on the antenna until the indicating devices read alike.
  • means to radiate high 4 frequency energy including a simple linear oscillator substantially one-halfwave length long, and a plurality of lead-in wires directly coupled thereto at points so spaced that the external impedance across which'the lead-in wires are connected is equal to the characteristic impedance of the lead-in wires.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
US161769A 1927-01-18 1927-01-18 Antenna Expired - Lifetime US1868795A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL23498D NL23498C (de) 1927-01-18
US161769A US1868795A (en) 1927-01-18 1927-01-18 Antenna
DER72635D DE491416C (de) 1927-01-18 1927-10-27 Antennenanordnung fuer kurze Wellen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US161769A US1868795A (en) 1927-01-18 1927-01-18 Antenna

Publications (1)

Publication Number Publication Date
US1868795A true US1868795A (en) 1932-07-26

Family

ID=22582644

Family Applications (1)

Application Number Title Priority Date Filing Date
US161769A Expired - Lifetime US1868795A (en) 1927-01-18 1927-01-18 Antenna

Country Status (3)

Country Link
US (1) US1868795A (de)
DE (1) DE491416C (de)
NL (1) NL23498C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2942259A (en) * 1956-10-03 1960-06-21 Channel Master Corp Broad band television antenna
US3412403A (en) * 1964-12-22 1968-11-19 Carl I. Peters Jr. Radiating tuned inductance coil antenna

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2942259A (en) * 1956-10-03 1960-06-21 Channel Master Corp Broad band television antenna
US3412403A (en) * 1964-12-22 1968-11-19 Carl I. Peters Jr. Radiating tuned inductance coil antenna

Also Published As

Publication number Publication date
NL23498C (de)
DE491416C (de) 1930-02-10

Similar Documents

Publication Publication Date Title
US3742509A (en) Subsurface traveling wave antenna
US2283897A (en) Antenna system
US2086976A (en) Antenna system
US1821386A (en) Antenna
US2292496A (en) Transmission line circuit
Sterba et al. Transmission lines for short-wave radio systems
US2127088A (en) Feeder and the like for electric currents of high frequency
US2313513A (en) Antenna
US1868795A (en) Antenna
US2153768A (en) Antenna system
US1901025A (en) Aerial
US1778395A (en) Coupling device
US1831921A (en) Short wave radio antenna system
US2327485A (en) Broad band antenna
US1998960A (en) High frequency transmission system
US2238904A (en) Short wave communication system
US2259510A (en) Coupling arrangement for high frequency transmission systems
US2209813A (en) Antenna system
US1963723A (en) Impedance transformer
US2258407A (en) Wide band antenna
US2692335A (en) Balanced coupling unit for highfrequency transmission
US1959407A (en) Transmission system
US2379260A (en) Antenna system
US1740371A (en) Directive radio transmitting system
US2147808A (en) Antenna