US2028510A - Transmitter for electromagnetic waves - Google Patents

Transmitter for electromagnetic waves Download PDF

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Publication number
US2028510A
US2028510A US638907A US63890732A US2028510A US 2028510 A US2028510 A US 2028510A US 638907 A US638907 A US 638907A US 63890732 A US63890732 A US 63890732A US 2028510 A US2028510 A US 2028510A
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US
United States
Prior art keywords
antenna
reflecting
main antenna
effective
ineffective
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
US638907A
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English (en)
Inventor
Kramar Ernst
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 US2028510A publication Critical patent/US2028510A/en
Priority claimed from DEL90023D external-priority patent/DE659836C/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

  • the invention is concerned with-devices for direction flndingmethods of this type; It employs, instead of directional antenna systems wh'ch'are alternately keyed, antenna arrangements, in which reflectors or only one thereof and an exciter antenna are provided. This exciter antenna is fed continuously from the high ,irequency generator, and the reflector or re- 2 flectors are keyed.
  • Figure 1 is a schematic elevation of an example of the device.
  • FIG. 1a shows schematically an arrangement for differently modulating thefradiated high frequency in each direction.
  • Figures 2, 3 and 4 are.
  • n-dipoleE is continuously energized by the transmitter B.
  • dipoles Ri' and R2 which act as .reflectors; Thesereflectors are interruptedin the middle and may beclosed by relaysMl and M2. Insteadoi' interrupting the reflectors, it is possible to provide for them tobe detuned, for. example.
  • the re- I a lays MI and M2 are alternately energized and de-energizedby a'commutator K, whichis driven by a motor A.
  • the dipole BI is opened,'that is inactive, and the g dipole m closed,t hat isaictive.
  • a relay device may be employed. which is so'arranged that both relays. are keyed in parallel. and thereby the contacts of the one closed and those of the other, opened. s
  • FIG. 2 shows the radiationconditions, Ii. v both reflectors'Ri and R2 are opened, the horizontal' characteristic otthe energizer dipcle'E is a circle a:--- rr only the reflector RI isclosed, then the characteristic 1: is obtained. It only the re- .55 flector Rl is closed, the characteristic c is obtained. If both reflectors are closed, then the f characteristic d is obtained. In the normal operation for radio-beacon purposes the characteristic d can be dispensed with. For certain purposes, however, characteristics of this type are 5 desirable.
  • a single reflector is quite suiflcient for a simple device.
  • the length of the reflector R is smaller than M2.
  • the characteristic 2' applies for M2, that is for a reflector which is the same length as the energizer, and characteristic k for an arrangement in which. the reflector is longer than the energizer :and especially with ultra-short waves.
  • the presstance aoaaaio ent invention avoids keying the high frequency radiation from said main antenna, and means for current since only the reflector or reflectors are influenced.
  • the circuits of the relays MI and M2 carry only direct current er. low frequency alternating current and can be easily protected against high frequency, for example by choke arrangements.
  • the conductors to the relays may also consist of resistance wire, in order to prevent the passage of high frequency currents.
  • The-invention may also be employed in arrangements in whichinstead of transmitting signals-according to the a-n-method or the like, the radiated high frequency ismodulated with different modulation frequencies, viz. at a particular frequency-in each direction.
  • Such a modulating arrange t is shown in lj'ig. 1 wherein the high frequency of the transmitter S is modulated at one frequency h in one direction and. ate-frequency f: in the other direction, a switch at being provided to operate in rhythm withcommutator K so as to connect the appropriate modulating frequency with transmitter S as the respective reflecting antenna: R1- and R2 are keyed.
  • the keying of the reflector may be eflectechby the means A, K, Ml, M2 shown in Figure 1, and a further collector or relay arrangement-provided V for controlling the alternate modulation of the transmitter at two modulation frequencies, or a two-frequency machine may be used which is provided with a cam disc arrangement for the actua tion of contacts controlling modulation frequencies.
  • a radio transmitting arrangement comprising a main antenna, a high frequency generator coupled thereto,. a reflecting antenna on either side of said main antenna and spaced in line therewith a half wavelength therefrom, and means for abruptly rendering said reflecting antennaa alternately effective and ineffective so that the supply of the one is ineffective whilst the other is efl'ective to reflect the radiation from said main antenna.
  • a radio transmittingarrangement compriscoupled thereto, a reflecting antenna on either side of said main antenna and spaced therefrom in line therewith, means for abruptly rendering said reflecting-antennae alternately eifective and ineffective so that one is ineffective whilst the other is effective to reflect the radiation from said main antenna, sources of modulating signals of two different frequencies, and means for modulatingthe high frequency from the main antenna in accordance with the signal of one of said modulatingfrequencies whilst one of said reflecting antenna is eil'ective, and by signal of the other of said modulating frequencies whilst the, other of 'said reflecting antenna: is effective.
  • a radiotransmittin'g arrangement comprisingga main antenna, a high frequency generator coupled thereto, a reflecting antenna on either side of said main antenna. and spaced therefrom in line therewith, means for abruptly rendering said'reflecting antenna alternately efl'ective and ineffective so that one is ineffective whilst the other is effective to reflect the radiation from said main antenna thereby to produce a zone of equal -fleld intensity, and means for modulating the high frequency by a signal whilst one of the reflecting antenna: is effective and by a complemental signal whilst the other reflecting antenna is effective so that said signals combine to form a continuous signal within the equal field intensity zone.
  • a radio transmitting arrangement comprising a main antenna. a high frequency generator coupled thereto, a reflecting antenna on either side of said main antenna and spaced therefrom in line therewith, means for abruptly rendering said reflecting antenna alternately'effective and ineffective so that one is ineffective whilst the other is effective to reflect the radiation from j said main antenna thereby to produce azone of equal fleld intensity, and means for modulating ing an energizer dipole having a length equal to a .1
  • a radio transmitting arrangement comprising an energizer dipole having a length equal to a half wavelength, a high frequency generator coupled thereto, two reflector dipoles of greater.
  • a radio transmitting arrangement comprising a main antenna, a high frequengy generator coupled ,thereto, a plurality ofreflec'tion antennae co-operating with saidmainantenna'when effective, .to reflect and thereby make-directive the 8.
  • a radio transmitting'arrangement compris- "ing a main antenna, a high frequency generator coupled thereto,-a reflecting antenna on either .side of said main antenna and spaced therefrom.
  • Aradio transmitting arnangement comprising, a main antenna, a high frequency generator coupled thereto. a reflecting antenna on either side of said main antenna.
  • a radio transmitting arrangement comprising, an energizer dipole having a length equal to spect to said energizer dipole that there is produced a zone common to the reflected radiations from the two reflector dipoles, and means for abruptly rendering said reflector dipoles alternately effective and ineflective each being ineffective while the other is effective thereby to produce in said zone a fleld of equal intensity.
  • a radio transmitting arrangement comprising, a main antenna, a high frequency generator coupled thereto, a reflecting antenna on either side of said main antenna and so disposed with respect thereto as to produce a zone common to the radiations reflected from said reflecting an-Q tenure, means for rendering said reflecting an-.
  • a radio transmitting arrangement comprising, a main antenna, a high frequency generator coupled thereto, a reflecting antenna on either ,side of said main antenna, means for rendering said reflecting antennae alternately eflective and inefiective so that one is ineflective whilst the other is eflective to reflect the radiation from said antenna, said reflecting antenna being spaced from the main antenna and in such relation thereto that a portionof the area of the rea flected radiation from one reflecting antenna also forms a portion of the area of'the reflected radiation from the other reflecting antenna whereby said alternate operation of said reflecting antenme produces a zone of equal fleld intensity in said common area.
  • a radio transmitting arrangement comprising, an energizer dipole having a length equal to a half wavelength, a high frequency generator coupled thereto; two reflector 'dipoles of greater length than said energizer dipoles and spaced therefrom on either side thereof and so disposed with respectto said energizer dipole that there isv produced a zone common to the reflected radiations from the two reflector dipoles, and means for abruptly rendering said'reflector dipoles alternately effective and ineffective each being ineflective while the other is effective thereby to produce in said zone a fleld of equal intensity.
  • a radio transmitting arrangement compris in a main antenna, a high frequency generator coupled thereto, a reflecting antenna on either thereby to produce in said zone a fleld of equal intensity. 4
  • a radio transmitting arrangement comprising a main antenna, a high frequency generator coupled thereto, a reflecting antenna at one side oi. said main antenna, continuously operable means for rendering said reflecting antenna alternately effective and ineffective, said reflecting antenna being in such relation to the main antenna that a'portion of the'area of the reflected radiation also forms a portion of the area of the in radiation from the main antenna whereby the alternate operation of said reflecting antenna ERNST KRAMAR.

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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)
  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)
  • Circuits Of Receivers In General (AREA)
  • Transmitters (AREA)
  • Toys (AREA)
US638907A 1932-04-20 1932-10-21 Transmitter for electromagnetic waves Expired - Lifetime US2028510A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DEL81003D DE577350C (de) 1932-04-20 1932-04-20 Sendeanordnung zur Erzielung von Kurslinien
DEL85653D DE616026C (de) 1932-04-20 1934-04-07 Sendeanordnung zur Erzielung von Kurslinien gemaess
DE2151922X 1934-10-05
DEL90023D DE659836C (de) 1934-04-07 1936-03-22 Sendeanordnung zur Erzielung von Kurslinien

Publications (1)

Publication Number Publication Date
US2028510A true US2028510A (en) 1936-01-21

Family

ID=34069174

Family Applications (3)

Application Number Title Priority Date Filing Date
US638907A Expired - Lifetime US2028510A (en) 1932-04-20 1932-10-21 Transmitter for electromagnetic waves
US14212A Expired - Lifetime US2072268A (en) 1932-04-20 1935-04-02 Transmitter for electromagnetic waves
US43486A Expired - Lifetime US2151922A (en) 1932-04-20 1935-10-04 Receiver for electromagnetic waves

Family Applications After (2)

Application Number Title Priority Date Filing Date
US14212A Expired - Lifetime US2072268A (en) 1932-04-20 1935-04-02 Transmitter for electromagnetic waves
US43486A Expired - Lifetime US2151922A (en) 1932-04-20 1935-10-04 Receiver for electromagnetic waves

Country Status (6)

Country Link
US (3) US2028510A (xx)
BE (1) BE414649A (xx)
DE (2) DE577350C (xx)
FR (7) FR44877E (xx)
GB (5) GB405727A (xx)
NL (3) NL38464C (xx)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2229733A (en) * 1938-05-13 1941-01-28 Internat Telephone Dev Co Inc Antenna structure
DE761950C (de) * 1941-05-10 1954-01-18 Lorenz C Ag Verfahren zur Kursweisung mittels frequenzmodulierter Strahlungen
US2439663A (en) * 1942-02-26 1948-04-13 Hazeltine Research Inc System for navigating aircraft
US2492354A (en) * 1945-04-09 1949-12-27 Standard Telephones Cables Ltd Dipole antenna direction finder
US2831189A (en) * 1945-06-23 1958-04-15 Robert J Kemper Wide band homing system

Also Published As

Publication number Publication date
FR45994E (fr) 1936-01-17
GB405727A (en) 1934-02-15
FR47701E (fr) 1937-06-22
US2072268A (en) 1937-03-02
FR44877E (fr) 1935-04-24
GB442193A (en) 1936-02-04
GB438804A (en) 1935-11-25
DE577350C (de) 1933-05-30
FR795983A (fr) 1936-03-26
NL38464C (xx)
GB444005A (en) 1936-03-11
DE616026C (de) 1935-07-18
GB472941A (en) 1937-10-04
FR44879E (fr) 1935-04-24
NL41765C (xx)
BE414649A (xx)
FR741872A (xx) 1933-02-22
NL46080C (xx)
US2151922A (en) 1939-03-28
FR47380E (fr) 1937-03-25

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