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Publication numberUS2479209 A
Publication typeGrant
Publication dateAug 16, 1949
Filing dateJul 9, 1945
Priority dateJul 9, 1945
Publication numberUS 2479209 A, US 2479209A, US-A-2479209, US2479209 A, US2479209A
InventorsJen Chu Lan
Original AssigneeJen Chu Lan
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Antenna
US 2479209 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

L. J. CHU

ANTENNA Filed July 9, 1945 5555555500' Lf/ 70a @Jaaa 7 1 JJU M- wwf/MM cv/ INVENTOR LAN JEN. CHU

ATTORN EY Patented ug. 16,V 1949 Y Y z ,r'zazoa` Y Y y Lan J en Chu, Brookline, Mass., assigner, by mesne ssignm'ents,"t`o` tlieUnited States of America as1represcnted.by.the Secretary of l f Aereaengage.er

eclaimsv.. (C1150- salem This invention relates "to antenna andmore participara to' ritenne adapte@ for lise win; highA frequency'communication systeins.' i"

'Figfl illustrates-orie embodiment of theinvention; and; l. A

Fig'.- l2l illustrates-a preferred. embodiment-ofthe invention.-

Fig.- 3`-illustrates a sectional Aview takenv alongV line-S-ofiig. l; anda Fig. 4-illustrates yal sectional-,view taken: along 1ine.4-4ioff.fFig.1.u" M u Rectangular wave guide 5 has a pluralitylloffr apertures y'82preferably in one narrow wall 6 thereof, these apertures being` spaced apart a distance a which isYsubst'aritially equal to a wavelengthinrthe jguide,r and .is .terminatedbytanf adjustable'plunger 1. Parallel plat'elwaveguidef Comprisinewo, .coniugare .,paalllel-plaii filetes ID and I,"extends generally normal to the wall E of lwave guide 5 in whichithe aperture 8lare provided.y Y f waveguide. 9. restricts remedied@ fregi @l2-11.- tures 8 to the spa`ce betwe n itsuplates I0 and IIJ', that is, generally speaking; to a plane normal to Wave guide 9 is terminated by a movable plunger.; I I along the side opposed to apertures 8. As will be apparent from the explanation to follow, the other two sides I'2 and I3 of wave guide 9 may be closed or not, as desired.

One plate I of wave guide 9 has a plurality of apertures I4 therein spaced apart a distance b corresponding to the wavelength in wave guide 9, which may be the same as the free space wavelength at the frequency contemplated.V

If energy is directed into wave guide in the direction of plunger 1, part of the energy will leak or escape through apertures 8. Plunger 1 may be faced with energy-absorbent material, or have a reflecting surface, and is adjusted to reduce the standing wave ratio to a minimum in wave guide 5. As shown in Fig. 3, plunger I m'oves Within Wave guide 5 in the direction of the arrow. T0 make a desired adjustment, set screw 3D is moved, in the direction of the arrow, Within slotted portion 3I of wave guide 5. It is preferred that distance a approach the free space wave length, and in any event since energy escaping from apertures 8 is in phase, the major portion of the energy will be directed normally to the wall 6 containing apertures 8.- Thus', it'willbe seen that-itis not necessary'to haveslde walls" I2 arid vI3 to'fvvaveV- gli eS although th'es may 'be'inclded toiinini? iriiaethe fescapel'f( energy conta 1 a longitudinal central line alongA bfad waIlI Therefore?prtrs'* |15 mairie pcdfrom apertures lrrby a distance a substantially a half wave length in the wave guide I5 at the frequency involved, and by staggering apertures I1 and I8 on opposite sides of the longitudinal median line of broad wall I5, radiation from al1 the apertures will be in phase. A parallel plate Wave guide I9 having plates 2D and 2D may be extended generally normal to broad wall I5 in a manner similar to that in which parallel plate wave guide 9 extends normally to narrow wall 6 of wave guide 5 in'Fig. 1. In one plate 20 of wave guide I9 of Fig. 2 are an array of apertures 2! and 22 aligned with apertures I1 and I8 respectively, and also spaced apart a distance a in the direction parallel to broad wall I6. In the direction normal to broad wall I6 they may be spaced apart a distance b substantially equal to one Wave length in free space. Thus a narrow directed pencil beam will extend normally to plate 20 containing apertures 2I and 22.

A further improvement may be obtained Vby reducing the distance b' (or b) to a value less than the free space wavelength, even though slightly less, which will result in materially reducing side lobes. The radiation then will not be normal to plate 20, but Will still be a pencil, or directed beam, with side lobes reduced. Although not shown in Fig. 2, adjustable plungers may be used in a manner similar to that in which they are employed in the device shown in Fig. 1 in order to reduce standing Waves Within wave guides I5 and I9.

As is Well known in the art, antennas having directive effects in radiation conversely have like directive effects in reception and similar structures may be used for radiation or reception of electromagnetic energy.

Many variations will be apparent to those skilled in the art, and therefore it is not desired to restrict the scope of the invention to the precise embodiment herein disclosed.

What is claimed is:

1.' In combination, a rectangular Wave guide having apertures along one Wall thereof spaced at equal intervals of substantially one Wavelength in the guide at the operating frequency, and a parallel plate Wave guide whose plates eX- tend substantially normal from said one Wall, one of said plates having openings therein in alignment in a direction normal to said one Wall with the apertures in said one Wall and spaced apart substantially one free-space Wavelength at the operating frequency in the direction normal to said one Wall, whereby a pencil beam of electromagnetic energy may be radiated into space from said parallel plate Wave guide in a direction normal to the said one plate.

2. The combination of claim 1, including an adjustable plunger termination in said rectangular Wave guide and an adjustable plunger termination in said parallel plate Wave guide.

3. In combination a rectangular wave guide having apertures equally spaced along one wall thereof, and a parallel plate wave guide having plates which extend substantially normal from said one Wall, one of said plates having openings in alignment in a direction normal to said Wall with said apertures, said openings being also aligned in a direction parallel to said Wall, and spaced apart equally in a direction normal to said Wall, whereby a pencil beam of electromagnetic energy may be radiated into space from said openings.

4. The combination of claim 3 including an adjustable plunger termination in said rectangular Wave guide and an adjustable plunger termination in said parallel plate Wave guide.

5. A directive antenna comprising a rst rectangular wave guide having apertures along one Wall thereof spaced at equal intervals of substantially one half Wave length in the guide at the operating frequency, said apertures being staggered on opposite sides of the longitudinal median line of said Wall, and a parallel plate Wave guide Whose plates extend substantially normal from said one Wall, one of said plates having openings therein in alignment in a direction normal to said one Wall with the apertures in said one Wall and spaced apart in the direction parallel to said one Wall at intervals equal to those of the apertures in said one Wall, said plate openings being spaced apart in the direction normal to said one Wall at equal intervals of substantially one wave length in free space at the operating frequency.

6: VA directive antenna comprising a rst rectangular wave guide, one of the walls thereof having a plurality of equally spaced apertures formed therein, said apertures being staggered on opposite sides of the longitudinal median line of said Wall, and a second Wave guide including two parallel plates normal to said apertured Wall and enclosing said-apertures, one of said enclosing plates having apertures therein in alignment in a direction normal to said one Wall with the apertures in said one wall and spaced apart in the direction parallel to said one Wall at intervals equal to those of the apertures in said one wall, said plate apertures being spaced apart at predetermined intervals in the direction normal to said one Wall.

LAN JEN CHU.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 2,226,479 Pupp Dec. 24, 1940 2,297,202 Dallenbach Sept. 29, 1942 OTHER REFERENCES Ser. No. 353,755, Dallenbach (A. P. C.) pub. May 25, 1943.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2226479 *Jan 22, 1938Dec 24, 1940Pintsch Julius KgApparatus for mechanically and electrically connecting conductors carrying high frequency currents
US2297202 *Mar 5, 1937Sep 29, 1942Collenbusch HugoTransmission and/or the reception of electromagnetic waves
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2596480 *Nov 20, 1947May 13, 1952Canada Nat Res CouncilDirective antenna for microwaves
US2600179 *Feb 18, 1946Jun 10, 1952Andrew AlfordSplit cylinder antenna
US2659002 *Mar 29, 1946Nov 10, 1953Keeler Price MSplit truncated cone-antenna
US2681990 *Apr 3, 1946Jun 22, 1954Us NavySlot array antenna
US2703841 *Aug 1, 1945Mar 8, 1955Purcell Edward MAntenna
US2721939 *May 1, 1951Oct 25, 1955Glenn L Martin CoSlotted waveguide antenna array
US2778016 *Jan 23, 1953Jan 15, 1957Gabriel CoWave guide antenna
US2807800 *Sep 13, 1955Sep 24, 1957CsfHigh frequency directional aerials
US3078463 *Nov 6, 1959Feb 19, 1963CsfParallel plate waveguide with slotted array and multiple feeds
US3101469 *May 28, 1953Aug 20, 1963Varian AssociatesPhase coherent radar system
US3135959 *Mar 24, 1960Jun 2, 1964Decca LtdDoppler antenna array employing multiple slotted waveguides with feed switching
US3328800 *Mar 12, 1964Jun 27, 1967North American Aviation IncSlot antenna utilizing variable standing wave pattern for controlling slot excitation
US4120085 *Aug 6, 1976Oct 17, 1978Texas Instruments IncorporatedBeam type planar array antenna method of fabrication
US4755821 *Jul 18, 1986Jul 5, 1988Kabushiki Kaisha ToshibaPlanar antenna with patch radiators
US4985708 *Feb 8, 1990Jan 15, 1991Hughes Aircraft CompanyArray antenna with slot radiators offset by inclination to eliminate grating lobes
US5173714 *May 3, 1990Dec 22, 1992Arimura Giken Kabushiki KaishaSlot array antenna
US5177496 *Apr 20, 1990Jan 5, 1993Arimura Giken Kabushiki KaishaFlat slot array antenna for te mode wave
US5239311 *Apr 6, 1992Aug 24, 1993Arimura Giken Kabushiki KaishaFlat slot array antenna
US5486837 *Dec 21, 1994Jan 23, 1996Miller; Lee S.Compact microwave antenna suitable for printed-circuit fabrication
DE3926187A1 *Aug 8, 1989Apr 12, 1990Arimura Inst TechnologySchlitzstrahler
DE3926188A1 *Aug 8, 1989Feb 15, 1990Arimura Inst TechnologySchlitzstrahler
DE4013934A1 *Apr 30, 1990Nov 29, 1990Arimura Inst TechnologyFlacher schlitzgruppenstrahler fuer te-modus-welle
Classifications
U.S. Classification343/771, 333/33, 343/780
International ClassificationH01Q13/20
Cooperative ClassificationH01Q13/20
European ClassificationH01Q13/20