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Publication numberUS2926317 A
Publication typeGrant
Publication dateFeb 23, 1960
Filing dateMar 11, 1954
Priority dateMar 11, 1954
Publication numberUS 2926317 A, US 2926317A, US-A-2926317, US2926317 A, US2926317A
InventorsDaniel Blitz
Original AssigneeSanders Associates Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Transmission line
US 2926317 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

Feb. 23, 1960 D. BLITZ TRANSMISSION LINE Filed March 11, 1954 n. 3 w/ w. .W. F m M ha v. i m m z 9 m .m 7 S F N/a I! w Daniel Blitz IN V EN TOR.

United States Patent TRANSMISSION LINE Daniel Blitz, Boston, Mass., assignor, by mesne assignments, to Sanders Associates, Incorporated, Nashua, N.H., a corporation of Delaware Application March 11, 1954, Serial No. 415,493

Claims. (Cl. 333-84) The present invention relates to transmission lines. More particularly, the present invention relates to the use of transmission lines such as are used in association with high frequency electronic devices.

In modern shortwave techniques, transmission lines in a form familiarly known as wave guides are widely used. Because of the construction these wave guides occupy a large volume of space, are heavy and are expensive to manufacture.

Theoretically, a transmission line composed of inner conductors of finite width and spaced between outer conductors that are parallel and of infinite width would permit no radiation of high frequency energy from the line. By selecting the width of the outer conductors to be sufiicient- 1y greater than that of the inner conductors, a transmission line of relatively low loss due to radiationis obtained.

Asan alternative to wave guides, these configurations may be more readily employed with printed and etched circuit techniques. A propensity of these alternative con figurations toward the propagation of high frequency energy in undesirable modes has been the source of much difficulty.

It is therefore an object of the present invention to provide an improved transmission line that excludes undesirable propagation modes of high frequency energy; and

A further object of the invention is to provide an improved transmission line of the character described in which the relative movement of its parts has substantially no effect on the electrical characteristics of the line.

Other and further objects of the invention will be apparent from the following description of a typical embodiment thereof, taken in connection with the accompanying drawings.

In accordance with the invention there is provided a composite, high-frequency, electric transmission line. The line includes a pair of thin, elongated, parallel, planar, etched-circuit-type, outer conductors providing electrical ground planes. A thin, elongated planar, etched-circuittype inner conductor is disposed in parallel with and between the outer conductors. The inner conductor is of lesser width than the outer conductors. A solid dielectric, planar insulating panel wider than the inner conductor is disposed between the inner conductor and one of the outer conductors for securing the inner conductor in insulated spaced relation with respect to the outer conductor. Another solid dielectric planar insulating panel is secured to the other of the outer conductors and is disposed between the inner and the otherouter conductor. A pair of thin, elongated, planar, etched-circuit-type, capacitive, strip conductors are affixed to a surface of the first insulated panel adjacent opposite sides of the inner condoctor. The capacitive strip conductors are spaced transversely less than a half wave length apart at the highest operating frequency. A second pair of thin, elongated, etched-circuit-type capacitive stripconductors are affixed to the second insulating panel. They are so disposed as to register with the first pair of strip conductors. The

facture and reliability of operation of these be wider than conductor 14 thickness of the strip conductors is so chosen relative to the inner conductor as to provide a space between adjacent ones of the strip conductors in register. Conductive rods extend from the outer conductors through the insulating panel through the adjacent strip conductors corresponding with each outer conductor to effect an electrical coupling between the outer conductors. This enables relative movement therebetween without substantially varying the electrical characteristics of the transmission line.

In the accompanying drawings:

Fig. 1 is a three-dimensional view of a three-plate transmission line embodying this invention;

Fig. 2 is a cross-sectional view of a four-plate transmission line embodying the present invention;

Fig. 3 is a cross-sectional view of a four-plate transmission line illustrating another embodiment of the invention;

Fig. 4 is a schematic diagram of a source of energy connected to the transmission line of Fig. l; and

Fig. 5 is a schematic diagram of a source of energy connected to the transmission line of Fig. 2.

Referring now in more detail to the drawings, an outer.

conductor 1 is attached to the upper surface of a dielectric 2 with a suitable cement. An inner conductor 3 is attached to the under surface of the dielectric 2. An outer conductor 5 is attached to the under surface of a dielectric 4. Pins 7 pierce outer conductor 1, dielectric 2 and contact strip 6. Pins 7 pierce outer conductor 5 and dielectric 4. Outer couductors land 5 are capacitively coupled through. contact strip 6 and pins 7 because of their proximity. The pins 7 are positioned in pairs in the direction of the length of the line at intervals 8 less than a quarter-wave long at the operating frequency and at transverse intervals 10 less than a half-wave long at the operating frequency. This arrangement permits limited relative transverse movement between the line sections as shown, without substantially varying the electrical characteristics of the line.

In Fig. 2 there is shown an embodiment of this invention wherein a four-plate line is provided. The inner conductors 13 are connected to the same voltage source. Since the fields between each inner conductor and its associated outer conductor are maintained relatively constant, limited transverse motion between the inner conductors in the direction as indicated at 9 is permissible without substantially varying the electrical characteristics of the line. As shown in Fig. 3, inner conductor 15 may to permit limited transverse motion between them in the direction as indicated at 17.

In Fig. 4 a source 16 of high frequency energy is shown connected to the three-plate transmission line of Fig. 1, viewed in longitudinal crosssection. The inner conductor 3 is connected to one electrical side; the outer conductors 1 and 5 are connected together to the ground side of source 16.

In Fig. 5 the source 16 is shown connected to the fourplate transmission line of Fig. 2, viewed in longitudinal cross-section. The inner conductors 13 are connected together to one side of the source; the outer conductors are connected together to the ground side 15, as shown.

Since the physical parameters of the transmission line as described above may be varied without substantially reducing the efficiency of the line, the economy of manudevices is greatly enhanced.

While there has been hereinbefore described what is at present considered a preferred embodiment of the invention, it will be apparent that many and various changes and modifications may be made with respect to the embodiment illustrated without departing from the spirit of the invention. It will be understood, therefore, that all those changes and modifications as fall fairly within the scope of the present invention, as defined in the appended claims, are to be considered as a part of the present invention.

What is claimed is: V

l. A composite, high-frequency, electric, transmission line, comprising: a pair of thin, elongated, parallel, planar, etched-circuit-type, outer conductors providing electrical ground planes; a thin, elongated, planar, etched-circuit-type, inner conductor disposed in parallel with and between said outer conductors, said inner conductor being of lesser width than said outer conductors; a first solid, dielectric, planar, insulating panel wider than said inner conductor and disposed between said inner conductor and one of said outer conductors for securing said inner conductor in insulated, spaced relation with respect to said outer conductor; a second solid, dielectric, planar, insulating panel secured to the other of said outer conductors and disposed between said inner and said other outer conductor; a pair of thin, elongated, planar, etched-circuit-type, capacitive, strip conductors aflixed to a surface of said first insulating panel adjacent a side of said inner conductor and spaced tranversely less than a half wave length apart at the operating frequency; a second pair of thin, elongated, etched-circuit-type, capacitive strip conductors affixed to said second insulating panel and so disposed as to register with the first said pair of strip conductors, the thickness of said strip conductors being so chosen relative to saidinner conductor as to provide a space between adjacent ones of said strip conductors in register; and conductive rods extending from Said outer conductors through said insulating panel to said adjacent strip conductors corresponding with each outer conductor to eifect an electrical coupling between said outer conductors and to enable relative movement therebetween without substantially varying the electrical characteristics of said transmission line.

2. A composite, high-frequency, electric, transmission line, comprising: a pair of thin, elongated, parallel, planar, etched-circuit-type, outer conductors providing electrical ground planes; a thin, elongated, planar, etchedcircuit-type inner conductor disposed in parallel with and between said outer conductors, said inner conductor being of lesser width than said outer conductors; a first solid, dielectric, planar, insulating panel wider than said inner conductor and disposed between said inner conductor and one of said outer conductors for securing said inner conductor in insulated, spaced relation with respect to said outer conductor; a second solid, dielectric, planar, insulating panel secured to the other of said outer conductors and disposed between said inner and said other outer conductor; a pair of thin elongated, planar, etchedcircuit-type, capacitive, strip conductors affixed to a surface of said first insulating panel laterally adjacent opposite sides of said inner conductor and spaced transversely less than one-half wave length apart at the highest operating frequency; a second pair of thin, elongated, etchedcircuit-type capacitive strip conductors affixed to said second insulating panel and so disposed as to register with the first said pair of strip conductors, thethickness of said strip conductors being so chosen relative to said inner conductor as to provide a space between adjacent ones of said strip conductors in register; and means for supporting and electrically coupling said strip conductors to said outer conductors to enable relative movement of said outer conductors without substantially varying the electrical characteristics of said transmission line.

3. A composite, high-frequency, electric, transmission line, comprising: a pair of thin, elongated, parallel, planar, etched-circuit-type, outer conductors providing electrical ground planes; a pair of solid dielectric, planar, insulating panels secured to said outer conductors and disposed between said outer conductors; a pair of thin, elongated, planar, etched-circuit-type, inner conductors disposed in register and in parallel with and between 4 said outer conductors, said inner conductors being of lesser width than said outer conductors and bonded to the inner surfaces of said solid, insulating panels; pairs of thin, elongated, planar, etched-circuit-type, capacitive, strip conductors afiixed to the inner surface of each insulating panel laterally adjacent opposite sides of each inner conductor and spaced transversely less than onehalf a wave length apart attthe highest operating frequency, the thickness of said strip conductors being so chosen relative to said inner conductors as to provide a space between adjacent ones of said strip conductors in register; and means for supporting said strip conductors to effect an electrical coupling between said outer conductors and to enable relative movement therebetween without substantially varying the electrical characteristics of said transmission line.

4. A composite, high-frequency, electric transmission line, comprising: a pair of thin, elongated, parallel, planar, etched-circuit-type, outer conductors providing electrical ground planes; a pair of solid, dielectric, planar, insulating panels secured to said outer conductors and disposed between said outer conductors; a pair of thin, elongated, planar, etched-circuit-type, inner conductors of differing widths disposed in register and in parallel with and between said outer conductors, said inner conductors being of lesser width than said outer conductors and bonded to the inner surfaces of said solid insulating panels; pairs of thin elongated, planar, etched-circuittype, capacitive, strip conductors atfixed to a surface of each insulating panel laterally adjacent opposite sides of each of said inner conductors and spaced transversely less than one-half wave length apart at the highest operating frequency, the thickness of said strip conductors being so chosen relative to said inner conductors as to provide a space between adjacent ones of said strip conductors in register; and means for supporting said adjacent strip conductors to effect an electrical coupling between said outer conductors and to enable relative movement therebetween without substantially varying the electrical characteristics of said transmission line.

5. A composite, high-frequency, electric, transmission line, comprising: a pair of thin, elongated, parallel, planar, etched-circuit-type, outer conductors providing electrical ground planes; a pair of solid, dielectric, planar, insulating panels secured to each of said outer conductors and disposed between said outer conductors; pairs of thin, elongated, planar, etched-circuit-type, inner conductors of differing widths disposed in register and in parallel with and between. said outer conductors, said inner conductors being of lesser width than said outer conductors and bonded to the inner surfaces of said insulating panels; pairs of thin, elongated, planar, etched-circuit-type capacitive strip conductors afiixed to the surfaces of each of said insulating panels laterally adjacent opposite sides of said inner conductors and spaced transversely less than one-half wave length apart at the highest operating frequency, said strip conductors being in register and of a thickness chosen relative to said inner conductors as to provide a space between adjacent ones of said strip conductors in register; and conductive rods extending from said outer conductors through said'insulating panels to said adjacent strip conductors corresponding with each outer conductor to effect an electrical coupling between said outer conductors and to enable relative movement therebetween without substantially varying the electrical characteristics of said transmission line.

References Cited in the file of this patent UNITED STATES PATENTS 2,155,508 Schelkunoff Apr. 25, 1939 2,445,380 Zottu July 20, 1948 2,603,749 Kock July 15, 1952 (Other references on following page) V E") 6 UNITED STATES PATENTS 570,087 Great Britain June 21, 1945 Grieg Oct 18, 1955 1 601,514 Great Britain May 7, 1948 Blitz Oct. 20, 1957 Sommers Nov. 5, 1957 OTHER REFERENCES v 5 Radio, Electronic Engineering"; September 1951; pp. FOREIGN PATENTS 16 and 31. 7

Great Britain Nov. 25, 1941

Patent Citations
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
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Classifications
U.S. Classification333/238
International ClassificationH01P3/08
Cooperative ClassificationH01P3/085
European ClassificationH01P3/08C