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Publication numberUS3087125 A
Publication typeGrant
Publication dateApr 23, 1963
Filing dateJul 13, 1961
Priority dateJul 13, 1961
Publication numberUS 3087125 A, US 3087125A, US-A-3087125, US3087125 A, US3087125A
InventorsScholefield Clifford L
Original AssigneeGen Electric
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Coaxial reed relay for interrupting the center conductor and simultaneously terminating its opened ends
US 3087125 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

FIELD OR INTERRUPTING THE A ril 23, 1963 c. 1.. SCHOLE 0 COAXIAL REED RELAY E CENTER CONDUCTOR AND SIMULTANEOUSLY TERMINATING ITS OPENED ENDS Filed July 13, 1961 m 9 E M 0 A 7 y 2K 5 6 l 1 z E V v B u w. a 5 C0 I A r w M 0 a A M H P 0 0 X Z 6 MW 00 P r -2? 1 m w l I l P 2 a 2 E 4 l 2 [r7 vent-or: C/ffford L. Scho/ef/e/d,

H/S Agent.

United States Patent U 3,037,125 COAXlAL REED RELAY FOR INTERRUPTING THE CENTER CONDUCTOR AND SIMULTANEOUSLY TERMINATING ITS OPENED ENDS Clifiord L. Scholefield, Greene, N.Y., assignor to General Electric Company, a corporation of New York Filed July 13, 1961, Ser. No. 123,882 1 Claim. (Cl. 333-7) This invention pertains, in general, to switching devices; and, in particular, to electromagnetically controlled switches, or relays, useful for switching electrical energy containing high frequency components, such as radio frequency and video frequency signals, in coaxial cable transmission lines.

Many presently used switches and relays are not entirely adequate for switching high frequency electrical energy in coaxial transmission lines for, among others, the following reasons:

(1) Often, presently used switches and relays are relatively complex, bulky and expensive. For example, they are not easily adaptable for use with coaxial cable. Often, to adapt such switches and relays for use with coaxial cable, auxiliary connectors of a complex nature are required.

(2) In order to keep electrical energy reflections small, it is required that tolerances in the machining of parts be closely held. Moreover, these parts must be accurately assembled and aligned.

(3) Many presently used switches and relays require signals of a relatively high power level to operate them. Often, too, such switches and relays do not respond quickly to control signals.

(4) In general, the complexity of many presently used switches and relays tends to promote unreliable switching and transmission functions.

Accordingly, the general objects of this invention include: the provision of a relatively simple, compact and inexpensive relay adaptable for use with coaxial cable transmission lines; the provision of such a relay wherein electrical energy reflections are kept at a minimum; and, the provision of such a relay which responds relatively quick in response to control signals of a relatively low power level.

Among the many kinds of switching devices widely used for the switching of direct currents and low frequency currents is the reed switch, or reed relay. In one of its more common construction forms, the reed relay comprises a pair of cantilever-suspended magnetizable reeds arranged within a hermetically sealed glass envelope; the freely suspended ends of the reeds being situated in spaced-apart, overlapping relationship. When a coil, encompassing the envelope, is energized, the magnetic field introduced into the magnetizable reeds causes the reeds to move into mutual contact due to the forces of magnetic attraction thereby completing an electrical circuit through the reeds. Advantageously, reed relays are relatively simple, compact, reliable and inexpensive components. They respond rather quickly to control signals. Moreover, they may be controlled by signals of a relatively low power level.

Accordingly, a specific object of this invention is to provide a relay, of the reed-relay type, which is particularly suitable for integral coupling with coaxial cable.

Another specific object of this invention is the provision of a reed-type relay having electrical characteristics compatible with the coaxial cable transmission line which it controls; such relay being selectively operable so that the line may be terminated in its characteristic impedance, preventing the translation of high frequency signals through the line; or, in the alternative, to provide conice tinuity along the coaxial cables center conductor to enable translation of high frequency signals.

The following summary will serve to provide an initial appreciation of the general nature of the coaxial relay of this invention:

A reed-type relay is combined with a coaxial cable coupling member; the coaxial cable coupling member comprising: an annular sheath conductor and a discontinuous center conductor comprising two conductor lengths, axially aligned within the annular sheath conductor; such coaxial coupling member being suitable for electrically connecting two coaxial cable lengths. Situated within the sheath conductor and between the two lengths of center conductor is a reed-type switch comprising: a pair of cantilevensuspended magnetizable reeds supported and housed in a hermetically sealed envelope of dielectric material. The supported ends of each reed are connected with a different one of the center conductor lengths to enable continuity therebetween. Supported within the dielectric envelope and protruding therethrough are resistance elements so arranged, with respect to each magnetizable reed, that electrical continuity between each center conductor length and the annular sheath conductor is enabled to allow the coaxial transmission line to be terminated in its characteristic impedance. Scribed, or suitably printed, on the outer surface of the dielectric envelope is a spiral-like electrical path which provides a control coil for operating the reed switch. The coil may also be located external to the outer sheath conductor because the sheath material will not obstruct the magnetic flux lines.

A fuller appreciation of the objects, hereinbefore stated, of this invention will be realized by referring to the following detailed description, and claim, read in connection with the drawings in which:

FIGURE 1 is a perspective view, in section, of the coaxial relay embodying the invention; and,

FIGURE 2 is a perspective view, partly in section, of the dielectric envelope having a control coil integral therewith, employed in the coaxial relay shown at FIG- UR=E 1.

An illustration of one embodiment of the coaxial relay of this invention is provided at FIGURE 1 of the drawing. The coaxial relay, there illustrated, is in its normal status; i.e., the coil 10 is not energized. Accordingly, the two reeds 11 and 12 are biased, by virtue of their alignment and natural strains, to assume the attitudes shown: The reed 1 1 is in contact with the resistive element 13. The reed 12 is in contact with the resistive element 14.

When the coil 10 is energized by applying a potential difference between the coil leads 15 and 16, current passing through the coil creates a magnetic field which is generally oriented along the longitudinal axes of the reeds. Magnetic poles of opposite polarity appear at the freely suspended ends of the reeds; i.e., at the ends 11a and 12a. Consequently, the reeds 11 and 12 are, by the force of magnetic attraction, pulled together thereby causing electrical continuity between the two center conductor lengths 17 and 18.

In its normal status (coil 10 not energized), the reed ends 11a and 12a, respectively, connect the center conductor lengths 17 and 18 through the resistive elements 13 and 14, by means of the leads 19 and 20, to the annular sheath conductor 21, as shown at FIGURE 1 of the drawing. The resistive elements 13 and 14 and the dielectric filler material member 22 may be suitably chosen and proportioned such that the coaxial relay, when in its normal status, functions to terminate a length of coaxial cable in its characteristic impedance. On the other hand, when the coil 10* is energized, the center conductor lengths 17 and 18 are connected through the contacting reeds 11 and 12. Accordingly, a high frequency potential difference, applied between the annular sheath conductor 21 and the center conductor length 17, may be translated through the coaxial relay to a coaxial cable (suggested by the dotted line representation shown at FIGURE 1). The coaxial relay may be integrally coupled, in-line with, the section of coaxial cable, by interconnecting the relays center conductor length 18 and the annular sheath conductor 21 to the coaxial cable by means of a coaxial conneotor suitable for the purpose. Such connectors are well known to those persons skilled in the art. See, for example, chapter 8 of volume 1 of the text Very High- Frequency Techniques, authored by the Radio Research Laboratory Staff of Harvard University and published by the McGraw-Hill Book Company (copyright 1947).

At FIGURE 2 of the drawing, there is illustrated an especially advantageous means for housing, and controlling, the reeds and resistive elements. An envelope 23 has a coil configuration 10 integral therewith. The envelope 23 is a closed tubulation of dielectric material having a coil configuration 10' scribed, suitably printed or otherwise bonded on the outer surface thereof. The coil leads and 16 may be suitably connected to the coil configuration terminations by directly bonding them to the coil terminations. Ways and means of doing this are well known.

The small apertures 24 and 25 ahe provided in the annular sheath conductor 21 for bringing out the leads 15 and 16 to a suitable source of coil potential (not shown). The envelope 23 is fashioned from a suitable dielectric material such as glass, a plastic-like compound, or the like; such material being, advantageously, easily plasticized by the application of heat and, subsequently, cooled to support and seal the reeds and resistive elements therewithin.

Many materials and parts are available for constructing the coaxial relay of this invention. Accordingly, the following materials are to be understood as being illustrative of, not limited to, those which may be employed in constructing the relay of this invention;

Copper, or aluminum, may be used for the coil configuration 10; the coil leads 15 and 16; the center conductor lengths 17 and 18; the leads 19 and 20; and, the annular sheath conductor 21.

The resistive elements 13 and 14 may be fashioned from a ceramic resistance material such as ferrite or from a hardened carbon compound.

The coil 23 may be fashioned from such materials as are hereinbefore set forth.

The dielectric filler material 22 may be polyethylene or the like.

Although one embodiment of the invention has been described and illustrated, it is obvious that many changes, substitutions of elements and materials, as well as arr-angements of parts, may be made without departing from the spirit and scope of the invention as is hereinafter defined in the claim.

What is claimed is:

A coaxial relay, for switching electrical energy containing high frequency components in a coaxial cable transmission line, comprising: an annular sheath of electrically conductive material and a pair of separated center conductors coaxially aligned within the annular sheath conductor, the annular sheath conductor and center conductors being adaptable for integral in-line coupling in a coaxial cable transmission line; an envelope of dielectric material situated between the separated center conductors; a coil configuration of electrically conductive material bonded on the envelopes outer surface; a pair of cantilever-suspended magnetizable reeds sealed Within and protruding through the envelope, each center conductor being connected to a different protruding reed; a pair of resistive elements sealed within and protruding through the envelope; connection means for electrically connecting each resistive element to the annular sheath conductor; and, dielectric material filling the space between the inside surface of the sheath conductor and encompassing the center conductors and envelope; each reed being normally in contact with a different one of the resistive elements whereby the coaxial cable transmission line is terminated in its characteristic impedance.

References Cited in the file of this patent UNITED STATES PATENTS 2,264,124 Schreiner Nov. 25, 1941 2,958,054 Concelman Oct. 25, 1960 2,993,104 Zimmer July 18, 1961 3,019,402 Lanctot Jan. 30, 1962 3,027,524 May Mar. 27, 1962

Patent Citations
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US2264124 *Jun 27, 1940Nov 25, 1941Bell Telephone Labor IncRelay
US2958054 *Nov 24, 1958Oct 25, 1960Amphenol Borg Electronics CorpImpedance terminated coaxial line switch apparatus
US2993104 *Jan 21, 1959Jul 18, 1961Gen ElectricElectromagnetic relay
US3019402 *Feb 1, 1960Jan 30, 1962Don Lan Electronics IncStep attenuator
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3201540 *Mar 19, 1963Aug 17, 1965Canada Nat Res CouncilShielded reed switch
US3202784 *Mar 13, 1963Aug 24, 1965Int Standard Electric CorpCoaxial vacuum relay having plural contacts
US3204058 *Sep 19, 1962Aug 31, 1965Standard GribsbyElectrical reed relay having plug-in features
US3258557 *Aug 28, 1964Jun 28, 1966Philips CorpReed for a reed relay
US3264581 *Dec 3, 1963Aug 2, 1966Gen Microwave CorpCoaxial switches and systems for microwave systems which may include those in which signal flow in unused paths is prevented by dimensioning for cutoff of waveguide mode
US3319194 *Oct 8, 1965May 9, 1967Hewlett Packard CoVariable attenuator employing internal switching
US3355684 *Oct 31, 1966Nov 28, 1967Bell Telephone Labor IncCoaxial cable switch
US3461386 *Jan 17, 1966Aug 12, 1969Automated Measurements CorpCoaxial switch using reed switch and assembly and system with isolated actuating coil
US3470499 *Oct 4, 1966Sep 30, 1969Amp IncMatched switch matrix
US3504188 *Sep 13, 1967Mar 31, 1970Amp IncShielded video 2 x 2 switch
US3568096 *Aug 11, 1969Mar 2, 1971Bell Telephone Labor IncApparatus for automatically switching high frequency signals
US3906405 *Jul 1, 1974Sep 16, 1975Motorola IncTunable antenna coupling circuit
US3958199 *Jan 31, 1975May 18, 1976Amp IncorporatedHigh voltage relay package
US4074099 *Dec 27, 1976Feb 14, 1978The United States Of America As Represented By The Secretary Of The NavyCoaxial, polarity-reversing switch
US4187416 *Oct 10, 1978Feb 5, 1980The United States Of America As Represented By The Administrator Of The National Aeronautics And Space AdministrationHigh power RF coaxial switch
US4908588 *Jun 2, 1988Mar 13, 1990Hu Development CorporationMatrix switch
US8327527 *Mar 18, 2009Dec 11, 2012Ht Microanalytical, Inc.Integrated reed switch
US8665041Mar 16, 2010Mar 4, 2014Ht Microanalytical, Inc.Integrated microminiature relay
US20130063233 *Sep 4, 2012Mar 14, 2013Todd Richard ChristensonIntegrated Reed Switch
DE3417658A1 *May 12, 1984Apr 25, 1985Adret ElectroniqueEinfuegungsschalter fuer eine hoechstfrequenz-uebertragungsleitung
U.S. Classification333/262, 200/504, 335/5
International ClassificationH01P1/12, H01H51/28, H01P1/10, H01H51/00
Cooperative ClassificationH01P1/125, H01H51/287
European ClassificationH01P1/12C, H01H51/28F