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Compact signal isolating microwave splitters/combiners
| Details |
Inventors: Myer, Robert E.;
Assignee: AT&T Bell Laboratories (Murray Hill, NJ)
Primary Examiner: Gensler; Paul
Assistant Examiner:
Attorney, Agent or Firm: Kip, Jr.; Ruloff F.
A microwave splitter/combiner has a flat housing comprising similar top and bottom horizontal circular cover plates joined at their peripheries by an annular flange of short vertical length. The top plate and flange mount on their respective outsides a primary signal transfer coaxial connector and a plurality of secondary signal transfer connectors of which the latter are spaced around the flange. A plurality of first coaxial line sections inside the housing lie in a common horizontal plane and are all coupled to the primary connector and each coupled to a respective one of such secondary connectors, the housing being suitably apertured to permit such couplings. A plurality of second coaxial line sections inside the housing are respectively coupled to such first sections and are all coupled to each other in such fashion as to suppress the appearance at the secondary connectors of extraneous signals. Such second sections are L-shaped and lie in respective planes departing from the horizontal by at most a small acute angle. |
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DETAILED DESCRIPTION OF EMBODIMENT Referring now to FIGS.
1-6, the reference numeral 20 designates a microwave assemblage of which the structure is functionally suitable for use as either a six-way splitter or six-way combiner, but which will initially herein be considered to be a combiner.
The combiner 20 has a vertical axis 21, and upper and lower axially spaced hubs 22 and 23 coaxial with axis 21.
Upper hub 22 is in the form of a moderately thick circular cylindrical disc having its centerplane normal to axis 21, and having therein a large circular cylindrical bore 30 (FIG.
5) extending axially all the way through the hub.
Bore 30 at its lower end has an internally threaded wall with which is engaged peripheral threading on a closure disc 31 adapted by turning it to be removed from the bore to provide access to its interior.
In FIG.
2, disc 31 is shown as only partly screwed into bore 30.
At the upper end of bore 30 is a rigid primary coaxial signal transfer connector 35 of standard N type construction and mounted by screws 36 on the top of hub 22 to close off and be coaxial with bore 30.
Connector 35 has a tubular outer conductor 37 externally threaded at its top, and the connector also has an inner filamental conductor 38 extending axially forward of conductor 37 to form a pin 39 projecting down into bore 30.
When assemblage 20 is in use, the primary connector 35 is adapted to be electromechanically coupled to means which is external to the assemblage and which, for example, may be a coaxial cable 40 (FIG.
5) having at its end rear device 20 a fitting comprising a rotatable internally threaded cap 41 adapted to be threaded onto connector 35 to thereby couple the cable and connector together.
Cable 40 may lead to, say, an antenna or other device (not shown) which, when assemblage 20 is a combiner, receives and utilizes the composite microwave signal which is the output of the combiner 20.
Equiangularly spaced around hub 22 are six small bores 45a-45f (FIG.
3) formed in the hub to be normal to axis 21 and extend radially from large bore 30 entirely through hub 22 to its outer periphery
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