Telecommunications – Wireless distribution system
Patent
1997-05-01
2000-06-06
Faile, Andrew I.
Telecommunications
Wireless distribution system
174 35R, 361826, 439 63, 348 6, H01R 1315
Patent
active
060729813
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
The present invention relates to a multi-tap distribution apparatus. More particularly, the present invention relates to a multi-tap distribution apparatus which is suitable for use with CATV cables.
BACKGROUND ART
Generally, CATV transmission cables are connected to subscribers via multi-tap distribution apparatuses. CATV stations transmit through the cables not only television signals and control signals but also currents for operating main line amplifiers.
While some distribution apparatuses are not designed for passing currents, there are those designed for this purpose. The later type of distribution apparatuses are provided with a current transmission circuit either installed in the high-frequency passing route or installed as a separate circuit. The aforementioned high-frequency passing route originating in a cable connecting portion and leading to taps via a branch circuit and a distribution circuit.
In the latter type of distribution apparatus, the large currents that are conducted through the main line pass at least through the cable connecting portions, although only low ampere currents reach the taps. Therefore, it is necessary to secure sufficient capacity in the transmission line in order to minimize both the transmission loss and adverse effect on the characteristics of the electromagnetic waves.
The most effective measure would be to use a thick coaxial cylinder for the transmission line. This, however, is not a very practical measure because it takes up too much space in the distribution apparatus, leaving less space for installing other circuits. This measure also increases the number of parts, thereby increasing assembly time and cost.
DISCLOSURE OF THE INVENTION
The present invention provides for a distribution apparatus for being interposed in a transmission cable. The distribution apparatus includes a built-in mother board disposed in the approximate center of a case. The mother board includes a branch circuit for distributing as output signals high-frequency signals received at an input terminal of the mother board, and a current transmission circuit for allowing currents to be transmitted between the input terminal and an output terminal of the mother board. The input and output terminals of the mother board are electrically connected to cable connecting portions provided on one end or ends of the case by transmission lines each having a central conductor. The central conductor of each transmission line is disposed along a groove formed on the inner surface of the case without being in contact with the inner wall of the groove.
The distribution apparatus may have at least three cable connecting portions provided so that two cable connecting portions are selectable from the at least three cable connecting portions so as to be connected to the input and output terminals of the mother board.
Preferably, each of the grooves has a semi-circular cross section.
Also preferably, the central conductor of each transmission line is a conductive rod with a split tube on one end thereof. The split tube may have a connector pin inserted therein and being fixed, together with the connector pin, in the cable connecting portion.
In a preferred mode, the distribution apparatus includes a dielectric block interposed between each of the transmission lines and the corresponding groove. The dielectric block occupies part of the groove so as to be movable along the groove or to be fixed in a predetermined position in the groove.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded perspective view of a multi-tap distribution apparatus of an embodiment of the present invention.
FIG. 2 shows a plan view of the components of the multi-tap distribution apparatus.
FIG. 3 shows a circuit diagram of the components of the multi-tap distribution apparatus.
FIGS. 4A and 4B show the transmission Line of the embodiment.
FIG. 5 is a cross sectional view of the transmission line taken on line A--A of FIG. 4A.
FIG. 6 shows an alternate transmission line 6 of the embodiment.
FIG. 7 is a cros
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Brown Reuben
Faile Andrew I.
Maspro Denkoh Company, Ltd.
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