JPH0129871Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Purpose of the Invention" (Field of Industrial Application) The present invention relates to a divider that divides the energy of a high-frequency signal into equal parts, and particularly relates to a divider used for joint reception of satellite broadcasting.

(Prior Art) A basic system for joint reception of satellite broadcasting has a configuration as shown in FIG. In the figure, 41 is a low noise, blockdown, converter (LNB).
) or converter, 42 is a distributor, 4
3,44 is Chuyuna. The distributor 42 has a configuration as shown in FIG. In the figure, IN is connected to the input microstrip line at the signal input end.

OUT1 and OUT2 are connected to the output side microstrip line at the signal output end.

Reference numerals 31 and 32 denote distribution paths, which are composed of microstrip lines of 1/4 wavelength at the center frequency of the band used. R is a resistor for preventing mutual interference between outputs.

(Problem to be solved by the invention) In the above configuration, the power for the LNB 41 is supplied from the tuners 43 and 44 in a manner superimposed on the signal path, but if multiple tuners are connected In this case, there is a danger that a tuner with a high DC potential will drive other tuners. Also, if you terminate or short the unused distributor output, the power from the tuner will become short or close to short.
There was a problem where all the joint reception functions stopped.

The present invention has been made in view of the above points, and its purpose is to provide a distributor that can connect a plurality of tuners, each having a DC power supply superimposed on a signal path for driving an LNB. It's about doing.

"Structure of the invention" (Means for solving the problem) The distributor according to the invention has an input end and a plurality of output ends, and has a plurality of couplings inserted in series on the output end side. A capacitor and a plurality of diodes are connected in parallel to the coupling capacitor via a high-frequency cutoff means, and the plurality of diodes are connected to each other in the same direction.

(Function) Therefore, when each tuner is connected to a plurality of output terminals, power is supplied to the LNB from the tuner with the highest voltage among the tuners through the diode. At this time, other diodes are cut off. Therefore, since each tuner, that is, each output terminal is electrically insulated from each other, the tuner with the highest voltage will not drive the other tuners, and the unused output terminals will be isolated from each other. There is no problem even if you terminate it with a dummy load or shoot it by mistake.

(Example) A first embodiment of the present invention is shown in FIG.

In FIG. 1, the same numbers as in the conventional example shown in FIG. 3 represent the same components, and their explanations will be omitted. 1 and 2 are coupling capacitors that pass the distributed signal, 3 and 4 are diodes that supply DC power from the tuner to the LNB, and 5
8 are capacitors, and 9 to 12 are microstrip lines each having a length of 1/4 wavelength at the center frequency of the band used.

The operation will be explained below.

When tuners are connected to the signal output terminals OUT1 and OUT2, the tuner with the higher power supply voltage is connected to the signal input terminal through diode 4 or 3.
Power is supplied to the LNB connected to IN.
For example, if the power supply voltage of the tuner connected to the signal output terminal OUT1 is higher, the diode 4 is turned on and the diode 3 is turned off. Therefore, the signal output terminal OUT1 and the signal output terminal
Since OUT2 is DC isolated, even if the tuner is not connected to the signal output terminal OUT2,
Even if it were shot, no problem would occur because diode 3 is off.

Also, when looking from the signal input terminal IN, diode 3,
The connection point of the cathode of 4 is shot at high frequency by the microstrip line 10 and capacitor 7, and the microstrip line 11 and capacitor 6, respectively, and the connection point of the anode of diodes 3 and 4 seen from the signal output terminals OUT1 and OUT2. The points are radio frequency shot by microstrip line 9 and capacitor 8, and microstrip line 12 and capacitor 5, respectively.

Therefore, the distribution signal is not transmitted to the output terminals OUT1 and OUT2 through these paths. Regarding the distribution signal, the distribution path 31 is routed from the signal input terminal IN.
and the signal output terminal OUT1 through the coupling capacitor 1.
The signals are transmitted to the signal output terminal OUT2 through the distribution path 32 and the coupling capacitor 2, respectively.

Next, a second embodiment of the present invention is shown in FIG. In the second embodiment, the microstrip lines 9 to 12 of the first embodiment are eliminated, and diodes 4 and 3 are connected from both ends of the coupling capacitors 1 and 2 via coils 22 and 23 and coils 20 and 21, respectively.
is connected. The operation of the second embodiment is the same as that of the first embodiment, so a description thereof will be omitted.

"Effect of the invention" According to the distributor according to the invention, it is possible to perform joint reception in which power is superimposed on the signal path without any loss in distribution characteristics, and as a result, the power from one tuner can be By simply driving the car, there is no danger of driving other cars. Further, even if an unused distributor output terminal is accidentally shot, other tuners will not be affected at all. Furthermore, since the unused output end of the distributor can be terminated with a dummy load, it is possible to obtain good performance in terms of distribution characteristics, isolation, VSWR, etc. of the distributor.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a distributor according to the present invention, and FIG. 2 is a configuration diagram showing a second embodiment of a distributor according to the present invention.
FIG. 3 is a block diagram showing a conventional distributor, and FIG. 4 is a block diagram showing a communal reception system according to the present invention. 1, 2...Coupling capacitor, 3, 4...Diode, 5-8...Capacitor, 9-12...Microstrip line.

Claims (1)

[Scope of utility model registration request] In a distributor having an input end and a plurality of output ends, a plurality of coupling capacitors are inserted in series on the output end side, and a plurality of diodes are connected in parallel with the coupling capacitor via a high frequency blocking means. A distributor characterized in that the plurality of diodes are provided and connected to each other in the same direction.