JPS628579Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a divider that equally divides the energy of a signal source, such as the received energy of an antenna, into two parts.

Conventional two-way dividers are, for example, FIG.
It was constructed as shown in Figure b.

The two-way divider shown in FIG. 1a includes a high frequency transformer 1 for energy distribution having a center tap,
Consisting of a correction capacitor 2 and a resistor 3 connected between the winding ends of the high-frequency transformer 1, the input signal voltage applied to the input terminal IN is equally divided into two by the high-frequency transformer 1, and the voltage of the high-frequency transformer 1 is divided into two equal parts. Connect one end of the winding to the first output terminal OUT ₁ and the other end of the winding to the second output terminal OUT ₂ to output distributed outputs from the first and second output terminals OUT ₁ and OUT ₂ , respectively. It has gained.

However, when using the two-way divider shown in FIG. 1a, the isolation between the output terminals is poor and only about -20 dB to -30 dB can be obtained. Therefore, the input terminal of the two-way divider shown in Figure 1a
When a received signal from an antenna is applied to IN, a television receiver is connected to the first and second output terminals OUT ₁ and OUT ₂ , respectively, and both television receivers are put into operation. When the selected channels of two television receivers are in a predetermined relationship, there is a problem that a striped pattern appears in the image of one television receiver.

Also, as shown in FIG. 1b, resistors 5, 6 and 7
Although the resistor divider constructed by connecting Δ is simple, the isolation between the first and second output terminals is worse than that of the two-way divider shown in Figure 1a. There were flaws. For this reason, the above-mentioned phenomenon of striped patterns appearing on the image of the television receiver becomes even more severe.

The present invention has been made in view of the above, and it is an object of the present invention to provide a two-way distributor which has a simple structure and eliminates the above-mentioned drawbacks.

The present invention will be explained below with reference to examples.

FIG. 2 is a circuit diagram of an embodiment of the present invention.

In FIG. 2, 10 indicates a signal source, and 11 indicates a signal source resistance. Also resistors 12 and 13
are the first and second output terminals OUT ₁ and OUT ₂
is the input resistance of the receiver or receiver, respectively.

In the 2-way divider of this embodiment, the primary winding W ₁ of the high frequency transformer 1' is directly connected to the input resistor 13, and the input resistor 13 is connected through the input resistors 14, 15, 16 and the primary winding. constitute a bridge circuit, and connect the connection point C between the resistor 14 and the primary winding _W1 of the high frequency transformer 1' to the input terminal IN to apply the signal voltage from the signal source 10. There is. On the other hand, the secondary winding of the high frequency transformer 1' is inserted between the connection point B between the resistors 15 and 16 and the ground, and the primary winding W ₁
and the number of turns of the secondary winding _W2 are set to be the same as that of the secondary winding W2, so that when the signal source 10 is connected to the input terminal IN, the signal voltage is in phase with the signal voltage applied to the connection point C by the high frequency transformer 1'. The configuration is such that signal voltages having the same amplitude and the same amplitude are applied to the connection point B. Furthermore, the connection point A between the resistor 14 and the resistance 16 is connected to the first output terminal OUT ₁ , and the first distributed output is obtained from the connection point A. Further, a second distributed output is obtained from the second output terminal _OUT2 .

Now, in one embodiment of the present invention described above, the signal source resistor 11, the input resistors 12 and 13, and the resistor 1
The resistance values of 4, 15 and 16 are R ₁₁ , R ₁₃ , R ₁₄ ,
When R ₁₅ and R ₁₆ , resistance value R ₁₁ = R ₁₂ = R ₁₃
Set = R ₁₄ = R ₁₅ = R ₁₆ = R.

Therefore, by connecting the signal source 10 to the input terminal IN, a signal voltage that is the same as and in phase with the signal voltage of the signal source 10 is applied to the connection point B. In addition, since each resistance value is set as described above, the bridge circuit is balanced and almost matched, and the energy of the signal source is equally distributed by the bridge circuit to the first distribution output and the second distribution output. The signal is outputted to the first output terminal OUT ₁ and the second output terminal OUT ₂ as a signal.

Therefore, as is clear from the above, the two-way divider of this embodiment uses a bridge for matching, and in this embodiment, ideally, if the loss of the high frequency transformer 1' is ignored, the distribution loss is It will be about 6dB.

In addition, if some kind of voltage flows backward from the device connected to the second output terminal OUT ₂ , the voltage is attenuated by the bridge circuit and reversed to the first output terminal by the high frequency transformer 1'. It appears in phases. The same applies from the first output terminal OUT ₂ side to the second output terminal OUT ₂ side, and the isolation between the output terminals is improved, and the isolation between the output terminals is -40 dB at 100 MHz. You can get more than that. Further, as shown in FIG. 1a, since the correction capacitor 2 is not included in the circuit, only the high frequency transformer 1' determines the frequency characteristics, so a high frequency band can be achieved. For example, by making the high frequency transformer 1' into a transformer configured by bifilar-wound the winding around a toroidal core,
The same characteristics can be obtained up to about 200MHz, and the two-way divider can be used for shortwave (HF) and very high frequency (VHF).
There is no need to distinguish between the two.

As explained above, according to the two-way divider of the present invention,
Output terminal isolation of approximately -40dB or more at 100MHz can be obtained, eliminating the conventional drawbacks.
It also has the effect of providing a wide band.

[Brief explanation of the drawing]

Figures 1a and 1b are circuit diagrams of a conventional two-way divider.
FIG. 2 is a circuit diagram of an embodiment of the present invention. 1'... High frequency transformer, 10... Signal source, 1
1...Signal source resistance, 12 and 13...Input resistance, 14-16...Resistance, W ₁ ...Primary winding, W ₂
...Secondary winding.

Claims (1)

[Scope of utility model registration request] 2 divides the energy from the signal source equally into two
The divider includes a first resistor connected in series with an input resistor of a device connected to a second output terminal via a primary winding of a high frequency transformer, and a second resistor and the first resistor connected in series. and a third resistor connected to the resistor are connected in series to constitute a bridge circuit by the input resistor, the first resistor, the second resistor, and the third resistor,
The input signal voltage from the signal source is applied to the connection point between the primary winding and the first resistor, and the output of the high frequency transformer is applied to the connection point between the second resistor and the third resistor. A signal voltage having the same phase and amplitude as the input signal voltage is applied by voltage, and the connection point between the first resistor and the third resistor serves as a first output terminal. 2 distributor.