JPH0364221A - High frequency signal inducing line - Google Patents

Abstract

PURPOSE:To obtain the sure branch output without taking out an inducing electric wire by using a balanced line to a transmission line and connecting an inducing line part to the balanced line. CONSTITUTION:A balanced line consisting of a pair of conductors 1 and 1' and an insulator forms an electric transmission line part. The induced lines 3 and 3' consisting of the conductors are set in parallel to the electric transmission line part. At one of both ends of each of lines 3 and 3', a matching resistance Zr is taken out. At the other end, the branch output is taken out of a coaxial cable Cx via a transformer T which transforms the balanced input into the non-balanced output. In such a constitution of a branch line, the electromagnetic field connection is caused to the electronic transmission line part at only both parts 3 and 3' and with no connection at all to the cable Cx. Thus the stable branch output is always obtained with no influence of the cable Cx. As a result, the new branch output is easily obtained at any position of a transmission line and with no interruption of the transmission.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to branching of high frequency transmission lines.

<Prior Art> Regarding branching of a transmission line using only a cable, there is a patent No. 60-042564 using a coaxial cable. In order to obtain a branched output, it is necessary to remove the outer sheath for protecting the cable, and to connect the induced electric wire placed inside the outer conductor with the coaxial cable for extraction, which requires very troublesome work. .

Technical Problems> The present invention is an improvement that eliminates the need for the work of taking out the induced electric wire at all.

<Technical Means> According to the present invention, a reliable branch output can be obtained simply by using a balanced line as a transmission line and coupling an induction line part to this line.

Next, FIG. 1 is a block diagram showing the entire configuration.

S is a signal source; 1, 1°, 2. ZR on the balanced line of
The signal is transmitted toward the terminating resistor, and three branch points are shown. FIG. 2 is a perspective view showing only the branched portion, and FIG. 3 is a sectional view thereof.

1, lo is a pair of conductors, 2 is an insulator, which together constitute the transmission line section, 3.3° is an induced line by the conductor, which is arranged parallel to the transmission line section, and one end is a matching Zr line. resistance,
The remaining end is a converter T that converts balanced input to unbalanced output.
A branch output is taken out from the coaxial cable Cx through the cable. This effect occurs because the electromagnetic coupling with the transmission line in this branch line is only at the 3.3° induced line, and there is no coupling at all with the coaxial cable at Cx. A stable branch output can always be obtained.

In addition, this amount of branch coupling induction can be increased or decreased by the separation between the transmission line and the induced line part and the length SL of the induced line part of 3.3 degrees, but if the distance is too close, the impedance of the transmission line becomes uneven, so it is usually The distance is constant and the length of the SL is variable. At this time, if SL is doubled, it will increase by about 5 dB,
If it is multiplied by 1/2, it will decrease by about 5 dB. This situation can be seen in the fourth
As shown in the figure.

The following Figure 5 is an example showing the directionality of the bonding direction, and a reverse bond is equivalent to replacing ZR and S in Figure 2, and a positive bond is the same as shown in Figure 2. It's like this.

Actual example Next is an example in which the device was used for a home bath at home, and each member is designated by the same number.

Fig. 6 is an overall configuration diagram of this example, and Fig. 7 shows how the transmission line and the induction line section are installed inside the building interior material 7 (wood, resin, metal, etc.). When it is made of metal, it is surrounded by an insulator to maintain a certain distance so as not to affect each component, but this is electromagnetically isolated from the external space due to the shielding effect of 7, making it even more functional. and wood, resin, etc. have compatibility with architectural interiors.

Next, the configuration example shown in FIG. 8 takes advantage of the directivity of the coupling shown in FIG. 5, which is a major feature of this induction line, to avoid unnecessary interference between devices.

Specifically, systems such as TV, R1, PC, C
Systems such as GTV are non-coupling and reverse coupling. Further, the amplifier A and converter C in the figure not only adjust the level of broadcast waves to be transmitted, but also have the role of isolating various transmission signals from being radiated from the antenna.

<Effects> With this configuration, a new branch output can be easily obtained from any position on the transmission path without interrupting transmission, and the directivity can be used to achieve even higher density transmission. can do.

Such characteristics can be widely applied to LAN CATV and the like.

[Brief explanation of drawings]

Figure 1 is a configuration diagram showing the basics of this branching method.
The figure is a perspective view showing the branched portion, and FIG. 3 is a sectional view thereof. FIG. 4 shows the increase and decrease in the induced output due to changes in the length SL of the induced line portion, and FIG. 5 shows the coupling loss due to the positive coupling direction and the return loss due to the reverse coupling direction. FIG. 6 is a perspective view showing the structure of the branch portion of this embodiment, FIG. 7 is a sectional view thereof, and further, FIG. 8 is a configuration diagram showing the overall structure of this embodiment. 11°: Balanced line conductor pair 2: Insulator 33'
: Inductive line conductor pair 4 : Coaxial cable center conductor 5 : Coaxial cable insulator 6 : Coaxial cable outer conductor 7 : External case S : Signal source ZR : Termination resistor T : Balanced-unbalanced converter Cx; Coaxial cable Zr : Matching Resistance SL: Length of induced line ANT: Broadcast radio wave receiving antenna A nib star C: BS converter position (
T): Telephone line drop-in terminal device: Telephone CC: Surveillance camera CCTV, surveillance monitor TV PC (H): Personal computer host PC (T
): Personal computer terminal TV, TV receiver R, radio receiver MD, modem

Claims (1)

[Claims] A high-frequency signal is generated by connecting an induced line consisting of a pair of conductors in parallel to a balanced line consisting of a pair of parallel electric wires, connecting a matching resistor to one end, and connecting a converter (unbalanced rather than balanced) to the remaining end. induced line.