JPS6010109Y2 - Signal branching and combining device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a signal branching/synthesizing device used, for example, for parallel synthesis of power amplifiers from HF band to VHF band.
Regarding the branching and joining command device.

Generally, in high-power transistor transmitters such as broadcasting equipment, it is difficult to realize high-power transistors, and parallel synthesis of power amplifiers is adopted to provide a redundant system of power amplifiers. Frequently used.

Traditionally, & old couplers, Wilkinson type branch synthesizers, etc. have been commonly used for parallel synthesis of power amplifiers in the frequency band above VHFHF, but since the wavelength is longer in the frequency band below VHFHF, the above It is becoming extremely difficult to realize such a branch/combiner.

For this reason, a 180 degree hybrid branch combiner as shown in FIG. 1 is often used as a parallel combiner for power amplifiers in frequency bands near the HF band.

That is, the signal applied to the unbalanced terminal 1 is divided into two parts by the balanced/unbalanced conversion transformer 2 between the balanced terminals 3, 4 and the ground, each with a phase difference of 180 degrees.

The in-phase component and unbalanced amplitude component between the balanced terminals 3 and 4 are detected by the in-phase component detection transformer 5 at the in-phase terminal 6.

The component appearing at this common mode terminal 6 is the resistor 7 for absorbing the common mode component.
be absorbed into.

Conversely, if signals with a phase difference of 180 degrees are applied between the balanced terminals 3 and 4 and the ground, they are synthesized and can be taken out between the unbalanced terminal 1 and the ground.

In order for this 180 degree hybrid branching device to operate as described above, terminal 1. 3. 4.6 and ground must have a certain impedance relationship.

That is, if the impedance between the unbalanced terminal 1 and the ground is R, the impedance between the balanced terminals 3 and 4 and the ground is R/
2, and the impedance between common-mode terminal 6 and ground is R/
4, so it cannot be used, for example, for parallel synthetic leather in a power amplifier in a system that is generally unified to a 50Ω system.

Further, three of these 180 degree hybrid branching weapons are combined to form a four-branching weapon as shown in FIG.

If the impedance between the total unbalanced terminal 1 and the ground is 500, then the impedance between the balanced terminals 3 and 4, which are branch terminals, and the ground between the balanced terminals 3 and 4 and the ground is 1/4 of 12.5Ω, respectively. It became necessary to create a power amplifier with a high input/output impedance, which required special cables and connectors to connect this power amplifier and the four-branch signal generator, and also had the drawback that maintenance and measurement were extremely complicated. .

The present invention eliminates the above-mentioned drawbacks and provides a 4-branch combiner signal branching and combining device that uses multiple 180-degree hybrid branch combiners to make the impedance of the combining terminal and the four branch terminals the same value. The purpose is to

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 3 shows an embodiment of the present invention.

That is, three 180 degree hybrid branch combination devices as shown in FIG.
The unbalanced terminals 16 and 18 of the second 180 degree hybrid branch combiner 1 and the unbalanced terminal 18 of the third 180 degree hybrid branch combiner 17 are respectively connected to the balanced terminals 13 and 14 of the 180 degree hybrid branch combiner 11. This is a four-branch combining device in which the balanced terminals 19, 20, 21, 22 of the second and third 180-degree hybrid branch combiners 15, 17 are used as branch terminals.

That is, an unbalanced terminal 24 is connected to one end of the first 180-degree hybrid branch combiner or balance/unbalance conversion transformer 23, and a balanced terminal 13.14 is connected to the other end. It is grounded via a negative phase component absorbing resistor 25.

Therefore, the balanced terminals 13 and 14 are connected through a negative phase component absorbing resistor 25.

A common mode detection transformer 2 is connected between the balanced terminals 13 and 14.
6 is connected, and an in-phase terminal 12 is connected to the connection point of the series-connected coils of this transformer 26, and this in-phase terminal 12 is used as a composite terminal.

Similarly, the second 180 degree hybrid branch combiner 1
5 is an unbalanced terminal 1 at both ends of the balanced unbalanced conversion transformer 27.
6 and balanced terminal 19.20 are connected, and this balanced terminal 1
A common mode detection transformer 28 is connected to 9.20.

A common-mode terminal 29 is connected to the common-mode detection transformer 28, and the common-mode terminal 29 is grounded via a common-mode component absorbing resistor 30.

Similarly, the third 180-degree hybrid branch is connected to the unbalanced terminals 1 at both ends of the balanced-unbalanced conversion transformer 31.
8 and balanced terminals 21 and 22 are connected, and this balanced terminal 2
1.22 is connected to the common mode detection transformer 32.

A common-mode terminal 33 is connected to the common-mode detection transformer 32, and the common-mode terminal 33 is grounded via a common-mode component absorbing resistor 34.

Thus, the unbalanced terminal 16 of the second 180 degree hybrid combiner 15 is connected to the balanced terminal 13 of the first 180 degree hybrid combiner 11, and the first 180 degree hybrid combiner 11 is connected to the unbalanced terminal 16 of the second 180 degree hybrid combiner 15. The unbalanced terminal 18 of the third 180-degree hybrid branch combiner 11 is connected to the balanced terminal 14 of the third 180-degree hybrid combiner 11 .

Each of the balanced/unbalanced conversion transformers 23, 27.31 and in-phase detection transformers 26, 28.32 may be transmission line type transformers such as coaxial cables or pair cables having a predetermined impedance, and furthermore, coaxial cables or pair cables may be connected in parallel. Alternatively, they may be connected in series.

Further, these coaxial cables or pair cables may be left in the air, passed through the core, or wound around the core.

Now, the balanced terminals 19, 20 and 21.22 which are branch terminals
When the impedance connected to R1 is tossed, the common-mode component absorbing resistors 30 and 34 connected between the common-mode terminals 29 and 33 of the second and third 180-degree hybrid branch combiner ■ and 11 and the ground become R1. /2, unbalanced terminals 16 and 1
The impedance when looking at the branch terminal side from 8 is 2R.
Becomes 1.

Further, these unbalanced terminals 16 and 18 are connected to the first terminals, respectively.
Balanced terminals 13, 14 of 80 degree hybrid branching device
Therefore, the resistor 25 for absorbing the negative phase component connected to the unbalanced terminal 24 becomes 4R', and the in-phase terminal 1 of the first 180-degree hybrid branch combination, which becomes the composite terminal,
The impedance when looking at the branch terminal side from 2 is R1.

Therefore, in this four-branch combining device, a signal applied to the in-phase terminal 12, which is a composite terminal, is first applied to the balanced terminal 13.
14 are in-phase branched and are added to the unbalanced terminals 16.18 of the second and third 180-degree hybrid branch combiner 15.17, so that the balanced terminals 19.20 and 21.22 which are branch terminals Therefore, it is possible to realize a four-branch combining device in which the composite terminal and the branch terminal have equal impedance.

As described above, according to the present invention, it is possible to provide a signal branching and combining device in which the impedance of the combining terminal and the branching terminal are equal in the band from the band to the VHF band, and the design, maintenance, and measurement of power amplifiers, etc. that require parallel operation. can be facilitated.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing an example of a general 180-degree hybrid combiner, Figure 2 is a circuit diagram showing a conventional 4-branch combiner, and Figure 3 is a circuit diagram showing an embodiment of the present invention. be. 11.15,1U...180 degree hybrid branching device, 12,29,33...In-phase terminal, 1
3゜14, 19.20.21.22... Balanced terminal, 23.27, 31... Balanced unbalanced conversion transformer, 16, 18.24... Unbalanced terminal,
25...Resistance for absorbing negative phase component, 26.28.3
2...In-phase component detection transformer, 30.34...
...Resistance for absorbing common mode components.

Claims (1)

[Scope of utility model registration request] It consists of three 180 degree hybrid branch combiners with an unbalanced terminal, an in-phase terminal and two balanced terminals, the first one
The second terminal is attached to both balanced terminals of the 80 degree hybrid branch combiner. Connect the unbalanced terminal of the third 180-degree hybrid branch combiner, and connect the unbalanced terminal of the first hybrid branch combiner and each in-phase terminal of the second and third 180-degree hybrid combiner to a resistor. The in-phase terminal of the first hybrid branch combiner is used as a combination terminal, and the second and third
A signal branching and combining device that uses the balanced terminal of an 80 degree hybrid branching and combining device as a distribution terminal.