JPS63246003A - High frequency power distributer - Google Patents

Abstract

PURPOSE:To adjust at least one level of a distributed output by providing an output adjusting means whose maximum value is a sufficiently larger than a characteristic impedance of each input/output line to each output terminal of the input/output line side. CONSTITUTION:A circuit pattern and a ground plate 52 are mounted to each face of a dielectric hoard 1 and the circuit pattern is provided with input/output lines 60, 70, 71 and high impedance transmission lines 62, 63 provided between a branch point 61 and the lines 70, 71 and variable resistors 3, 4 as output adjusting means with proper resistance are provided respectively to the output terminal of the lines 70, 71 respectively. Then the output ratio of the distributed output is adjusted independently by using one or two of the resistors 3, 4. In setting each resistance to a maximum value, the in-phase power divided equally from terminals 81, 82 is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high frequency power divider, and more particularly to a high frequency power divider equipped with an isolation resistor on the distribution output side.

[Conventional technology]

2. Description of the Related Art Conventionally, a two-distribution type divider formed by a planar microwave circuit has been relatively often used as a divider that distributes or combines high-frequency power depending on the application.

An example of the circuit is shown in FIGS. 4(1) and 4(2).

In FIG. 4(2), 50 indicates a dielectric substrate.

On one surface of this dielectric substrate 50, a predetermined circuit pattern for power distribution is formed as shown. A grounding plate 52 is uniformly attached to the other surface of the dielectric substrate 50.

The circuit pattern includes a single input/output line 60 in the input stage, two input/output lines 70 and 71 in the output stage, and each of the above-mentioned input/output lines in the output stage branched from a branch point 61 via the input/output line 60 in the input stage. It is formed by two high impedance transmission lines 62 and 63 provided between the input and output lines 70 and 71. An isolation resistor 64 is connected between the output sides of each of the high impedance transmission lines 62 and 63.

The input/output line 60 of the input stage and the input/output line 70 of the output stage.
Each of 71 has an impedance value of Z, (
Ω]. In addition, the high impedance transmission lines 62 and 63 are all 4 lines/Z. It is set to [Ω]. Furthermore, this high impedance transmission line 62.63
The length l of each of is g=(2n+1)・λ9/4 where n=0.1 2. ....lambda.9: A dimension determined based on the wavelength of the frequency used.

Further, 80 indicates an input/output terminal on the input side, and 81° and 82 indicate input/output terminals on the output side.

In the conventional example shown in Fig. 4 (2), the fourth
It is represented by the equivalent circuit shown in FIG.
82, and the phase difference between the output terminals 81 and 82 is 00. Conversely, when power with the same level and a phase difference of 0'' is input to the other input/output terminals 81 and 82, the combined power appears on the one input/output terminal 80. In this case, the isolation Resistor 6 for
4, since the double forces are in phase, no potential difference occurs;
Therefore no current flows. Therefore, this power divider
It can also function as a power combiner.

Furthermore, since the circuit shown in FIG. 5(1) is in an ideal state, part of the input from the input/output terminal 81 (or 82) appears at one input/output terminal 80, and the rest appears at one input/output terminal 80. All are absorbed by the resistor R and input/output terminal 82 (or 81)
It is no longer possible to appear.

[Problem that the invention seeks to solve]

However, in such a conventional example, the distributed output is outputted from the other input/output terminals 81 and 82 at a fixed division ratio as half the power of the input. Even if it becomes necessary to adjust the input level of the power amplifier in order to set the output level to a constant value, there is an inconvenience in that the output level of each distribution output cannot be adjusted accordingly. .

[Purpose of the invention]

An object of the present invention is to provide a high frequency power divider which can improve the disadvantages of the conventional example and can appropriately adjust the output level of at least one of the two divided outputs. shall be.

[Means for solving problems]

Therefore, in the present invention, input/output lines formed with the same impedance value are provided on each of a single input side and two output sides branched from the single input side, and the input/output line is connected from the one input/output line through a branch point to the other side. A high-impedance transmission line is provided between each of the input and output lines, and this high-impedance transmission line is formed by a quarter-wavelength line. In a high-frequency power divider in which an isolation resistor is connected to the output end of the other two input/output lines, the maximum value thereof is sufficient for the characteristic impedance of each input/output line. The above object is achieved by adopting a configuration in which an output adjustment means having a large value of impedance is provided.

[First Embodiment of the Invention] A first embodiment of the invention will be described below with reference to FIGS. 1 and 2. Here, the same reference numerals are used for the same clearing members as in FIG. 5 described above.

In FIG. 1, l indicates a dielectric substrate. On one surface of this dielectric substrate 1, a predetermined circuit pattern for power distribution is formed as shown. A grounding plate 52 is uniformly attached to the other surface of the dielectric substrate 1.

Similar to the conventional example described above, the circuit pattern includes an input/output line 60 of the input stage, each input/output cuff 0°71 of the output stage, and a circuit branched from the branch point 61 via the input/output line 60 and connected to each of the above-mentioned input/output lines of the output stage. It is formed by two high impedance transmission lines 62 and 63 provided between the input and output lines 70 and 71. This high impedance transmission line 62.63
An isolation resistor 64 is connected between the output sides of the two.

Variable resistors 3.4 as output adjustment means each having an appropriate size are provided at the output side ends of the input/output lines 70, 71. The variable resistors 3.4 each have one end connected to the output end of the input/output line 70°71,
The other end is connected to a ground plate 52. Reference numeral 5 indicates an electrode portion connected to the ground plate 52. As the variable resistor 3.4, one whose maximum resistance value Rwax is sufficiently higher than the characteristic impedance of the input/output line 70.71 is used. FIG. 2 shows a basic equivalent circuit in this case.

The other configurations are the same as the conventional example described above.

In this first embodiment, when the resistance value of the variable resistors 3 and 4 is maximum, it has almost no effect on the input/output line 70.71, and the power distribution function is performed without the variable resistor 3.4. It is equivalent to

Therefore, equally divided power having the same phase is outputted from the input/output terminals 81 and 82.

On the other hand, when the variable resistance value of the variable resistor 3.4 is decreased from its maximum value, its influence appears on the input/output lines 60, 70.71, and the reflected power increases. Therefore, from one input/output line 60 to the other input/output line 70
Or, the transmission coefficient becomes smaller until reaching 71.

Here, the generated reflected power is transmitted to the other input/output line 70.
Since the output terminals 71 are insulated from each other, the output terminals 71 have no influence on the outputs of the other terminal. Therefore, it is possible to independently adjust the output ratio of the distributed output using only one or both of the variable resistors 3.4.

[Second example] Next, a second embodiment will be described based on FIG.

The embodiment shown in FIG. 2 uses a variable capacitance element 5.6 as shown in the figure, whereas the first embodiment described above uses a variable resistor 3.4 as an output adjustment means. It has characteristics. The other configurations are the same as those of the first embodiment described above.

Even in this case, the output distribution ratio can be effectively adjusted as in the first embodiment described above.

In addition, in each of the above embodiments, the other input/output line 70.71
Although an example is shown in which both are equipped with the output adjustment means, either one may be equipped with the output adjustment means.

〔Effect of the invention〕

Since the present invention is configured and functions as described above, it is possible to provide an unprecedented high-frequency power divider that can adjust the output distribution ratio very easily.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the first embodiment of the present invention, Fig. 2 is an equivalent circuit diagram of Fig. 1, Fig. 3 is an equivalent circuit diagram of the second embodiment, Fig. 4 (1) (2) are explanatory diagrams each showing a conventional example. 1... Dielectric substrate, 3.4... Variable resistor as output adjustment means, 5.6... Variable capacitance element as output adjustment means, 52... ...Earth plate, 60...One input/output line, 61...
・Branch point, 62.63... High impedance transmission line, 64... Isolation resistor, 7
0.71...The other input/output line. Patent applicant Tokyo Keiki Co., Ltd. Figure 2 Figure 3 Figure 4 Figure 4

Claims (1)

[Claims] (1) A single input side and two output sides branched from the single input side are each provided with an input/output line formed with the same impedance value, and each input/output line is connected from the one input/output line through a branch point to the other side. A high impedance transmission line is provided between the input and output lines, and this high impedance transmission line is formed by a quarter wavelength line, and an isolator is provided between each of the high impedance transmission lines on the other input and output line side. In a high-frequency power divider which is formed by connecting resistors for rationing, each output end on the other two input/output lines has a maximum value that is sufficiently large with respect to the characteristic impedance of each input/output line. A high frequency power divider characterized in that it is equipped with an output adjustment means having an impedance of.