KR100285087B1 - High frequency power distribution and synthesis method - Google Patents

Abstract

The present invention is composed of two circuit constants having a relation of conjugation by adjusting the length of the feeder having a generalized impedance without using a λ / 4 transformer having a specific impedance when there are a large number of branches of high frequency power distribution. The present invention relates to a high frequency power distribution and synthesis method that realizes high frequency power distribution and impedance matching by connecting them in parallel.

In order to implement this, the high frequency power distribution and synthesis method of the present invention may have a circuit constant value of a constant impedance (Z _o / n), at least, when the number of branch frequencies 2n of the high frequency power distribution and synthesis is four or more. Synthesizing the number of branches by n each, connecting a standardized feed line having a constant impedance value and a predetermined length to the n synthesized branch points, and the impedance and admittance of the feed line connected to the branch point are conjugated to each other. Converting the lengths of the feed lines so as to be related, and connecting two feed lines connected to different branch points in parallel so as to cancel an imaginary part of impedance and admittance of the feed lines. .

Description

High frequency power distribution and synthesis method

The present invention relates to a high frequency power distribution and synthesis method, and more particularly, in the case where there are a large number of branches of the high frequency power distribution, it is easy to use a feeder having a generalized impedance without using a λ / 4 transformer having a specific impedance. A high frequency power distribution and synthesis method for realizing power distribution and impedance matching.

With the recent development of semiconductor technology, in the field of high frequency power amplification, it is rapidly changing from a conventional amplifier using a vacuum tube to an amplifier using a semiconductor. However, due to various technical limitations, the high frequency output that can be obtained from one semiconductor device is limited to several hundred watts, and even when the amplifier is modularized in combination, the output per module may reach 1 KW. In this case, a technique employed to overcome technical limitations is the synthesis of high frequency output. This will be described below with reference to the block diagram shown in FIG. 1.

Referring to the configuration of a large output semiconductor amplifier using a high frequency power distribution and synthesizing apparatus, the driving power of the amplifier is applied to the input of the high frequency power divider 10 in the first step, and the power is divided and output from the divider 10 as n. . The output n signals are applied to the inputs of the n individual amplifiers 20_n, and the signals are amplified to be n outputs. These n outputs are synthesized in the power synthesizer 30 to become the final output. These distributors 10 and synthesizers 30 are identical circuits and operate reversibly as distributors and synthesizers. Thus use is also reversible.

Applications include various high-power high-frequency amplifiers, high-power radio transmitters, broadcast transmitters, power dividers for array antennas for obtaining high gain or specific radiation patterns, and the like.

Then, a high frequency power distribution and synthesis method according to the prior art will be described with reference to FIG.

Conventional matching technology is the characteristic impedance Z ₀ and may match the characteristic impedance Z ₀ from the signal source is split into p when the load power of the p dog byeongyeol associated impedance Z ₀ / Z ₀ p a. Mainly used for this purpose is a λ / 4 modifier.

That is, as illustrated in FIG. 1, the impedance of point a in which the branch p p Z ₀ are connected in parallel becomes Z ₀ / p. If Z ₀ / p is substituted into Z ₁ and Z ₀ is substituted into Z ₂ in the equation Z ₁ × Z ₂ = Z ² , which represents the impedance transformation of the λ / 4 transformer, the impedance of Z is Z ₀ / Becomes Impedance is Z ₀ / And the impedance of the point length b is passed through the λ / 4 of a transformer is a standard impedance of Z ₀ is connected to form the outside and the matching.

However, in the conventional high frequency power distribution and synthesis method configured as described above, when a λ / 4 transformer having a specific impedance and a specific length is used, when the number of branches p is a large number, the number of branches p is mutually different. A large proportion of the match is required, so we need a λ / 4 transformer with accurate values. In some cases, when the λ / 4 transformer is configured by using multistage matching or a 3 dB coupler or balanced bridge circuit, the number of branches p is limited to two branches p, When there are a large number of multi-stage conversion, the feeder having a different value of impedance according to the branch number (p), respectively, there is a problem that causes the increase in cost and technical difficulties.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to use a feeder having a generalized impedance without using a λ / 4 transformer having a specific impedance when a large number of high frequency power distribution branches exist. The present invention relates to a high frequency power distribution and synthesis method that realizes the necessary high frequency power distribution and impedance matching by constructing two circuit constants having a relation of conjugate numbers by adjusting the length and connecting them in parallel.

1 is a block diagram of a typical high frequency power distribution / synthesis device

2 is an explanatory diagram for explaining a high frequency power distribution and synthesis method according to the prior art;

3 is an explanatory diagram for explaining a high frequency power distribution and synthesis method according to the present invention;

Explanation of symbols on the main parts of the drawings

10: high frequency power divider 20_1-20_n: amplifier

30: high frequency power synthesizer

In order to achieve the above object, the high frequency power distribution and synthesis method of the present invention,

At least, synthesizing n branches each so as to have a circuit constant value of a constant impedance (Z _o / n) when the number of branch frequencies 2n of high frequency power distribution and synthesis is four or more;

Connecting standardized feed lines having a constant impedance value and a predetermined length to the n-synthesized branch points;

Converting a length of the feed line such that the impedance and admittance of the feed line connected to the branch point are conjugated to each other;

And parallel connection of two feed lines connected to different branch points to offset the imaginary part of the impedance and admittance of the feed line.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In addition, in all the drawings for demonstrating an embodiment, the thing with the same function uses the same code | symbol, and the repeated description is abbreviate | omitted.

3 is an explanatory diagram for explaining a high frequency power distribution and synthesis method according to the present invention.

Referring to the drawings, q branch terminals are synthesized by combining the high frequency power or the number of branches of the divider with an even number (2 × q) so as to have a circuit constant of 2 Z ₀ / q. Then, connect the feed lines of characteristic impedance Z ₀ and length L1 and L2 to each synthesis point so that the impedance converted by the feed line length is R + jX and R-jX, or the admittance is G + jB and G-jB. The two feeder ends are connected in parallel with each other so as to be conjugated with each other. At this time, if the impedance of the feed line is Zp and the admittance is Yp, the imaginary number cancels as shown in the following result and only the real number remains.

Yp = (G + jB) + (G-jB) = 2G

When a load with impedance Z is connected to a feed line with a characteristic impedance of Z ₀ and a length of ℓ, the impedance seen at the end of the feed line Zl This Zl Is as follows.

Of Equation 2 Zl To make the value conjugate Z = Z _o / q ,

L1 = (mλ / 2) + δ , l2 = (nλ / 2) -δ If you substitute common sense,

Same as

In the same way as above,

The combined impedance Zp of the two circuits connected in parallel is as follows.

In particular, substituting Zp = Z _o to find the δ of Zp = Zo,

2 / q + (2 / q) tan ² (2πδ / λ) = 1 / q ² + tan ² (2πδ / λ)

If you solve this equation and get δ value, if q = 2 tan ² (2πδ / λ) As the size of infinity δ = λ / 4 It is like connecting two loads in parallel and connecting them in parallel via a λ / 4 transformer. If q is 2, that is, 4 branches, it is necessary to bundle two branches and connect two loads with impedance Z _o / 2 in parallel with two λ / 4 transformers with impedance Z _o . Indicates that four branches of power can be synthesized or distributed without using a feeder with an impedance of.

In general, substituting q = 3 into the equation as q> 2,

If you substitute q = 4,

If you substitute q = 5,

If you substitute q = 6,

Becomes In this case, the power ratio distributed is the same in the two branches of the conjugated relationship and the phases are conjugated to each other, but the phase is adjusted during the passage of feed lines of different lengths, so It becomes the same power in the same phase which is divided into each.

As described above, according to the high frequency power distribution and synthesis method according to the present invention, when four or more branches of the high frequency power distribution have a standardized impedance (eg, 50 Ω) without using a λ / 4 transformer having a specific impedance By using only the feed line having a feed line to adjust the length of the feed line to have two impedances of conjugated relationship with each other, by connecting the two circuits in parallel to offset the imaginary number to facilitate the power distribution and impedance matching. Therefore, there is an advantage in the case of producing a high frequency power divider or synthesizer using the present technology does not require a feed line of a specific impedance that is not generalized for the λ / 4 transformer.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to various modifications, changes, additions, etc. within the spirit and scope of the present invention, these modifications and changes should be seen as belonging to the following claims. something to do.

Claims (1)

At least, synthesizing n branches each so as to have a circuit constant value of a constant impedance (Z _o / n) when the number of branch frequencies 2n of high frequency power distribution and synthesis is four or more; Connecting standardized feed lines having a constant impedance value and a predetermined length to the n-synthesized branch points; Converting a length of the feed line such that the impedance and admittance of the feed line connected to the branch point are conjugated to each other; And parallelly connecting two feed lines connected to different branch points in order to cancel an imaginary part of impedance and admittance of the feed line.