JPH0659003B2 - Microwave power distributor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a power distributor on a transmission line mainly used in microwaves.

[Conventional technology]

The following power splitters branch the microwaves on the transmission line as needed. That is, Fig. 6 shows The
1977 IEEE MTT-S Alternativeal M
It is a block diagram which shows the electric power 4 distributor shown by icrowave Symposium Digest, for example, in the figure, 1 is a flat ground conductor, 2 is a dielectric substrate laminated on the ground conductor 1, 3
Is a strip conductor provided on the dielectric substrate 2, and 4 is a microstrip line composed of the ground conductor 1, the dielectric substrate 2, and the strip conductor 3.

The strip conductor 3 extends from one end to the other end of the dielectric substrate 2, and has a branch portion 14 and four quarter-wave transformers 13.
And four branch lines 7 corresponding to these, and are integrally configured.

The four quarter-wave transformers 13 are connected to the integrated branching unit 14, and separate branch lines 7 are connected to the respective quarter-wave transformers 13. The three isolation resistors 10 are provided at positions where the ¼ wavelength transformer 13 and the branch line 7 are connected to each other so as to connect the lines adjacent to each other.

The four quarter-wave transformers 13 are distributed in an arc shape with a narrow line width obtained by dividing the branch portion 14, and each branch line 7 is formed to have substantially the same width as the branch portion 14 and from the base end. It is almost rectangular toward the end.

In this way, between the four quarter-wave transformers 13 and four
Between the branch lines 7 of the book, arc-shaped grooves that widen toward the other end of the dielectric substrate 2 are defined. Thus, the input end P ₁ is provided at the end face of the branch portion 14, and the output end P _{2 is provided} at the tip of each branch line 7.
~ P ₅ is formed.

Further, the quarter-wave transformer 13 includes a branching unit 14 (input end).
The line width is determined such that the parallel connection of the input impedances when the output ends P _{2 to} P ₅ are viewed from P ₁ ) becomes equal to the characteristic impedance of the micro transmission line 4.

If it is constant, if n → large, then Zn → large, and the characteristic impedance of the quarter-wave transformer 13 must be set to a substantially high impedance with a large number of distributions.

Next, the operation will be described. The microwaves incident from the input terminal P ₁ are responsive to the input impedance ratio of the output terminals P _{2 to} P ₅ seen from the branch section 14 at the connection section between the branch section 14 and each ¼ wavelength transformer 13. The distribution ratio is taken out to the output terminals P _{2 to} P ₅ of the four branch lines 7.

At this time, the operation of the quarter-wave transformer 13 causes the input terminal
Since the impedance matching seen from P ₁ is obtained, the microwave incident on the input terminal P ₁ is distributed to the output terminals P _{2 to} P ₅ without being reflected.

Further, the output terminals P _{2 to} P ₅ (branch lines 7) are mutually isolated by the action of the isolation resistor 10.

[Problems to be solved by the invention]

Since the conventional power distributor is configured as described above, when the number of distributions increases, the output terminal seen from the input terminal P ₁
In order to achieve impedance matching with P _{1 to} P _n , it is necessary to increase the characteristic impedance of the quarter-wave transformer 13, and the line width becomes extremely narrow, resulting in increased transmission loss.
There was a problem that processing of the transmission line became difficult.

The present invention has been made in order to solve the problems as described above, and an object thereof is to obtain a power distributor which has a small transmission loss and is easy to process a transmission line.

[Means for solving problems]

In the present invention, in a power distributor including a dielectric substrate 2 of substantially the same shape stacked on a flat ground conductor 1 and a strip conductor 5 stacked on the dielectric substrate 2,
The strip conductor 5 has an input portion 7 provided at one end of the dielectric substrate 2, a tapered intermediate portion 6 connected to the input portion 7 and widened, and connected to the intermediate portion 6 and extended at a point on the input portion 7. It is composed of a fan-shaped or linear output part 8 divided by a slit 9 having intersecting lines, and the slits 9 are radially arranged in a direction along an arc normal centering on a point on the input part 7. It was made to be done.

[Action]

Microwaves incident from the input section 7 propagate radially in the wide and wide intermediate section 6, and are distributed and output from the respective output sections 8. Loss during propagation is small and strip conductor 5
It becomes easy to process the transmission line.

Example of Invention

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a flat ground conductor, 2 is a dielectric substrate stacked on the ground conductor 1, 5 is a substantially triangular strip conductor bonded on the dielectric substrate 2, and 4 is a ground conductor 1 and a dielectric. The microstrip line is composed of the body substrate 2 and the strip conductor 5. The strip conductor 5 extends from one end to the other end of the dielectric substrate 2, and is integrally configured of a rectangular minimum width input portion 7, an arc-shaped tapered intermediate portion 6 and four output portions 8. . Each output portion 8 is separated by three slits 9 having the same width, and an input end P ₁ is formed on the end face of the input portion 7 and output ends P _{2 to} P ₅ are formed at the tip of each output portion 8.

The slit 9 is centered on one point A, which is a connection point between the input section 7 and the intermediate section 6, on the central axis of the strip conductor 5, and extends from the arc 1 having a predetermined radius on the strip conductor 5 to the output terminal P ₂ The strip conductors 5 are cut out in the same width along the normal line of the arc l in the direction of to P ₅ . The isolation resistor 10 is provided in the slit 9 so as to detect the microwave of 1 that propagates through the microstrip line 4 from the input terminal P ₁ side.
It is provided at the position of / 4 wavelength.

Each output portion 8 has a tapered shape (fan shape), and has the other end widened with the small arcs a to d obtained by dividing the arc l as one end. One end of each slit 9 starts from the small arcs b and c at both ends, and the lengths of the small arcs a to d can be freely set when the slit 9 is shaped.

Next, the operation will be described. Microwaves incident from the input terminal P ₁ propagate radially through the microstrip line 4 and through the tapered intermediate portion 6. Further, the slit 9 divides into four power ratios according to the lengths of the small arcs a to d (spacing of the slits 9), and is taken out to the output terminals P _{2 to} P ₅ through the four output portions 8.

The tapered intermediate portion 6 is arranged from the input terminal P ₁ side to the output terminals P _{2 to} P ₅
The impedance becomes lower as it gets closer to the side.
The intermediate part 6 has the same characteristic impedance as the input part 7 at the connection part with the input part 7, and at the connection part with the output part 8,
It has an impedance equal to the impedance due to the parallel connection of the four output parts 8 in this connection part.

As described above, in the above power distributor, impedance matching between the input and output terminals is achieved by the tapered intermediate portion 6 made of a wide strip conductor line, so that there is little loss and line processing is easy.

In addition, since the microwaves incident from the input terminal P ₁ propagate radially in the tapered intermediate portion 6, the points on the arc l around the point A on the input end side in FIG.
The electric current flows in the direction normal to this arc. Therefore, there is almost no reflection or loss due to the slits 9 radially arranged in the direction along the normal line of the arc centering on the point A.

The output terminals P _{2 to} P ₅ are mutually isolated by the action of the isolation resistor 10.

FIG. 2 is a schematic configuration diagram of a power distributor according to a second embodiment of the present invention, in which the slit 9 is centered on a point A which is an intersection of extension lines of the slits 9 and has a radius of about 1/4 wavelength. (On) This is a case where two different types of arcs l ₁ and l ₂ are radially arranged with the ends on the input end side. Central slit 9a is an arc l ₂ than 1/4 wavelength shorter radius of the arc l above ₁ and the starting end, slits 9, 9 on both sides of the slit 9a is arcuate
l ₂ is the starting point. Since the ends of the slits 9 and 9a are located at positions different from the input terminal P ₁ by 1/4 wavelength,
The reflections at the ends of the slits 9 and 9a cancel each other out, and the reflection characteristics at the input end are improved.

The embodiment of FIG. 2 has the same operating principle and advantages as the embodiment of FIG.

FIG. 3 is a configuration diagram of a power distributor according to a third embodiment of the present invention, in which a V-shaped slit 90 is used instead of the slit 9 having the same width. The V-shaped slit 90 is
The slit width widens toward the output end as the distance from the input end increases, and the shape is axisymmetric with respect to the normal line of the arc centered at the point A. By using the V-shaped slit 90, the impedance change of the output section 8 can be made small, the interval between the output terminals P _{2 to} P ₁ can be widened, and the isolation between the output sections 8 can be made large.

The embodiment of FIG. 3 has similar operating principles and advantages to those of the embodiment of FIG.

FIG. 4 is a block diagram of a power distributor according to a fourth embodiment of the present invention, in which a dielectric plate 11 is overlaid and adhered on a strip conductor 5 of the same shape as in the first embodiment, and further, this dielectric plate 11 is used. The ground conductor 1a is adhered on the top to form the triplate line 40. Ground conductors 1 and 1a and dielectric plates 2 and 1 lined up from above and below
Reference numeral 1 has a substantially identical shape, and has an integrated structure in which strip conductors 5 are sandwiched and stacked. A groove is formed in one of the dielectric plates 11 and the strip conductor 5 is embedded therein.

FIG. 5 shows a fifth embodiment of the invention and shows a suspended line 400. A dielectric substrate 2 is supported in a hollow box-shaped ground conductor 1, and strip conductors 5a and 5b having the same shape as in the first embodiment are adhered to both sides of the dielectric substrate 2. These strip conductors 5a and 5b have substantially the same shape and are adhered to the dielectric substrate 2 so as to overlap each other, and these strip conductors 5a and 5b are separated from the inner wall of the ground conductor 1.

The fourth and fifth embodiments have the same operation principle and effect as the first embodiment.

It should be noted that, in the above-described embodiment, the case of the 4-divider is explained, but it may be divided into 2 divisions, 3 divisions, or 5 divisions or more, and the same effect as that of the above-mentioned embodiment is obtained.

Further, in the above-described embodiment, the embodiment in which the isolation resistor 10 is provided has been described. However, when the isolation between the output terminals is not necessary, it may be applied when there is no isolation resistor.

Further, in the above embodiment, the case where the contour line of the tapered intermediate portion is a straight line has been described, but the present invention can also be applied to the case of a curved line.

〔The invention's effect〕

As described above, according to the present invention, in a power distributor composed of a substantially same-shaped dielectric substrate stacked on a flat ground conductor, and a strip conductor stacked on the dielectric substrate, A strip conductor is provided at one end of the dielectric substrate, a taper-shaped intermediate portion is connected to the input portion and widens, and a slit is formed so that the extension line intersects with the intermediate portion at one point on the input portion. Since it is composed of a fan-shaped or linear output section that is divided,
A microwave power distributor can be formed with a wide line, the loss during transmission can be reduced, and the line can be easily processed.
In addition, since the microwaves incident from the input section propagate radially in the tapered intermediate section, points on an arc centered on one point on the input section become equipotential, and the current flows in the normal direction of this arc. , The slits are arranged radially at a point on the input section and are arranged radially in a direction along the normal line of an arc centered at a point on the input section, so that reflection and loss due to the slit occur. Absent.

[Brief description of drawings]

1 is a block diagram showing a microwave power distributor according to a first embodiment of the present invention, FIG. 2 is a block diagram showing a power distributor according to a second embodiment of the present invention, and FIG. 3 is a block diagram showing the present invention. Third
FIG. 4 is a configuration diagram showing a power distributor according to an embodiment, FIG. 4 is a partially omitted configuration diagram showing a power distributor according to a fourth embodiment of the present invention, and FIG. 5 is a power distribution according to a fifth embodiment of the present invention. FIG. 6 is a missing configuration diagram showing a power supply unit, and FIG. 6 is a configuration diagram showing a conventional power distributor. 1 ... Ground conductor, 2 ... Dielectric substrate, 4 ... Microstrip line, 5 ... Strip conductor, 6 ... Tapered intermediate part, 7 ... Input part, 8 ... Output part, 9 ... Slit ,
10 ... Isolation resistance, l ... Arc.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumio Takeda 5-1-1, Ofuna, Kamakura-shi, Kanagawa Mitsubishi Electric Corporation Information & Electronics Laboratory (56) Reference JP-A-56-10701 (JP, A) Table Sho 63-503429 (JP, A)

Claims (8)

[Claims] 1. A power distributor comprising a dielectric substrate of substantially the same shape stacked on a flat ground conductor, and a strip conductor stacked on the dielectric substrate, wherein the strip conductor is the dielectric substrate. An input section provided at one end of the input section, a tapered intermediate section which is continuous with the input section and widens, and a fan-shaped section which is continuous with the intermediate section and is divided by a slit whose extension line intersects at a point on the input section or A microwave power distributor, comprising: a linear output part, wherein the slits are radially arranged in a direction along a normal line of an arc centered on a point on the input part. 2. The microwave power distributor according to claim 1, wherein one end of the slit is arranged on a circular arc centered on a point on the input portion. 3. The slit according to claim 1, wherein one end of the slit is arranged on two kinds of arcs having a radius of about 1/4 wavelength with a point on the input portion as a center.
A microwave power divider according to the paragraph. 4. The microwave power distributor according to claim 2 or 3, wherein the slit has a constant width. 5. The microwave according to claim 2, wherein the slit gradually widens in a V shape toward the other end of the dielectric substrate. Power distributor. 6. A triplate line in which the other dielectric substrate and the ground conductor are stacked on the strip conductor in a substantially symmetrical manner with respect to the dielectric substrate and the ground conductor, thereby forming a triplate line. The microwave power distributor according to item 5 or 5. 7. A suspended line in which the strip conductors are laminated on both sides of the dielectric substrate to be inserted into a hollow ground conductor, to thereby form a suspended line. Microwave power distributor. 8. The microwave power distributor according to claim 4, wherein an isolation resistor is attached to the slit.