JPH01295502A - Power distributor - Google Patents

Abstract

PURPOSE:To decrease the transmission loss and to facilitate the working of lines by providing a susceptance cancelling part projected in a lateral direction near a connection part between an input part and a middle part of a strip conductor. CONSTITUTION:The strip conductor 5 is prolonged from one end 2a of a dielectric base 2 to other end 2b and consists of a rectangular input part 7 with a minimum width, a sectional tapered middle part 6, four output parts 8 and two open tip stubs 11 being susceptance parts integrally. The length of the tip open stub 11 is shorter than 1/4 wavelength of a microwave and the stub 11 is provided projectingly near a connection part 7a between the input part 7 and the middle part 8 in a broadwise direction. The output part 8 is separated by 3V-shaped slits 9, and each part 8 is made of a long piece whose one end is formed by a small circular arc (a to d) being divisions of a circular arc lhaving a prescribed length of radius drawn onto the strip conductor 5 around a point A of the connection part 7a between the input part 7 and the middle part 7 on the center axis of the strip conductor 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power divider on a transmission line mainly used in microwaves.

[Prior Art] A conventional power divider that branches microwave signal waves on a transmission line as necessary is the 1977 IEEE
TT-5 International Microwa
For example, a four-power power divider is shown in FIG. 6. In the figure, 4 is a conventional microstrip line. It is composed of a dielectric substrate 2 of substantially the same shape superimposed on the conductor 1, and a strip conductor 3 bonded onto the dielectric substrate 2.The strip conductor 3 is connected to one end 2a of the dielectric substrate 2. It extends from to the other end 2b, and is integrally formed with a branch part 14, four quarter-wavelength transformers 13, and four branch lines 15 corresponding to the quarter-wavelength transformers 13. The four 1/4 wavelength transformers 13 are arranged so as to be distributed in an arc shape with a narrow line width obtained by dividing the branch section 14. They are each connected to the four-wavelength transformer 13 separately, and consist of a substantially concave-width elongated piece with the branch section 14 from the base end to the terminal end.The quarter-wave transformer 13 and the branch line 15 are also connected. An isolation resistor 10 is provided at a position to connect between the adjacent branch lines 15.In this way, between the four 1/4 wavelength transformers 13 and between the four 1/4 wavelength transformers 13, A dielectric base F is provided between the branch lines 15 of
Arc-shaped grooves that widen in the direction of the other end 2b of i2 are defined, respectively. In this way, the input terminal P is connected to one end 2a of the dielectric substrate 2 on the branch line 14 side, and the input terminal P is connected to the dielectric substrate 2 on the branch line 15 side.
Output terminals P2 to P5 are formed at the other end 2b. Also,
The above-mentioned 1/4 wavelength transformer 13 is constructed by connecting the input impedances of each 1/4 wavelength transformer 13 in parallel when looking at the output terminals P2 to P5 from the branching part 14, and the microstrip line 4 at the input terminal P1 is connected in parallel. The line width is determined to be equal to the characteristic impedance.

That is, if +r is constant, then if n→large, zn→person, and the characteristic impedance of the 1/4 wavelength transformer 13 needs to be made higher as the number of distributions increases.

Next, the operation will be explained. The microwave incident from the input terminal P1 is taken out to the output terminals P2 to P5 of the four branch lines 15 at a distribution ratio according to the input impedance ratio when looking at the output terminals P2 to Ps side from the branch part 14. At this time, due to the function of the 1/4 wavelength transformer 13, the input terminal P
Since impedance matching seen from the input terminal P1 is obtained, the microwave incident on the input terminal P1 is distributed to the output terminals P2 to P5 without being reflected. In addition, the above output terminal P
2 to P5 (branch line 15) are isolated (electrically isolated) from each other by the action of the isolation resistor 10.

[Problem to be solved by the invention] Since the conventional power divider is configured as described above,
When the number of distributions increases, the output terminal P seen from the input terminal P1
In order to achieve impedance matching to 2 to Pn, it is necessary to increase the characteristic impedance of the 1/4 wavelength transformer 13, which may result in an extremely narrow line width and increased transmission loss.
There were problems such as making it difficult to process the transmission line.

This invention was made to solve the above-mentioned problems, and aims to provide a power divider with low transmission loss and easy processing of transmission lines.

[Means for Solving the Problems] A power divider according to the present invention is provided with a susceptance canceling portion protruding in one width direction near a connection portion between an input portion and an intermediate portion of a strip conductor.

[Function] The power divider according to the present invention does not separate the 1/4 wavelength transformer 13 by the susceptance canceling portion protruding in the width direction provided near the connection portion between the input portion and the intermediate portion of the strip conductor. As a wide expanding middle section,
Microwaves from the input section propagate radially to the intermediate section without reflection, and are distributed and output from each output section.

[Embodiment] A power divider which is an embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Components that are the same as those in FIG. 6 are designated by the same reference numerals, and the description thereof will be omitted. In the figure, reference numeral 5 denotes a substantially triangular strip conductor bonded onto the dielectric substrate 2;
It extends from one end 2a to the other end 2b, and includes a rectangular input section 7 with the minimum width, a fan-shaped tapered intermediate section 6, four output sections 8, and two susceptance canceling sections. It is integrally molded with the open-end stub 11. The open-end stub 11 has a length shorter than the 1/4 wavelength of the microwave, and is provided near the joint 7a between the input section 7 and the intermediate section 8 so as to protrude in the width direction. Above output section 8
is separated by three V-shaped slits 9, and is drawn on the strip conductor 5 with the center point A of the connection part 7a between the input part 7 and the intermediate part 6 on the central axis of the strip conductor 5. It consists of a long piece whose end is a small arc a = d obtained by dividing an arc λ having a radius of a predetermined length.

In this way, the input terminal P1 is formed at one end 2a of the dielectric substrate 2 on the input section 7 side, and the output terminals P2 to P are formed on the other end 2b of the dielectric substrate 2 on the output section 8 side. Also, the above small arc a =
The length ratio d can be freely set when forming the slit 9. The slit 9 has a shape in which the slit width increases toward the output terminals P2 to Ps, and the circular arc l
It is axially symmetrical with respect to the normal line of
It is provided so as to cut out the strip conductor 5 along the normal line of the circular arc 1 in the direction of ~P5. The isolation resistor 10 connects adjacent output parts 8 from the input terminal P1 side of the slit 9, that is, from the arc 1 to a position 1/4 wavelength of the microwave propagating through the microstrip line 4. It is provided.

Next, the operation will be explained. Microwaves incident from the input terminal P1 pass through the microstrip line 4 and propagate radially in the intermediate section 6. Furthermore, the power is divided into four parts by the slit 9 at a power ratio according to the length of the small arc a'' d (the interval between the slits 9), and is taken out through the four output parts 8 to the output terminals P2 to P5. 6 becomes continuously low in impedance as it approaches the output terminals P2 to Ps from the input terminal P1 side.The intermediate section 6 has a characteristic impedance equal to that of the input section 7 at the connection section 7a with the input section 7, and The connection part with the output part 8, that is, the arc l
It has an impedance equal to the impedance due to the parallel connection of the four output sections 8.

Next, the function of the open-end stub 11 shorter than 1/4 wavelength will be explained using FIG. 2. In the figure, in the strip conductor 22 which is not provided with the open-end stub 11 as shown in FIG.
The electric flux in the cross section is as shown in FIG. 2(b). Next, near the joint 7a between the input section 7 and the intermediate section 6, that is, B
In the -B cross section, since the width of the strip conductor 22 increases, the microwave is reflected due to the inductive susceptance caused by the high-order TE3° mode as shown in FIG. 2(8). The open-end stub 11 is a TEI shown in FIG. 2(d). mode electric flux is generated to cancel the inductive susceptance of the TEso mode shown in FIG.
), that is, the input section 7 in FIG. 2(b).
The state becomes the same as the electric flux of , and the microwave from the input section 7 is made incident on the intermediate section 6 without reflection.

Furthermore, since the microwave incident from the input terminal P1 propagates radially in the tapered intermediate portion 6, the points on the arc 1 centered on the point A on the input terminal P1 side in Fig. 1 are at equal potential. , and the current flows in the normal direction of the second circular arc A. Therefore, there is almost no reflection or loss due to the slits 9, which are arranged radially in the direction along the normal line of the arc centered on point A and whose width gradually widens.

FIG. 3 shows a power divider according to a second embodiment of the present invention, in which an intermediate portion 60 of the strip conductor 5 has a larger opening angle than the opening angle of the intermediate portion 60, and the tip thereof is connected to the input portion 7 intermediately. It has a susceptance canceling part 51 which is approximately fan-shaped and narrows in a step shape at a position approximately 178 waves away from the joining part 7a with the part 60, that is, cuts inward.

This susceptance canceling portion 51 is a high-order TE generated near the connecting portion 7a between the input portion 7 and the intermediate portion 6o, similar to the open-end stub 11 shown in FIG.

This has the effect of canceling the inductive susceptance caused by the mode and allowing the microwave from the input section 7 to enter the intermediate section 60 without reflection.

FIG. 4 shows a power divider according to a third embodiment of the present invention, in which a dielectric substrate 20 is superposed and bonded on the strip conductor 5 bonded on the dielectric substrate 2 shown in FIG. death,
Further, a ground conductor 1 was bonded onto this dielectric substrate 20 to form a triplate line 40. A groove is formed in the dielectric substrate 20 and a strip conductor 5 is embedded therein. The above-mentioned triplate line 40 has the same effect as the first embodiment, and can be shielded by the upper and lower ground conductors 1, 1, so that the microwave propagating in the power divider is not radiated into space. have In addition, the above triplate line 40
A similar effect can be obtained by replacing the strip conductor 5 with the strip conductor 5 shown in FIG.

Further, FIG. 5 shows a power divider according to a fourth embodiment of the present invention, and in the figure, reference numeral 41 indicates a suspended line 41.
It is. This suspended line 41 includes a hollow ground conductor 45 made of a casing, a dielectric substrate 21 supported approximately in the middle of this ground conductor 45, and strip conductors 5 bonded to both upper and lower sides of this dielectric substrate 21. , 5. The strip conductors 5, 5 are bonded to the dielectric substrate 21 so as to overlap with each other, and the strip conductors 5, 5 are separated from the inner wall of the ground conductor 45. The suspended line 41 has the same effect as in the first and third embodiments, and since the space between the ground conductor 45 and the strip conductors 5, 5 is hollow, there is no dielectric loss. , has the effect of reducing line transmission loss. Furthermore, the same effect can be obtained by replacing the strip conductors 5, 5 with the strip conductor 5 shown in FIG.

In the above embodiment, the case where the power divider is a 4-way power divider has been described, but it may be a 2-way power divider, a 3-way power divider, a 5-way power divider or more.

In addition, in the above embodiment, the isolation resistor 1
0 is provided between each of the output terminals 22 to 25, that is, in the slit 9, but if isolation between the output terminals 22 to 25 is not required, the isolation resistor 10 may not be provided.

Further, in the above embodiment, the contour line of the intermediate portion 6 and the slit are straight lines, but the present invention can also be applied to curved lines.

[Effects of the Invention] As described above, according to the present invention, the power divider is provided with a susceptance canceling portion protruding in the width direction near the connection portion between the input portion and the intermediate portion, so that the intermediate portion is It can be formed with a wide expanding strip conductor, reducing transmission loss and making the line easier to process.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a power divider which is an embodiment of the present invention, FIGS. 2(a) to (8) are diagrams showing the operating principle of the power divider, and FIG. 3 is another embodiment. An external perspective view of a power distribution diagram as an example, FIGS. 4 and 5 are external perspective views showing a power divider of other embodiments with some parts missing, and FIG. 6 is an external view showing a conventional power divider. FIG. DESCRIPTION OF SYMBOLS 1... Ground conductor, 2... Dielectric substrate, 4... Microstrip line, 5... Strip conductor, 6... Intermediate paper 7... Input section, 8... Output section, 9 ... Slit, 10 ... Isolation resistor, 11 ... Open end stub, P, ... Input terminal, P2 to Ps ... Output terminal, G ... Arc. Agent Masuo Oiwa (and 2 others) Figure 3 51: Susceptance cancellation part, 60: Intermediate part 20: Dielectric substrate, 40 Nitri plate line procedure amendment (voluntary)

Claims (3)

[Claims] (1) Consists of a flat ground conductor, a dielectric substrate provided on this ground conductor, and a strip conductor superimposed on this dielectric substrate, and the strip conductor is connected to the input section and this A power distribution unit consisting of a fan-shaped tapered middle part connected to the input part and widened, and an output part connected to this middle part and divided by a slit whose center line intersects at one point of the input part. 1. A power divider, characterized in that a susceptance canceling portion protruding in the width direction is provided near a connecting portion between the input portion and the intermediate portion. (2) The power divider according to claim 1, wherein the susceptance canceling portion is composed of an open-ended stub shorter than 1/4 wavelength. (3) The susceptance canceling part has an opening angle larger than that of the intermediate part, and has a nearly fan-shaped tip that narrows in a step shape at a position approximately 1/8 wavelength from the connection part between the input part and the intermediate part. The power divider according to claim 1, characterized in that: