JPH01166602A - Power distributer - Google Patents

Abstract

PURPOSE:To improve the characteristic by connecting two output terminals having the same characteristic impedance as the characteristic impedance of one input terminal in Y-shape and varying the characteristic impedance between the connection part and the output terminals gradually. CONSTITUTION:The input terminal part 11 and the two output terminal parts 12, 13 are connected in Y-shape to form a distributed constant line 10, which is connected to distributed constant lines having an equal characteristic impedance such as 50OMEGA. The Y-shaped connection parts 14a, 15a have a width d1 to give a characteristic impedance of 100OMEGA respectively and connecting points 14b, 15b between impedance change parts 14, 15 and the output terminals 12, 13 have a width d2 to give an impedance of 50OMEGA. The connecting points 14b, 15b and 15a,15b are connected by a linear taper wire, and its length L is selected as 1/4 of a guide line signal wavelength or over and a lumped constant element 16 of 100OMEGA is connected between the points 14b and 15b. Thus, the coupling characteristic and the reflection characteristic are improved over a wide band.

Description

[Detailed Description of the Invention] [Summary] Regarding the electric horn divider used in the microwave band and millimeter wave band, the purpose is to have good coupling characteristics and return loss characteristics over a wide band, and to have a characteristic impedance of a constant value. a plurality of output terminal sections each having a characteristic impedance of the constant value, a connection point between the input terminal section and each of the plurality of output terminal sections, and a connection point with the input terminal section; The composite value of the characteristic impedances of the plurality of output terminals is defined as the constant value, and the characteristic impedance of the connection point with each of the plurality of output terminals is defined as the constant value, and the characteristic impedance of the connection point with each of the input terminals and the plurality of output terminals is defined as the constant value. and a plurality of non-uniform line parts whose characteristic impedance gradually changes between the connection points with the respective parts, and distributes the power of the signal entering the input terminal part to each of the plurality of output terminal parts. Configure it like this.

[Industrial application field]

The present invention relates to a power divider, and more particularly, to a power divider used in microwave bands and millimeter wave bands.

Various types of power dividers used in the microwave band and millimeter wave band have been developed, such as Wilkinson type, interdigital type, branch line type, and rat race type. Each of these power dividers has advantages and disadvantages, and the Wilkinson type has a simple structure and is easy to manufacture, but it does not have broadband frequency characteristics.

[Conventional technology]

FIG. 5 shows a plan view of a conventional Wilkinson type power divider. In the figure, a distributed constant line 1 is approximately Y-shaped and has a handle part 2 with a characteristic impedance of 50Ω, and a handle part 2 with a characteristic impedance of 50Ω.
The uniformly distributed constant line of flΩ has a length of λQ/4 (
λQ is the tube wavelength), and the end 2a of the handle 2 is the input terminal, and the end 3a of the arm 3.4 is the input terminal.
.

4a is an output terminal. Also, the end portion 3a.

4af! l is connected by a lumped constant element 5 having a resistance value of 100Ω. This reduces the power supplied to the input terminal by 2
Outputs at -3dB from each output terminal.

The above power divider is as shown in FIGS. 6(A) and (B).
Coupling/frequency characteristics, input terminal return loss/
Has frequency characteristics.

[Problem that the invention seeks to solve]

The conventional power divider has a center frequency fo as shown in Fig. 6(A).
(fo=c/λg C is the speed of light, fO is 4GHz in this case
＞ and its harmonics, it shows good characteristics at about -3 output, but for example, the frequency that becomes -3.25 dB or more is about 2 to 25 dB.
The frequency with a narrow bandwidth of 6 GHz and the return loss of -20'' or less as shown in the same figure (B) is also the center frequency f.
, and its harmonic number, which has a narrow bandwidth of about IGH2.The present invention was made in view of the above points, and has good coupling characteristics and return loss characteristics over a wide band. The purpose is to provide a power divider.

[Means for solving problems]

The power divider of the present invention includes an input terminal section (11) having a characteristic impedance of a constant value, a plurality of output terminal sections (12, 13) each having a characteristic impedance of a constant value, and an input terminal section (11). A plurality of output terminal sections (12, 13) are connected to each other, and the composite value of the characteristic impedance at the connection point with the input terminal section (11) is set to a constant value, and ) The characteristic impedance at the connection point with each of the input terminal sections (11) is set to a constant value, and the characteristic impedance between the connection point with each of the input terminal sections (11) and the connection point with each of the plurality of output terminal sections (12, 13) is set to a constant value. Multiple uneven line sections that gradually change (14°15.24.25.34.35)
and has.

[Effect]

In the present invention, the uneven line portion (14, 15° 24.
The characteristic impedance of 25.34.35) is the connection point with the input terminal section (11) and the plurality of output terminal sections (12, 13).
The impedance changes gradually between the connecting point and the impedance conversion property is good over a wide band, and therefore the coupling characteristics and return loss characteristics of the power divider are good over a wide band.

〔Example〕

FIG. 1 shows a plan view of a first embodiment of the invention.

In the figure, the distributed constant line 10 has a substantially Y-shape, and includes an input terminal portion 11 with a characteristic impedance of 50Ω, an output terminal portion 12.13 with a characteristic impedance of 50Ω, and this input terminal portion 11 with a characteristic impedance of 50Ω.
and non-uniformly distributed constant line portions 14 and 15 of the output terminal portions 12 and 13, respectively.

The input terminal portion 11 and the output terminal portions 12 and 13 are each connected to a distributed constant line having a characteristic impedance of 50Ω.

The unconstrained distributed constant line sections 14 and 15 are connected to the input terminal section 11, respectively.
The characteristic impedance is 1 at each of the connection points 14a and 158.
00Ω, and the characteristic impedance is 5 at the connection points 14b and 15b with the output terminal portions 12 and 13, respectively.
Width d2 and sale angle for 0Ω, connection points 14a, 14b
Between and 15a.

This is a linear Taber line in which the width, that is, the characteristic impedance, changes linearly between 15b and 15b. The length of each of the unconstrained distributed constant line sections 14 and 15 is the internal wavelength λ of the signal to be used.
It is said to be more than 1/4 of Q.

Further, the connection points 14b and 15b are connected by a lumped constant element 16 having a resistance value of 100Ω.

Here, if the lengths of the unconstrained distributed constant line sections 14 and 15 are the same as the lengths of the arm sections 3 and 4 in FIG. 5, the power divider in FIG. .

It has coupling frequency characteristics and input terminal return frequency characteristics as shown in (B).

In other words, the power divider in Fig. 1 has a coupling characteristic of -3.25 cf3 or more in a frequency band of 4 GHz or more,
Further, the return loss characteristic of the input terminal section 11 is 115 cE or less in a frequency band of 5 GHz or more, and has good coupling characteristics and return loss characteristics in a wide band.

Such good characteristics are achieved by the non-uniformly distributed constant line section 14.1.
This is achieved because the characteristic impedance of each of the 5 elements changes gradually and has good impedance conversion performance over a wide band.

3 and 4 respectively show the second and third parts of the power divider of the present invention.
A plan view of an example is shown. In both figures, parts that are the same as those in FIG.

In FIG. 3, the distributed constant line 20 has non-uniform distributed constant lines 24 and 25 between the input terminal section 11 and the output terminal section 12 and 13, respectively. This non-uniformly distributed constant line 24
．． Each of 25 has a width d1 such that the characteristic impedance is 1000 at the connection points 24a and 25a with the input terminal 11, and a width d2 such that the characteristic impedance is 50Ω at the connection points 24b and 25b with the output terminal 12 and 13, respectively, This is an exponential Taber line in which the width, that is, the characteristic impedance, changes exponentially between the connection points 24a and 24b and between 25a and 25b.

In FIG. 4, the distributed constant line 30 has nonuniform distributed constant lines 34 and 35 between the input terminal section 11 and the output terminal section 12 and 13, respectively. This non-uniformly distributed constant line 34
．． Each of 35 has a width d1 such that the characteristic impedance is 100Ω at the connection points 34a and 35a with the input terminal 11, and a width d2 such that the characteristic impedance is 50Ω at the connection points 34b and 35b with the output terminal 12 and 13, respectively, It is a cinesoidal Taber line in which the width, that is, the characteristic impedance, changes sinusoidally between the connection points 34a and 34b and between 35a and 35b.

No. 2 above. In the third embodiment, as in the first embodiment, good coupling characteristics and return loss characteristics can be obtained over a wide band.

〔Effect of the invention〕

As mentioned above, the power divider of the present invention has coupling characteristics,
It has good return loss characteristics over a wide band and is extremely useful in practice.

[Brief explanation of the drawing]

1, 3, and 4 are plan views of each embodiment of the power divider of the present invention, and FIG. 2 is a diagram showing the coupling characteristics and return zero characteristics of the power divider of FIG. 1. , FIG. 5 is a plan view of an example of a conventional power divider, and FIG. 6 is a diagram showing coupling characteristics and return loss characteristics of the power divider of FIG. 5. In the figure, 10.20.30 indicates a distributed constant line, 11 indicates an input terminal section, 12.13 indicates an output terminal section, and 14.15.24.25.34.35 indicates a non-uniform distributed constant line section. The heather 1st river's ★ri λ Ichi-j's chanting word-shi'' N
Kohonse〃1,200 rights or 1-sokebetsu

Claims (1)

[Claims] An input terminal section (11
), a plurality of output terminal sections (12, 13) each having the characteristic impedance of the constant value, the input terminal section (11) and the plurality of output terminal sections (12, 1).
3) the composite value of the characteristic impedance of the connection point with the input terminal section (11) is set as the constant value;
The characteristic impedance of the connection point with each of the plurality of output terminal sections (12, 13) is set to the constant value, and the characteristic impedance of the connection point with each of the input terminal section (11) and the plurality of output terminal sections (12, 13) is set to the constant value.
13) A plurality of non-uniform line parts (14, 15, 24,
25, 34, 35), and the power of the signal entering the input terminal section (11) is transferred to the plurality of output terminal sections (12, 13).
) A power divider characterized by distributing power to each.