KR20130130939A - Dual band unequal power divider - Google Patents

Dual band unequal power divider Download PDF

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Publication number
KR20130130939A
KR20130130939A KR1020120054609A KR20120054609A KR20130130939A KR 20130130939 A KR20130130939 A KR 20130130939A KR 1020120054609 A KR1020120054609 A KR 1020120054609A KR 20120054609 A KR20120054609 A KR 20120054609A KR 20130130939 A KR20130130939 A KR 20130130939A
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KR
South Korea
Prior art keywords
transmission line
power divider
impedance value
present
ratio
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Application number
KR1020120054609A
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Korean (ko)
Inventor
김영
강명석
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금오공과대학교 산학협력단
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Priority to KR1020120054609A priority Critical patent/KR20130130939A/en
Publication of KR20130130939A publication Critical patent/KR20130130939A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H01P5/085—Coaxial-line/strip-line transitions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/12—Coupling devices having more than two ports
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/12—Coupling devices having more than two ports
    • H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
    • H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
    • H01P5/184—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being strip lines or microstrips

Abstract

The present invention relates to an asymmetric power divider, when the power distribution ratio between the output terminals increases, the transmission line having a large impedance value and the transmission line having a small impedance value are calculated and separated using a design equation, and the transmission line having the small impedance value is used. It is calculated by the dual transmission line and modified, and provides asymmetrical power divider to have a high power ratio by connecting a capacitor in parallel with the transmission line having a large impedance value of the long transmission line of the modified transmission line in both sides.
Although a high impedance transmission line of a conventional asymmetric power divider is used by a method using a coupling line or by etching the back side of a transmission line, the present invention uses a modified dual transmission line and a capacitor using a low impedance transmission line. By implementing a high ratio asymmetric power divider, it is possible to use a transmission line having a low impedance which is difficult to implement in a conventional asymmetric power divider, and to provide an asymmetric power divider having a ratio of 5: 1 by a microstrip technology. It is a useful invention.

Description

Dual band unequal power divider

The present invention relates to an asymmetric power divider, and more particularly to an asymmetric power divider having a high power ratio using microstrip technology.

In general, the power divider is a circuit that distributes the power input from the RF circuit at a predetermined ratio to the output port, which not only distributes the power at a desired ratio without losing power, but also isolates the output ports and It is ideal to prevent circuit characteristic changes due to mutual influences.

In addition, the power divider can be used as a power synthesizer by switching the input and output ports, this power divider is a technology belonging to the field of information and communication signal processing is used in the circuit operated at the signal transmitting and receiving end, the purpose of communication Signal distribution, for example, power supply circuits for antenna arrays, balance mixers, balance amplifiers, and inspection equipment.

On the other hand, power splitters using microstrip lines are widely used in the field of information communication signal processing, but power splitters using microstrip lines used in RF communication are intended to be implemented when the power distribution ratio between output terminals increases. The impedance of the transmission line is large and the impedance of the transmission line is small.

As such, when the impedance value of the transmission line is large and small, the line width of the microstrip line implemented on the printed circuit board (PCB) is, for example, less than 0.1 mm, or is increased to several tens of mm. In reality, it was difficult to implement a power divider having a large power distribution ratio using microstrip technology.

The present invention has been made to improve the above-described problems, and when the asymmetric power divider having a large power distribution ratio is implemented, the impedance value of the output terminal is divided into the larger and smaller ones, and the impedance value is small. It is an object of the present invention to provide an asymmetric power divider having a high power ratio by implementing a transmission line on the side as a modified dual transmission line.

In the asymmetric power splitter according to the present invention for achieving the above object, in the asymmetric power splitter, if the power distribution ratio between the output terminals is large, the transmission line having a large impedance value and the transmission having a small impedance value using a design equation Calculating and separating the transmission line, calculating and transforming the transmission line having a small impedance value into a dual transmission line, and connecting a long transmission line of the modified transmission line to a transmission line having a high impedance value in parallel with both capacitors Have a power ratio.

The design equation of the present invention is

Figure pat00001

Figure pat00002

Figure pat00003

Figure pat00004

Figure pat00005

Here, k 2 is characterized in that the power distribution ratio.

Equation for calculating and transforming the transmission line of the small impedance value of the present invention as a dual transmission line

Figure pat00006

Figure pat00007

Figure pat00008

The capacitor value connected in parallel

Figure pat00009

The equations are

Figure pat00010
It is characterized by satisfying the conditions.

The asymmetrical power divider according to the present invention is implemented as a microstrip line.

The technical problem solved by the present invention is that a conventional asymmetric power divider cannot be designed because it can not implement a low impedance when using the microstrip technology, but by implementing a low impedance transmission line as a modified dual transmission line has a high power ratio There is an advantage to provide an asymmetrical power divider.

1 is a view showing an asymmetric power divider according to the present invention.
2 is an exemplary diagram of transforming a transmission line having a low impedance according to the present invention into a dual transmission line structure.
3 is a circuit diagram of an asymmetric power divider according to the present invention.
Figure 4 is a graph showing the S-parameter characteristics of a conventional 5: 1 asymmetric power divider.
5 is a graph showing the S-parameter characteristics of the asymmetric power divider according to the present invention.
6 is a diagram illustrating an implementation example of an asymmetric power divider according to the present invention.

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

First, the present invention is implemented in a design scheme different from that of a conventional asymmetric power divider. The asymmetric power divider according to the present invention changes a low impedance transmission line into a dual transmission line using a design equation. By using a modified dual transmission line structure in which a long transmission line of the transmission line is connected to a high impedance transmission line and parallel capacitors on both sides, it is possible to provide an asymmetric power divider that can be implemented with an impedance value of a conventional asymmetric power divider. do.

As described above, the asymmetric power divider according to the present invention is configured to improve the problem that a transmission line having an impedance value that is too low is implemented when the power ratio of the output stage is increased.

1 is a view showing an asymmetric power divider according to the present invention, Figure 2 is an exemplary view for transforming a transmission line having a low impedance according to the present invention to a dual transmission line structure, Figure 3 is an asymmetric power divider according to the present invention Is a circuit diagram.

1 to 3 show the input impedance values of the asymmetric power divider and each transmission line according to the present invention, wherein the asymmetric power divider of the present invention (hereinafter referred to as "asymmetric power divider") has four impedances Z It has a λ / 4 transmission line with 01 , Z 02 , Z 03 and Z 04 and an isolation resistor R IC .

Here, the design equation for designing the asymmetric power divider according to the present invention can be calculated using Equations 1 to 5 as follows.

Figure pat00011

Figure pat00012

Figure pat00013

Figure pat00014

Figure pat00015

Here, the power distribution ratio is represented by k 2 .

In order to implement a 5: 1 asymmetric power divider, the impedances of the ports P1, P2, and P3 in the above equations are represented by R a = R b = R c = 50 ohm (Ω) and the characteristic impedance of Z o1 . Choose from 81.90 ohms available.

In this case, Z 02 = 16.38 ohms, Z 03 = 33.44 ohms, Z 04 is 14.95 ohms, and R IC has 26.83 ohms.

At this time, Z 01 has a characteristic impedance can be sufficiently implemented, but Z 02 , Z 03 , Z 04 impedance is too small to be implemented as a microstrip line, for example, as shown in FIG. It will be converted to transmission line.

Equation that can be implemented by transforming the transmission lines (Z 02 , Z 03 , Z 04 ) having a small impedance value into a dual transmission line can be calculated using Equations 6 to 8 below. In addition, a capacitor value connected in parallel with a long transmission line with a high impedance short transmission line may be calculated using Equation 9 below.

Figure pat00016

Figure pat00017

Figure pat00018

Figure pat00019

In the above equations

Figure pat00020
The conditions of

Figure 4 is a graph showing the S-parameter characteristics of a conventional 5: 1 asymmetric power divider, Figure 5 is a graph showing the S-parameter characteristics of an asymmetric power divider according to the present invention, of the asymmetric power divider according to the present invention It can be seen that the characteristics are shown to be equivalent to those of the conventional asymmetric power divider.

6 is a view showing an implementation of an asymmetric power divider according to the present invention, which shows an example of an implementation of a 5: 1 asymmetric power divider designed as described above.

As described above, the present invention converts the λ / 4 transmission line of the asymmetric power splitter implemented as a microstrip line into a transmission line having an electrical length smaller than π / 2 and a transmission line having a length longer than π / 2, Asymmetrical power splitters with a higher power ratio can be designed using an equivalent structure with transmission impedances longer than π / 2 less than the length of these transmission lines and with higher impedance than conventional transmission lines with capacitances connected in parallel. Will be.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. , Alteration, substitution, addition, or the like.

Claims (4)

In the asymmetrical power divider,
When the power distribution ratio between the output terminals increases, the design equation calculates and separates a transmission line having a large impedance value and a transmission line having a small impedance value,
The transmission line of the small impedance value is calculated and modified as a dual transmission line,
And a capacitor having a high power ratio by connecting a long transmission line among the modified transmission lines to a transmission line having a large impedance value in parallel to both sides.
The method of claim 1,
The design equation is
Figure pat00021

Figure pat00022

Figure pat00023

Figure pat00024

Figure pat00025

Here, k 2 is an asymmetrical power divider, characterized in that the power distribution ratio.
3. The method according to claim 1 or 2,
Equation for calculating and transforming the transmission line having a small impedance value as a dual transmission line
Figure pat00026

Figure pat00027

Figure pat00028

The capacitor value connected in parallel
Figure pat00029

The equations are
Figure pat00030
Asymmetrical power divider, characterized in that to satisfy the conditions of.
The method of claim 3, wherein
The transmission line
An asymmetrical power divider characterized by a microstrip line.
KR1020120054609A 2012-05-23 2012-05-23 Dual band unequal power divider KR20130130939A (en)

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