CN201017976Y - Broadband balun based on right-left hand composite transmission lines - Google Patents
Broadband balun based on right-left hand composite transmission lines Download PDFInfo
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- CN201017976Y CN201017976Y CNU200720107196XU CN200720107196U CN201017976Y CN 201017976 Y CN201017976 Y CN 201017976Y CN U200720107196X U CNU200720107196X U CN U200720107196XU CN 200720107196 U CN200720107196 U CN 200720107196U CN 201017976 Y CN201017976 Y CN 201017976Y
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- transmission line
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- power divider
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Abstract
The utility model discloses a wide band balun based on the left-handed and right-handed composite transmission line, which comprises a Wilkinson power divider and a phase shifter being composed of a right-handed transmission line and a left-handed and right-handed composite transmission line, the right-handed transmission line is connected with one output end of the Wilkinson power divider, and the left-handed and right-handed composite transmission line is connected with the other output end of the Wilkinson power divider, the left-handed and right-handed composite transmission line is formed by connecting the n left-handed and right-handed composite transmission line units in series, and each left-handed and right-handed composite transmission line unit is a T shape electric circuit consisting of two connected impedance units and an admittance unit connected at the connecting point of the two impedance units. The utility model has the advantages that the structure is simple, the cost is low, the size is small, a wider working band can be obtained, the insertion loss is low, the return loss is low and the isolation degree is high, and the utility model can be manufactured and integrated into microwave and millimeter wave electric circuit conveniently.
Description
Technical Field
The utility model relates to a balun, especially broadband balun based on compound transmission line of left and right hands.
Background
Balun is a three-port device, which can convert unbalanced single-ended signals into balanced differential signals, and is widely applied in feeding systems of microwave antennas such as dual-wire antennas and other radio frequency or microwave communications, satellite communications, wireless communications, and cable televisions.
Balun designs typically have both distributed transmission line and lumped parameter element types. Balun of the distributed transmission line type has a narrow bandwidth due to the frequency dependence on the transmission line itself, and cannot be made compact if a wide band is to be achieved. Lumped parameter element designs can be made very compact, but they can cause phase response mismatch in the low-pass and high-pass output lines.
At present, the known balun is generally of a Wilkinson structure and a T-shaped structure, but due to the linear dispersion relation of used elements, the balun has the defects of narrow working frequency band, low frequency, complex structure, large size and high manufacturing process requirement.
The operating band, size, mass size, structural complexity, low insertion loss, return loss and high isolation are factors that must be considered in designing a good balun. In order to expand the working band of balun, reduce the size and simplify the manufacturing process, many people have proposed some new design methods. For example, a miniaturized wilkinson structure power divider structure or a differential phase shifter adopting a double left-handed transmission line is adopted, but the bandwidth of the differential phase shifter can only reach 2: 1, and the bandwidth is not improved to a great extent.
Disclosure of Invention
The utility model aims at overcoming current balun and having the frequency band narrow, the structure is complicated, and the size is big, and the preparation process requires high not enough, provides one kind and has wide operating band, low insertion loss, high isolation, and is with low costs simultaneously, and the size is very little, be convenient for preparation and integrated be based on the broadband balun of controlling the compound transmission line of hand.
The utility model discloses a broadband balun based on compound transmission line of left and right hands, its characterized in that includes the Wilkinson merit and divides the ware and the phase shifter of constituteing by right hand transmission line and the compound transmission line of left and right hands, right hand transmission line links to each other with an output of Wilkinson merit, the compound transmission line of left and right hands links to each other with another output end of Wilkinson merit, the compound transmission line of left and right hands of saying is established ties by the compound transmission line unit of n left and right hands and forms, n =1,2, … positive integer, every left and right hands compound transmission line unit is by the T shape circuit that two continuous impedance unit and the admittance unit of connection department constitute at two impedance unit junctions, wherein, the impedance unit comprises right chirality inductance and left chirality electric capacity series connection, the admittance unit comprises the parallelly connected left chirality inductance of right chirality electric capacity.
The beneficial effects of the utility model reside in that: the composite transmission line has the advantages of wide working frequency band, low insertion loss, low return loss and high isolation, and simultaneously, because of the adoption of capacitance and inductance elements, the balun structure of the composite transmission line has the advantages of simple structure, low cost, small size, convenience in manufacturing and integration of microwave and millimeter wave circuits. Experiments show that the utility model discloses performance is good in the broadband within range, can make the bandwidth improve to 4.37: 1, consequently can do ideal feed to the planar device that needs broadband difference signal, for example to the feed of printing bow tie antenna or series connection feed dipole scanning array.
Drawings
FIG. 1 is a schematic diagram of a wideband balun based on a right-and-left handed composite transmission line;
FIG. 2 is a schematic diagram of a right and left handed composite transmission line element;
fig. 3 is a schematic diagram of the phase response performance of the broadband balun output port of the present invention; in the figure: 1 is a left-right hand composite transmission line, and 2 is a right-hand transmission line;
fig. 4 is a schematic bandwidth diagram of the phase difference stabilization of the broadband balun output ports of the present invention;
fig. 5 is a schematic diagram of the isolation and pass-through characteristics of the output ports of the broadband balun of the present invention; fig. 6 is a graphical representation of the return loss characteristics of the broadband balun ports of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, the present invention relates to a wideband balun based on left-right hand composite transmission line, including a wilkinson power divider 1 and a phase shifter composed of a right-hand transmission line 2 and a left-hand and right-hand composite transmission line 3, the right-hand transmission line 2 is connected to an output end of the wilkinson power divider 1, the left-hand and right-hand composite transmission line 3 is connected to another output end of the wilkinson power divider 1, the left-hand and right-hand composite transmission line 3 is formed by connecting n left-hand and right-hand composite transmission line units in series, n =1,2, … positive integer, each left-hand and right-hand composite transmission line unit is a T-shaped circuit composed of two connected impedance units Z and an admittance unit Y connected to a junction of the two impedance units, wherein the impedance unit Z is a right-handed inductance L and the admittance unit Y is connected to a junction of the two impedance units Z R And a left-handed capacitor C L Formed by series connection, the admittance unit Y is composed of a right-handed capacitor C R Parallel left-handed inductor L L And (4) forming.
When the phase shifter works, signals enter from the input end of the Wilkinson power divider and are output from the two output ends of the phase shifter.
Capacitor C corresponding to left-right hand composite transmission line unit R ，C L Inductance L R ，L L The initial value of (a) can be obtained by the following formula:
wherein phi is PRH，S ，φ CRLH，S The right-hand transmission line and the left-hand and right-hand composite transmission line respectively have a central working frequency omega s Time phase shift, N is the number of unit cascades of the left-hand and right-hand composite transmission lines, Z 0 Is the characteristic impedance of the transmission line. Initial parameter values of elements can be optimized to obtain final parameters after analog simulation by using an Agilent design system, and balun with fixed port phase difference in a wide frequency band is designed.
Broadband balun design example based on left-right hand composite transmission line: a wideband balun having a center frequency of 1.5GHz and a stable phase difference (180 DEG + -10 DEG) over a frequency band of 0.63GHz to 2.75GHz is designed, the balun having an absolute bandwidth of 2.12GHz and a frequency ratio bandwidth of 4.37: 1. The method is realized by adopting the structure of FIG. 1, wherein the number of the left-hand and right-hand composite transmission cascade units is selected to be N =10, and the central working frequency is ω S =2 pi 1.5GHz, and the characteristic impedance of the transmission line is Z 0 =50 Ω. Calculating an element initial value according to the group of formulas, performing analog simulation by using an Agilent design system, and optimizing to obtain: c R ＝1.82pF，L R ＝2.28nH，L L ＝54.49nH， C L ＝43.60pF，φ PRH，S And 3.51 pi. The phase response performance of a broadband balun output port designed using the above parameters is shown in fig. 3 and 4.
The isolation and pass-through characteristics of the output ports are given in fig. 5, where: s21 is a transmission coefficient between an input end of the Wilkinson power divider and an output end of the right-hand transmission line, S31 is a transmission coefficient between an input end of the Wilkinson power divider and an output end of the left-right-hand composite transmission line, and S23 is an isolation degree between an output end of the left-right-hand composite transmission line and an output end of the right-hand transmission line.
The amplitude response of the return loss for each of the 3 ports is given in fig. 6, where: s11 is the reflection coefficient of the input end of the Wilkinson power divider, S22 is the reflection coefficient of the output end of the right-handed transmission line, and S33 is the reflection coefficient of the output end of the left-handed and right-handed composite transmission line. As can be seen from fig. 4 to fig. 6, balun with this structure achieves stable phase difference at the output port in a wide bandwidth range, and also has the advantages of low insertion loss, low return loss, and high isolation.
Claims (1)
1. A broadband balun based on a left-right-hand composite transmission line is characterized by comprising a Wilkinson power divider (1) and a phase shifter consisting of a right-hand transmission line (2) and a left-right-hand composite transmission line (3), wherein the right-hand transmission line (2) is connected with one output end of the Wilkinson power divider (1), the left-right-hand composite transmission line (3) is connected with the other output end of the Wilkinson power divider (1), the left-right-hand composite transmission line (3) is formed by connecting n left-right-hand composite transmission line units in series, n =1,2, … positive integers, each left-right-hand composite transmission line unit is a T-shaped circuit consisting of two connected impedance units (Z) and an admittance unit (Y) connected at the joint of the two impedance units, and the impedance unit (Z) consists of a right chiral inductor (L) R ) And a left-handed capacitor (C) L ) Formed in series, the admittance unit (Y) is composed of a right-handed capacitor (C) R ) Parallel left hand inductor (L) L ) And (4) forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720107196XU CN201017976Y (en) | 2007-03-20 | 2007-03-20 | Broadband balun based on right-left hand composite transmission lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720107196XU CN201017976Y (en) | 2007-03-20 | 2007-03-20 | Broadband balun based on right-left hand composite transmission lines |
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| Publication Number | Publication Date |
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| CN201017976Y true CN201017976Y (en) | 2008-02-06 |
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| CNU200720107196XU Expired - Lifetime CN201017976Y (en) | 2007-03-20 | 2007-03-20 | Broadband balun based on right-left hand composite transmission lines |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101022182B (en) * | 2007-03-20 | 2010-04-07 | 浙江大学 | Wide band balun based on left-right-hand composite transmitting line |
| CN102324623A (en) * | 2011-08-31 | 2012-01-18 | 华南理工大学 | Dual-band biorthogonal phase output power division feed network |
| CN101674060B (en) * | 2008-09-10 | 2012-04-18 | 日月光半导体制造股份有限公司 | Barron device |
| CN110994107A (en) * | 2019-12-10 | 2020-04-10 | 重庆邮电大学 | Coplanar waveguide dual-frequency power divider based on crossed composite left-right-hand transmission line |
-
2007
- 2007-03-20 CN CNU200720107196XU patent/CN201017976Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101022182B (en) * | 2007-03-20 | 2010-04-07 | 浙江大学 | Wide band balun based on left-right-hand composite transmitting line |
| CN101674060B (en) * | 2008-09-10 | 2012-04-18 | 日月光半导体制造股份有限公司 | Barron device |
| CN102324623A (en) * | 2011-08-31 | 2012-01-18 | 华南理工大学 | Dual-band biorthogonal phase output power division feed network |
| CN102324623B (en) * | 2011-08-31 | 2014-05-28 | 华南理工大学 | Dual-band biorthogonal phase output power division feed network |
| CN110994107A (en) * | 2019-12-10 | 2020-04-10 | 重庆邮电大学 | Coplanar waveguide dual-frequency power divider based on crossed composite left-right-hand transmission line |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20080206 Effective date of abandoning: 20070320 |