CN108987868A - A kind of frequency-tunable planar Balun - Google Patents
A kind of frequency-tunable planar Balun Download PDFInfo
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- CN108987868A CN108987868A CN201810759094.9A CN201810759094A CN108987868A CN 108987868 A CN108987868 A CN 108987868A CN 201810759094 A CN201810759094 A CN 201810759094A CN 108987868 A CN108987868 A CN 108987868A
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- varactor
- line
- parallel coupled
- frequency
- coupled line
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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
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced with unbalanced lines or devices
Abstract
The invention discloses a kind of frequency-tunable planar Baluns, comprising: medium substrate；The first varactor load parallel coupled line, the second varactor load parallel coupled line and 50 Ω microstrip lines are provided on the medium substrate；The first varactor load parallel coupled line is connected with the second varactor load parallel coupled line, and the first varactor load parallel coupled line and the second varactor load parallel coupled line are connected with 50 Ω microstrip lines.A kind of frequency-tunable planar Balun provided by the invention can be realized working frequency and change with the capacitance difference of varactor, realize that the range of frequency-tunable is 103% and has perfect impedance matching, has the characteristics that easy processing, small in size and inexpensive simultaneously, suitable for being widely popularized.
Description
Technical field
The invention belongs to the microwave device field in electronic technology field, specially a kind of frequency-tunable planar Balun.
Background technique
Balun is a kind of important component in radio circuit, and unbalanced voltage condition signal can be converted to Differential Output letter by it
Number.Balun is widely used in wireless and mobile communication system, such as frequency multiplier, frequency mixer, push-pull power amplifier and antenna
Feeding network.Marchand has been put forward for the first time the coaxial transmission line barron structure based on TEM mould in nineteen forty-four, with microwave circuit
With the development of microwave integrated circuit, planar Balun is earned widespread respect and is studied, planar Balun have it is small in size, be easily integrated
Feature, most of planar Balun design to obtain according to Marchand balun.
With the development of wireless communication technique, got over for can be realized the demand of restructural communication system of multiband covering
Come more urgent, various restructural and adjustable microwave components of frequency have obtained extensive research and development.Such as power divider, filter
Wave device, coupler.The impedance matching of frequency-tunable planar Balun is poor in currently available technology, and wherein return loss is respectively less than
20dB, and frequency-tunable range is relatively narrow, adjustable relative bandwidth is less than 50%.
Summary of the invention
According to problem of the existing technology, the invention discloses a kind of frequency-tunable planar Baluns, comprising: medium base
Plate；The first varactor load parallel coupled line is provided on the medium substrate, the second varactor loads parallel coupling
Zygonema and 50 Ω microstrip lines；The first varactor load parallel coupled line and the second varactor load parallel coupling
Line is connected, and the first varactor load parallel coupled line and the second varactor load parallel coupled line and 50 Ω
Microstrip line is connected；The first varactor load parallel coupled line and the second varactor load parallel coupling knot
Structure is identical, and the first varactor load parallel coupled line includes the first microstrip line, the second microstrip line, two pole of the first transfiguration
The second varactor of pipe and third varactor, first varactor and the second varactor are connected across described
Between first microstrip line and the second microstrip line；The third varactor is connected across between the first microstrip line and ground；Described
Three varactors are connected across between the second microstrip line and ground；Second varactor and third varactor are set to
The middle part of first varactor load parallel coupled line；The 50 Ω microstrip line includes input microstrip line, the first output micro-strip
Line, the second output microstrip line.
The input microstrip line is connected with one end of the first varactor load parallel coupled line；First output
Microstrip line is connected with one end of the first varactor load parallel coupled line；The second output microstrip line and the second transfiguration
One end of diode load parallel coupled line is connected；One end and second of the first varactor load parallel coupled line
One end of varactor load parallel coupled line is connected.
The electrical length of first microstrip line and the second microstrip line is the frequency-tunable planar Balun highest tuned frequency
The 1/4 of corresponding wavelength；Distance between first varactor and the second varactor is the frequency-tunable plane
The 1/12 of balun highest tuned frequency corresponding wavelength.
By changing the capacitance of first varactor, the second varactor and third varactor to frequency
Rate carries out tunable control.
By adopting the above-described technical solution, a kind of frequency-tunable planar Balun provided by the invention can be realized work
Frequency is different with the capacitance of varactor and changes, and the range for realizing frequency-tunable is 103% and has perfect resistance
Anti- matching, while having the characteristics that easy processing, small in size and inexpensive, suitable for being widely popularized.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of frequency-tunable planar Balun of the present invention；
Fig. 2 is curve graph of the frequency-tunable planar Balun return loss of the present invention with capacitance variation；
Fig. 3 between frequency-tunable planar Balun output port of the present invention amplitude difference with capacitance variation curve
Figure；
Fig. 4 between frequency-tunable planar Balun output port of the present invention phase difference with capacitance variation curve
Figure；
In figure: 1, medium substrate, the 2, first varactor load parallel coupled line, and the load of the 3, first varactor is flat
Row coupling line, 4,50 Ω microstrip lines, the 21, first microstrip line, the 22, second microstrip line, the 23, first varactor A, 24, third
Varactor A, the 25, second varactor, 26, third varactor B, the 27, first varactor B, 41, input it is micro-
Band line, the 42, first output microstrip line, the 43, second output microstrip line.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, with reference to the attached drawing in the embodiment of the present invention, to this
Technical solution in inventive embodiments carries out clear and complete description:
A kind of frequency-tunable planar Balun as shown in Figure 1, it is characterised in that including medium substrate 1；The medium base
The first varactor load parallel coupled line 2, the second varactor load Ω of parallel coupled line 3 and 50 are provided on plate 1
Microstrip line 4；The first varactor load parallel coupled line 2 and the second varactor load 3 structure of parallel coupled line
It is identical.Wherein the first varactor 23-27 includes the first varactor A 23 and the first varactor B 27.Third becomes
Holding diode 24-26 includes third varactor A 24 and third varactor B 26.
The first varactor load parallel coupled line 2 includes the first microstrip line 21, the change of the second microstrip line 22, first
Hold diode A23, the first varactor 27, two pole of the second varactor 25, third varactor 24 and third transfiguration
Pipe B26.The 50 Ω microstrip line 4 includes that input microstrip line 41, first exports the output microstrip line 43 of microstrip line 42, second.Into one
Step ground, the 50 Ω microstrip line 41 are connect with the end A of the first varactor load parallel coupled line 2；The 50 Ω microstrip line
42 connect with the end B of the first varactor load parallel coupled line 2；The 50 Ω microstrip line 43 adds with the second varactor
Carry the C-terminal connection of parallel coupled line 3；The end D of the first varactor load parallel coupled line 2 and the second varactor
Load the end the F connection of parallel coupled line 3.Further, the electrical length of first microstrip line 21 and the second microstrip line 22 is institute
State the 1/4 of frequency-tunable planar Balun highest tuned frequency corresponding wavelength.The first varactor 23-27 and second becomes
Hold diode 25 to be connected across between first microstrip line 21 and the second microstrip line 22；The third varactor 24 is connected across
Between first microstrip line 21 and ground；The third varactor B26 is connected across between the second microstrip line 22 and ground；Described second
Varactor 25 and third varactor 24-26 are placed in the middle part of the first varactor load parallel coupled line 2；It is described
Distance between first varactor 23-27 and the second varactor 25 is frequency-tunable planar Balun highest tuning
The 1/12 of frequency corresponding wavelength.Further, by changing the first varactor A23, the first varactor 27, the
The capacitance of two varactors 25, third varactor 24 and third varactor B26 realizes frequency-tunable.
Medium substrate 1 of the present invention is used to support the first varactor load parallel coupled line 2, two pole of the second transfiguration
Pipe loads the Ω of parallel coupled line 3 and 50 microstrip line 4；The first varactor 23-27 capacitance is C1, two pole of the second transfiguration
The capacitance of pipe 25 is C2, the capacitance of third varactor 24-26 is C3；The frequency-tunable planar Balun can be real
Existing working frequency is different with the capacitance of varactor and changes, and realizes frequency-tunable, while having easy processing, small in size
With low cost feature, suitable for being widely popularized.
Specific embodiments of the present invention are described below.
The frequency adjustable extent of the present embodiment frequency-tunable planar Balun is 0.8~2.5GHz, Coupled Miccrostrip Lines
Even mode impedance be 120.7 Ω, odd mode impedance is 77.3 Ω.
By the capacitance C for adjusting the first varactor, the second varactor, third varactor1、C2、C3It is real
Existing frequency-tunable, the capacitance of varactor and the centre frequency corresponding relationship of tuning are as shown in the table:
Fig. 2 shows the invention frequency-tunable planar Balun return losses with the curve graph of capacitance variation,
In the frequency range of 0.8GHz to 2.5GHz, return loss is all larger than 50dB at the centre frequency of tuning.Fig. 3 shows this hair
Between the bright frequency-tunable planar Balun output port amplitude difference with capacitance variation curve graph, in 0.8GHz to 2.5GHz
Frequency range in, between output port at the centre frequency of tuning amplitude difference be 0dB.Fig. 4 shows frequency of the present invention
Between tunable planar Balun output port phase difference with capacitance variation curve graph, in the frequency range of 0.8GHz to 2.5GHz
Interior, phase difference is 180 ° between output port at the centre frequency of tuning.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (4)
1. a kind of frequency-tunable planar Balun, characterized by comprising: medium substrate (1)；It is arranged on the medium substrate (1)
There are the first varactor load parallel coupled line (2), the second varactor load parallel coupled line (3) and 50 Ω microstrip lines
(4)；First varactor load parallel coupled line (2) is connected with the second varactor load parallel coupled line (3)
It connects, the first varactor load parallel coupled line (2) and the second varactor load parallel coupled line (3) and 50 Ω
Microstrip line (4) is connected；First varactor loads parallel coupled line (2) coupling parallel with the load of the second varactor
Zygonema (3) structure is identical, and first varactor load parallel coupled line (2) includes the first microstrip line (21), second micro-
Band line (22), the first varactor (23-27), the second varactor (25) and third varactor (24-26), institute
It states the first varactor (23-27) and the second varactor (25) is connected across first microstrip line (21) and second micro-
Between band line (22)；The third varactor (24) is connected across between the first microstrip line (21) and ground；The third transfiguration
Diode (26) is connected across between the second microstrip line (22) and ground；Second varactor (25) and third varactor
(24-26) are set to the middle part of the first varactor load parallel coupled line (2)；The 50 Ω microstrip line (4) includes input
Microstrip line (41), the first output microstrip line (42) and the second output microstrip line (43).
2. frequency-tunable planar Balun according to claim 1, it is characterised in that: the input microstrip line (41) and the
One end of one varactor load parallel coupled line (2) is connected；First output microstrip line (42) and the first transfiguration two
One end of pole pipe load parallel coupled line (2) is connected；Second output microstrip line (43) and the second varactor load
One end of parallel coupled line (3) is connected；One end of first varactor load parallel coupled line (2) and the second transfiguration
One end of diode load parallel coupled line (3) is connected.
3. frequency-tunable planar Balun according to claim 1, it is characterised in that: first microstrip line (21) and
The electrical length of two microstrip lines (22) is the 1/4 of the frequency-tunable planar Balun highest tuned frequency corresponding wavelength；Described first
Distance between varactor (23-27) and the second varactor (25) is the frequency-tunable planar Balun most lofty tone
The 1/12 of harmonics rate corresponding wavelength.
4. frequency-tunable planar Balun according to claim 1, which is characterized in that by changing first transfiguration two
The capacitance of pole pipe (23-27), the second varactor (25) and third varactor (24-26) carries out frequency adjustable
Humorous control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810759094.9A CN108987868A (en) | 2018-07-11 | 2018-07-11 | A kind of frequency-tunable planar Balun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810759094.9A CN108987868A (en) | 2018-07-11 | 2018-07-11 | A kind of frequency-tunable planar Balun |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110545085A (en) * | 2019-09-10 | 2019-12-06 | 大连海事大学 | Frequency and load impedance tunable complex impedance converter |
| CN110994109A (en) * | 2019-12-31 | 2020-04-10 | 南通大学 | Compact full-balanced broadband filtering power divider |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852112B (en) * | 2015-03-26 | 2018-08-03 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | A kind of frequency and the restructural hybrid coupler and its design method of phase |
-
2018
- 2018-07-11 CN CN201810759094.9A patent/CN108987868A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852112B (en) * | 2015-03-26 | 2018-08-03 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | A kind of frequency and the restructural hybrid coupler and its design method of phase |
Non-Patent Citations (2)
| Title |
|---|
| CHING-IAN SHIE等: ""Design of a New Type Planar Balun by Using Trans-Directional Couplers"", 《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》 * |
| 刘宏梅: ""横跨定向耦合器的设计方法与应用研究"", 《中国博士学位论文全文数据库（电子期刊）》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110545085A (en) * | 2019-09-10 | 2019-12-06 | 大连海事大学 | Frequency and load impedance tunable complex impedance converter |
| CN110545085B (en) * | 2019-09-10 | 2023-02-10 | 大连海事大学 | Frequency and load impedance tunable complex impedance converter |
| CN110994109A (en) * | 2019-12-31 | 2020-04-10 | 南通大学 | Compact full-balanced broadband filtering power divider |
| CN110994109B (en) * | 2019-12-31 | 2021-05-25 | 南通大学 | Compact full-balanced broadband filtering power divider |
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Application publication date: 20181211 |
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