CN105720345B - Highly selective broadband coupler in crossing shape - Google Patents
Highly selective broadband coupler in crossing shape Download PDFInfo
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- CN105720345B CN105720345B CN201610060814.3A CN201610060814A CN105720345B CN 105720345 B CN105720345 B CN 105720345B CN 201610060814 A CN201610060814 A CN 201610060814A CN 105720345 B CN105720345 B CN 105720345B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 101
- 230000008878 coupling Effects 0.000 claims abstract description 72
- 238000010168 coupling process Methods 0.000 claims abstract description 72
- 238000005859 coupling reaction Methods 0.000 claims abstract description 72
- 239000002184 metal Substances 0.000 claims abstract description 20
- 239000000758 substrate Substances 0.000 claims description 13
- 238000010276 construction Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 7
- 238000002955 isolation Methods 0.000 abstract description 5
- 238000003780 insertion Methods 0.000 abstract description 4
- 230000037431 insertion Effects 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 5
- 238000011068 loading method Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000006880 cross-coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a kind of highly selective broadband coupler in crossing shape, include four pairs and identical be connected to input, traditional coupling line at output port, any one transmission lines in each pair of coupling line are sequentially connected to form an inner ring, other four transmission lines one end connection input, output port, the short circuit branch line that the other end has been connected identical respectively, it slots on the ground immediately below this four pairs of coupling lines, and slot is built-in with sheet metal, and the coefficient of coup is improved and restrained effectively second harmonic.Due to the rotational symmetry of structure, easily using second order analysis method of odd-even model analysis circuit and corresponding parameter value can be obtained.For the bandwidth of this coupler in crossing shape more than 27.5%, return loss is more than 20 dB, and isolation is more than 13.5 dB and is less than 1.6 dB with interior Insertion Loss, compact-sized, design is simple, good electrical property, it is easy to realize integrated with other plane microwave millimetre-wave circuits and system.
Description
Technical field
The invention belongs to microwave and millimeter wave mixing plane integrated circuit, particularly a kind of cross coupling in highly selective broadband
Clutch.
Background technology
Coupler in crossing shape is an important passive device in microwave integrated circuit, it causes transmission path to there is interconnection
Two paths of signals can be mutually isolated, be transmitted without interfering with each other.For an ideal coupler in crossing shape, adjacent end
Mouth has good isolation, the lossless transmission in opposite port.Past realizes frequently with this most straightforward approach of three-dimensional structure, such as
Air bridges, sealing wire.But this method is of high cost, it is complicated.Have been designed that perhaps multilevel single-frequency/double frequency now
The loading of coupler in crossing shape, loop configuration and branch line is most commonly seen, such as document 1 (" Y.Chen and S.-P.Yeo, A
symmetrical four-port microstrip coupler for crossover application,”IEEE
Trans.Microw.Theory Tech.,vol.55,no.11,pp.2434–2438,Nov.2007."), document 2 (" F.Lin,
Q.-X.Chu,and S.W.Wong,Dual-band planar crossover with two-section branch-line
structure,IEEE Trans.Microw.Theory Techn.,vol.61,no.6,pp.2309-2316,
") and (" He Zhu, Yifan Wang, Amin M.Abbosh, the Broadband microwave of document 3 Jun.2013.
crossover using parallel-coupled microstrip lines and short-ended stubs,IET
Microw.Antennas Propag., 2015, vol.9, Iss.1, pp.79-85. "), different structure is all described in detail
Coupler in crossing shape, although cascade structure has widened bandwidth, also increase the size of circuit, insertion loss becomes larger.These
Problem can be solved by patch resonator of different shapes, two-sided structure or micro-strip-line of rabbet joint/co-planar waveguide transition structure, such as
(" W.Liu, Z.Zhang, Z.Feng, M.Iskander, A compact the wideband micro-strip of document 4
Crossover, IEEE Microw.Wirel.Compon.Lett., 2012,22, (5), pp.254-256. ") and document 5
(“B.Henin,A.Abbosh,Design of a compact planar crossover using Sierpinski
Carpet micro strip patch, IET Microw.Antennas Propag., 2013,7, (1), pp.54-60. "),
Coupler in crossing shape all than describing several miniaturizations in more detail.In addition, multi-functional circuit structure also has further investigation,
Such as (" X.Y.Zhang, Q.-Y.Guo, K.-X.Wang, B.-J.Hu, and H.L.Zhang, the Compact filtering of document 6
crossover using stub-loaded ring resonator,IEEE Microw.Wireless Compon.Lett.,
vol.24,no.5,pp.327–329,May 2014.”)。
But some narrower bandwidths of above structure, some selectivity are poor, it is impossible to meet broadband and highly selective needs.
Invention content
The object of the present invention is to provide a kind of highly selective broadband coupler in crossing shape.
Realize the object of the invention technical solution be：A kind of highly selective broadband coupler in crossing shape, including upper
Layer microstrip line construction and the slot line structure of lower floor, wherein first network port, second network port, the third network port and the 4th
The network port is connected respectively with four the first microstrip lines, and four network ports are located at four sides on medium substrate upper strata respectively, and close
In overall structure center rotational symmetry；
It is identical by four pairs between first network port, second network port, the third network port and the 4th network port
The first coupling line be connected, the first transmission line in the first coupling line is sequentially connected to form an inner ring, in the first coupling line
Second transmission line one end is connected with corresponding first microstrip line, and the other end is connected with corresponding second microstrip line, the second microstrip line
End be grounded by corresponding metal throuth hole, the width of first transmission line and second transmission line is equal, first transmission line,
The length of two transmission lines and the second microstrip line is quarter-wave, and the first coupling line, the second microstrip line and metal throuth hole are equal
About overall structure center rotational symmetry；
Four pairs of second identical coupling lines are connected in parallel on the first microstrip line and corresponding first transmission line junction respectively, and second
Third transmission line in coupling line and the 4th transmission line width are equal, and length is quarter-wave, four pair of second coupling line
About overall structure center rotational symmetry；First microstrip line and first transmission line junction third microstrip line in parallel, third
The length of microstrip line is half-wavelength, and four third microstrip lines are about overall structure center rotational symmetry；The lower floor of dielectric-slab
5th transmission line is located in the corresponding line of rabbet joint, and the length of the line of rabbet joint is quarter-wave, and every the 5th transmission line with per bar groove
Line is symmetrical about the first coupling line short side line of symmetry, and four article of the 5th transmission line is with the line of rabbet joint about overall structure center rotational symmetry.
Compared with prior art, the present invention its remarkable advantage is：(1) coupler of the invention using loading coupling line and
Half-wavelength open-circuit line causes band to produce four transmission zeros outside, improves the selectivity of passband both sides, upper stopband extends to
2.95f0(f0Centered on frequency)；(2) introduce the broadside coupled structure of groove profile on the earth plate of coupling line, i.e., coupling line just under
The Fang Youyi line of rabbet joint, and one piece of sheet metal is etched in the line of rabbet joint, the coefficient of coup of corresponding coupling line is not only increased, and have
Inhibit second harmonic to effect；(3) 5 transmission poles are produced in band, band-pass behavior is good, and bandwidth has reached 27.5%.
The present invention is described in further detail below in conjunction with the accompanying drawings.
Description of the drawings
Fig. 1 is the superstructure schematic diagram of the highly selective broadband coupler in crossing shape of the present invention.
Fig. 2 is the understructure schematic diagram of the highly selective broadband coupler in crossing shape of the present invention.
Fig. 3 is the structure diagram of the first coupling line (2) of the highly selective broadband coupler in crossing shape of the present invention.
Fig. 4 is the structure diagram of the second coupling line (4) of the highly selective broadband coupler in crossing shape of the present invention.
Fig. 5 is the 3D structure diagrams of the highly selective broadband coupler in crossing shape of the present invention.
Fig. 6 is the result figure of transmission and the isolation of the highly selective broadband coupler in crossing shape of the present invention.
Specific embodiment
The invention discloses a kind of highly selective broadband coupler in crossing shape, including upper strata microstrip line construction and lower floor
Slot line structure, wherein first network port P1, the second network port P2, third network port P3 and the 4th network port P4 difference
It is connected with four the first microstrip lines 1, four network ports are located at four sides on medium substrate upper strata respectively, and about in overall structure
Heart rotational symmetry；
Pass through between first network port P1, the second network port P2, third network port P3 and the 4th network port P4
Four pairs of first identical coupling lines 2 are connected, and the first transmission line 2-1 in the first coupling line 2 is sequentially connected to form an inner ring, the
Second transmission line 2-2 one end in one coupling line 2 is connected with corresponding first microstrip line 1, the other end and corresponding second micro-strip
Line 3 is connected, and the end of the second microstrip line 3 is grounded by corresponding metal throuth hole 8, first transmission line 2-1 and second transmission line
The width of 2-2 is equal, and the length of first transmission line 2-1, second transmission line 2-2 and the second microstrip line 3 is quarter-wave,
First coupling line 2, the second microstrip line 3 and metal throuth hole 8 are about overall structure center rotational symmetry；
Four pairs of second identical coupling lines 4 are connected in parallel on the first microstrip line 1 and corresponding first transmission line 2-1 connections respectively
Locating, the third transmission line 4-1 and the 4th transmission line 4-2 width in the second coupling line 4 are equal, and length is quarter-wave,
Four pair of second coupling line 4 is about overall structure center rotational symmetry；First microstrip line 1 and first transmission line 2-1 junctions are simultaneously
Third microstrip line 5 is joined, the length of third microstrip line 5 is half-wavelength, and four third microstrip lines 5 are revolved about overall structure center
Turn symmetrical；5th transmission line 7 of the lower floor of dielectric-slab is located in the corresponding line of rabbet joint 6, and the length of the line of rabbet joint 6 is quarter-wave,
And every the 5th transmission line 7 and every line of rabbet joint 6 are symmetrical about 2 short side line of symmetry of the first coupling line, four article of the 5th transmission line 7 and slot
Line 6 is about overall structure center rotational symmetry.
Each pair of first coupling line 2 is equal including two width, and length is quarter-wave first transmission line
2-1 and second transmission line 2-2, four pair of first coupling line 2 is about overall structure center rotational symmetry.
Each pair of second coupling line 4 is equal including two width, and length is quarter-wave third transmission line
4-1 and the 4th transmission line 4-2, wherein, third transmission line 4-1 one end is connected with the first microstrip line 1, and other end open circuit, the 4th passes
Defeated line 4-2 connects in third transmission line 4-1 and the first microstrip line 1 connected one end open circuit, the other end with the 6th transmission line 4-3,
6th transmission line 4-3 is grounded by metal throuth hole 9.
Four the first microstrip lines 1 are respectively provided with equal length and width, and impedance value is equal to 50 ohm.
The first transmission line 2-1, second transmission line 2-2, the second microstrip line 3, third transmission line 4-1 and the 4th transmission line
The equal length of 4-2, the line of rabbet joint 6 are quarter-wave, the width phase of wherein first transmission line 2-1 and second transmission line 2-2
Deng third transmission line 4-1 is equal with the width of the 4th transmission line 4-2.
The dielectric constant of medium substrate is 2~16, and the height of medium substrate is 0.1~3mm.
There is no limit need to only ensure that its length is distinguished for the bending of second coupling line 4, the second microstrip line 3 and third microstrip line 5
For quarter-wave, quarter-wave and half-wavelength.
It is described in more detail below：
The present invention is a kind of highly selective broadband coupler in crossing shape, and open/short is loaded using in input, output terminal
Coupling line and open circuit minor matters, band produce four transmission zeros outside, improve the selectivity at passband both ends and improve resistance
Band performance.Also, under the action of them and short-circuit minor matters, there are 5 transmission poles with interior, with interior functional.In coupling
The broadside coupled structure of groove profile is introduced on the earth plate of zygonema, i.e., has a line of rabbet joint, and etched in the line of rabbet joint immediately below coupling line
Go out one piece of sheet metal, not only increase the coefficient of coup of coupling line, and restrained effectively second harmonic.Due to the coefficient of coup
Raising so that bandwidth becomes larger, the bandwidth of this structure has reached more than 27.5%, and interport isolation is more than 13.5dB, and structure is tight
It gathers, design simple, good electrical property, network structure is balanced in order to provide a kind of more practical planar broad band multiport.
With reference to Fig. 1 and Fig. 2, the present invention is a kind of highly selective broadband coupler in crossing shape, including upper strata micro-strip knot
Structure and the slot line structure of lower floor, wherein first network port, second network port, the third network port and the 4th network port point
It is not connected with four microstrip lines 1, four network ports are located at four sides on medium substrate upper strata respectively, and about overall structure center
Symmetrically.It is identical by four pairs between first network port, second network port, the third network port and the 4th network port
Coupling line 2 be connected, the first transmission line in coupling line 2 is sequentially connected to form an inner ring, the second transmission line in coupling line 2
One end is connected with microstrip line 1, and the other end is connected with quarter-wave microstrip line 3, and the end of microstrip line 3 passes through metal throuth hole
8 ground connection, the microstrip line 5 of four pairs of identical coupling lines 4 and half-wavelength are connected in parallel on microstrip line 1 and first transmission line junction, and coupling
Zygonema 2, microstrip line 3, metal throuth hole 8, coupling line 4 and microstrip line 5 are about overall structure center rotational symmetry.
Four transmission zeros are produced by loading open/short coupling line and open circuit minor matters, two of which is located at 0.5f0
And 1.5f0(f0Centered on frequency) at, other two position can be obtained by formula (1)：
Formula (1) shows the position of the two transmission zeros only by the parity mode impedance of the open/short coupling line loaded
It determines, then 0.5f0And 1.5f0The zero at place is as caused by the open-circuit line of half-wavelength.
There are the 5th transmission line and the line of rabbet joint in the lower floor of dielectric-slab and the 5th transmission line is located in the line of rabbet joint, and the length of sinual costa is
Quarter-wave, every the 5th transmission line is symmetrical about 2 short side line of symmetry of the first coupling line with every line of rabbet joint, four article of the 5th biography
Defeated line is with the line of rabbet joint about overall structure center rotational symmetry.There are two limitations for traditional coupling line.First, on the coefficient of coup has
Limit, this is because practical PCB processing technologys cannot be guaranteed too small line width and gap precision；Second is that parity mode phase velocity difference is led
The second harmonic of cause.The present invention solves both of these problems by slotting immediately below coupling line and sheet metal being etched in slot.
For a simple coupling line, the characteristic impedance of even mould depends primarily on the capacitance of microstrip line over the ground, the feature of strange mould
Impedance depends primarily on the capacitance of coupling line and microstrip line over the ground.It is even it can be seen from the electric field distribution of improved coupling line
The capacitance of mould reduces, impedance increase；The capacitance increase of strange mould, odd mode impedance reduce.Therefore, it is achieved close coupling.Adjust this
Arbitrary parameter value in invention can to drop to -20dB at second harmonic, but its spike still has.And improved coupling
Line eliminates this spike, produces the 5th zero outside band.
The present invention is a kind of highly selective broadband coupler in crossing shape, and the microstrip line 1 of four network ports of connection has
Equal length and width, impedance value are equal to 50 ohm.First transmission line, second transmission line, microstrip line 3, third transmission
Line and the 4th transmission line, the equal length of the line of rabbet joint are the width of quarter-wave, wherein first transmission line and second transmission line
Spend equal, third transmission line is equal with the width of the 4th transmission line.Coupling line 2, microstrip line 3, coupling line 4, microstrip line 5, the line of rabbet joint
6th, the 5th transmission line, metal throuth hole 8 and metal throuth hole 9 are about overall structure center rotational symmetry.The dielectric of medium substrate is normal
Number is 2~16, and the height of medium substrate is 0.1~3mm.
There is no limit only need to ensure that its length is respectively quarter-wave for the bending of coupling line 4, microstrip line 3 and microstrip line 5
Long, quarter-wave and half-wavelength.
With reference to embodiment, the present invention will be further described in detail：
The present invention is a kind of highly selective broadband coupler in crossing shape, employs toroidal cavity resonator and cascade structure, is led to
Cross loading coupling line and open circuit, short-circuit minor matters realized with interior 5 transmission poles and with outer 4 transmission zeros, coupling line just under
Side's fluting simultaneously etches the coefficient of coup that sheet metal improves coupling line in slot, it is suppressed that second harmonic, and produced at two frequencys multiplication
A zero is given birth to.The size of medium substrate is 56mm*56mm*0.508mm, and the dielectric constant of medium substrate is 2.65, medium
Double-layer structure above and below substrate point.Selected coupler in crossing shape is operated in S-band, working frequency range 1.94-2.545GHz, center
The a length of 23.2mm of quarter-wave of frequency, the width of 50 ohm of the microstrip line 1 connected at six ports are 1.38mm, length
For 16mm, 2 gap of coupling line is 0.21mm, and the wherein width of first transmission line and second transmission line is 0.19mm, and length is
24mm, 4 gap of coupling line are 0.19mm, and wherein third transmits line width as 0.2mm, length 23.7mm, the 4th transmission line
Width is 0.2mm, and length 23.42mm, the width of microstrip line 3 is 0.91mm, length 23.55mm, is connected to 1 He of microstrip line
The width of microstrip line 5 between coupling line 2 be 0.21mm, length 46.5mm, the metal throuth hole 8 being connected with microstrip line 3 and
The diameter of metal throuth hole 9 being connected with the 6th transmission line is 0.6mm, and the width of the line of rabbet joint 6 is 0.6mm, length 23.12mm,
The width of 5th transmission line is 0.2mm, length 22.52mm.
It will be appreciated from fig. 6 that when two paths of signals is inputted in 1 (3) port and 2 (4) ports, 5 zeros outside band effectively realize
Stopband Performance simultaneously extends to 2.95f0, have good transmission characteristic and low insertion loss, and bandwidth increases to 27.5% in, phase
Neighboring terminal mouth is isolated in entire frequency range both greater than 13.5dB.
It is the design method of the highly selective broadband coupler in crossing shape and specific example design above, this is cross
Coupler employs open/short coupling line and open circuit minor matters, realizes with outer 4 transmission zeros, on the ground fluting and
Etching sheet metal improves the coefficient of coup of coupling line, and restrained effectively second harmonic in slot, and the 5th is generated at two frequencys multiplication
A zero, the relative bandwidth which is realized have 27.5%, and design is simple, and practicability is stronger.Test present invention design example
The result shows that：5 transmission zeros are located at 1.16GHz, 1.78GHz, 2.83GHz, 3.52GHz, 4.68GHz respectively, and 3dB is opposite
Bandwidth has been extended to 27.7%, and the insertion loss in extends to 2.95f less than 1.6dB, upper stopband0And more than 25dB, isolation
Degree is both greater than 13.5dB in entire frequency range.Total volume is 56mm*56mm*0.508mm, and weight is less than 140 grams.
Claims (5)
- A kind of 1. highly selective broadband coupler in crossing shape, which is characterized in that the slot including upper strata microstrip line construction and lower floor Cable architecture, wherein first network port (P1), second network port (P2), the third network port (P3) and the 4th network port (P4) be connected respectively with four the first microstrip lines (1), four network ports respectively be located at medium substrate upper strata four sides, and about Overall structure center rotational symmetry；Between first network port (P1), second network port (P2), the third network port (P3) and the 4th network port (P4) It is connected by four pairs of identical first coupling lines (2), each pair of first coupling line (2) includes first transmission line (2-1), four pairs the The first transmission line (2-1) of one coupling line is sequentially connected to form an inner ring, the second transmission line in each pair of first coupling line (2) (2-2) one end is connected with corresponding first microstrip line (1), and the other end is connected with corresponding second microstrip line (3), the second microstrip line (3) end is grounded by corresponding metal throuth hole (8), the width phase of first transmission line (2-1) and second transmission line (2-2) Deng, the length of first transmission line (2-1), second transmission line (2-2) and the second microstrip line (3) is quarter-wave, and first Coupling line (2), the second microstrip line (3) and metal throuth hole (8) are about overall structure center rotational symmetry；Four pairs of identical second coupling lines (4) are connected in parallel on the first microstrip line (1) and are connected with corresponding first transmission line (2-1) respectively Locate, the third transmission line (4-1) and the 4th transmission line (4-2) width in the second coupling line (4) are equal, and length is a quarter Wavelength, four pair of second coupling line (4) is about overall structure center rotational symmetry；First microstrip line (1) and first transmission line (2-1) Junction is third microstrip line (5) in parallel, and the length of third microstrip line (5) is half-wavelength, and four third microstrip lines (5) are closed In overall structure center rotational symmetry；5th transmission line (7) of the lower floor of dielectric-slab is in the corresponding line of rabbet joint (6), the line of rabbet joint (6) Length for quarter-wave, and every the 5th transmission line (7) and every line of rabbet joint (6) are respectively short about the first coupling line (2) Side line of symmetry is symmetrical, and four article of the 5th transmission line (7) is with the line of rabbet joint (6) about overall structure center rotational symmetry.
- 2. according to the highly selective broadband coupler in crossing shape described in claim 1, which is characterized in that described each pair of first Coupling line (2) is equal including two width, and length is quarter-wave first transmission line (2-1) and second transmission line (2-2), four pair of first coupling line (2) is about overall structure center rotational symmetry.
- 3. according to the highly selective broadband coupler in crossing shape described in claim 1, which is characterized in that described each pair of second Coupling line (4) is equal including two width, and length is quarter-wave third transmission line (4-1) and the 4th transmission line (4-2), wherein, third transmission line (4-1) one end is connected with the first microstrip line (1), other end open circuit, the 4th transmission line (4-2) It opens a way in one end that third transmission line (4-1) is connected with the first microstrip line (1), the other end is connected with the 6th transmission line (4-3), the Six transmission lines (4-3) are grounded by metal throuth hole (9).
- 4. the highly selective broadband coupler in crossing shape according to claim 1 or 3, which is characterized in that four first micro- Equal length and width is respectively provided with line (1), impedance value is equal to 50 ohm.
- 5. highly selective broadband coupler in crossing shape according to claim 1 or 2, which is characterized in that medium substrate Dielectric constant is 2~16, and the height of medium substrate is 0.1~3mm.
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| CN201610060814.3A CN105720345B (en) | 2016-01-28 | 2016-01-28 | Highly selective broadband coupler in crossing shape |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602198A (en) * | 2016-11-29 | 2017-04-26 | 南京理工大学 | Three-frequency band branch line coupler based on short circuit parallel coupled lines |
| CN106602197A (en) * | 2016-11-29 | 2017-04-26 | 南京理工大学 | Short-circuit parallel coupling line-based three-frequency cross-shaped coupler |
| CN112186342B (en) * | 2020-10-27 | 2022-05-03 | 南通大学 | Dual-polarized dual-band dielectric filter antenna |
| CN112768864B (en) * | 2020-12-28 | 2022-02-01 | 杭州电子科技大学 | Microstrip-slot line coupled dual-band 90-degree directional coupler |
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2016
- 2016-01-28 CN CN201610060814.3A patent/CN105720345B/en not_active Expired - Fee Related
Non-Patent Citations (4)
| Title |
|---|
| Broadband microwave crossover using parallelcoupled microstrip lines and short-ended stubs;He Zhu等;《IET Microw. Antennas Propag.,》;20141229;第79-85页 * |
| Compact planar dual-band crossover using two-section branch-line coupler;Z.-W. Lee等;《ELECTRONICS LETTERS》;20121018;全文 * |
| High Selectivity Wideband Filtering Crossover Using Stub-Loaded Ring Resonators;Chaoying Zhao等;《2016 IEEE International Conference on Microwave and Millimeter Wave Technology (ICMMT)》;20160608;全文 * |
| Microstrip Branch-Line Couplers for Crossover Application;Jijun Yao等;《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》;20101022;第87-92页 * |
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