CN106602198A - Three-frequency band branch line coupler based on short circuit parallel coupled lines - Google Patents
Three-frequency band branch line coupler based on short circuit parallel coupled lines Download PDFInfo
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- CN106602198A CN106602198A CN201611078013.6A CN201611078013A CN106602198A CN 106602198 A CN106602198 A CN 106602198A CN 201611078013 A CN201611078013 A CN 201611078013A CN 106602198 A CN106602198 A CN 106602198A
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- line
- microstrip line
- microstrip
- parallel coupled
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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
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
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Abstract
The invention discloses a novel three-frequency band branch line coupler based on short circuit parallel coupled lines. The three-frequency band branch line coupler comprises an upper layer microstrip structure, a middle layer dielectric plate, and lower layer grounding metal. The upper layer microstrip structure comprises four microstrip lines connected together to form a ring shape, four pairs of bent parallel coupled lines, four metalized through holes, and four input/output port microstrip feeder lines. The middle four microstrip lines are connected together to form the ring shape, and a conventional single-frequency band branch line coupler is formed. Four feeder ports are respectively loaded with the four pairs of parallel coupled lines, and are connected with the lower layer grounding metal by the four metal through holes to form the short circuit coupled lines, and therefore the requirements on the three-frequency band working of the structure is satisfied. The parallel coupled lines are provided with transmission zero points, and therefore an isolation degree among various passbands is improved. The three-frequency band branch line coupler has advantages of high isolation degree, simple structural design, good electrical performance, and abilities of realizing three-frequency band power division and realizing circuit integration and system packaging easily.
Description
Technical field
The present invention relates to a kind of three frequency division branch-line couplers based on short-circuit parallel coupled line, and in particular to a kind of structure letter
Single, isolation is high, realize the branch line coupler of three frequency range work(point effects.
Background technology
Used as one of passive device most basic in microwave system, it can provide orthogonal, in the same direction or reverse bonder
Signal output, and each outfan is mutually isolated.Therefore bonder is widely used in balanced amplifier, frequency mixer and array
In the microwave circuits such as the feeding network of antenna.Most common of which, be also most study be exactly branch line coupler and annular
Bonder.Branch line coupler is that the output amplitude of a three-dB coupler, its straightthrough port and coupling aperture is equal, phase 90
Degree.
With developing rapidly for Modern wireless communication technology, various communication services are arisen at the historic moment in different frequency range, then many
Frequency technology becomes to become more and more important, such that it is able to the communication spectrum of multiple frequency ranges is supported using a kind of device.Many scholar's research set
Counted out can multiple-frequency operation branch line coupler.The most common method of design multifrequency bonder is exactly directly by single-frequency transmission line
Change multifrequency transmission wire module into.It is typically employed on conditional branch line coupler structure that separately to increase road/short branch double to realize
Frequency division branch-line coupler, Pi types network as has been proposed, T-shaped network, left-and-right-hand transmission line, the notch cuttype impedance of loading detail
Etc. specific implementation.And it is also less for the research design of three frequency division branch-line couplers at this stage, the mode for proposing at present has：
The short branch that is further added by opening a way on Pi type networks replaces single-frequency transmission line, separately adds impedance transformer network in each port, at each end
Mouth increases compensation technique of capacitor and inductor etc..Its shortcoming is：(1) loaded using multiple details mostly, and detail Length discrepancy, it is each logical
The frequency formula of band is difficult to derive and calculates；(2) three frequency bonders are typically difficult to the work(point effect at mid frequency；(3) it is each
Isolation between individual passband is not high.
The content of the invention
It is an object of the invention to provide a kind of three frequency division branch-line couplers based on short-circuit parallel coupled line.
Realize that technical solution of the invention is：A kind of three frequency division branch-line couplers based on short-circuit parallel coupled line,
Including upper-layer micro-strip structure, interlayer plate and lower floor's grounded metal；Upper-layer micro-strip structure is attached to interlayer substrate
Upper surface, grounded metal are attached to the lower surface of interlayer substrate, the first port of the three frequencies bonder, second port,
3rd port and the 4th port are located at the upper strata of medium substrate, the first port, the 3rd port of second port and the 4th port
Respectively positioned at the left side of medium substrate, top, the right, following four sides；Four 50 ohm of microstrip line respectively with it is corresponding
Four ports are connected, and the microstrip line that four articles 50 ohm of port is respectively the first microstrip line, the second microstrip line, the 3rd microstrip line and the
Four microstrip lines, two adjacent microstrip lines are mutually perpendicular to；
5th microstrip line, the 7th microstrip line, the 6th microstrip line and the 8th microstrip line are sequentially connected with the direction of the clock, are formed
The structure of square ring, wherein the 5th microstrip line, the 6th microstrip line are disposed vertically, both at 50 ohm of microstrip line, the 7th
Microstrip line, the 8th microstrip line are placed in parallel, both at 35.36 ohm of microstrip line；Four microstrip lines of the square structure point
It is not connected with 50 ohm microstrips of four ports, wherein the 5th microstrip line is connected with the first microstrip line of port, the 7th micro-strip
Line is connected with the second microstrip line of port, and the 6th microstrip line is connected with the 3rd microstrip line of port, and the 8th microstrip line is micro- with port the 4th
Band wire is connected；
Between 50 ohm microstrip of microstrip line and port of the square structure that the four pairs of parallel coupled lines are connected between, this four
First parallel coupled line, the second parallel coupled line, the 3rd parallel coupled line and the 4th parallel coupling are respectively to parallel coupled line
Line, and four pairs of described parallel coupled lines are bent；Four pairs of parallel coupling devices of upper-layer micro-strip structure pass through first
During metallization via, the second metallization via, four metallization vias of the 3rd metallization via and the 4th metallization via are passed through
Interbed medium substrate is connected with lower floor grounded metal.
Compared with prior art, the invention has the advantages that：1) present invention is based on quarter-wave parallel coupling
Line, without the need for the open circuit short branch line of additional Length discrepancy so that structure is simpler, derives and calculates also easier；2) this
The bright 3dB power distributions for realizing three frequency ranges, and the work(point effect at usual three frequencies bonder mid frequency is difficult to；3)
Due to the introducing of transmission zero, between three passbands, high isolation is respectively provided with.
Below in conjunction with the accompanying drawings the present invention is described in further detail.
Description of the drawings
Fig. 1 is schematic diagram of the present invention based on three frequency division branch-line couplers of short-circuit parallel coupled line.
Fig. 2 is the equivalent circuit diagram of three frequency divisions branch-line coupler even and odd mode analysis of the invention, and wherein Fig. 2 (a) is even-idol mould
Equivalent circuit diagram, Fig. 2 (b) are even-odd mould equivalent circuit diagram, and Fig. 2 (c) is even-odd mould equivalent circuit diagram, and Fig. 2 (d) is odd-odd
Mould equivalent circuit diagram.
Fig. 3 is the transfer curve of the return loss plot with straightthrough port of three frequency divisions branch-line coupler of the invention.
Fig. 4 is the characteristic curve of the transfer curve with isolated port of three frequency divisions branch-line coupler coupling aperture of the invention.
Specific embodiment
The invention discloses a kind of three frequency division branch-line couplers based on short-circuit parallel coupled line, including upper strata micro-strip knot
Structure, interlayer plate and lower floor's grounded metal；Upper-layer micro-strip structure is attached to interlayer upper surface of base plate, grounded metal
Be attached to the lower surface of interlayer substrate, first port P1 of the three frequencies bonder, second port P2, the 3rd port P3 and
4th port P4 is located at the upper strata of medium substrate, first port P1, second port P2 the 3rd port P3 and the 4th port P4
Respectively positioned at the left side of medium substrate, top, the right, following four sides；Four 50 ohm of microstrip line respectively with it is corresponding
Four ports are connected, and this four articles 50 ohm microstrip line is respectively the first microstrip line 1, the second microstrip line 2,3 and of the 3rd microstrip line
4th microstrip line 4, two adjacent microstrip lines are mutually perpendicular to；
5th microstrip line 5, the 7th microstrip line 7, the 6th microstrip line 6 and the 8th microstrip line 8 are sequentially connected with the direction of the clock,
The structure of square ring is formed, wherein the 5th microstrip line, the 6th microstrip line are disposed vertically, both at 50 ohm of microstrip line,
7th microstrip line, the 8th microstrip line are placed in parallel, both at 35.36 ohm of microstrip line；Four micro-strips of the square structure
Line is connected with 50 ohm microstrips of four ports respectively, wherein the 5th microstrip line 5 is connected with 50 ohm microstrips 1, the 7th
Microstrip line 7 is connected with 50 ohm microstrips 2, and the 6th microstrip line 6 is connected with 50 ohm microstrips 3, the 8th microstrip line 8 and 50 ohm
Microstrip line 4 is connected；
Between 50 ohm microstrip of microstrip line and port of the square structure that the four pairs of parallel coupled lines are connected between, this four
First parallel coupled line 9, the second parallel coupled line 10, the 3rd parallel coupled line 11 are respectively to parallel coupled line parallel with the 4th
Coupling line 12, and four pairs of described parallel coupled lines are bent；Four pairs of parallel coupling devices of upper-layer micro-strip structure lead to
Cross the first metallization via 13, the second metallization metallization of via the 14, the 3rd via 15 and the 4th metallization via 16 4 is golden
Categoryization via is connected through interlayer substrate with lower floor grounded metal.
First microstrip line 1 of the port and the 3rd microstrip line 3 have identical length, width, 2 He of the second microstrip line
There is 4th microstrip line 4 identical length, width, the 5th microstrip line 5 of 50 ohm microstrip and the 6th microstrip line 6 to have phase
Length together, width, a quarter of frequency wavelength centered on length；Described 35.36 ohm of 7 He of the 7th microstrip line of microstrip line
8th microstrip line 8 has identical length, width, a quarter of frequency wavelength centered on length.
First parallel coupled line 9, the second parallel coupled line 10, the 3rd parallel coupled line 11 and the 4th parallel coupled line
12 have identical length, width, and length is similarly a quarter of center frequency wavelength, and the coupling space between coupling line
It is identical to be 0.4mm～0.7mm.First metallization via 13, second metallization metallization 15 and of via of via the 14, the 3rd
4th metallization via 16 has identical diameter.
The dielectric constant of the medium substrate is 2～16, and the height of medium substrate is 0.1～4mm.
The present invention is based on quarter-wave parallel coupled line, without the need for the open circuit short branch line of additional Length discrepancy so that
Structure is simpler, derives and calculates also easier.
With reference to embodiment, the present invention is further detailed explanation.
Embodiment
Three frequency division branch-line couplers of the present invention based on short-circuit parallel coupled line, in traditional single-frequency branch line coupler structure
Comprising four microstrip lines on load quarter-wave parallel coupled line respectively, and by via ground connection of metallizing, realize
The branch line coupler of 3dB work(point effect under three frequency ranges.Also, the application of parallel coupled line introduces transmission zero, makes
Obtain higher isolation is obtained between each passband.The size of whole medium substrate, 100mm*100mm*1.0mm, medium substrate
Dielectric constant be 2.65.In Fig. 1, the length of microstrip line 1,3 is 24.72mm, and width is 2.68mm, and the length of microstrip line 2,4 is
23.5mm, width are 2.68mm, and the length of microstrip line 5,6 is 53.0mm, and width is 2.68mm, and the length of microstrip line 7,8 is
45.2mm, width are 4.62mm.The length of parallel coupled line 9,10,11,12 is 51.6mm, and width is 1.11mm, between
Coupling space identical be 0.53mm.The diameter of four metallization vias is 0.8mm.
Fig. 2 (a)-(d) is the equivalent circuit diagram of the three frequency divisions branch-line coupler even and odd mode analysis, its equivalent inpnt admittance
Yee, Yeo, Yoe, Yoo are represented by：
Wherein, Z1It is the characteristic impedance (50 ohm) of bonder microstrip line 5,6, Z2It is the characteristic resistance of bonder microstrip line 7,8
Anti- (35.36 ohm), θ is the electrical length of bonder microstrip line, the parity mode impedance of Ze, Zo for parallel coupled line, YCFor short circuit
The input admittance of parallel coupled line.Parity mode admittance can be released according to the characteristic of bonder and meet YeeYeo=YoeYoo, will be above-mentioned
Five formulas are substituted into and can calculate the mid frequency of three passbands and the characteristic impedance and parallel coupling of square ring structure microstrip line
Relation between the parity mode impedance of zygonema.
Fig. 3 and Fig. 4 give the simulation result of the bonder using the parameter designing, and the three frequencies bonder is worked respectively
In 0.69/1.0/1.4GHz.It is the transmission characteristic song of the return loss plot with straightthrough port of three frequency division branch-line couplers shown in Fig. 3
Line, from the figure 3, it may be seen that in the working frequency points of three passbands, the insertion loss maximum of straightthrough port is respectively -3.08dB, -
3.34dB, -3.47dB.In 0.665～0.713GHz of frequency range, 0.984～1.018GHz, in 1.388～1.42GHz, return
Ripple loss is higher than 16dB.The transfer curve of three frequency division branch-line coupler coupling apertures shown in Fig. 4 is bent with the characteristic of isolated port
Line, as shown in Figure 4, in the working frequency points of three passbands, the insertion loss maximum of coupling aperture is respectively -3.32dB, -
3.54dB, -3.40dB.In 0.662～0.715GHz of frequency range, 0.982～1.02GHz, in 1.375～1.42GHz, port
Isolation is higher than 16dB.From Fig. 3 and Fig. 4, the amplitude difference between straightthrough port and coupling aperture insertion loss maintain ± 0.3dB it
Interior, phase contrast is maintained within 90 ° ± 1.5 °.
Therefore, three frequency divisions branch-line coupler proposed by the present invention, by the structure base in traditional single-frequency branch line coupler
Quarter-wave parallel coupled line is loaded on plinth, and is grounded to form short-circuit coupling line by the via that metallizes, realize three
The branch line coupler of 3dB work(point effect under frequency range.The Length discrepancy detail generally adopted using isometric coupling line rather than in the past
The loading of line so that analytical derivation becomes easier with the frequency for calculating each passband.Also, the application of parallel coupled line is introduced
Transmission zero so that obtain higher isolation between each passband.
Claims (4)
1. a kind of three frequency division branch-line couplers based on short-circuit parallel coupled line, it is characterised in that including upper-layer micro-strip structure, in
Interbed dielectric-slab and lower floor's grounded metal；Upper-layer micro-strip structure is attached to interlayer upper surface of base plate, grounded metal attachment
In the lower surface of interlayer substrate, the first port (P1) of the three frequencies bonder, second port (P2), the 3rd port (P3)
With the 4th port (P4) positioned at the upper strata of medium substrate, the first port (P1), the 3rd port (P3) of second port (P2) and
4th port (P4) is respectively positioned at the left side of medium substrate, top, the right, following four sides；Four 50 ohm of microstrip line
It is connected with corresponding four ports respectively, this four 50 ohm microstrip line is respectively the first microstrip line (1), the second microstrip line
(2), the 3rd microstrip line (3) and the 4th microstrip line (4), two adjacent microstrip lines are mutually perpendicular to；
5th microstrip line (5), the 7th microstrip line (7), the 6th microstrip line (6) and the 8th microstrip line (8) are in the direction of the clock sequentially
Connection, forms the structure of square ring, wherein the 5th microstrip line, the 6th microstrip line are disposed vertically, micro- both at 50 ohm
Band wire, the 7th microstrip line, the 8th microstrip line are placed in parallel, both at 35.36 ohm of microstrip line；Four of the square structure
Microstrip line is connected with 50 ohm microstrips of four ports respectively, wherein the 5th microstrip line (5) and 50 ohm microstrips (1) phase
Even, the 7th microstrip line (7) is connected with 50 ohm microstrips (2), and the 6th microstrip line (6) is connected with 50 ohm microstrips (3), and the 8th
Microstrip line (8) is connected with 50 ohm microstrips (4)；
Between 50 ohm microstrip of microstrip line and port of the square structure that the four pairs of parallel coupled lines are connected between, this four couple puts down
Row coupling line is respectively the first parallel coupled line (9), the second parallel coupled line (10), the 3rd parallel coupled line (11) and Siping City
Row coupling line (12), and four pairs of described parallel coupled lines are bent；Four pairs of parallel couplings of upper-layer micro-strip structure
Device was metallized by the first metallization via (13), the second metallization via (14), the 3rd metallization via (15) and the 4th
(16) four, hole metallization via is connected through interlayer substrate with lower floor grounded metal.
2. three frequency division branch-line couplers based on short-circuit parallel coupled line according to claim 1, it is characterised in that described
First microstrip line (1) and the 3rd microstrip line (3) of port with identical length, width, the second microstrip line (2) and the 4th micro-
With identical length, width, the 5th microstrip line (5) of 50 ohm microstrip and the 6th microstrip line (6) are with phase for band wire (4)
Length together, width, a quarter of frequency wavelength centered on length；Described 35.36 ohm of the 7th microstrip line (7) of microstrip line
With the 8th microstrip line (8) with identical length, width, a quarter of frequency wavelength centered on length.
3. three frequency division branch-line couplers based on short-circuit parallel coupled line according to claim 1, it is characterised in that described
First parallel coupled line (9), the second parallel coupled line (10), the 3rd parallel coupled line (11) and the 4th parallel coupled line (12) tool
There are identical length, width, a quarter of frequency wavelength centered on length, and the coupling space between coupling line is identical is
0.4mm～0.7mm；First metallization via (13), the second metallization via (14), the 3rd metallization via (15) and the
Four metallization via (16) are with identical diameter.
4. three frequency division branch-line couplers based on short-circuit parallel coupled line according to claim 1, it is characterised in that medium
The dielectric constant of substrate is 2～16, and the height of medium substrate is 0.1～4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611078013.6A CN106602198A (en) | 2016-11-29 | 2016-11-29 | Three-frequency band branch line coupler based on short circuit parallel coupled lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611078013.6A CN106602198A (en) | 2016-11-29 | 2016-11-29 | Three-frequency band branch line coupler based on short circuit parallel coupled lines |
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| CN106602198A true CN106602198A (en) | 2017-04-26 |
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| CN201611078013.6A Pending CN106602198A (en) | 2016-11-29 | 2016-11-29 | Three-frequency band branch line coupler based on short circuit parallel coupled lines |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111162360A (en) * | 2020-01-07 | 2020-05-15 | 上海科技大学 | Dual-frequency band-pass response lumped element power divider with-/+ 45 DEG phase shift |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204538169U (en) * | 2015-03-26 | 2015-08-05 | 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 reconfigurable hybrid coupler of phase place |
| CN105720345A (en) * | 2016-01-28 | 2016-06-29 | 南京理工大学 | High-selectivity cross-shaped wideband coupler |
-
2016
- 2016-11-29 CN CN201611078013.6A patent/CN106602198A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204538169U (en) * | 2015-03-26 | 2015-08-05 | 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 reconfigurable hybrid coupler of phase place |
| CN105720345A (en) * | 2016-01-28 | 2016-06-29 | 南京理工大学 | High-selectivity cross-shaped wideband coupler |
Non-Patent Citations (2)
| Title |
|---|
| HE ZHU等: ""Broadband microwave crossover using parallel-coupled microstrip lines and short-ended stubs"", 《IET MICROWAVES, ANTENNAS & PROPAGATION》 * |
| PEI-LING CHI等: ""Novel Dual-Band and Arbitrary Output-Phase Crossover Based on Two-Section Couplers"", 《2015 ASIA-PACIFIC MICROWAVE CONFERENCE (APMC)》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111162360A (en) * | 2020-01-07 | 2020-05-15 | 上海科技大学 | Dual-frequency band-pass response lumped element power divider with-/+ 45 DEG phase shift |
| CN111162360B (en) * | 2020-01-07 | 2021-10-26 | 上海科技大学 | Dual-frequency band-pass response lumped element power divider with-/+ 45 DEG phase shift |
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