CN107482288A - A quarter structural substract integrated waveguide dual-passband electrically tunable filter - Google Patents
A quarter structural substract integrated waveguide dual-passband electrically tunable filter Download PDFInfo
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- CN107482288A CN107482288A CN201710741558.9A CN201710741558A CN107482288A CN 107482288 A CN107482288 A CN 107482288A CN 201710741558 A CN201710741558 A CN 201710741558A CN 107482288 A CN107482288 A CN 107482288A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/2002—Dielectric waveguide filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
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Abstract
The present invention provides a kind of a quarter structural substract integrated waveguide dual-passband electrically tunable filter, including medium substrate, a quarter of medium substrate upper surface cover steel structure, the lower metal copper of medium substrate lower surface；A quarter covers steel structure and is provided with the plated-through hole for forming substrate integration wave-guide, and it is 50 ohm of input microstrip lines that a quarter, which covers steel structure lower left side, and a quarter is covered inside steel structure has a complimentary square spiral resonant ring on the right side of L-type groove；It is a large square metal flat on the right side of 50 ohm of transition microstrip lines, there is a undercut type perforated metal piece at large square metal flat center, its center is provided with center via, a quarter is covered includes six square metal pads below steel structure and 50 ohm of input microstrip lines, the features such as wave filter has small volume, and insertion loss is low, centre frequency continuously adjustabe, Out-of-band rejection are high, loading DC feedback is convenient, tuned speed is fast, tuning facilitates.
Description
Technical field
The present invention relates to microwave and millimeter wave technical field is belonged to, specifically a kind of a quarter structural substract integrated waveguide is double
Passband electrically tunable filter.
Background technology
With the continuous development of Modern wireless communication, in different frequency range there is a large amount of radio communication services, especially with
The development of software and radio technique, there is an urgent need to develop with before multiband covering power and the tunable radio frequency of functional characteristic
End.Radio-frequency filter is the important component of wireless communication RF front end, is widely used in radiofrequency signal beyond frequency band
Suppress, reach frequency band selection, suppress Image interference, reduce the purpose of picking crosstalk, there is the tunable characteristic of frequency response
Tunable radio frequency filter by be future broadband wireless communication systems important support, according to multiple communication standards such as GSM, CDMA, LTE
Division, have different index requests to the wave filter being operated under different systems.Traditional solution is to use radio frequency
The wave filter of switch selection corresponding index, this volume and cost to communication system all form burden, and with needing to integrate
Communication standard it is more and more, the wave filter of suitching type seems more and more inadvisable.Relative to can not tunable filter and radio frequency open
The combination of pass, realize that communication standard is switching to the development trend in future using tunable filter.
Tunable radio frequency passive device such as tunable filter, wave beam adjustable antenna etc. are most early in the armies such as electronic countermeasure, radar electricity
Used in equipment.It is adjustable that conventional adjustable method is divided into resonator mechanical deformation, including mechanical structure is adjustable, piezoelectricity is adjustable
Deng；Resonator loads adjustable element, including semiconductor variable capacitance diode, MEMS (Micro Electrol Mechanical
Systems) tunable capacitor and inductance, ferro-electric tunable appearance, liquid crystal tunable electric capacity, controllable impedance etc.；Resonator loading is tunable
Switch element, such as MEMS RF switches, PIN switches, mechanical switch；And dielectric resonator material is adjustable, such as yttrium iron pomegranate
YIG (yttrium iron garnet), ferroelectricity is adjustable etc..Over time, tunable optic filter is towards small-sized
Change, planarization, lightweight, the direction of high integration are developed.Due to the introducing of tuned cell, the loss of tunable optic filter is usual
More than general filter, in order to improve the loss characteristic of tunable optic filter, substrate integrated waveguide technology is introduced, it is compared to gold
Belong to waveguide and planar microstrip structure, its Q values of substrate integration wave-guide are high, in light weight, and loss is small, and power capacity is big, and cost is low, easily
Integrated in other planar circuits.The substrate integrated wave guide structure of a quarter structure be substrate integrated wave guide structure four/
One, very there is miniaturization.
The content of the invention
In view of the above the shortcomings that prior art, it is an object of the invention to provide a kind of a quarter structural substract collection
Into waveguide dual-passband electrically tunable filter.
For achieving the above object, technical solution of the present invention is as follows：
A kind of a quarter structural substract integrated waveguide dual-passband electrically tunable filter, including medium substrate, medium substrate
The a quarter of upper surface covers steel structure, the lower metal copper of medium substrate lower surface；
The a quarter covers steel structure and is provided with the plated-through hole for forming substrate integration wave-guide, and a quarter covers copper knot
Structure lower left side is 50 ohm of input microstrip lines, and the metallization of the top, composition substrate integration wave-guide of 50 ohm of input microstrip lines is led to
A L-type groove is provided with as co-planar waveguide input on the right side of hole；A quarter is covered inside steel structure has one on the right side of L-type groove
Complimentary square spiral resonant ring；It is 50 ohm of transition microstrip lines to be covered in a quarter on the right side of steel structure；A quarter covers steel structure
The uniform plated-through hole of a row of edge side is through upper surface copper-clad, medium substrate, lower floor's copper-clad, so by upper strata
Copper-clad, medium substrate, lower floor's copper clad layers and the uniform plated-through hole of row of edge one together form a quarter and cover copper
Structural substract integrated waveguide.
It is a large square metal flat on the right side of 50 ohm of transition microstrip lines, large square metal flat top center connects
50 ohm of output microstrip lines are connect, both sides are provided with a pair of L-type grooves to 50 ohm of transition microstrip lines up and down, and 50 ohm export microstrip line or so
Both sides are provided with a pair of L-type grooves, and four right angles of large square metal flat are cut away by four small squares, leave four otch；Greatly
Square metal planar central has a undercut type perforated metal piece, and its center is provided with center via, in undercut type perforated metal piece
Lower section is provided with a square metal piece, and conventional capacitive is welded between undercut type perforated metal piece and square metal piece；
It is biasing circuit that a quarter, which is covered below steel structure and 50 ohm of input microstrip lines, including：Six square gold
Belong to pad, current-limiting resistance, the second square metal welding are welded between the first square metal pad and the second square metal pad
Be welded with choke induction between disk and third party's shape metal pad, the second square metal pad and square metal pad it
Between be welded with ground capacity, capacitance is welded between third party's shape metal pad and the 5th square metal pad,
Varactor is welded between three square metal pads and hexagon metal pad, in hexagon metal pad and first
Square metal pad bottom is respectively equipped with the first rectangle perforated metal piece, the second rectangle perforated metal piece, the first rectangle punching gold
Category piece, the second rectangle perforated metal piece are provided with ground metallization through hole, the first square metal pad and the second rectangle punching gold
It is dc source between category piece, dc source is biased by the first square metal pad to circuit to be beaten by the second rectangle
Mesoporous metal piece is grounded, and hexagon metal pad and the first rectangle perforated metal piece are connected for being grounded；
5th square metal pad connection a quarter covers the center of complimentary square spiral resonant ring in steel structure and general
It is powered and holds, third party's shape metal pad is connected by capacitance below, a quarter covers steel structure and large square metal is put down
Isolated below face between the biasing circuit by parallel isolation plated-through hole.
It is preferred that a quarter covers steel structure and the junction of 50 ohm of transition microstrip lines is straight provided with a metal
Angle triangle.
It is preferred that the first square metal pad, the second square metal pad, third party's shape metal pad, the 6th
Square metal pad is located in same horizontal line, and the 5th square metal pad is located above third party's shape metal pad, four directions
Shape metal pad is below the second square metal pad.
It is preferred that the complimentary square spiral resonant ring includes inner ring and outer rings, wherein inner ring connects with outer shroud,
The width and spacing of two resonant rings are equal.
Beneficial effects of the present invention are：1. the present invention uses substrate integrated waveguide technology, compared to microstrip line, its Q value is high,
In light weight, loss is small, and power capacity is big, and cost is low, is easy to integrate with other planar circuits.A quarter covers steel structure substrate collection
It is a quarter structure obtained from substrate integration wave-guide is cut away along central cross and longitudinal direction into waveguide, structure is greatly reduced, had
There is miniaturization.2. due to using substrate integrated waveguide technology, by the equivalent dimension and resonant frequency of substrate integration wave-guide
Relation understand, resonant frequency is smaller, and size is bigger, so being very unlikely to using the low-frequency filter of substrate integrated waveguide technology
Realize, one advantage of the present invention is to use complement helical resonant ring so that resonant frequency strongly reduces, therefore humorous by complement helical
The ring that shakes controls its resonant frequency so that the size of outside a quarter structural substract integrated waveguide greatly reduces.3. the present invention by
A quarter covers steel structure substrate integration wave-guide and complimentary square spiral resonant ring produces the first passband, and has a transmission zero
Point, and respectively have a pair of L-type grooves by 50 ohm of transition, output microstrip line both sides, the effect of this four L-type grooves is the electricity to wave filter
Flow distribution forms perturbation, has encouraged bimodulus, produces the second passband, and has good harmonics restraint to act on, large square metal flat
To be cut away by four small squares be to reduce impedance at four right angles so that resonant frequency reduces.4. the present invention is in large square
There are a undercut type perforated metal piece and center via in metal flat center, has a square gold in undercut type perforated metal piece bottom
Belong to piece, be an electric capacity will to be welded between undercut type perforated metal piece and square metal piece here, it is therefore an objective in applied bias electricity
Under pressure effect, suppress higher hamonic wave effect.5. the present invention is transitioned into humorous after 50 ohm microstrips using L-type coplanar waveguide form
Shake chamber, can be significantly reduced reflection；A quarter, which is covered on the downside of steel structure, metallization VIA of the row along parallelism structural, its mesh
Be to reduce pad and a quarter to cover the coupling between steel structure and large square metal flat and influence the performance of wave filter；
In order to prevent voltage from entering vector network analyzer by substrate integration wave-guide to cause damage, it is welded with also between pad
Choke induction, choke induction are in order to every the logical direct current of exchange.6. the present invention can improve complement helical resonant ring by requiring
Radius, the passband of the different frequency range of the length and width of four L-type grooves, control, have a wide range of applications market.The wave filter
With small volume, insertion loss is low, centre frequency continuously adjustabe, Out-of-band rejection are high, loading DC feedback is convenient, tuned speed
It hurry up, tune the features such as facilitating.
Brief description of the drawings
Fig. 1 is the top view of a quarter structural substract integrated waveguide dual-passband electrically tunable filter provided by the invention.
Fig. 2 is the side view of a quarter structural substract integrated waveguide dual-passband electrically tunable filter provided by the invention.
Fig. 3 is Fig. 1 polycrystalline substance schematic diagram.
Fig. 4 be Fig. 1 in varactor apply bias voltage when return loss S11, insertion loss S21 curves and
The partial enlarged drawing of curve.
Wherein, 1 is medium substrate, and 21 be that a quarter covers steel structure, and 22 be lower metal copper, and 23 be that large square metal is put down
Face, 31 is form the plated-through hole of substrate integration wave-guide, and 32 be isolation plated-through hole, and 33 be ground metallization through hole,
Via centered on 34,41 be 50 ohm of input microstrip lines, and 42 be 50 ohm of transition microstrip lines, and 43, which are 50 ohm, exports microstrip lines, 5
It is complimentary square spiral resonant ring for L-type groove, 6,7 be metal right angled triangle, and 81 be the first L-type groove, and 82 be the second L-type groove,
83 be the 3rd L-type groove, and 84 be the 4th L-type groove, and 91 be the first otch, and 92 be the second otch, and 93 be the 3rd otch, and 94 cut for the 4th
Mouthful, 10 be undercut type perforated metal piece, and 11 be square metal piece, and 121 be the first square metal pad, and 122 be the second square gold
Belong to pad, 123 be third party's shape metal pad, and 124 be square metal pad, and 125 be the 5th square metal pad, 126
It is the first rectangle perforated metal piece for hexagon metal pad, 131,132 be the first rectangle perforated metal piece, and 14 be current limliting electricity
Resistance, 15 be choke induction, and 16 be ground capacity, and 17 be capacitance, and 18 be varactor, and 19 be conventional capacitive, and 20 be straight
Flow power supply.
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through specific realities different in addition
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.
A kind of a quarter structural substract integrated waveguide dual-passband electrically tunable filter, including medium substrate 1, medium substrate
The a quarter of 1 upper surface covers steel structure 21, the lower metal copper 22 of the lower surface of medium substrate 1；
The a quarter covers steel structure 21 and is provided with the plated-through hole 31 for forming substrate integration wave-guide, and a quarter is covered
The lower left side of steel structure 21 is the top of 50 ohm of input microstrip lines, 41,50 ohm of input microstrip lines 41, forms substrate integration wave-guide
The right side of plated-through hole 31 be provided with a L-type groove 5 and be used as co-planar waveguide input；A quarter covers the inside L of steel structure 21
There is a complimentary square spiral resonant ring 6 on the right side of type groove 5；It is 50 ohm of transition micro-strips to cover the right side of steel structure 21 in a quarter
Line 42；A quarter covers the uniform plated-through hole 31 of a row of the edge side of steel structure 21 through upper surface copper-clad, medium
Substrate, lower floor's copper-clad, so uniformly metallized by upper strata copper-clad, medium substrate, lower floor's copper clad layers and the row of edge one
Through hole 31 together form a quarter and cover steel structure substrate integration wave-guide.
The right side of 50 ohm of transition microstrip lines 42 is a large square metal flat 23, the top of large square metal flat 23
Center connects 50 ohm of output 43,50 ohm of transition microstrip lines of microstrip line and is provided with a pair of L-type grooves 81,82,50 Europe in both sides about 42
The left and right sides of nurse output microstrip line 43 is provided with a pair of L-type grooves 83,84, and four right angles of large square metal flat 23 are small just by four
It is square to cut away, leave four otch 91,92,93,94；There is a undercut type perforated metal piece at the center of large square metal flat 23
10, its center is provided with center via 34, and a square metal piece 11, the punching of undercut type are provided with below undercut type perforated metal piece 10
Conventional capacitive 19 is welded between sheet metal 10 and square metal piece 11；
It is biasing circuit that a quarter, which covers steel structure 21 and 50 ohm of lower sections of input microstrip line 41, including：Six sides
Shape metal pad 121-126, current limiting electricity is welded between the first square 121 and second square metal pad 122 of metal pad
Resistance 14, choke induction 15 is welded between the second square metal pad 122 and third party's shape metal pad 123, square second
Ground capacity 16 is welded between metal pad 122 and square metal pad 124, in the He of third party's shape metal pad 123
Capacitance 17 is welded between 5th square metal pad 125, in third party's shape metal pad 123 and hexagon metal welding
Varactor 18 is welded between disk 126, in the square lower part of metal pad 121 of hexagon metal pad 126 and first
Not She You the first rectangle perforated metal piece 131, the second rectangle perforated metal piece 132, the first rectangle perforated metal piece 131, second
Rectangle perforated metal piece 132 is provided with ground metallization through hole 33, the first square rectangle perforated metal of metal pad 121 and second
It is dc source 20 between piece 132, dc source 20 is biased and by by the first square metal pad 121 to circuit
Two rectangle perforated metal pieces 132 are grounded, and hexagon metal pad 126 is connected with the first rectangle perforated metal piece 131
For being grounded；
5th square metal pad 125 connection a quarter is covered in the complimentary square spiral resonant ring 6 in steel structure 21
The heart and conventional capacitive 19, third party's shape metal pad 123 is connected by capacitance 17 below, a quarter covers steel structure 21
And below large square metal flat 23 between the biasing circuit by parallel isolation plated-through hole 32 carry out every
From.
A quarter covers steel structure 21 and the junction of 50 ohm of transition microstrip lines 42 is provided with a metal right angled triangle
7, in order to reduce reflection.
First square metal pad 121, the second square metal pad 122, third party's shape metal pad 123, hexagon
Metal pad 126 is located in same horizontal line, and the 5th square metal pad 125 is located at the top of third party's shape metal pad 123, the
Square metal pad 124 is positioned at the second square lower section of metal pad 122.
The complimentary square spiral resonant ring 6 includes inner ring and outer rings, and wherein inner ring connects with outer shroud, two resonant rings
Width and spacing are equal.
In the present embodiment, medium substrate uses Rogers 4350, and its dielectric constant is 3.66, and fissipation factor 0.004 is thick
Spend and sealed for 0.508mm, varactor using the SMV1405 series varactors of skyworks companies using SC-79
Dress, the PIN diode total length of this encapsulation is about 1.5mm to 1.7mm, and the length of pin is about 0.15mm, and choke induction is
8nH, capacitance 100pF, current-limiting resistance are 200 ohm, ground capacity 1000pF, conventional capacitive 0.4pF, chokes electricity
Sense, capacitance, current-limiting resistance, ground capacity, conventional capacitive using 0402 encapsulation, i.e., inductance and capacitance resistance equal length and
Width is 1mm and 0.5mm, and a quarter, which is covered on the downside of steel structure, six square metal pads, and length of bonding pad and width are all set to
1mm, except between third party's shape metal pad 123 and hexagon metal pad 126 at intervals of 1.3mm, remaining pad it
Between at intervals of 0.635mm.The external sub-miniature A connector of 50 ohm microstrips and being connected on vector network analyzer measures, and works as voltage
When changing between 3V to 30V, the first passband central frequency changes to 1.586GHz from 1.349GHz, and tuning range is
237MHz, insertion loss changes to 0.584dB by 1.422dB, and the second passband central frequency is 7.991GHz and protected all the time
Hold constant, whole circuit size is a width of 27mm of a length of 24mm.
The present invention uses substrate integrated waveguide technology, and compared to microstrip line, its Q value is high, in light weight, and loss is small, and power holds
Amount is big, and cost is low, is easy to integrate with other planar circuits.It is substrate integration wave-guide that a quarter, which covers steel structure substrate integration wave-guide,
A quarter structure obtained from being cut away along central cross and longitudinal direction, structure greatly reduce, and have the function that miniaturization.
Because the relation using substrate integrated waveguide technology, equivalent dimension and resonant frequency by substrate integration wave-guide can
To know, resonant frequency is smaller, and size is bigger, so be very unlikely to realize using the low-frequency filter of substrate integrated waveguide technology, this
It is to use complement helical resonant ring to invent an advantage so that resonant frequency strongly reduces, therefore by complement helical resonant ring control
Make its resonant frequency so that the size of outside a quarter structural substract integrated waveguide greatly reduces.
The present invention covers steel structure substrate integration wave-guide by a quarter and complimentary square spiral resonant ring produces the first passband,
And have a transmission zero, and respectively have a pair of L-type grooves by 50 ohm of transition, output microstrip line both sides, the effect of this four L-type grooves
It is that perturbation is formed to the CURRENT DISTRIBUTION of wave filter, has encouraged bimodulus, produced the second passband, and has good harmonics restraint to act on,
It is to reduce impedance that four right angles of large square metal flat are cut away by four small squares so that resonant frequency reduces.
The present invention has a undercut type perforated metal piece and center via at large square metal flat center, is beaten in undercut type
One square metal piece is arranged at mesoporous metal piece bottom, is an electricity will to be welded between undercut type perforated metal piece and square metal piece here
Hold, it is therefore an objective under applying bias voltage effect, suppress higher hamonic wave effect.
The present invention is transitioned into resonator after 50 ohm microstrips using L-type coplanar waveguide form, can be significantly reduced
Reflection；A quarter, which is covered on the downside of steel structure, metallization VIA of the row along parallelism structural, and the purpose is to reduce pad and four points
One of cover the coupling between steel structure and large square metal flat and influence the performance of wave filter；In order to prevent voltage from passing through base
Piece integrated waveguide enters vector network analyzer and caused damage, and also choke induction is welded between pad, choke induction
It is in order to every the logical direct current of exchange.
The present invention can improve the radius of complement helical resonant ring, the length and width of four L-type grooves, control by requiring
The passband of different frequency ranges is made, has a wide range of applications market.The wave filter has small volume, and insertion loss is low, centre frequency
The features such as continuously adjustabe, Out-of-band rejection are high, loading DC feedback is convenient, tuned speed is fast, tuning facilitates.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, all those of ordinary skill in the art without departing from disclosed spirit with being completed under technological thought
All equivalent modifications or change, should by the present invention claim be covered.
Claims (4)
- A kind of 1. a quarter structural substract integrated waveguide dual-passband electrically tunable filter, it is characterised in that：Including medium substrate (1), a quarter of medium substrate (1) upper surface covers steel structure (21), the lower metal copper of medium substrate (1) lower surface (22)；The a quarter covers steel structure (21) and is provided with the plated-through hole (31) for forming substrate integration wave-guide, and a quarter is covered Steel structure (21) lower left side is 50 ohm of input microstrip lines (41), the top of 50 ohm of input microstrip lines (41), forms substrate collection A L-type groove (5), which is provided with, on the right side of into the plated-through hole (31) of waveguide is used as co-planar waveguide input；A quarter covers copper knot There is a complimentary square spiral resonant ring (6) on the right side of the internal L-type groove (5) of structure (21)；Steel structure (21) right side is covered in a quarter Side is 50 ohm of transition microstrip lines (42)；It is a large square metal flat (23) on the right side of 50 ohm of transition microstrip lines (42), large square metal flat (23) pushes up Portion center connects 50 ohm of output microstrip lines (43), 50 ohm of transition microstrip lines (42) up and down both sides be provided with a pair of L-type grooves (81, 82), it is provided with a pair of L-type grooves (83,84) at left and right sides of 50 ohm of outputs microstrip lines (43), four of large square metal flat (23) Right angle is cut away by four small squares, leaves four otch (91,92,93,94)；Large square metal flat (23) center has one Undercut type perforated metal piece (10), its center are provided with center via (34), and one is provided with below undercut type perforated metal piece (10) Square metal piece (11), conventional capacitive (19) is welded between undercut type perforated metal piece (10) and square metal piece (11)；It is biasing circuit that a quarter, which is covered below steel structure (21) and 50 ohm of input microstrip lines (41), including：Six sides Shape metal pad (121-126), it is welded between the first square metal pad (121) and the second square metal pad (122) Current-limiting resistance (14), choke induction is welded between the second square metal pad (122) and third party's shape metal pad (123) (15) ground capacity (16), is welded between the second square metal pad (122) and square metal pad (124), Capacitance (17) is welded between third party's shape metal pad (123) and the 5th square metal pad (125), in third party's shape Varactor (18) is welded between metal pad (123) and hexagon metal pad (126), in hexagon metal welding Disk (126) and the first square metal pad (121) bottom is respectively equipped with the first rectangle perforated metal piece (131), the second rectangle is beaten Mesoporous metal piece (132), the first rectangle perforated metal piece (131), the second rectangle perforated metal piece (132) are provided with ground metallization Through hole (33), it is dc source (20) between the first square metal pad (121) and the second rectangle perforated metal piece (132), directly Stream power supply (20) is biased and by the second rectangle perforated metal piece by the first square metal pad (121) to circuit (132) it is grounded, hexagon metal pad (126) is connected with the first rectangle perforated metal piece (131) for being grounded；5th square metal pad (125) connection a quarter covers the complimentary square spiral resonant ring (6) in steel structure (21) Center and conventional capacitive (19), third party's shape metal pad (123) is connected by capacitance (17) below, a quarter is covered Metallized below steel structure (21) and large square metal flat (23) between the biasing circuit by parallel isolation Through hole (32) is isolated.
- 2. a quarter structural substract integrated waveguide dual-passband electrically tunable filter according to claim, its feature exist In：A quarter covers steel structure (21) and the junction of 50 ohm of transition microstrip lines (42) is provided with a metal right angled triangle (7)。
- 3. a quarter structural substract integrated waveguide dual-passband electrically tunable filter according to claim, its feature exist In：First square metal pad (121), the second square metal pad (122), third party's shape metal pad (123), hexagon Metal pad (126) is located in same horizontal line, and the 5th square metal pad (125) is located at third party's shape metal pad (123) Top, square metal pad (124) is below the second square metal pad (122).
- 4. a quarter structural substract integrated waveguide dual-passband electrically tunable filter according to claim 1, its feature exist In：The complimentary square spiral resonant ring (6) includes inner ring and outer rings, and wherein inner ring connects with outer shroud, the width of two resonant rings Degree is equal with spacing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111934073A (en) * | 2020-09-27 | 2020-11-13 | 成都频岢微电子有限公司 | Miniaturized wide stop band filter based on micro-strip and substrate integrated waveguide mixing |
| CN113764850A (en) * | 2021-09-10 | 2021-12-07 | 中国科学院空天信息创新研究院 | Grounded coplanar waveguide-rectangular waveguide filtering transition structure |
| CN116053734A (en) * | 2023-02-10 | 2023-05-02 | 中国矿业大学 | S-C band active adjustable band-pass filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111934073A (en) * | 2020-09-27 | 2020-11-13 | 成都频岢微电子有限公司 | Miniaturized wide stop band filter based on micro-strip and substrate integrated waveguide mixing |
| CN113764850A (en) * | 2021-09-10 | 2021-12-07 | 中国科学院空天信息创新研究院 | Grounded coplanar waveguide-rectangular waveguide filtering transition structure |
| CN113764850B (en) * | 2021-09-10 | 2022-06-03 | 中国科学院空天信息创新研究院 | Grounded coplanar waveguide-rectangular waveguide filtering transition structure |
| CN116053734A (en) * | 2023-02-10 | 2023-05-02 | 中国矿业大学 | S-C band active adjustable band-pass filter |
| CN116053734B (en) * | 2023-02-10 | 2024-05-17 | 中国矿业大学 | S-C band active adjustable band-pass filter |
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