CN203826522U - Broadband substrate integrated waveguide filter adopting U-shaped slot line - Google Patents
Broadband substrate integrated waveguide filter adopting U-shaped slot line Download PDFInfo
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- CN203826522U CN203826522U CN201420192958.0U CN201420192958U CN203826522U CN 203826522 U CN203826522 U CN 203826522U CN 201420192958 U CN201420192958 U CN 201420192958U CN 203826522 U CN203826522 U CN 203826522U
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- rabbet joint
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Abstract
The utility model discloses a broadband substrate integrated waveguide filter adopting a U-shaped slot line. The broadband substrate integrated waveguide filter comprises a substrate integrated waveguide; the substrate integrated waveguide comprises a medium substrate, two metal patches arranged on a front face and a reverse face of the medium substrate, an upper row of metal through holes, and a lower row of metal through holes; and the two metal patches form an upper wall and a lower wall of the substrate integrated waveguide, the upper row of the metal through holes and the lower row of the metal through holes form a left wall and a right wall of the substrate integrated waveguide, the U-shaped slot line is etched on the metal patch on the front face of the medium substrate, and the substrate integrated waveguide etched with the U-shaped slot line forms a multi-mode resonator. The broadband substrate integrated waveguide filter enables the substrate integrated waveguide to form the multi-mode resonator by utilizing the etched U-shaped slot line, complexity that a periodic EBG structure is etched on the substrate integrated waveguide is eliminated, requirements of a miniaturized broadband communication system can be satisfied, the defect of large loss of a traditional microstrip broadband filter is overcome, the problem of high cost by utilizing the metal waveguide is also solved, and the broadband substrate integrated waveguide filter has a good application prospect.
Description
Technical field
The utility model relates to a kind of broad-band chip integrated waveguide filter, and especially a kind of broad-band chip integrated waveguide filter that adopts the U-shaped line of rabbet joint, belongs to field of wireless communication.
Background technology
Wireless communication technique is being brought into play more and more important effect in society life, does not follow as the important composition of field of wireless communication, and the demand of band pass filter also increases day by day.Compared with microstrip bandpass filter early, because the convenience in plane drawing and making sheet is widely used, still the loss of this filter is large, can produce very large energy emission especially in high frequency.Along with the development of mechanics of communication, also more and more higher to the requirement of filter.Although adopt the millimeter wave filter of metal waveguide can reach good technical indicator, involve great expense, can not be widely used; The millimeter wave filter with EBG (Electromagnetic Band-Gap) structure, can be good at meeting present technical requirement, but this filter volume is larger.Recently, adopt the millimeter wave filter of substrate integration wave-guide (Substrate Integrated Waveguide is called for short SIW) to be subject to very high attention, it is little that it can realize volume, the high-performance band-pass filter device that cost is low.It is a kind of novel waveguide, has the advantages that traditional metal waveguide quality factor are high, be easy to design, also has the unexistent features of conventional waveguide such as volume is little, cost is low, easy processing simultaneously.Its these advantages, make the filter of this structure be widely used in wireless telecommunication system.
With understanding, disclosed prior art is as follows according to investigations:
1) 2005, the people such as Zhu Lei deliver in the article that is entitled as " Ultra-wideband (UWB) bandpaSS filters using multiple-mode resonator " on IEEE Microwave and Wireless Components Letters, author has proposed a kind of multimode resonator that adopts Stepped Impedance line, structure as shown in Figure 1a, several modes of resonance of this structure move in needed passband, have realized a ultra-wide band filter; Fig. 1 b is its simulation result.
2) taking multimode resonator technology as basis, in order to improve the Out-of-band rejection level of ultra broadband pass filter, researchers have proposed further improvement project.2009, the people such as Wong Sai Wai deliver in the article that is entitled as " Quadruple-mode UWB bandpass filter with improved out-of-band rejection " on IEEE Microwave and Wireless Components Letters, two short circuit minor matters lines are proposed to introduce in multimode resonator, the 4th mode of resonance moved to frequency low side, form four-mode UWB filter together with first three mode of resonance, and produce a transmission zero at lower and higher cut-off frequency place respectively, thereby outside passband, produce higher Out-of-band rejection, this four moulds ultra-wide band filter structure as shown in Figure 2 a, the frequency response results of its measurement and emulation as shown in Figure 2 b.
3) above-mentioned two kinds of broadband filters design on microstrip line, and relative bandwidth is very wide, but to have a common defect be that loss ratio is larger for they.2005, the people such as Hao Zhangcheng deliver and are entitled as " Compact Super-Wide Bandpass Substrate Integrated Waveguide (SIW) Filters " have proposed to etch electromagnetic bandgap (EBG) structure on substrate integration wave-guide on IEEE Transaction on Microwave Theory and Techniques, as shown in Figure 3 a and Figure 3 b shows.As shown in Figure 3 c, relative bandwidth approaches 65% to simulation result, and loss is less, but this complicated structure is not easy to design and processing.
Utility model content
The purpose of this utility model is the defect in order to solve above-mentioned prior art, provides one to have multimode resonator, and can meet the broad-band chip integrated waveguide filter of the U-shaped line of rabbet joint of employing of minimized wide-band communication system requirement.
The purpose of this utility model can be by taking following technical scheme to reach:
A kind of broad-band chip integrated waveguide filter that adopts the U-shaped line of rabbet joint, comprise substrate integration wave-guide, described substrate integration wave-guide comprises medium substrate, be arranged on double layer of metal paster and the two rows metal throuth hole of medium substrate obverse and reverse, described double layer of metal paster forms the upper lower wall of substrate integration wave-guide, described two rows metal throuth hole runs through the metal patch in medium substrate front successively, the metal patch of medium substrate and medium substrate reverse side, form the left and right wall of substrate integration wave-guide, it is characterized in that: on the metal patch in described medium substrate front, be etched with the U-shaped line of rabbet joint, the substrate integration wave-guide of the U-shaped line of rabbet joint of described etching forms multimode resonator.
As a kind of preferred version, the described U-shaped line of rabbet joint has one, and this U-shaped line of rabbet joint is arranged on the metal patch center in medium substrate front.
As a kind of preferred version, the described U-shaped line of rabbet joint has two, the upper and lower symmetrical line of rabbet joint unit that forms of described two U-shaped line of rabbet joint, and this line of rabbet joint unit is arranged on the metal patch center in medium substrate front, wherein be positioned at the U-shaped line of rabbet joint both sides of top down, be positioned at the U-shaped line of rabbet joint both sides of below upward.
As a kind of preferred version, between described line of rabbet joint unit and upper row's metal throuth hole, be also provided with the first metal throuth hole, between described line of rabbet joint unit and lower row's metal throuth hole, be also provided with the second metal throuth hole; Described the first metal throuth hole and the second metal throuth hole are symmetrical up and down, and run through successively the metal patch of metal patch, medium substrate and the medium substrate reverse side in medium substrate front.
As a kind of preferred version, the described U-shaped line of rabbet joint has four, and the upper and lower symmetrical line of rabbet joint unit that forms of every two U-shaped line of rabbet joint, is wherein positioned at the U-shaped line of rabbet joint both sides of top down, is positioned at the U-shaped line of rabbet joint both sides of below upward; Described two line of rabbet joint unit are respectively the first line of rabbet joint unit and the second line of rabbet joint unit, and described the first line of rabbet joint unit and the second line of rabbet joint unit are symmetrical set on the metal patch in medium substrate front.
As a kind of preferred version, between described the first line of rabbet joint unit and upper row's metal throuth hole, be also provided with the first metal throuth hole, between described the first line of rabbet joint unit and lower row's metal throuth hole, be also provided with the second metal throuth hole; Between described the second line of rabbet joint unit and upper row's metal throuth hole, be also provided with the 3rd metal throuth hole, between described the second line of rabbet joint unit and lower row's metal throuth hole, be also provided with the 4th metal throuth hole; Described the first metal throuth hole and the second metal throuth hole are symmetrical up and down, described the 3rd metal throuth hole and the 4th metal throuth hole are symmetrical up and down, described the first metal throuth hole and the 3rd metal throuth hole are symmetrical, described the second metal throuth hole and the 4th metal throuth hole are symmetrical, and described the first metal throuth hole, the second metal throuth hole, the 3rd metal throuth hole and the 4th metal throuth hole run through the metal patch of metal patch, medium substrate and the medium substrate reverse side in medium substrate front successively.
As a kind of preferred version, described upper row's metal throuth hole is arranged on the upper edge near double layer of metal paster, and described lower row's metal throuth hole is arranged on the lower edge near double layer of metal paster.
As a kind of preferred version, the two ends, metal patch left and right in described medium substrate front are respectively equipped with output port and input port.
The utility model has following beneficial effect with respect to prior art:
1, broad-band chip integrated waveguide filter of the present utility model utilizes the U-shaped line of rabbet joint of etching, make substrate integration wave-guide form multimode resonator, eliminate the periodically complexity of EBG structure of etching on substrate integration wave-guide, can be widely used in wide-band communication system.
2, the volume of broad-band chip integrated waveguide filter of the present utility model has very large advantage compared with traditional sucrose integrated waveguide volume, and such as the comparison of the filter on equal 5 rank, circuit volume of the present utility model is little 2.5 times.
3, broad-band chip integrated waveguide filter of the present utility model have volume little, make simple advantage, can meet the requirement of minimized wide-band communication system, both overcome the large defect of traditional microstrip broadband filter loss, solve again the problem of utilizing metal waveguide to involve great expense, had good application prospect.
Brief description of the drawings
Fig. 1 a is the structural representation of the first prior art.
Fig. 1 b is the simulation result figure of the first prior art.
Fig. 2 a is the structural representation of the second prior art.
Fig. 2 b is the frequency response results figure of measurement and the emulation of the second prior art.
Fig. 3 a is the Facad structure schematic diagram of the third prior art.
Fig. 3 b is the reverse side structural representation of the third prior art.
Fig. 3 c is the simulation result figure of the third prior art.
Fig. 4 is the Facad structure schematic diagram of the utility model embodiment 1 broad-band chip integrated waveguide filter.
Fig. 5 is the mode profile figure of the utility model embodiment 1 broad-band chip integrated waveguide filter.
Fig. 6 is the simulation result figure of the utility model embodiment 1 broad-band chip integrated waveguide filter in close coupling and weak coupling situation.
Fig. 7 is the Facad structure schematic diagram of the utility model embodiment 2 broad-band chip integrated waveguide filters.
Fig. 8 is the mode profile figure of the utility model embodiment 2 broad-band chip integrated waveguide filters.
Fig. 9 is the simulation result figures of the utility model embodiment 2 broad-band chip integrated waveguide filters in close coupling and weak coupling situation.
Figure 10 is the Facad structure schematic diagram of the utility model embodiment 3 broad-band chip integrated waveguide filters.
Figure 11 is the simulation result figure of the utility model embodiment 3 broad-band chip integrated waveguide filters.
Figure 12 is the Facad structure schematic diagram of the utility model embodiment 4 broad-band chip integrated waveguide filters.
Figure 13 is the mode profile figure of the utility model embodiment 4 broad-band chip integrated waveguide filters.
Figure 14 is the simulation result figures of the utility model embodiment 4 broad-band chip integrated waveguide filters in close coupling and weak coupling situation.
Figure 15 is emulation and the graph of measured results of the utility model embodiment 4 broad-band chip integrated waveguide filters.
Figure 16 is the group delay curve chart of the utility model embodiment 4 broad-band chip integrated waveguide filters.
Wherein, 1-medium substrate, the metal patch in 2-front, the upper row of 3-metal throuth hole, arranges metal throuth hole under 4-, 5-output port, 6-input port, the 7-U type line of rabbet joint, 8-the first metal throuth hole, 9-the second metal throuth hole, 10-the first line of rabbet joint unit, 11-the second line of rabbet joint unit, 12-the 3rd metal throuth hole, 13-the 4th metal throuth hole.
Embodiment
Embodiment 1:
As shown in Figure 4, the broad-band chip integrated waveguide filter of the present embodiment comprises substrate integration wave-guide, described substrate integration wave-guide comprises medium substrate 1, (positive metal patch indicates 2 to be arranged on the double layer of metal paster of medium substrate 1 obverse and reverse, the metal patch of reverse side is not shown in the figures, embodiment 2～4 is identical) and two rows metal throuth hole, described double layer of metal paster forms the upper lower wall of substrate integration wave-guide; Described two rows metal throuth hole runs through the metal patch of metal patch 2, medium substrate 1 and medium substrate 1 reverse side in medium substrate 1 front successively, two row's metal throuth holes are equivalent to electric wall, form the left and right wall of substrate integration wave-guide, wherein said upper row's metal throuth hole 3 is arranged on the upper edge near double layer of metal paster 2, and described lower row's metal throuth hole 4 is arranged on the lower edge near double layer of metal paster 2; Metal patch 2 two ends, left and right in described medium substrate 1 front are respectively equipped with output port 5 and input port 6, center is etched with a U-shaped line of rabbet joint 7, the substrate integration wave-guide (SIW waveguide) of this U-shaped line of rabbet joint 7 of etching forms multimode resonator, in figure, a is the cut-off frequency for determining SIW waveguide, h is the position for determining zero point, respectively as shown in the formula shown in (1) and (2):
Then analyze the mode of resonance distribution map of the filter of the present embodiment, as shown in Figure 5, wherein f
1～f
5be respectively the frequency of the first～five mode of resonance, f
zfor zero frequency.As seen from Figure 5, it is closer that the first～three mode of resonance leaned on, and this can form a passband, but along with the increase of h, move to the frequency lower than the 3rd mode of resonance zero point, causes bandwidth to narrow; And Fig. 6 is while being h=4.5mm, filter respectively the simulation result in the situation that of strong, weak coupling (| S
11| be the return loss of input port, | S
21| be the forward transmission coefficient of input port to output port), wherein solid line is the simulation result of close coupling, dotted line is the simulation result of weak coupling, emulation first～three mode of resonance forms passband, four, the 5th mode of resonance is spurious mode, cause being with outer variation, need to curb.
Embodiment 2:
As shown in Figure 7, the broad-band chip integrated waveguide filter main feature of the present embodiment is: on the filter construction basis of embodiment 1, improve, increase a U-shaped line of rabbet joint, be to be etched with two U-shaped line of rabbet joint 7 on the metal patch 2 in described medium substrate 1 front, described two U-shaped line of rabbet joint are a line of rabbet joint unit of symmetrical formation Shang Xia 7, this line of rabbet joint unit is arranged on metal patch 2 centers in medium substrate 1 front, the U-shaped line of rabbet joint 7 both sides that are wherein positioned at top (are inverted U) down, be positioned at the U-shaped line of rabbet joint 7 both sides of below upward, the substrate integration wave-guide of this line of rabbet joint unit of etching forms multimode resonator equally, its cut-off frequency is tried to achieve by formula (1), transmission zero is tried to achieve by following formula (3):
The mode of resonance distribution map of the filter of the present embodiment, as shown in Figure 8, wherein f
1～f
4be respectively the frequency of the first～four mode of resonance, f
zfor zero frequency.As can be seen from Figure 8, the first～three mode of resonance can form a passband, only having a spurious mode near passband, can more easily find method to go to improve Out-of-band rejection characteristic; And Fig. 9 is while being h=2.75mm, filter is the simulation result in the situation that of strong, weak coupling respectively, and solid line is the simulation result of close coupling, dotted line is the simulation result of weak coupling, still can form a passband, outside band, have a transmission zero, only have a spurious mode near passband.
Embodiment 3:
As shown in figure 10, the main feature of the present embodiment is: on the filter construction basis of embodiment 2, improve, increase by two metal throuth holes, be to be also provided with the first metal throuth hole 8 between described line of rabbet joint unit and upper row's metal throuth hole 3, between described line of rabbet joint unit and lower row's metal throuth hole 4, be also provided with the second metal throuth hole 9, described the first metal throuth hole 8 and the second metal throuth hole are symmetrical Shang Xia 9, and run through successively the metal patch of metal patch 2, medium substrate 1 and medium substrate 1 reverse side in medium substrate 1 front.Simulation result as shown in figure 11, in band, return loss and Out-of-band rejection have all obtained certain improvement.
Embodiment 4:
As shown in figure 12, the main feature of the present embodiment is: due to the filter of above-described embodiment 1～3 | S21| parameter is not fine (can find out from the ordinate of each simulation curve), therefore on the filter construction basis of embodiment 3, improve, increase by two U-shaped line of rabbet joint and two metal throuth holes, be that the described U-shaped line of rabbet joint 7 has four, every two U-shaped line of rabbet joint are a line of rabbet joint unit of symmetrical formation Shang Xia 7, wherein be positioned at the U-shaped line of rabbet joint 7 both sides of top down, be positioned at the U-shaped line of rabbet joint 7 both sides of below upward; Described two line of rabbet joint unit are respectively the first line of rabbet joint unit 10 and the second line of rabbet joint unit 11, and described the first line of rabbet joint unit 10 and the second line of rabbet joint unit 11 are symmetrical set on metal patch 2; Between described the first line of rabbet joint unit 10 and upper row's metal throuth hole 3, be also provided with the first metal throuth hole 8, between described the first line of rabbet joint unit 10 and lower row's metal throuth hole 4, be also provided with the second metal throuth hole 9; Between described the second line of rabbet joint unit 11 and upper row's metal throuth hole 3, be also provided with the 3rd metal throuth hole 12, between described the second line of rabbet joint unit 11 and lower row's metal throuth hole 4, be also provided with the 4th metal throuth hole 13; Described the first metal throuth hole 8 and the second metal throuth hole are symmetrical Shang Xia 9, the 3rd metal throuth hole 12 and the 4th metal throuth hole are symmetrical Shang Xia 13, described the first metal throuth hole 8 and the 3rd metal throuth hole 12 are symmetrical, and described the second metal throuth hole 9 and the 4th metal throuth hole 13 are symmetrical; Described the first metal throuth hole 8, the second metal throuth hole 9, the 3rd metal throuth hole 12 and the 4th metal throuth hole 13 run through the metal patch of metal patch 2, medium substrate 1 and medium substrate 1 reverse side in medium substrate 1 front successively; The substrate integration wave-guide of etching the first line of rabbet joint unit 10 and the second line of rabbet joint unit 11 forms multimode resonator equally.
Continue to analyze with mode of resonance distribution map, as shown in figure 13, wherein f
1～f
5be respectively the frequency of the first～six mode of resonance, f
zfor zero frequency.As can be seen from Figure 13 the first～five pattern can form a passband, is with the outer transmission zero that has, and curbs zero point and be transmitted near the spurious mode of passband, improves widely band external characteristic, whole filter of while | and S21| parameter has also improved; And simulation result is as shown in figure 14, solid line is the simulation result of close coupling, and dotted line is the simulation result of weak coupling, passband of the first～five pattern formation, and first spurious mode is suppressed to-below 30dB.
In order to verify the correctness of filter construction of embodiment 4, the size design of according to the form below 1 goes out this filter, its emulation and measurement result curve are as shown in figure 15, dotted line is simulation result, solid line is measurement result, can see that in band, the measurement result of return loss is slightly more weaker than simulation result, but all below 11dB, measurement result and simulation result has good anastomose property; As shown in figure 16, the group delay that is this filter (refers to the time delay of signal waveform envelope, what reflect is that a device is on the impact with interior each frequency signal phase), in free transmission range, the group delay of (namely 6.75GHz to 10.35GHz) has good flatness, and its relative bandwidth has 42% (centre frequency 8.5GHz).
Table 1 filter size
In sum, filter of the present utility model utilizes the U-shaped line of rabbet joint of etching, make substrate integration wave-guide form multimode resonator, eliminate the periodically complexity of EBG structure of etching on substrate integration wave-guide, have simultaneously volume little, make simple advantage, can meet the requirement of minimized wide-band communication system, both overcome the large defect of traditional microstrip broadband filter loss, solve again the problem of utilizing metal waveguide to involve great expense, had good application prospect.
The above; it is only the utility model patent preferred embodiment; but the protection range of the utility model patent is not limited to this; anyly be familiar with those skilled in the art in the disclosed scope of the utility model patent; be equal to replacement or changed according to the technical scheme of the utility model patent and utility model design thereof, all being belonged to the protection range of the utility model patent.
Claims (8)
1. one kind adopts the broad-band chip integrated waveguide filter of the U-shaped line of rabbet joint, comprise substrate integration wave-guide, described substrate integration wave-guide comprises medium substrate, be arranged on double layer of metal paster and the two rows metal throuth hole of medium substrate obverse and reverse, described double layer of metal paster forms the upper lower wall of substrate integration wave-guide, described two rows metal throuth hole runs through the metal patch in medium substrate front successively, the metal patch of medium substrate and medium substrate reverse side, form the left and right wall of substrate integration wave-guide, it is characterized in that: on the metal patch in described medium substrate front, be etched with the U-shaped line of rabbet joint, the substrate integration wave-guide of the U-shaped line of rabbet joint of described etching forms multimode resonator.
2. a kind of broad-band chip integrated waveguide filter that adopts the U-shaped line of rabbet joint according to claim 1, is characterized in that: the described U-shaped line of rabbet joint has one, and this U-shaped line of rabbet joint is arranged on the metal patch center in medium substrate front.
3. a kind of broad-band chip integrated waveguide filter that adopts the U-shaped line of rabbet joint according to claim 1, it is characterized in that: the described U-shaped line of rabbet joint has two, the upper and lower symmetrical line of rabbet joint unit that forms of described two U-shaped line of rabbet joint, this line of rabbet joint unit is arranged on the metal patch center in medium substrate front, wherein be positioned at the U-shaped line of rabbet joint both sides of top down, be positioned at the U-shaped line of rabbet joint both sides of below upward.
4. a kind of broad-band chip integrated waveguide filter that adopts the U-shaped line of rabbet joint according to claim 3, it is characterized in that: between described line of rabbet joint unit and upper row's metal throuth hole, be also provided with the first metal throuth hole, between described line of rabbet joint unit and lower row's metal throuth hole, be also provided with the second metal throuth hole; Described the first metal throuth hole and the second metal throuth hole are symmetrical up and down, and run through successively the metal patch of metal patch, medium substrate and the medium substrate reverse side in medium substrate front.
5. a kind of broad-band chip integrated waveguide filter that adopts the U-shaped line of rabbet joint according to claim 1, it is characterized in that: the described U-shaped line of rabbet joint has four, the upper and lower symmetrical line of rabbet joint unit that forms of every two U-shaped line of rabbet joint, wherein be positioned at the U-shaped line of rabbet joint both sides of top down, be positioned at the U-shaped line of rabbet joint both sides of below upward; Described two line of rabbet joint unit are respectively the first line of rabbet joint unit and the second line of rabbet joint unit, and described the first line of rabbet joint unit and the second line of rabbet joint unit are symmetrical set on the metal patch in medium substrate front.
6. a kind of broad-band chip integrated waveguide filter that adopts the U-shaped line of rabbet joint according to claim 5, it is characterized in that: between described the first line of rabbet joint unit and upper row's metal throuth hole, be also provided with the first metal throuth hole, between described the first line of rabbet joint unit and lower row's metal throuth hole, be also provided with the second metal throuth hole; Between described the second line of rabbet joint unit and upper row's metal throuth hole, be also provided with the 3rd metal throuth hole, between described the second line of rabbet joint unit and lower row's metal throuth hole, be also provided with the 4th metal throuth hole; Described the first metal throuth hole and the second metal throuth hole are symmetrical up and down, described the 3rd metal throuth hole and the 4th metal throuth hole are symmetrical up and down, described the first metal throuth hole and the 3rd metal throuth hole are symmetrical, described the second metal throuth hole and the 4th metal throuth hole are symmetrical, and described the first metal throuth hole, the second metal throuth hole, the 3rd metal throuth hole and the 4th metal throuth hole run through the metal patch of metal patch, medium substrate and the medium substrate reverse side in medium substrate front successively.
7. according to a kind of broad-band chip integrated waveguide filter that adopts the U-shaped line of rabbet joint described in claim 2-6 any one, it is characterized in that: described upper row's metal throuth hole is arranged on the upper edge near double layer of metal paster, described lower row's metal throuth hole is arranged on the lower edge near double layer of metal paster.
8. according to a kind of broad-band chip integrated waveguide filter that adopts the U-shaped line of rabbet joint described in claim 2-6 any one, it is characterized in that: the two ends, metal patch left and right in described medium substrate front are respectively equipped with output port and input port.
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| CN201420192958.0U CN203826522U (en) | 2014-04-18 | 2014-04-18 | Broadband substrate integrated waveguide filter adopting U-shaped slot line |
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| CN201420192958.0U CN203826522U (en) | 2014-04-18 | 2014-04-18 | Broadband substrate integrated waveguide filter adopting U-shaped slot line |
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| CN103956542A (en) * | 2014-04-18 | 2014-07-30 | 华南理工大学 | Broadband substrate integration waveguide filter adopting U-shaped groove line |
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| CN108461878A (en) * | 2018-03-15 | 2018-08-28 | 昆山鸿永微波科技有限公司 | The adjustable millimeter wave filter of selectivity outside a kind of band |
| CN108461878B (en) * | 2018-03-15 | 2019-09-13 | 昆山鸿永微波科技有限公司 | The adjustable millimeter wave filter of selectivity outside a kind of band |
| CN108923104A (en) * | 2018-06-21 | 2018-11-30 | 云南大学 | Highly selective substrate integrates gap waveguide bandpass filter |
| CN108923104B (en) * | 2018-06-21 | 2024-04-19 | 云南大学 | High-selectivity substrate integrated gap waveguide band-pass filter |
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