CN115863946B - High-isolation adjustable band-pass filter - Google Patents
High-isolation adjustable band-pass filter Download PDFInfo
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- CN115863946B CN115863946B CN202310196469.6A CN202310196469A CN115863946B CN 115863946 B CN115863946 B CN 115863946B CN 202310196469 A CN202310196469 A CN 202310196469A CN 115863946 B CN115863946 B CN 115863946B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to the technical field of radio frequency microwaves, in particular to a high-isolation adjustable band-pass filter, which comprises a filter body, wherein a filter working part is arranged in the filter body, a plurality of resonant cavities are arranged in the filter working part, YIG film structures are arranged in each resonant cavity, the adjacent YIG film structures transmit signals through a strip line, the resonant cavities for receiving microwave signals and the resonant cavities for outputting the microwave signals are respectively positioned at two sides in the filter working part, the rest resonant cavities are positioned between the two resonant cavities, and the resonant cavities which are mutually isolated are arranged, meanwhile, the resonant cavities arranged in the whole filter working part are distributed like a snake, so that the isolation between input and output ends is improved, the out-of-band inhibition of the filter is further improved, the adjustable band-pass filter is formed in a mode of exciting the YIG film through the strip line, fine structures and small-size metal rings do not need to be processed and welded, and the efficiency of process personnel is higher in the assembly of the filter.
Description
Technical Field
The invention relates to the technical field of radio frequency microwaves, in particular to a high-isolation adjustable band-pass filter.
Background
The test and measurement instrument is an indispensable part of the electronic information industry, and the YIG filter is one of the most core devices in the test and measurement equipment. The combined requirements of ultra wideband, high selectivity, small volume, etc. in spectrometer design have limited the application of switch filter components, YIG (yttrium iron garnet) tuned filter components have found widespread use in such situations. The ultra-wideband frequency-adjustable electronic system can realize continuous adjustment of the working frequency in an ultra-wideband (for example, 2-18 GHz), has the advantages of high selectivity, small volume and the like, and is the first choice for realizing ultra-wideband, high selectivity and miniaturization of various electronic systems at present.
At present, most YIG broadband tuning frequency preselectors adopt YIG pellets as resonators, a coupling structure adopts a coupling ring structure, and the YIG pellets are manufactured through Yttrium Iron Garnet (YIG) single crystal growth, directional cutting and mechanochemical polishing processes. The YIG ball harmonic oscillator adopts a spherical physical shape, and the balls obtained through grinding and polishing cannot obtain the crystal orientation of single crystal growth, so that a high-performance YTF filter cannot be designed, and expensive instruments and equipment are required to repeatedly test to reacquire the crystal orientation, or the crystal orientation is indirectly obtained in an actual YTF product through continuous debugging and high-low temperature tests, so that the production efficiency and reliability of YTF are low.
The YIG film grown by adopting the liquid phase epitaxy technology has the advantages of unique crystal orientation, low ferromagnetic resonance line width, easiness in processing and the like, the crystal orientation does not need to be regulated, and the mass production is easier to realize by design and processing. Although there are researches on YIG thin film filters at present, how to realize broadband tuning, and meanwhile, there are few researches on realizing YIG thin film tuned filters with high selectivity and small volume, and it is of great significance that high performance YIG tuned filters in batches can be realized according to the requirements of current test instruments and meters.
Disclosure of Invention
The invention aims at the problems and provides a high-isolation adjustable band-pass filter.
The technical scheme who adopts is, a high isolation adjustable band-pass filter, including the filter body, be provided with the wave filter operating portion in the filter body, wherein be provided with a plurality of resonant cavities in the wave filter operating portion, be provided with YIG film structure in every resonant cavity, adjacent YIG film structure passes through the band wire transmission signal, and be used for receiving microwave signal's resonant cavity and be used for exporting microwave signal's resonant cavity and be located the both sides in the wave filter operating portion respectively, other resonant cavities are located between above two resonant cavities.
Further, the filter body is composed of a conductive metal or an insulating material coated with a conductive metal.
Further, four resonant cavities are arranged in the filter working part, namely a first resonant cavity, a second resonant cavity, a third resonant cavity and a fourth resonant cavity, the first resonant cavity, the second resonant cavity, the third resonant cavity and the fourth resonant cavity are mutually isolated, the first resonant cavity is used for receiving microwave signals, and the fourth resonant cavity is used for outputting the microwave signals.
Optionally, a first YIG film structure is disposed in the first resonant cavity, a second YIG film structure is disposed in the second resonant cavity, a third YIG film structure is disposed in the third resonant cavity, and a fourth YIG film structure is disposed in the fourth resonant cavity.
Further, the strip line includes an input strip line, an output strip line, a first coupling strip line, a second coupling strip line, and a third coupling strip line, the input strip line is located above the first YIG film structure, the output strip line is located above the fourth YIG film structure, the second coupling strip line is located above the third YIG film structure and the second YIG film structure, the first coupling strip line is located above the input strip line and the second coupling strip line, and is also located above the second YIG film structure and the first YIG film structure, and the third coupling strip line is located above the output strip line and the second coupling strip line, and is also located above the third YIG film structure and the fourth YIG film structure.
Further, one end of the input strip line is connected with an input coaxial line arranged in the filter body, and the other end of the input strip line is grounded.
Optionally, one end of the output strip line is connected with an output coaxial line arranged in the filter body, and the other end of the output strip line is grounded.
Further, a second square groove and a fifth square groove are arranged in the filter working part, the second square groove is close to the second resonant cavity, the fifth square groove is close to the third resonant cavity, the second square groove and the fifth square groove are both positioned on extension lines of the second resonant cavity and the third resonant cavity, two ends of the second coupling strip line are grounded and are respectively positioned in the second square groove and the fifth square groove, and the second coupling strip line sequentially penetrates through a third narrow groove between the second square groove and the second resonant cavity, a second groove between the second resonant cavity and the third resonant cavity and a seventh narrow groove between the third resonant cavity and the fifth square groove.
Optionally, a first square groove and a third square groove are disposed in the working portion of the filter, the first square groove is close to the first resonant cavity, the third square groove is close to the second resonant cavity, the first square groove and the third square groove are both located on extension lines of the second resonant cavity and the first resonant cavity, two ends of the first coupling strip line are grounded and are located in the first square groove and the third square groove respectively, and the first coupling strip line sequentially penetrates through the first narrow groove between the first square groove and the first resonant cavity, the first groove between the first resonant cavity and the second resonant cavity, and the fourth narrow groove between the second resonant cavity and the third square groove.
Further, a fourth square groove and a sixth square groove are arranged in the filter working part, the sixth square groove is close to the fourth resonant cavity, the fourth square groove is close to the third resonant cavity, the fourth square groove and the sixth square groove are both positioned on extension lines of the third resonant cavity and the fourth resonant cavity, two ends of a third coupling strip line are grounded and are respectively positioned in the fourth square groove and the sixth square groove, and the third coupling strip line sequentially penetrates through an eighth narrow groove between the fourth square groove and the third resonant cavity, a third groove between the third resonant cavity and the fourth resonant cavity and a sixth narrow groove between the fourth resonant cavity and the sixth square groove.
The beneficial effects of the invention at least comprise one of the following;
1. by using the YIG film as the resonator of the adjustable band-pass filter, the resonator does not need to be oriented, and meanwhile, the preparation of the YIG film is easier than the preparation of YIG pellets, so that the requirement on the process is reduced, and the debugging efficiency of the filter is improved.
2. The tunable band-pass filter is formed by exciting the YIG film through the band wire, the 5-50GHz tunable filter is realized, a fine structure and a small-size metal ring do not need to be processed and welded, the efficiency of assembly of the filter by process staff is higher, and the mass production of the filter is easier to realize.
3. Through setting up the resonant cavity of mutual isolation, the resonant cavity of setting up in the whole filter operating portion simultaneously, and be the snakelike arrangement, improved the isolation between the input and output, and then improved the out-of-band suppression of filter.
4. By means of the cross-coupling strip line structure, stray coupling caused by a radio frequency magnetic field between the coupling strip lines is reduced, and isolation performance of the filter is improved.
Drawings
FIG. 1 is a schematic diagram of a filter body structure;
FIG. 2 is a schematic diagram of a filter working portion structure;
FIG. 3 is a schematic diagram of a rear perspective structure of a filter body;
FIG. 4 is a schematic diagram of the structure of a substrate and YIG film;
fig. 5 is a schematic perspective view of a filter body;
FIG. 6 is a graph of the test of a high isolation tunable bandpass filter under different magnetic fields;
in the reference numerals 1 is a filter body, 2 is a filter working section, 3 is a first resonant cavity, 4 is a second resonant cavity, 5 is a third resonant cavity, 6 is a fourth resonant cavity, 7 is an input strip line, 8 is an output strip line, 9 is a first coupling strip line, 10 is a second coupling strip line, 11 is a third coupling strip line, 12 is an input coaxial line, 13 is an output coaxial line, 14 is a first YIG film structure, 15 is a second YIG film structure, 16 is a third YIG film structure, 17 is a fourth YIG film structure, 18 is a second square groove, 19 is a third square groove, 20 is a fourth square groove, 21 is a fifth square groove, 22 is a sixth square groove, 23 is a first narrow groove, 24 is a second narrow groove, 25 is a third narrow groove, 26 is a fourth narrow groove, 27 is a fifth narrow groove, 28 is a sixth narrow groove, 29 is a seventh narrow groove, 30 is a first groove, 31 is a second groove, 32 is a third groove, 34 is a substrate, 33 is a third square groove, 35 is a eighth square groove, and 36 is a thin film.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
As shown in fig. 1 to 5, a band-pass filter with adjustable high isolation comprises a filter body 1, wherein a filter working part 2 is arranged in the filter body 1, a plurality of resonant cavities are arranged in the filter working part 2, YIG film structures are arranged in each resonant cavity, adjacent YIG film structures transmit signals through a band wire, resonant cavities for receiving microwave signals and resonant cavities for outputting microwave signals are respectively arranged on two sides in the filter working part 2, the rest resonant cavities are arranged between the two resonant cavities, and the two resonant cavities are respectively a resonant cavity for receiving the microwave signals and a resonant cavity for outputting the microwave signals.
The purpose of this design is that through using YIG film as the resonator of adjustable band pass filter, does not need to carry out the orientation of resonator, and the preparation of YIG film is easier for the preparation of YIG pellet simultaneously, has reduced the requirement to the technology, has promoted the debugging efficiency of filter. The tunable band-pass filter is formed by exciting the YIG film with the band wire, the 5-50GHz ultra-wideband tunable filter is realized, a fine structure and a small-size metal ring do not need to be processed and welded, the efficiency of assembly of the filter by process staff is higher, and the mass production of the filter is easier to realize.
In a specific implementation, the high-isolation adjustable band-pass filter comprises a filter body 1, a filter working part 2 is arranged in the filter body 1, a plurality of resonant cavities are arranged in the filter working part 2, the resonant cavities transmit signals through a strip line, resonant cavities for receiving microwave signals and resonant cavities for outputting the microwave signals in the resonant cavities are respectively positioned at two sides in the filter working part 2, the rest resonant cavities are positioned between the two resonant cavities, YIG film structures are fixed in the resonant cavities, and the YIG film structures are grounded in the resonant cavities.
It should be noted that the filter body used in the present embodiment is made of a conductive metal or an insulating material coated with a conductive metal, and typically the YIG film structure includes a YIG film 33, where the YIG film 33 is formed by using a liquid phase epitaxy technique to form a YIG film structure on a substrate 34, and the substrate 34 is gadolinium gallium garnet Dan Jipian, which is generally referred to as "GGG" for short. However, a similar technique is disclosed in the chinese patent publication No. CN105887201a, so that in this embodiment, no description is given of how to manufacture the YIG film structure by the liquid phase epitaxy technique, and the thicknesses of the substrate and the YIG film in actual use are generally determined by simulation, and the surface of the substrate 34 is usually grounded, which may be implemented by other forms in implementation by those skilled in the art, so that the YIG film 33 is disposed in the resonant cavity.
It should also be noted that fig. 5 is merely for illustrating the connection relationship between the substrate 33 and YIG film 34, and is not intended to show the actual size ratio thereof.
Meanwhile, in the specific implementation, taking a structure of four resonant cavities as an example, four resonant cavities are arranged in the filter working part 2, namely a first resonant cavity 3, a second resonant cavity 4, a third resonant cavity 5 and a fourth resonant cavity 6, the first resonant cavity 3, the second resonant cavity 4, the third resonant cavity 5 and the fourth resonant cavity 6 are mutually isolated, the first resonant cavity 3 is used for receiving microwave signals, and the fourth resonant cavity 6 is used for outputting microwave signals.
The design aims at improving the isolation degree between the input end and the output end by arranging the resonant cavities which are isolated from each other, and further improving the out-of-band rejection of the filter. Meanwhile, the filter body is made of conductive metal or insulating material coated with the conductive metal, so that necessary isolation performance is provided.
And adopt figure 1, figure 2 and figure 5 this kind to arrange four resonant cavities according to being the type serpentine, improved the isolation between the input and output end, and then improved the out-of-band rejection of wave filter.
It should be noted that in most use scenarios, the interior of the resonator is chamfered in order to reduce the machining difficulty, while the internal chamfer size of the resonator is determined based on simulation.
As shown in fig. 1 and 2, in the present embodiment, a first YIG film structure 14 is disposed in the first resonant cavity 3, a second YIG film structure 15 is disposed in the second resonant cavity 4, a third YIG film structure 16 is disposed in the third resonant cavity 5, and a fourth YIG film structure 17 is disposed in the fourth resonant cavity 6.
Meanwhile, the strip lines include an input strip line 7, an output strip line 8, a first coupling strip line 9, a second coupling strip line 10 and a third coupling strip line 11, the input strip line 7 is located above the first YIG film structure 14, the output strip line 8 is located above the fourth YIG film structure 17, the second coupling strip line 10 is located above the third YIG film structure 16 and the second YIG film structure 15, the first coupling strip line 9 is located above the input strip line 7 and the second coupling strip line 10 and is also located above the second YIG film structure 15 and the first YIG film structure 14, and the third coupling strip line 11 is located above the output strip line 8 and the second coupling strip line 10 and is also located above the third YIG film structure 16 and the fourth YIG film structure 17.
And input strip 7, output strip 8, first coupling strip 9, second coupling strip 10 and third coupling strip 11 are specifically connected and arranged as follows:
one end of the input strip line 7 is connected with an input coaxial line 12 arranged in the filter body 1, and the other end of the input strip line 7 is grounded.
One end of the output strip line 8 is connected with an output coaxial line 13 arranged in the filter body 1, and the other end of the output strip line 8 is grounded.
The filter working part 2 is internally provided with a second square groove 18 and a fifth square groove 21, the second square groove 18 is close to the second resonant cavity 4, the fifth square groove 21 is close to the third resonant cavity 5, the second square groove 18 and the fifth square groove 21 are both positioned on extension lines of the second resonant cavity 4 and the third resonant cavity 5, two ends of the second coupling strip line 10 are grounded and are respectively positioned in the second square groove 18 and the fifth square groove 21, and the second coupling strip line 10 sequentially passes through a third narrow groove 25 between the second square groove 18 and the second resonant cavity 4, a second groove 31 between the second resonant cavity 4 and the third resonant cavity 5 and a seventh narrow groove 29 between the third resonant cavity 5 and the fifth square groove 21.
The filter working part 2 is internally provided with a first square groove 36 and a third square groove 19, the first square groove 36 is close to the first resonant cavity 3, the third square groove 19 is close to the second resonant cavity 4, the first square groove 36 and the third square groove 19 are both positioned on extension lines of the second resonant cavity 4 and the first resonant cavity 3, the two ends of the first coupling strip line 9 are grounded and are respectively positioned in the first square groove 36 and the third square groove 19, and the first coupling strip line 9 sequentially passes through a first narrow groove 23 between the first square groove 36 and the first resonant cavity 3, a first groove 30 between the first resonant cavity 3 and the second resonant cavity 4 and a fourth narrow groove 26 between the second resonant cavity 4 and the third square groove 19.
The filter working portion 2 is internally provided with a fourth square groove 20 and a sixth square groove 22, the sixth square groove 22 is close to the fourth resonant cavity 6, the fourth square groove 20 is close to the third resonant cavity 5, the fourth square groove 20 and the sixth square groove 22 are both positioned on extension lines of the third resonant cavity 5 and the fourth resonant cavity 6, two ends of the third coupling strip line 11 are grounded and are respectively positioned in the fourth square groove 20 and the sixth square groove 22, and the third coupling strip line 11 sequentially passes through an eighth narrow groove 35 between the fourth square groove 20 and the third resonant cavity 5, a third groove 32 between the third resonant cavity 5 and the fourth resonant cavity 6 and a sixth narrow groove 28 between the fourth resonant cavity 6 and the sixth square groove 22.
And the end grounded to the input strip line 7 is typically inserted into the fourth slot 20 via a second narrow slot 24 provided between the first resonant cavity 3 and the fourth slot 20.
The end of the output strip line 8 that is grounded is typically inserted into the third party slot 19 via a fifth narrow slot 27 provided between the fourth resonant cavity 6 and the third party slot 19.
The design aims at reducing stray coupling generated by a radio frequency magnetic field between coupling strip lines and improving isolation performance of the filter by the cross coupling strip line structure. Typically the output strip, the input strip and the first coupling strip are arranged in parallel, the second coupling strip and the third coupling strip are arranged in parallel, but the angle adjustment may be made in a specific use scenario.
The vertical projections of the input strip line, the output strip line, the first coupling strip line, the second coupling strip line and the third coupling strip line are crossed, the crossing angle is 45-90 degrees, generally 90 degrees, and only the projection of the crossing point of the strip line is required to be ensured to be positioned on the YIG film structure.
Meanwhile, the input strip line, the output strip line, the first coupling strip line, the second coupling strip line and the third coupling strip line are made of conductive metal materials.
The design aims at that the two crossed coupling strip lines are mutually perpendicular, the microwave energy coupling between the strip lines is minimum, the input microwave energy is prevented from being transmitted to the output end through the coupling between the strip lines, and the isolation degree of the whole filter is improved.
It should be noted that the input strip line and the input coaxial line, and the output strip line and the output coaxial line are all connected by solder.
Meanwhile, the input coaxial line and the output coaxial line are both 50Ω coaxial lines.
The input strip line 13, the output strip line 14, the first coupling strip line 15, the second coupling strip line 16 and the third coupling strip line 17 have a certain gap in the vertical direction, and the specific gap size and the strip line width are obtained according to the bandwidth design requirement of the filter and simulation.
Meanwhile, the widths and depths of the square groove, the groove and the narrow groove for the coupling strip to pass through or penetrate through can be determined according to the simulated response waveforms, meanwhile, the bottom of the groove cannot be contacted with the bottom of the coupling strip, and the bottoms of the square groove and the narrow groove can be coincident with the bottom of the coupling strip for grounding the coupling strip. The narrow groove is used for positioning and placing the coupling belt wire, and the square groove is used for placing the coupling belt wire, so that the operation is convenient.
The specific working principle of the whole ultra-wideband adjustable band-pass filter is as follows:
when an input signal is fed from the input coaxial line 12 to the input strip line 7, the frequency of the input signal is the same as the resonance frequency of the YIG film structure, then the first YIG film structure 14 is excited to generate a magnetic field and is coupled with the first coupling strip line 9, the first coupling strip line 9 couples microwave energy to the second YIG film structure 15, after the second YIG film structure 15 is excited, the microwave energy is coupled to the second coupling strip line 10, meanwhile, the second coupling strip line 10 couples microwave energy to the third YIG film structure 16, after the third YIG film structure 16 is excited, the microwave energy is coupled to the third coupling strip line 11, finally the third coupling strip line 11 couples microwave energy to the fourth YIG film structure 17, after the fourth YIG film structure 17 is excited, the microwave energy is coupled to the output strip line 13, and finally the microwave signal is transmitted through the output strip line and the output coaxial line based on the strip line-film excitation coupling mode.
It should be noted that when the input signal frequency is different from the YIG film structure resonant frequency, the YIG film structure is not excited and therefore no energy is transferred.
As shown in fig. 6, a band-pass filter with adjustable high isolation is placed at the middle position of two magnetic pole heads of the magnetic field of the electromagnet, the magnetic field size ranges from 3600 Oe to 20000 Oe, S11 is return loss, S21 is insertion loss, when the magnetic field size ranges from 3600 Oe to 20000 Oe, the center frequency of the corresponding filter ranges from 5GHz to 50GHz, the 3dB bandwidth is about 70MHz, the out-of-band rejection is greater than 110dBc, and typically, the curve of return loss and insertion loss of the filter tuning frequency is 15GHz when the magnetic field is 7100 Oe is shown in the figure. As the magnetic field increases gradually, the center frequency of the filter moves gradually toward higher frequencies, but the 3dB bandwidth and out-of-band rejection of the filter can be kept substantially unchanged.
The whole filter uses the YIG film as the resonator of the adjustable band-pass filter, the resonator does not need to be oriented, and meanwhile, the preparation of the YIG film is easier than the preparation of YIG pellets, the requirement on the process is reduced, and the debugging efficiency of the filter is improved. The tunable band-pass filter is formed by exciting the YIG film with the band wire, the 5-50GHz ultra-wideband tunable filter is realized, a fine structure and a small-size metal ring do not need to be processed and welded, the efficiency of assembly of the filter by process staff is higher, and the mass production of the filter is easier to realize. By the cross-coupling strip line structure, stray coupling between the coupling strip lines is reduced, and isolation performance of the filter is improved. By arranging the resonant cavities which are isolated from each other, the isolation between the input end and the output end is improved, the out-of-band rejection of the filter is further improved, and the microwave energy interference between the input end and the output end is isolated by utilizing the resonant cavity structure which is arranged in a snake shape, so that the filter has higher out-of-band rejection. The out-of-band rejection full band is greater than 110dBc. Unlike common filters, the filter has no parasitic passband outside the band, and the 3dB bandwidth in the tuning range can be basically kept unchanged, so that the insertion loss is smaller, and the in-band standing wave is better.
Finally, it should be noted that: the foregoing description of the preferred embodiments of the present invention is not intended to be limiting, but rather, it will be apparent to those skilled in the art that the foregoing description of the preferred embodiments of the present invention can be modified or equivalents can be substituted for some of the features thereof, and any modification, equivalent substitution, improvement or the like that is within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (8)
1. The band-pass filter with the adjustable high isolation comprises a filter body (1), wherein a filter working part (2) is arranged in the filter body (1), and is characterized in that a plurality of resonant cavities are arranged in the filter working part (2), YIG film structures are arranged in each resonant cavity, the adjacent YIG film structures transmit signals through a strip line, the resonant cavities for receiving microwave signals and the resonant cavities for outputting the microwave signals are respectively positioned at two sides in the filter working part (2), the rest resonant cavities are positioned between the two resonant cavities, four resonant cavities are arranged in the filter working part (2), the microwave oven comprises a first resonant cavity (3), a second resonant cavity (4), a third resonant cavity (5) and a fourth resonant cavity (6), wherein the first resonant cavity (3), the second resonant cavity (4), the third resonant cavity (5) and the fourth resonant cavity (6) are mutually isolated, the first resonant cavity (3) is used for receiving microwave signals, the fourth resonant cavity (6) is used for outputting the microwave signals, a first YIG film structure (14) is arranged in the first resonant cavity (3), a second YIG film structure (15) is arranged in the second resonant cavity (4), a third YIG film structure (16) is arranged in the third resonant cavity (5), a fourth YIG film structure (17) is arranged in the fourth resonant cavity (6), and the strip line comprises an input strip line (7), the output strip line (8), the first coupling strip line (9), the second coupling strip line (10) and the third coupling strip line (11), the input strip line (7), the output strip line (8), the first coupling strip line (9), the second coupling strip line (10) and the third coupling strip line (11) are located above the YIG film structure, the cross point projection of the input strip line (7) and the first coupling strip line (9) is located on the YIG film structure, the cross point projection of the output strip line (8) and the third coupling strip line (11) is located on the YIG film structure, and the cross point projection of the second coupling strip line (10) and the first coupling strip line (9) and the third coupling strip line (11) is located on the YIG film structure.
2. A high isolation tunable bandpass filter according to claim 1 wherein the input strip (7) is above the first YIG film structure (14), the output strip (8) is above the fourth YIG film structure (17), the second coupling strip (10) is above the third YIG film structure (16) and the second YIG film structure (15), the first coupling strip (9) is above the input strip (7) and the second coupling strip (10) and also above the second YIG film structure (15) and the first YIG film structure (14), the third coupling strip (11) is above the output strip (8) and the second coupling strip (10) and also above the third YIG film structure (16) and the fourth YIG film structure (17).
3. A band-pass filter with adjustable high isolation according to claim 2, characterized in that one end of the input strip line (7) is connected to an input coaxial line (12) arranged in the filter body (1), and the other end of the input strip line (7) is grounded.
4. A band-pass filter with adjustable high isolation according to claim 2, characterized in that one end of the output strip line (8) is connected to an output coaxial line (13) arranged in the filter body (1), and the other end of the output strip line (8) is grounded.
5. The band-pass filter with adjustable high isolation according to claim 2, wherein a second square groove (18) and a fifth square groove (21) are arranged in the filter working portion (2), the second square groove (18) is close to the second resonant cavity (4), the fifth square groove (21) is close to the third resonant cavity (5), the second square groove (18) and the fifth square groove (21) are both positioned on extension lines of the second resonant cavity (4) and the third resonant cavity (5), two ends of the second coupling band (10) are grounded and are respectively positioned in the second square groove (18) and the fifth square groove (21), and the second coupling band (10) sequentially penetrates through a third narrow groove (25) between the second square groove (18) and the second resonant cavity (4), a second narrow groove (31) between the second resonant cavity (4) and the third resonant cavity (5), and a seventh narrow groove (29) between the third resonant cavity (5) and the fifth square groove (21).
6. The band-pass filter with adjustable high isolation according to claim 2, wherein a first square groove (36) and a third square groove (19) are arranged in the filter working part (2), the first square groove (36) is close to the first resonant cavity (3), the third square groove (19) is close to the second resonant cavity (4), the first square groove (36) and the third square groove (19) are both positioned on extension lines of the second resonant cavity (4) and the first resonant cavity (3), two ends of the first coupling band (9) are grounded and are respectively positioned in the first square groove (36) and the third square groove (19), and the first coupling band (9) sequentially penetrates through the first narrow groove (23) between the first square groove (36) and the first resonant cavity (3), the first narrow groove (30) between the first resonant cavity (3) and the second resonant cavity (4), and the fourth narrow groove (26) between the second resonant cavity (4) and the third square groove (19).
7. The band-pass filter with adjustable high isolation according to claim 2, wherein a fourth square groove (20) and a sixth square groove (22) are arranged in the filter working portion (2), the sixth square groove (22) is close to the fourth resonant cavity (6), the fourth square groove (20) is close to the third resonant cavity (5), the fourth square groove (20) and the sixth square groove (22) are both positioned on extension lines of the third resonant cavity (5) and the fourth resonant cavity (6), two ends of the third coupling band (11) are grounded and are respectively positioned in the fourth square groove (20) and the sixth square groove (22), and the third coupling band (11) sequentially passes through an eighth narrow groove (35) between the fourth square groove (20) and the third resonant cavity (5), a third narrow groove (32) between the third resonant cavity (5) and the fourth resonant cavity (6), and a sixth narrow groove (28) between the fourth resonant cavity (6) and the sixth square groove (22).
8. A high isolation tunable bandpass filter according to any one of claims 1-7 wherein the filter body (1) is composed of a conductive metal or an insulating material coated with a conductive metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310196469.6A CN115863946B (en) | 2023-03-03 | 2023-03-03 | High-isolation adjustable band-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310196469.6A CN115863946B (en) | 2023-03-03 | 2023-03-03 | High-isolation adjustable band-pass filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115863946A CN115863946A (en) | 2023-03-28 |
| CN115863946B true CN115863946B (en) | 2023-07-18 |
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| US4554516A (en) * | 1982-04-23 | 1985-11-19 | Microsource, Inc. | Frequency source having YIG absorption/transmission filter |
| US4998080A (en) * | 1989-06-02 | 1991-03-05 | Polytechnic University | Microwave channelizer based on coupled YIG resonators |
| CN2598165Y (en) * | 2003-01-02 | 2004-01-07 | 李忻 | Cavity filtering device with quasi-elliptic response |
| CN105186090A (en) * | 2015-07-29 | 2015-12-23 | 中国电子科技集团公司第四十一研究所 | Resonance structure of YIG electrically tunable filter |
| CN108767412B (en) * | 2018-06-25 | 2021-03-16 | 中国电子科技集团公司第四十一研究所 | LTCC-based ultra-wideband YIG electrically tunable filter coupling resonance structure |
| CN113540717B (en) * | 2021-09-15 | 2021-12-03 | 成都威频科技有限公司 | Adjustable band-pass filter |
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