CN111769347A - Differential ultra-wideband band-pass filter based on multimode slot line resonator - Google Patents
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Abstract
The invention provides a differential ultra wide band-pass filter based on a multimode slot line resonator, aiming at improving the out-of-band rejection of the band-pass filter on the premise of ensuring a higher common mode rejection degree, and the differential ultra wide band-pass filter comprises a medium substrate, wherein the upper surface of the medium substrate is printed with two rectangular microstrip lines and two U-shaped microstrip lines, the lower surface of the medium substrate is printed with a metal floor, two first stepped impedance slot lines and two second stepped impedance slot lines are etched on the metal floor, the second stepped impedance slot lines are formed by splicing rectangular low impedance slot lines and two linear high impedance slot lines, and the open end of one linear high impedance slot line is connected with an L-shaped uniform impedance slot line; a multi-mode gap line resonator is etched at the position of the Y-axis projection on the metal floor and comprises a uniform impedance half-wavelength gap line and a longitudinal linear branch, and the longitudinal linear branch consists of a T-shaped stepped impedance branch and a linear uniform impedance branch spliced with a longitudinal arm of the T-shaped stepped impedance branch.
Description
Technical Field
The invention belongs to the technical field of microwave and radio frequency, relates to a differential ultra-wideband band-pass filter, in particular to a wide-stop-band differential ultra-wideband band-pass filter based on a multimode slot line resonator, and can be applied to a radio frequency microwave communication system.
Background
With the rapid development of wireless communication technology, a band-pass filter plays an increasingly important role as a key frequency selection device, and the performance of the band-pass filter directly affects the quality of the whole communication system. Among them, an Ultra-wideband (UWB) filter having advantages of a small size, a wide frequency band, stable performance, and the like is widely used. In recent years, a design method of an ultra wideband filter has been proposed, and a multimode resonator method has become the most widely used method. The multimode resonator utilizes the generated high-order resonance mode, and can realize the ultra-wideband characteristic by adjusting the frequency range of the resonance mode. The ultra-wideband multimode filter based on the traditional microstrip technology has the advantages of low insertion loss, high return loss and the like, but has the defects of narrow stop band, poor out-of-band selectivity and large size, and cannot meet the requirement of the ultra-wideband filter on high performance, so that the research on the ultra-wideband filter with good out-of-band rejection characteristic has great significance. On the other hand, modern wireless systems are facing increasingly complex electromagnetic environments, which makes higher demands on the interference rejection capability of the filter. Differential circuits are widely used because of their excellent Common Mode (CM) interference resistance, which improves the dynamic range of the system. The differential structure is introduced into the ultra-wideband filter, so that not only is the miniaturization of the system realized, but also the good anti-interference performance is realized. Microstrip-slot line (MS) transition structures are widely used in differential passive devices due to their inherent CM interference immunity and independent Differential Mode (DM) response. In order to improve the performance of the differential ultra-wideband band-pass filter, including in-band notch, out-of-band rejection, out-of-band selectivity, common mode rejection and the like, research on the differential ultra-wideband band-pass filter is receiving more and more attention from numerous scholars at home and abroad.
For example, in the 'Compact-side-band-based band-pass filter with high-selectivity and side-band CM suppression' paper published in the electronic devices LETTERS journal (vol.54, No.1, novelmer 2018) by Jin Shi et al in 2018, a differential ultra-wideband band-pass filter with a Compact structure is proposed, in which two half-wavelength microstrip transmission lines mirror-symmetrical with respect to a central longitudinal axis and two half-wavelength coupling lines mirror-symmetrical with respect to the central longitudinal axis are printed on an upper surface of a dielectric substrate, a half-wavelength microstrip resonator loaded with a stepped impedance stub is printed above the two half-wavelength coupling lines, and a symmetry axis of the half-wavelength microstrip resonator coincides with the central longitudinal axis of the upper surface of the dielectric substrate. According to the invention, through the two half-wavelength transmission lines, the inversion of the signal phase on the transmission lines is realized, so that differential mode signals are mutually superposed, and common mode signals are mutually offset, but the phase inversion of the half-wavelength transmission lines has a narrow-band characteristic, so that the realized common mode rejection performance is poor; the ultra-wideband filter performance is realized by the half-wavelength microstrip line resonator loaded with the stepped impedance stub, but the ultra-wideband filter performance is poorer because the microstrip line resonator is difficult to suppress higher harmonics and the passband is narrower.
Disclosure of Invention
The invention aims to provide a differential ultra-wideband band-pass filter based on a multimode slot line resonator aiming at improving the out-of-band rejection of the band-pass filter on the premise of ensuring higher common-mode rejection degree aiming at overcoming the defects of the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention comprises a dielectric substrate 1;
the upper surface of the dielectric substrate 1 is printed with two U-shaped microstrip lines 2 with opposite openings, the two U-shaped microstrip lines are in mirror symmetry about a Y axis of a planar rectangular coordinate system XOY distributed on the upper surface of the dielectric substrate 1, two rectangular microstrip lines 3 in mirror symmetry about the Y axis are printed between microstrip bottoms of the two U-shaped microstrip lines 2, and long sides of the rectangular microstrip lines 3 are parallel to an X axis;
the lower surface of the dielectric substrate 1 is printed with a metal floor 4, and two first stepped impedance gap lines 5 which are mirror-symmetrical about a Y-axis projection and two second stepped impedance gap lines 6 which are mirror-symmetrical about the Y-axis projection are etched on the metal floor 4; the first stepped impedance gap line 5 is formed by splicing a rectangular gap and a linear gap, the second stepped impedance gap line 6 is formed by splicing a rectangular low-impedance gap line and two parallel linear high-impedance gap lines, the linear gap is connected with the rectangular low-impedance gap line, the first stepped impedance gap line 5 is located at the projection position of the U-shaped microstrip line 2 and used for transmitting differential mode signals and achieving inherent common mode signal suppression, and the two parallel linear high-impedance gap lines are located at the projection position of the rectangular microstrip line 3 and used for increasing coupling strength; the open end of one linear high-impedance gap line in the second stepped impedance gap lines 6 is connected with an L-shaped uniform impedance gap line 7 for realizing the trap characteristic; the Y-axis projection position on the metal floor 4 is etched with a multimode gap line resonator 8, the multimode gap line resonator 8 comprises a uniform impedance half-wavelength gap line and a longitudinal linear branch, the longitudinal linear branch is composed of a T-shaped stepped impedance branch and a linear uniform impedance branch spliced with a longitudinal arm of the T-shaped stepped impedance branch, and the T-shaped stepped impedance branch and the L-shaped uniform impedance gap line 7 are located on the same side of the X-axis projection.
In the differential ultra-wideband band-pass filter based on the multimode slot line resonator, the plane rectangular coordinate system XOY has an origin located on the central normal of the dielectric substrate 1.
In the differential ultra-wideband band-pass filter based on the multimode slot line resonator, the two microstrip arms of the U-shaped microstrip line 2 are mirror-symmetric with respect to the X-axis of the plane rectangular coordinate system XOY, and the line width of the microstrip arms is 50 Ω impedance line width.
In the differential ultra-wideband band-pass filter based on the multimode slot line resonator, the connection line of the middle points of the short sides of the two rectangular microstrip lines 3 is overlapped with the X axis of the plane rectangular coordinate system XOY.
In the differential ultra-wideband band-pass filter based on the multimode slot line resonator, the symmetry axis of the first stepped impedance slot line 5 and the symmetry axis of the second stepped impedance slot line 6 coincide with the projection of the X axis of the rectangular plane coordinate system XOY; the connecting point of the linear gap in the first stepped impedance gap line 5 and the rectangular low-impedance gap line in the second stepped impedance gap line 6 is located at the projection position of the edge line of the microstrip bottom of the U-shaped microstrip line 2 close to the Y axis, and the length of the linear gap is equal to the width of the microstrip bottom of the U-shaped microstrip line 2.
In the differential ultra-wideband band-pass filter based on the multimode slot line resonator, the symmetric axis of the T-shaped stepped impedance minor matters coincides with the projection of the Y axis of the plane rectangular coordinate system XOY.
In the differential ultra-wideband band-pass filter based on the multimode slot line resonator, the long edge of the rectangular slot of the first stepped impedance slot line 5 is the edge perpendicular to the projection of the Y axis, and the long edge of the transverse arm of the T-shaped stepped impedance stub is the edge parallel to the projection of the X axis.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the multimode slot line resonator is etched at the Y-axis projection position on the metal floor, the multimode slot line resonator comprises the uniform impedance half-wavelength slot line and the longitudinal linear branch, the resonance center frequency can be directly controlled and higher harmonics can be effectively inhibited by changing the length and the width of the uniform impedance half-wavelength slot line and the longitudinal linear branch, the range of the passband is widened, the multimode slot line resonator has a more flexible and controllable resonance mode, and compared with the prior art, the out-of-band inhibition performance of the bandpass filter is effectively improved.
2. According to the invention, two second stepped impedance gap lines are etched on the metal floor on the lower surface of the dielectric substrate, and form a capacitive three-line interdigital coupling structure together with the rectangular microstrip line on the upper surface of the dielectric substrate, and energy is transmitted between the two second stepped impedance gap lines and the multimode gap line resonator through three-line interdigital coupling, so that the coupling between input and output is enhanced, and the insertion loss of the filter is reduced; by introducing a plurality of transmission paths, two transmission zeros can be generated on two sides of the differential mode passband by the coupling mode, the gap coupling between the second stepped impedance gap line and the multimode gap line resonator is adjusted, the positions of the transmission zeros can be changed, and the design flexibility and the out-of-band selectivity of the differential ultra-wideband band-pass filter are remarkably improved.
3. According to the invention, the L-shaped uniform impedance gap line is loaded at the open end of one linear high-impedance gap line in the second stepped impedance gap line, the in-band trap characteristic is realized by using an asymmetric coupling structure, the center frequency of the trap can be adjusted by changing the length of the L-shaped uniform impedance gap line, and the structure has the advantages of small size, simple structure and easiness in implementation.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a diagram showing the relationship between the structures on the upper and lower surfaces of a dielectric substrate according to the present invention;
FIG. 3 is a diagram showing dimensions of various structures on the upper surface of a dielectric substrate according to the present invention;
FIG. 4 is a diagram showing dimensions of various structures on the lower surface of a dielectric substrate according to the present invention;
FIG. 5 is an S parameter map of differential mode return loss and differential mode insertion loss of the present invention;
fig. 6 is an S-parameter real map of common mode return loss and common mode insertion loss of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
Referring to fig. 1, the invention comprises a dielectric substrate 1, wherein the dielectric substrate 1 adopts a rectangular F4BM-2 material with a relative dielectric constant of 2.2, a size of 46.2mm × 26.0mm and a thickness of 0.8 mm.
Referring to fig. 2, two U-shaped microstrip lines 2 with opposite openings are printed on the upper surface of the dielectric substrate 1, the two U-shaped microstrip lines are in mirror symmetry with respect to a Y axis of a planar rectangular coordinate system XOY distributed on the upper surface of the dielectric substrate 1, two rectangular microstrip lines 3 in mirror symmetry with respect to the Y axis are printed between microstrip bottoms of the two U-shaped microstrip lines 2, a long side of each rectangular microstrip line 3 is parallel to an X axis, and a connection line of midpoints of short sides of the two rectangular microstrip lines 3 coincides with an X axis of the planar rectangular coordinate system XOY; the plane rectangular coordinate system XOY has an origin on the center normal of the dielectric substrate 1.
Referring to fig. 2, a metal floor 4 is printed on the lower surface of the dielectric substrate 1, and two first stepped impedance gap lines 5 mirror-symmetrical with respect to the Y-axis projection and two second stepped impedance gap lines 6 mirror-symmetrical with respect to the Y-axis projection are etched on the metal floor 4; the first stepped impedance gap line 5 is formed by splicing a rectangular gap and a linear gap, the second stepped impedance gap line 6 is formed by splicing a rectangular low-impedance gap line and two parallel linear high-impedance gap lines, the linear gap is connected with the rectangular low-impedance gap line, the first stepped impedance gap line 5 is located at the projection position of the U-shaped microstrip line 2 and used for transmitting differential mode signals and achieving inherent common mode signal suppression, and the two parallel linear high-impedance gap lines are located at the projection position of the rectangular microstrip line 3 and used for increasing coupling strength; the open end of one linear high-impedance gap line in the second stepped impedance gap lines 6 is connected with an L-shaped uniform impedance gap line 7 for realizing the trap characteristic; the Y-axis projection position on the metal floor 4 is etched with a multimode gap line resonator 8, the multimode gap line resonator 8 comprises a uniform impedance half-wavelength gap line and a longitudinal linear branch, the longitudinal linear branch is composed of a T-shaped stepped impedance branch and a linear uniform impedance branch spliced with a longitudinal arm of the T-shaped stepped impedance branch, and the T-shaped stepped impedance branch and the L-shaped uniform impedance gap line 7 are located on the same side of the X-axis projection.
Referring to fig. 3, two U-shaped microstrip lines 2 with opposite openings are printed on the upper surface of the dielectric substrate 1 and used for inputting or outputting differential mode signals and common mode signals simultaneously, the U-shaped microstrip line 2 is composed of a microstrip bottom parallel to the Y axis and two microstrip arms parallel to the X axis, so that signal transmission along a straight line is ensured, and the widths of the microstrip bottom and the two microstrip arms are the same and are both 50 Ω impedance line widths, so as to ensure that the feed port is well matched. Length L of microstrip bottom of U-shaped microstrip line 2114.0mm, width W12.4mm, length L of two microstrip arms2Line width W of 10.0mm2The distance d between the two microstrip arms and the boundary of the medium plate on the side is 6.0mm which is 2.4 mm.
Referring to fig. 3, two rectangular microstrip lines 3 which are mirror-symmetric with respect to the Y-axis are printed between the microstrip bottoms of the two U-shaped microstrip lines 2, and form a capacitive interdigital coupling structure together with a second stepped impedance slot line 6 etched on the lower surface of the dielectric substrate 1, and transmit energy together with the multimode slot line resonator 8 through three-line interdigital coupling, and the projection of the rectangular microstrip line 3 on the metal floor 4 coincides with the middle position of the second stepped impedance slot line 6 to enhance the inputAnd the insertion loss of the filter is reduced due to the coupling between the output, the size of the two rectangular microstrip lines 3 is 6.5mm × 2.5.5 mm, and the distance g between the rectangular microstrip lines 3 and the U-shaped microstrip line 2 on the side where the rectangular microstrip lines 3 are arranged is12.7mm, the distance g between the two rectangular microstrip lines 32＝3.0mm。
Referring to fig. 4, the lower surface of the dielectric substrate 1 is printed with a metal floor 4, and two first stepped impedance slot lines 5 which are mirror-symmetrical with respect to the Y-axis projection are etched on the metal floor 4. The first stepped impedance gap line 5 is formed by splicing a rectangular gap and a linear gap, and forms a conversion structure from a microstrip line to a gap line together with the U-shaped microstrip line 2 printed on the upper surface of the dielectric substrate 1, so that differential mode signals are transmitted and inherent common mode signal suppression is realized. The length of the linear gap in the first stepped impedance gap line 5 is equal to the width of the microstrip bottom of the U-shaped microstrip line 2, so that good signal transition is ensured. Rectangular slot length L of first stepped impedance slot line 536.0mm, 5.0mm width, 2.4mm linear slot transverse length, 0.2mm line width.
Referring to fig. 4, two second stepped impedance slot lines 6 which are mirror-symmetrical with respect to the Y-axis projection are etched on the metal floor 4, and form a capacitive interdigital coupling structure with the two rectangular microstrip lines 3 printed on the upper surface of the dielectric substrate 1, and energy is transmitted between the two second stepped impedance slot lines and the multimode slot line resonator 8 through three-line interdigital coupling, so as to enhance the coupling between the input and the output. The second stepped impedance gap line 6 is formed by splicing a rectangular low-impedance gap line and two parallel linear high-impedance gap lines, wherein the open end of one linear high-impedance gap line is connected with an L-shaped uniform impedance gap line 7 for realizing the trap characteristic. The symmetry axis of the first stepped impedance gap line 5 and the symmetry axis of the second stepped impedance gap line 6 coincide with the projection of the X-axis of the rectangular planar coordinate system XOY. Rectangular low impedance gap line length L of the second stepped impedance gap line 641.0mm, 0.7mm width, and linear high-impedance gap length L59.0mm, 0.15mm wide. Total length L of L-shaped uniform impedance gap line 763.8mm, 0.2mm width, and a gap g between two L-shaped uniform impedance slot lines 74＝1.4mm。
Referring to fig. 4, a multimode slot line resonator 8 is etched at a Y-axis projection position on the metal floor 4, the multimode slot line resonator 8 includes a uniform impedance half-wavelength slot line and a longitudinal linear branch, the longitudinal linear branch is composed of a T-shaped stepped impedance branch and a linear uniform impedance branch spliced with a longitudinal arm of the T-shaped stepped impedance branch, and the T-shaped stepped impedance branch and an L-shaped uniform impedance slot line 7 are located at the same side of the X-axis projection, the T-shaped stepped impedance branch has a symmetry axis coincident with the projection of the Y-axis of a planar rectangular coordinate system XOY, and a long side of a transverse arm is a side parallel to the X-axis projection, the multimode slot line resonator 8 is used to form a passband differential mode of an ultra-wide band, by changing the lengths and widths of the uniform impedance half-wavelength slot line and the longitudinal linear branch, the resonance mode of the multimode slot line resonator 8 can be adjusted, and the size of the resonator 8 is reduced, a third-order differential mode slot line 6 is added outside the multimode slot line resonator 8, and the pass-band differential mode is a second-length of a uniform impedance cross-length of the multimode slot line resonator is equal to a third-order differential mode impedance cross-length of a uniform impedance cross-length of a transmission filter, the multimode slot line resonator 8, the multimode slot is added to form a second-order differential mode cross-type differential-impedance cross-type slot length of a transmission mode cross-type filter, the multimode slot length of a transmission mode cross-type linear filter, the multimode slot is equal to a transmission mode cross-type transmission mode, the transmission mode cross-type transmission mode, the multimode slot length of the multimode slot is equal to 0.5 mm, the transmission mode, the transmission50.13mm, the distance g between the uniform impedance half-wavelength gap line and the rectangular low impedance gap line in the second stepped impedance gap line 63The zero point position can be adjusted by changing the pitch of the three-wire interdigital coupling, which is 0.2 mm.
The working principle of the invention is as follows: when signals are input from two microstrip arms of the U-shaped microstrip line on one side, microstrip differential mode signals excite an electric field of a first stepped impedance slot line below the microstrip differential mode signals, and microstrip common mode signals cannot excite the electric field of the first stepped impedance slot line, so that only the differential mode signals can pass through the first stepped impedance slot line and are transmitted to a second stepped impedance slot line, the common mode signals are suppressed, the differential mode signals transmitted on the second stepped impedance slot line are transmitted to a multimode slot line resonator through three-line interdigital coupling, input and output coupling is enhanced, and two transmission zeros are formed near a pass band to improve the selectivity of the filter; the multimode characteristic of the multimode slot line resonator is used for forming a differential ultra-wideband passband under a tight coupling condition, wherein a differential mode signal with a specific frequency forms a trapped wave under the action of an L-shaped uniform impedance slot line; and finally, the signal is output by the two microstrip arms of the U-shaped microstrip line on the other side, so that the filter characteristic of the ultra wide band is realized.
The technical effects of the present invention will be further explained by combining the actual measurement results as follows:
the content of the measurement experiment is as follows:
the vector network analyzer N5230A is used for carrying out measurement experiments one and two on the differential ultra-wideband band-pass filter based on the multimode slot line resonator, and the experiment one tests the differential mode return loss of the differential ultra-wideband band-pass filter
Sum and difference mode insertion loss
The results are shown in FIG. 5; experiment two tests the common mode return loss of the differential ultra wide band-pass filter
And common mode insertion loss
The results of the experiment are shown in FIG. 6.
Measurement of experimental results and analysis:
FIG. 5 shows the differential mode return loss of the differential ultra-wideband band-pass filter based on the multimode slot line resonator according to the present invention
Sum and difference mode insertion loss
The S parameter actual measurement chart shows that the band range of the ultra-wideband filter passband in the embodiment is 3.54-7.96 dB, and the relative bandwidth is 76.9%; a notch is formed at the position of 5.63GHz of the center frequency in the passband, and the 3dB bandwidth is 5.49-5.77 GHz; maximum differential mode return loss in passband
30.7dB, and the minimum differential mode insertion loss is 1.68 dB; two transmission zeros exist at two sides of the passband and are respectively positioned at 2.96GHz and 9.71GHz, so that out-of-band selectivity is remarkably improved; as can be seen from FIG. 5, the filter in the present embodiment has excellent out-of-band rejection performance, and the out-of-band rejection is greater than 15dB in the range of 9.05-20 GHz.
FIG. 6 shows the common mode return loss of the differential ultra-wideband band-pass filter based on the multimode slot line resonator according to the present invention
And common mode insertion loss
S parameter of (1), common mode return loss in this embodiment
Less than or equal to 0.6dB in working frequency range and common mode insertion loss
Greater than or equal to 33.5dB, it can be seen from fig. 6 that the differential ultra-wideband band-pass filter achieves significant common-mode rejection.
Claims (7)
1. A differential ultra-wideband band-pass filter based on a multimode slot line resonator is characterized by comprising a dielectric substrate (1);
the upper surface of the dielectric substrate (1) is printed with two U-shaped microstrip lines (2) with opposite openings, the two U-shaped microstrip lines are in mirror symmetry with respect to a Y axis of a planar rectangular coordinate system XOY distributed on the upper surface of the dielectric substrate (1), two rectangular microstrip lines (3) with mirror symmetry with respect to the Y axis are printed between microstrip bottoms of the two U-shaped microstrip lines (2), and long sides of the rectangular microstrip lines (3) are parallel to an X axis;
the lower surface of the dielectric substrate (1) is printed with a metal floor (4), and two first stepped impedance gap lines (5) which are mirror-symmetrical about a Y-axis projection and two second stepped impedance gap lines (6) which are mirror-symmetrical about the Y-axis projection are etched on the metal floor (4); the first stepped impedance gap line (5) is formed by splicing a rectangular gap and a linear gap, the second stepped impedance gap line (6) is formed by splicing a rectangular low-impedance gap line and two parallel linear high-impedance gap lines, the linear gap is connected with the rectangular low-impedance gap line, the first stepped impedance gap line (5) is located at the projection position of the U-shaped microstrip line (2) and used for transmitting differential mode signals and achieving inherent common mode signal suppression, and the two parallel linear high-impedance gap lines are located at the projection position of the rectangular microstrip line (3) and used for increasing coupling strength; the open end of one linear high-impedance gap line in the second stepped impedance gap lines (6) is connected with an L-shaped uniform impedance gap line (7) for realizing the trap characteristic; the metal floor is characterized in that a multimode gap line resonator (8) is etched at the Y-axis projection position on the metal floor (4), the multimode gap line resonator (8) comprises a uniform impedance half-wavelength gap line and a longitudinal linear branch, the longitudinal linear branch is composed of a T-shaped stepped impedance branch and a linear uniform impedance branch spliced with a longitudinal arm of the T-shaped stepped impedance branch, and the T-shaped stepped impedance branch and an L-shaped uniform impedance gap line (7) are located on the same side of the X-axis projection.
2. The differential ultra-wideband band-pass filter based on multimode slot-line resonators as claimed in claim 1, characterized in that said planar orthogonal coordinate system XOY has its origin on the central normal of the dielectric substrate (1).
3. The differential ultra-wideband band-pass filter based on the multimode slot-line resonator according to claim 1, characterized in that the two microstrip arms of the U-shaped microstrip line (2) are mirror symmetric with respect to the X-axis of the planar rectangular coordinate system XOY, and the line width of the microstrip arm is 50 Ω impedance line width.
4. The differential ultra-wideband band-pass filter based on the multimode slot-line resonator as claimed in claim 1, characterized in that the connection line of the middle points of the short sides of the two rectangular microstrip lines (3) is coincident with the X-axis of the rectangular planar coordinate system XOY.
5. The multimode slot-line resonator based differential ultra-wideband bandpass filter according to claim 1, characterized in that the symmetry axis of the first stepped impedance slot-line (5) and the symmetry axis of the second stepped impedance slot-line (6) coincide with the projection of the X-axis of a planar rectangular coordinate system XOY; and the connection point of the linear gap in the first stepped impedance gap line (5) and the rectangular low-impedance gap line in the second stepped impedance gap line (6) is positioned at the projection position of the side line of the U-shaped microstrip line (2) at the bottom close to the Y axis, and the length of the linear gap is equal to the width of the U-shaped microstrip line (2) at the bottom.
6. The differential ultra-wideband band-pass filter based on multimode slot-line resonators as claimed in claim 1, characterized in that the symmetry axis of said T-shaped stepped impedance stub coincides with the projection of the Y-axis of the planar rectangular coordinate system XOY.
7. The differential ultra-wideband band-pass filter based on multimode slot-line resonator according to claim 1, characterized in that the first stepped impedance slot-line (5) has a rectangular slot with a long side perpendicular to the Y-axis projection and a T-shaped stepped impedance stub with a transverse arm with a long side parallel to the X-axis projection.
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| CN113708030A (en) * | 2021-08-19 | 2021-11-26 | 西安电子科技大学 | Balance ultra-wideband band-pass filter based on multimode slot line resonator |
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| CN112350042A (en) * | 2020-11-20 | 2021-02-09 | 西安电子科技大学 | Single-ended to differential magic T with filtering characteristics |
| CN112350042B (en) * | 2020-11-20 | 2021-08-20 | 西安电子科技大学 | Single-ended to differential magic T with filtering characteristics |
| CN113708030A (en) * | 2021-08-19 | 2021-11-26 | 西安电子科技大学 | Balance ultra-wideband band-pass filter based on multimode slot line resonator |
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