CN210379364U - High-temperature superconducting ultra-wideband band-pass filter based on dual-mode resonator - Google Patents
High-temperature superconducting ultra-wideband band-pass filter based on dual-mode resonator Download PDFInfo
- Publication number
- CN210379364U CN210379364U CN201921770842.XU CN201921770842U CN210379364U CN 210379364 U CN210379364 U CN 210379364U CN 201921770842 U CN201921770842 U CN 201921770842U CN 210379364 U CN210379364 U CN 210379364U
- Authority
- CN
- China
- Prior art keywords
- dual
- mode resonator
- mode
- resonator
- dual mode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses a high temperature superconductor ultra wide band pass filter based on dual mode resonator, including first dual mode resonator, second dual mode resonator, third dual mode resonator, fourth dual mode resonator and the fifth dual mode resonator that connects in parallel each other, the one end and the first interdigital of first dual mode resonator are taken a percentage and are connected, the other end of first dual mode resonator with second dual mode resonator coupling connection, third dual mode resonator respectively with second dual mode resonator, fourth dual mode resonator coupling connection, the one end of fifth dual mode resonator with fourth dual mode resonator coupling connection, the other end and the second of fifth dual mode resonator indicate to take a percentage and connect. The utility model discloses can satisfy the requirement of small-size, high selectivity and low insertion loss, have good performance, have fine filtering selectivity and high inhibitive ability on the passband is high-end.
Description
Technical Field
The utility model relates to a wave filter technical field, especially a high temperature superconductive ultra wide band pass filter based on bimodulus syntonizer.
Background
As the demand for spectrum resource utilization and microwave system integration in communication systems increases, the miniaturization and high out-of-band rejection of filters is facing new challenges. Generally, the out-of-band rejection of a filter can be improved by adding more order resonators or introducing transmission zeros, and a multi-mode filter can realize a plurality of transmission poles without increasing the order, thereby achieving the effect of increasing the order. However, the conventional multimode filter has low selectivity, large insertion loss and poor reflection effect, and cannot meet the requirements of a high-order high-selectivity and small-size high-temperature superconducting multimode multistage filter.
SUMMERY OF THE UTILITY MODEL
For solving the problem that exists among the prior art, the utility model provides a high temperature superconduction ultra wide band pass filter based on dual mode resonator, this filter can satisfy the requirement of small-size, high selectivity and low insertion loss, has good performance, has fine filtering selectivity and high inhibitive ability on the passband is high-end.
The utility model adopts the technical proposal that:
a high-temperature superconducting ultra-wideband band-pass filter based on dual-mode resonators comprises a first dual-mode resonator, a second dual-mode resonator, a third dual-mode resonator, a fourth dual-mode resonator and a fifth dual-mode resonator which are connected in parallel, wherein one end of the first dual-mode resonator is connected with a first interdigital tap, the other end of the first dual-mode resonator is connected with the second dual-mode resonator in a coupling mode, the third dual-mode resonator is respectively connected with the second dual-mode resonator and the fourth dual-mode resonator in a coupling mode, one end of the fifth dual-mode resonator is connected with the fourth dual-mode resonator in a coupling mode, and the other end of the fifth dual-mode resonator is connected with a second interdigital tap.
The dual-mode resonators are connected in a mode of combining an interdigital structure and a coupling structure so as to conveniently realize the required coupling degree, the circuit size is also miniaturized, and the multi-mode single-pass UWB filter in the same passband is realized by adopting the parallel multi-mode resonators. The ultra-wideband filter of the parallel multi-mode resonator has better out-of-band rejection performance than the filter of the multi-mode single resonator. In addition, because the high-temperature superconducting material has the characteristics of small surface resistance and high quality factor, the manufactured high-order filter has small loss, the filter has the passband insertion loss of 0.25dB, the relative bandwidth of 117 percent and steep roll-off of a sideband, and can meet the requirements of high-order high selectivity and small size.
Further, the resonant frequency of the first dual-mode resonator is 3.1GHz-10.6GHz, and the resonant frequencies of the first dual-mode resonator, the second dual-mode resonator, the third dual-mode resonator, the fourth dual-mode resonator and the fifth dual-mode resonator are the same.
The filtering requirement of the broadband can be met.
Furthermore, the first dual-mode resonator and the second dual-mode resonator are located on two symmetrical planes, the first dual-mode resonator, the third dual-mode resonator and the fifth dual-mode resonator are located on the same side face, and the second dual-mode resonator and the fourth dual-mode resonator are located on the same side face.
The channel interference is reduced, the size is reduced, and the requirement of miniaturization is met.
Furthermore, the filter also comprises an MgO substrate of a double-sided YBCO high-temperature superconducting thin film with the thickness of 0.5mm, and the first double-mode resonator, the second double-mode resonator, the third double-mode resonator, the fourth double-mode resonator, the fifth double-mode resonator, the first interdigital tap and the second interdigital tap are respectively imprinted on the substrate.
The first dual-mode resonator, the second dual-mode resonator, the third dual-mode resonator, the fourth dual-mode resonator, the fifth dual-mode resonator, the first interdigital tap and the second interdigital tap are respectively imprinted on the substrate, so that low insertion loss and wide upper stop band can be realized.
The utility model has the advantages that:
1. the filter can meet the requirements of small size, high selectivity and low insertion loss, has good performance, and has good filtering selectivity and high inhibition at the high end of a pass band;
2. the dual-mode SIR is combined with the interdigital structure and the coupling structure to conveniently realize the required coupling degree and further miniaturize the circuit size;
3. compared with the traditional multimode single resonator filter, the ultra-wideband filter adopting the parallel dual-mode resonator has better out-of-band rejection performance;
4. the filter has the advantages of compact structure, simple design and good application prospect in a communication system.
Drawings
Fig. 1 is a schematic structural diagram of a high-temperature superconducting ultra-wideband band-pass filter based on a dual-mode resonator according to an embodiment of the present invention;
fig. 2 is a circuit model diagram of an n-order dual-mode low-pass prototype according to an embodiment of the present invention;
fig. 3 is a frequency response of a dual-mode resonator and a group delay curve of the dual-mode resonator according to an embodiment of the present invention;
fig. 4 is a graph of external quality factor of a dual-mode resonator versus the length of an interdigital finger in an externally coupled interdigital structure in accordance with an embodiment of the present invention;
fig. 5 is a graph illustrating the variation of resonant frequency when two single/dual mode resonators are coupled together according to an embodiment of the present invention;
fig. 6 is a graph showing the variation relationship between the coupling coefficient and the horizontal distance and the vertical distance between two resonators according to the embodiment of the present invention;
fig. 7 is a graph of the measurement and simulation results of insertion/return loss according to an embodiment of the present invention;
fig. 8 is a graph of the measurement and simulation results of the group delay according to the embodiment of the present invention.
Description of reference numerals:
1. a first dual-mode resonator; 2. a second dual-mode resonator; 3. a third dual-mode resonator; 4. a fourth dual-mode resonator; 5. a fifth dual-mode resonator; 6. a first interdigitated tap; 7. the second finger tap.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
As shown in fig. 1 to 8, the high-temperature superconducting ultra-wideband band-pass filter based on dual-mode resonators includes a first dual-mode resonator 1, a second dual-mode resonator 2, a third dual-mode resonator 3, a fourth dual-mode resonator 4, and a fifth dual-mode resonator 5, which are connected in parallel, where one end of the first dual-mode resonator 1 is connected to a first interdigital tap 6, the other end of the first dual-mode resonator 1 is connected to the second dual-mode resonator 2 in a coupling manner, the third dual-mode resonator 3 is connected to the second dual-mode resonator 2 and the fourth dual-mode resonator 4 in a coupling manner, one end of the fifth dual-mode resonator 5 is connected to the fourth dual-mode resonator 4 in a coupling manner, and the other end of the fifth dual-mode resonator 5 is connected to a second interdigital tap 7.
By adopting a dual-mode SIR technology, 5 broadband dual-mode resonators with the resonant frequency of 3.1GHz-10.6GHz are designed and manufactured on a MgO substrate with a diameter of 2 inches and a thickness of 0.5 millimeter and provided with a double-sided YBCO film, the dual-mode resonators are connected in a mode of combining an interdigital structure and a coupling structure so as to conveniently realize the required coupling degree, the circuit size is miniaturized, and the multi-mode single-pass UWB filter in the same passband is realized by adopting the parallel multi-mode resonators. The ultra-wideband filter of the parallel multi-mode resonator has better out-of-band rejection performance than the filter of the multi-mode single resonator. In addition, because the high-temperature superconducting material has the characteristics of small surface resistance and high quality factor, the manufactured high-order filter has small loss, the filter has the passband insertion loss of 0.25dB, the relative bandwidth of 117 percent and steep roll-off of a sideband, and can meet the requirements of high-order high selectivity and small size.
The circuit model of the n-order bimodal low-pass prototype is shown in fig. 2. It consists of a resonator (consisting of Li, Ci, Li 'and Ci') and an admittance converter (mij). A frequency conversion function from a low-pass prototype to a band-pass of the single-mode Chebyshev parallel structure filter adopts a formula, wherein omega is frequency, omega is a normalized low-pass frequency variable, and gamma is a normalized coefficient. FBW is the relative bandwidth, which can be derived from a formula.
For the multimode, broadband bandpass filter shown in fig. 2, the conversion between the bandpass filter and the low-pass prototype is shown as a formula. γ is a scaling factor determined by | Ω (ω) | 1, and ω m is an important parameter affecting the entire passband transmission zero, and its value can be calculated by a formula. For the multimode resonator, as shown in fig. 3, ω 1 and ω 2 represent resonance poles of the resonator, and ω 1 'and ω 2' represent resonance zeros of the resonator, it can be seen that transmission poles of the multimode resonator are 3.1GHz and 10.6 GHz.
For a multimode resonator, the external figure of merit is defined as follows, and when the lengths S of the fingers in the externally coupled finger structure are different, the curves of Qe1, Qe1 and Qe values versus S of the resonator are shown in fig. 4.
When the two dual-mode resonator coupling resonators are in close proximity, the coupling coefficient k is obtained according to the formula, where f +1, f +2, f-1 and f-2 are the resonant frequencies at which the two single/dual-mode resonators are coupled together as shown in fig. 5. When two resonators are close to each other, the resonance characteristic as shown in fig. 5 obtains the resonance frequency, and then the coupling coefficient between the resonators can be calculated by a formula. When the horizontal distance d between two resonators and the vertical distance m between the resonators take different values, the relationship between the coupling coefficient and the corresponding resonator is as shown in fig. 6.
A5-order UWB filter with the center frequency of 6.85GHz and the relative bandwidth of 117% is designed by adopting a traditional low-pass matrix. According to ω m being 10.6GHz and the scaling factor γ being set to 1.515, a passband of 3.1GHz to 10.6GHz is formed. According to the formula, the external quality factor Qe is obtained as 1.53. The measurement results and simulation results of the high-temperature superconducting ultra-wideband band-pass filter based on the dual-mode resonator without tuning at the temperature of 77K are shown in FIG. 7. The filter has good performance and good rejection level and selectivity at the high end of the passband. The 3dB passband was 3.1 to 10.6GHz (117% relative bandwidth (FBW)), the maximum in-band insertion loss was 0.25dB, the sideband suppression was up to 60dB, and the measured return loss was better than 18.5dB, as shown in fig. 8. Furthermore, the group delay within the UWB passband is between 0.6ns and 1.1ns, as shown in FIG. 7.
According to the theory of designing a filter by a parallel coupling matrix method, a high-temperature superconducting ultra-wideband band-pass filter based on a dual-mode resonator is manufactured and simulated by adopting a YBCO/MgO/YBCO HTS substrate design, and 5-order ultra-wideband multi-mode filtering is realized, and the filter has the advantages of 0.25dB passband insertion loss, 117% relative bandwidth and steep roll-off of a sideband. Compared with the prior filter, the filter has compact structure, simple design and good application prospect in a communication system.
In one embodiment, the resonant frequency of the first dual-mode resonator 1 is 3.1GHz-10.7GHz, and the resonant frequencies of the first dual-mode resonator 1 and the second dual-mode resonator 2, the third dual-mode resonator 3, the fourth dual-mode resonator 4, and the fifth dual-mode resonator 5 are the same.
The filtering requirement of the broadband can be met.
In one embodiment, the first dual-mode resonator 1 and the second dual-mode resonator 2 are located on two symmetrical planes, the first dual-mode resonator 1, the third dual-mode resonator 3, and the fifth dual-mode resonator 5 are located on the same side, and the second dual-mode resonator 2 and the fourth dual-mode resonator 4 are located on the same side.
The channel interference is reduced, the size is reduced, and the requirement of miniaturization is met.
In one embodiment, the filter further comprises a MgO substrate of a double-sided YBCO high-temperature superconducting thin film with a thickness of 0.5mm, and the first dual-mode resonator 1, the second dual-mode resonator 2, the third dual-mode resonator 3, the fourth dual-mode resonator 4, the fifth dual-mode resonator 5, the first interdigital tap 6 and the second interdigital tap 7 are respectively imprinted on the substrate.
The filter is designed on an MgO substrate with a dielectric constant of 9.8 and a thickness of 0.5 mm. Superconducting thin films of YBCO (500nm thick) were deposited on both sides of a 0.5mm MgO substrate with overall circuit dimensions of 9.1mm x 6.66mm (0.376 λ gcx0.284 λ gc, λ gc being the waveguiding wavelength at f 0). One side of the high-temperature superconducting film is printed into a filter circuit by the standard process of photoetching and ion etching, and the other side is used for grounding, and then the filter is packaged in a metal shielding box. The first double-mode resonator 1, the second double-mode resonator 2, the third double-mode resonator 3, the fourth double-mode resonator 4, the fifth double-mode resonator 5, the first interdigital tap 6 and the second interdigital tap 7 are respectively printed on a substrate, so that low insertion loss and wide upper stop band can be realized.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (4)
1. The high-temperature superconducting ultra-wideband band-pass filter based on the dual-mode resonators is characterized by comprising a first dual-mode resonator, a second dual-mode resonator, a third dual-mode resonator, a fourth dual-mode resonator and a fifth dual-mode resonator which are connected in parallel, wherein one end of the first dual-mode resonator is connected with a first interdigital tap, the other end of the first dual-mode resonator is connected with the second dual-mode resonator in a coupling mode, the third dual-mode resonator is respectively connected with the second dual-mode resonator and the fourth dual-mode resonator in a coupling mode, one end of the fifth dual-mode resonator is connected with the fourth dual-mode resonator in a coupling mode, and the other end of the fifth dual-mode resonator is connected with a second interdigital tap.
2. The dual-mode resonator-based high-temperature superconducting ultra-wideband bandpass filter according to claim 1, wherein the resonant frequency of the first dual-mode resonator is 3.1GHz-10.6GHz, and the resonant frequencies of the first dual-mode resonator are consistent with the resonant frequencies of the second dual-mode resonator, the third dual-mode resonator, the fourth dual-mode resonator and the fifth dual-mode resonator.
3. The dual-mode resonator-based high-temperature superconducting ultra-wideband band-pass filter according to claim 1, wherein the first dual-mode resonator and the second dual-mode resonator are disposed on two symmetrical planes, the first dual-mode resonator, the third dual-mode resonator and the fifth dual-mode resonator are disposed on the same side, and the second dual-mode resonator and the fourth dual-mode resonator are disposed on the same side.
4. The dual-mode resonator-based high-temperature superconducting ultra-wideband band-pass filter according to claim 1, further comprising a MgO substrate of a double-sided YBCO high-temperature superconducting thin film with a thickness of 0.5mm, wherein the first dual-mode resonator, the second dual-mode resonator, the third dual-mode resonator, the fourth dual-mode resonator, the fifth dual-mode resonator, the first interdigital tap and the second interdigital tap are respectively etched on the substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921770842.XU CN210379364U (en) | 2019-10-22 | 2019-10-22 | High-temperature superconducting ultra-wideband band-pass filter based on dual-mode resonator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921770842.XU CN210379364U (en) | 2019-10-22 | 2019-10-22 | High-temperature superconducting ultra-wideband band-pass filter based on dual-mode resonator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210379364U true CN210379364U (en) | 2020-04-21 |
Family
ID=70256607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921770842.XU Expired - Fee Related CN210379364U (en) | 2019-10-22 | 2019-10-22 | High-temperature superconducting ultra-wideband band-pass filter based on dual-mode resonator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210379364U (en) |
-
2019
- 2019-10-22 CN CN201921770842.XU patent/CN210379364U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Chu et al. | Design of UWB bandpass filter using stepped-impedance stub-loaded resonator | |
| Yang et al. | Small ultra-wideband (UWB) bandpass filter with notched band | |
| CN103367844B (en) | Multi-branch loading-based three passband high-temperature superconductive filter | |
| Zhu et al. | Microstrip interdigital hairpin resonator with an optimal physical length | |
| CN110380169B (en) | Trapped wave frequency adjustable ultra-wideband filter with improved band elimination characteristic | |
| Cai et al. | Synthesis and realization of novel ultra-wideband bandpass filters using 3/4 wavelength parallel-coupled line resonators | |
| Tang et al. | Parallel-coupled stacked SIRs bandpass filters with open-loop resonators for suppression of spurious responses | |
| Hong et al. | Microstrip slow-wave open-loop resonator filters | |
| Tang et al. | A microstrip bandpass filter with ultra-wide stopband | |
| Yang et al. | Novel compact microstrip interdigital bandstop filters | |
| Kojima et al. | A compact 28GHz bandpass filter using quartz folded waveguide | |
| CN211578938U (en) | Ultra-wideband high-power directional coupler | |
| Kawaguchi et al. | Narrowband superconducting receiving filter for 9GHz-band weather radar | |
| CN210379364U (en) | High-temperature superconducting ultra-wideband band-pass filter based on dual-mode resonator | |
| CN107634293A (en) | A kind of Mini Microstrip low pass filter with two transmission zeros | |
| CN201222527Y (en) | Microstrip groove cross coupling loop microwave band-pass filter | |
| CN110854486A (en) | High-temperature superconducting ultra-wideband band-pass filter based on dual-mode resonator | |
| CN212305276U (en) | Band-pass filter and filter | |
| CN209747694U (en) | Low-pass filter with complementary split resonant ring and U-shaped groove defected ground | |
| Matsutani et al. | Miniaturized quartz waveguide filter using double-folded structure | |
| CN114512779A (en) | High-selectivity broadband LTCC (low temperature co-fired ceramic) filtering power divider integrated chip | |
| CN207165726U (en) | Super wide band microstrip bandpass filter | |
| CN103326090B (en) | Tee joint band high-temperature superconducting filter | |
| CN215266609U (en) | Cross multimode band-pass filter | |
| CN210984905U (en) | Ultra-wideband duplexer with branch load ring resonator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200421 Termination date: 20211022 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |