阅读说明：本技术 基于双模谐振器的高温超导超宽带带通滤波器 (High-temperature superconducting ultra-wideband band-pass filter based on dual-mode resonator ) 是由 吴航 冯丽君 黄文兴 韩衍霜 于 2019-10-22 设计创作，主要内容包括：本发明公开了一种基于双模谐振器的高温超导超宽带带通滤波器,包括相互并联的第一双模谐振器、第二双模谐振器、第三双模谐振器、第四双模谐振器和第五双模谐振器,所述第一双模谐振器的一端与第一叉指抽头连接,所述第一双模谐振器的另一端与所述第二双模谐振器耦合连接,所述第三双模谐振器分别与所述第二双模谐振器、第四双模谐振器耦合连接,所述第五双模谐振器的一端与所述第四双模谐振器耦合连接,所述第五双模谐振器的另一端与第二叉指抽头连接。本发明可满足小尺寸、高选择性以及低插损的要求,具有良好的性能,在通带高端有很好的滤波选择性和高抑制性。(The invention discloses a high-temperature superconducting ultra-wideband band-pass filter based on a dual-mode resonator, which 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 invention 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 the passband.)

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.

Technical Field

The invention relates to the technical field of filters, in particular to a high-temperature superconducting ultra-wideband band-pass filter based on a dual-mode resonator.

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.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a high-temperature superconducting ultra-wideband band-pass filter based on a dual-mode resonator, which 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 passband.

The technical scheme adopted by the invention is as follows:

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 invention has the beneficial effects 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 graph of the frequency response of a dual-mode resonator and the group delay 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 the fingers in an externally coupled finger structure in accordance with an embodiment of the present invention;

FIG. 5 is a graph illustrating the change in resonant frequency when two single/dual mode resonators are coupled together according to an embodiment of the present invention;

FIG. 6 is a graph of the coupling coefficient versus the horizontal and vertical distances between two resonators according to an embodiment of the present invention;

FIG. 7 is a graph of insertion/return loss measurements and simulation results for an embodiment of the present invention;

fig. 8 is a graph of measurement and simulation results for group delay according to an 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.