阅读说明：本技术 一种具有可重构陷波带的小型化超宽带带通滤波器 (Miniaturized ultra wide band-pass filter with reconfigurable trapped wave band ) 是由 杨涛 李群 刘斌 张希琳 龙羽 于 2019-11-07 设计创作，主要内容包括：本发明公开了一种具有可重构陷波带的小型化超宽带带通滤波器,包括50Ω微带线、微带线到半模基片集成波导过渡段、半模基片集成波导、三个半波长槽谐振器和三个可重构陷波单元。本发明的超宽带带通滤波器的最低通带频率由半模基片集成波导的宽度决定,而最高通带频率由三个半波长槽谐振器决定。利用三个可重构陷波单元与微带线到半模基片集成波导过渡段和半模基片集成波导相耦合,产生频率和带宽可重构的陷波带。通过改变直流偏置电压,可以调节变容二极管的电容值,从而调节陷波带的频率和带宽响应。(The invention discloses a miniaturized ultra-wideband band-pass filter with a reconfigurable notch band, which comprises a 50 omega microstrip line, a transition section from the microstrip line to a half-mode substrate integrated waveguide, three half-wavelength long groove resonators and three reconfigurable notch units. The lowest passband frequency of the ultra-wideband band-pass filter is determined by the width of the half-mode substrate integrated waveguide, and the highest passband frequency is determined by the three half-wavelength slot resonators. Three reconfigurable notch units are coupled with a transition section from the microstrip line to the half-mode substrate integrated waveguide and the half-mode substrate integrated waveguide to generate notch bands with reconfigurable frequency and bandwidth. By changing the DC bias voltage, the capacitance of the varactor can be adjusted, thereby adjusting the frequency and bandwidth response of the notch band.)

1. A miniaturized ultra-wideband band-pass filter with a reconfigurable notch band, characterized by: comprises a half-mode substrate integrated waveguide (3) with a convex microstrip line (1); a transition section (2) from the microstrip line with a bevel edge structure to the half-mode substrate integrated waveguide is arranged between the convex microstrip line (1) and the half-mode substrate integrated waveguide (3); the half-die substrate integrated waveguide (3) is provided with a half-wavelength slot resonator (4); the transition section (2) from the microstrip line to the half-mode substrate integrated waveguide and the half-mode substrate integrated waveguide (3) have a common linear edge; and a reconfigurable notch unit (5) is coupled with the relative position gap of the half-die substrate integrated waveguide (3).

2. A miniaturized ultra-wideband band-pass filter with a reconfigurable notch band as claimed in claim 1, characterized in that: the reconfigurable notch unit (5) comprises a section with the length L₂Width of W₂One end of the coupling microstrip line segment is connected with a microstrip line segment of which the terminal is grounded by a via hole through a variable capacitance diode, and the other end of the coupling microstrip line segment is connected with a resistor.

3. A miniaturized ultra-wideband band-pass filter with a reconfigurable notch band as claimed in claim 2, characterized in that: and the resistor connected with the coupling microstrip line segment is connected with the direct current bias circuit.

4. A miniaturized ultra-wideband band-pass filter with a reconfigurable notch band according to any of claims 1 to 3, characterized in that: the reconfigurable trap wave units (5) are not less than two groups and are distributed in an axisymmetric manner by taking the symmetry axis of the half-mode substrate integrated waveguide (3) as an axis.

5. A miniaturized ultra-wideband band-pass filter with a reconfigurable notch band as claimed in claim 4, characterized in that: the reconfigurable notch unit (5) comprises 3-5 groups.

6. A miniaturized ultra-wideband band-pass filter with a reconfigurable notch band according to any of claims 1 to 5, characterized in that: the half-wavelength long groove resonators (4) are not less than two groups and are distributed in an axisymmetric manner by taking the symmetry axis of the half-mode substrate integrated waveguide (3) as an axis.

7. A miniaturized ultra-wideband band-pass filter with a reconfigurable notch band as claimed in claim 6, characterized in that: the half-wavelength slot resonators (4) comprise 3-5 groups.

8. A miniaturized ultra-wideband band-pass filter with a reconfigurable notch band as claimed in any one of claims 1 to 7, characterized in that: the coupling distance d1 of the gap coupling is 0.05mm to 0.5 mm.

Technical Field

The invention relates to the microwave device technology, in particular to a miniaturized ultra-wideband band-pass filter with a reconfigurable notch band.

Background

The ultra-wideband band-pass filter is a key device forming an ultra-wideband system, and plays an important role in the performance of the ultra-wideband system, such as frequency selection characteristic, insertion loss and the like. The frequency range of conventional ultra-wideband is 3.1GHz-10.6 GHz. Due to the wide frequency range of ultra-wideband and the high exploitation and utilization of spectrum resources, interference signals exist in ultra-wideband systems. To suppress the interference signal, a notch band needs to be introduced at the frequency of the interference signal. At present, the existing ultra-wideband band-pass filter mainly adopts a multi-mode resonator technology and a high-pass filter cascaded low-pass filter technology, and the size and the insertion loss of the existing ultra-wideband band-pass filter are large. Meanwhile, the introduced notch band has the problem of fixed frequency band or narrow adjustable range.

An Ultra-wideband band-pass filter with a notch band is provided according to H.Zhu, and Q.X.Chu, Ultra-wideband band filter with a notch-side using stub-loaded resonator, IEEE micro. The insertion loss of the pass band is less than 1.5dB, the return loss is more than 10dB, and the size is 0.514 lambda₀×0.312λ₀，λ₀The wavelength of the electromagnetic wave in free space is 6.85 GHz. A fixed notch band was introduced at a center frequency of 5.5GHz, with a relative bandwidth of 6.7% for a 10dB rejection. The size and the insertion loss of the ultra-wideband band-pass filter with the notch band designed by the method are large, and the frequency band of the notch band is fixed.

Disclosure of Invention

The invention aims to solve the technical problem of providing a miniaturized ultra-wideband band-pass filter with a reconfigurable notch band, and solves the problems of large size and insertion loss of a pass band, fixed frequency band or narrow adjustable range of the notch band and the like in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a miniaturized ultra-wideband band-pass filter with a reconfigurable notch band comprises a half-mode substrate integrated waveguide with a convex microstrip line; a transition section from the microstrip line with a bevel edge structure to the half-mode substrate integrated waveguide is arranged between the convex microstrip line and the half-mode substrate integrated waveguide; the half-mode substrate integrated waveguide comprises three half-wavelength long groove resonators; the transition section from the microstrip line to the half-mode substrate integrated waveguide and the half-mode substrate integrated waveguide have a common linear edge; three reconfigurable notch units are coupled at the relative position gap of the half-die substrate integrated waveguide.

The optimization means adopted further comprises: the reconfigurable notch unit comprises a section with length L₂Width of W₂One end of the coupling microstrip line segment is connected with a microstrip line segment of which the terminal is grounded by a via hole through a variable capacitance diode, and the other end of the coupling microstrip line segment is connected with a resistor.

The reconfigurable trap wave units are not less than two groups and are distributed in a symmetrical mode by taking the symmetrical axis of the half-mode substrate integrated waveguide as an axis, and 3-5 groups are preferred.

The half-wavelength slot resonators are not less than two groups and are distributed in a symmetrical mode by taking the symmetrical axis of the half-mode substrate integrated waveguide as an axis, and 3-5 groups are preferred. Gap-coupled coupling gap d₁Is 0.05mm to 0.5 mm.

The principle of the technical scheme of the invention is as follows: the ultra-wideband band-pass filter designs the cut-off frequency of the half-mode substrate integrated waveguide, and designs the lowest frequency of a pass band to be 3.1 GHz. By introducing three half-wavelength slot resonators in the half-mode substrate integrated waveguide, a high-frequency stop band is created, thereby designing the highest frequency of the pass band to be 10.6 GHz. Three reconfigurable notch units are coupled with a transition section from the microstrip line to the half-mode substrate integrated waveguide and the half-mode substrate integrated waveguide to generate notch bands with reconfigurable frequency and bandwidth. By changing the DC bias voltage, the capacitance of the varactor can be adjusted, thereby adjusting the frequency and bandwidth response of the notch band.

The invention has the advantages and beneficial effects that:

(1) the ultra-wideband band-pass filter with the reconfigurable notch band realizes miniaturization and low insertion loss of the passband by the half-mode substrate integrated waveguide and introducing the slot resonator into the half-mode substrate integrated waveguide.

(2) In the trap band, three reconfigurable trap units are coupled with a transition section from a microstrip line to a half-mode substrate integrated waveguide and a half-mode substrate integrated waveguide to generate the trap band with reconfigurable frequency and bandwidth, and the trap band has a compact structure and a large tuning range.

Drawings

FIG. 1 is a schematic diagram of the general structure of the present invention;

FIG. 2 is a simulation diagram of the frequency tuning of the reconfigurable notch band of the present invention;

FIG. 3 is a bandwidth adjustment simulation of the reconfigurable notch band of the present invention;

FIG. 4 is a frequency tuning test plot of a reconfigurable notch band of the present invention;

figure 5 is a bandwidth adjustment test chart of the reconfigurable notch band of the present invention.

Description of reference numerals: the system comprises a microstrip line 1, a microstrip line-to-half-mode substrate integrated waveguide transition section 2, a half-mode substrate integrated waveguide 3, a half-wavelength slot resonator 4 and a reconfigurable notch unit 5.

Detailed Description

In order to make the objects, technical problems to be solved, and technical solutions of the present invention clearer, the present invention is further described below with reference to the accompanying drawings and specific embodiments.