CN220400873U - Miniaturized quarter-mode square SIW resonant cavity and band-pass filter - Google Patents
Miniaturized quarter-mode square SIW resonant cavity and band-pass filter Download PDFInfo
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- CN220400873U CN220400873U CN202320809784.7U CN202320809784U CN220400873U CN 220400873 U CN220400873 U CN 220400873U CN 202320809784 U CN202320809784 U CN 202320809784U CN 220400873 U CN220400873 U CN 220400873U
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Abstract
The utility model provides a miniaturized quarter-mode square SIW resonant cavity and a band-pass filter. The miniaturized quarter-mode square SIW resonant cavity comprises: a quarter-die square SIW cavity, wherein a metalized through hole is formed at one vertex of the quarter-die square SIW cavity to form an electric wall, a periodic metal through hole array is arranged along the edges of two adjacent sides where the other vertex which is diagonal to the vertex provided with the metal through hole is located, and a slit which is in an L shape overall is etched at one side of the periodic through hole array to form a magnetic wall; the quarter-mode square SIW cavity is obtained by cutting the square SIW resonant cavity along equivalent magnetic walls which are perpendicular to each other.
Description
Technical Field
The utility model relates to the technical field of electromagnetic fields and microwaves, in particular to a miniaturized quarter-mode square SIW resonant cavity and a band-pass filter.
Background
With the high-speed development of the communication industry, the low frequency band of the radio spectrum is approaching saturation, the requirements for exploration of high frequency bands such as microwave and millimeter wave are increasing, and an important point for satellite radar and 5G communication technology is also on development and utilization of microwave and millimeter wave. The miniaturization and high integration of mobile devices also put higher and higher demands on the size of radio frequency microwave devices, and the miniaturization and high power capacity of radio frequency microwave devices are also important for various engineering design indexes.
At present, most of the design and application of circuit systems utilize microstrip line technology, microstrip lines have the advantages of easy integration, easy processing design, low cost and the like, but in a high frequency range, the microstrip lines have overlarge loss due to an open structure and do not meet engineering design index requirements, as early as the early 21 st century, the teaching of Wu Ke of the university of Montreal, canadian and the teaching of Hong Wei of the university of southeast are used for providing the concept of a substrate integrated waveguide (Substrate Intergrated Waveguide, SIW) on the basis of researching the integration problem between a microstrip planar circuit and a non-planar circuit, and the SIW has the advantages of greatly reducing the loss of microwave devices by adding a periodic metal through hole array, but is different from the large volume of the traditional rectangular waveguide, and the SIW technology has high Q value, low loss and simple structure and is easy to integrate and miniaturize. Techniques for Half-mode substrate integrated waveguide (Half-mode Substrate Intergrated Waveguide, HMSIW) and Quarter-mode substrate integrated waveguide (quater-mode Substrate Intergrated Waveguide, QMSIW) have been proposed later, which further reduce the size of the microwave device while retaining the original advantages.
The filter is a frequency selecting device, is in an indispensable position in the whole radio frequency circuit, has more researches on single-mode filters at home and abroad at present, is relatively cool in comparison with the researches on multi-mode filters, and has important significance in the fields of miniaturization, ultra-wideband and multi-band design of the filters.
Disclosure of Invention
In order to further achieve miniaturization of the filter, the utility model provides a miniaturized quarter-mode square SIW resonant cavity and a band-pass filter.
In one aspect, the utility model provides a miniaturized quarter-mode square SIW resonator comprising: a quarter-die square SIW cavity, wherein a metal through hole is arranged at one vertex of the quarter-die square SIW cavity to form an electric wall, a periodic metal through hole array is arranged along the edges of two adjacent sides where the other vertex which is diagonal to the vertex provided with the metal through hole is positioned, and a slit which is in an L shape overall is etched at one side of the periodic through hole array to form a magnetic wall; the quarter-mode square SIW cavity is obtained by cutting the square SIW resonant cavity along equivalent magnetic walls which are perpendicular to each other.
Further, the L-shaped gap is positioned on one side of the periodic metal through hole array, which is close to the center of the quarter-mode square SIW cavity.
On the other hand, the utility model provides a miniaturized quarter-mode square SIW band-pass filter, which comprises the miniaturized quarter-mode square SIW resonant cavity, wherein the center of the square SIW resonant cavity is used as the center of a circle, and a first periodic metal through hole array is arranged along the circumferential direction; four second periodic metal through hole arrays are arranged on the outer side of the first periodic metal through hole array along two diagonal directions of the square SIW resonant cavity; microstrip feeder lines are respectively arranged on two adjacent sides where vertexes provided with metal through holes are located.
The utility model has the beneficial effects that:
(1) Compared with the traditional SIW-based designed filter, the utility model reduces the volume of the filter by using the quarter-mode square SIW resonant cavity, and realizes the simplification and miniaturization of the filter design by arranging three modes of excitation of different periodic metal through holes in the center of the cavity.
(2) The miniaturized quarter-mode square SIW three-mode band-pass filter can achieve 25% of relative bandwidth, and achieve return loss smaller than-20 dB at 25% of relative bandwidth, and harmonic frequency is 4.4GHz.
Drawings
FIG. 1 is a schematic diagram of a miniaturized quarter-mode square SIW resonator according to an embodiment of the present utility model;
FIG. 2 is a schematic structural diagram of a third-order quarter-mode square SIW three-mode bandpass filter according to an embodiment of the utility model;
fig. 3 is an S-parameter diagram of a third-order quarter-mode square SIW three-mode bandpass filter according to an embodiment of the utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, an embodiment of the present utility model provides a quarter-mode square SIW resonator, including a quarter-mode square SIW cavity, in which a metal through hole is disposed at one vertex of the quarter-mode square SIW cavity to form an electric wall, a periodic metal through hole array is disposed along two adjacent edges where another vertex diagonal to the vertex where the metal through hole is disposed is located, and a slit which is overall in an "L" shape is etched at one side of the periodic through hole array to form a magnetic wall; the quarter-mode square SIW cavity is obtained by cutting the square SIW resonant cavity along equivalent magnetic walls which are perpendicular to each other.
The L-shaped gap is positioned on one side of the periodic metal through hole array, which is close to the center of the quarter-mode square SIW cavity.
The metal through hole not only can prevent electromagnetic leakage, but also can improve the quality factor of the resonant cavity. The quarter-mode square SIW cavity is formed by cutting the square SIW resonant cavity along the vertical and horizontal equivalent magnetic walls, the area of the quarter-mode square SIW cavity is reduced by 75% compared with that of the traditional square SIW resonant cavity, and the quarter-mode square SIW cavity is compact in structure and suitable for research design of a miniaturized filter.
Example 2
As shown in fig. 2, an embodiment of the present utility model provides a miniaturized quarter-mode square SIW band-pass filter, which includes a miniaturized quarter-mode square SIW resonant cavity in the foregoing embodiment, and a first periodic metal through-hole array is disposed along a circumferential direction with a center of the square SIW resonant cavity as a center of a circle; four second periodic metal through hole arrays are arranged on the outer side of the first periodic metal through hole array along two diagonal directions of the square SIW resonant cavity; microstrip feeder lines are respectively arranged on two adjacent sides where vertexes provided with metal through holes are located.
A single-cavity three-mode filter is realized by arranging a first periodic metal through hole array and a second periodic metal through hole array in a quarter-mode square SIW resonant cavity to excite three modes in the resonant cavity. The single-cavity multimode filter excites multiple mode resonances on one resonator, so that the size of the filter can be greatly reduced, the filter has great significance for the research of miniaturized filters, the single-cavity multimode structure is realized on the basis of QMSIW technology, the size of the filter can be further reduced, the three-mode resonance is realized due to the non-stationarity of multiple mode frequencies, and the transmission capability of the filter to signals is improved by possessing a relative bandwidth of 25%.
Example 3
Based on the above embodiments, the single-cavity three-mode filter provided by the embodiment of the utility model includes three layers in total, the top layer and the bottom layer are metal plates, the material is copper, the middle is a dielectric layer, and the material is Taconic RF-5.
And cutting the full-mode square SIW resonant cavity along the vertical and horizontal equivalent magnetic walls to reduce the volume of the full-mode square SIW resonant cavity by 75%, forming a quarter-mode square SIW cavity, enabling quarter rectangular gaps etched along the periphery to be equivalent to the magnetic walls of the resonant cavity, and arranging periodic metal through holes in the cavity, wherein the periodic metal through holes are arranged into a circle and the periodic metal through holes are arranged on the diagonal of the square SIW resonant cavity so as to realize excitation regulation and control of three modes.
Wherein L is the second periodic array of metal vias as shown in FIG. 2The overall length (also the distance from the metal vias arranged on the diagonal to the intersection of the adjacent edges in the cavity), le represents the distance between the microstrip feed line and the apex where the metal vias are located, W 0 Is the width of microstrip feeder line, W 1 Is the width of a quarter rectangular gap etched along the periphery, r 0 For the radius, r, of each metal via in the array of metal vias 1 Representing the radius of a metal via at the apex, r 2 Representing the radius of the circle formed by the first periodic array of metal vias. By adjusting L, r 2 The frequency of the three modes can be regulated and controlled, and the three modes are excited; width W of microstrip feeder 0 Can be obtained from the thickness, dielectric constant and resonant frequency of the dielectric substrate by adjusting the parameter W 0 The 50 q impedance matching can be performed better.
As an embodiment, the single-cavity three-mode bandpass filter uses a thickness h=0.787 mm, a relative dielectric constant ε r A single layer Taconic RF-5 dielectric substrate having a loss tangent tan delta=0.0009.
Fig. 3 is an S-parameter diagram of the three-mode bandpass filter. The three-mode band-pass filter comprises the following implementation indexes: the relative bandwidth of the operating frequency at 4.4GHz and the-3 dB is 25%, the in-band insertion loss of the filter is-1.5 dB, and the return loss in the passband is better than-20 dB. The dimensional parameters of the three-mode bandpass filter are shown in table 1:
TABLE 1 three-mode QMSIW bandpass filter size parameters (Unit: mm)
| Parameter name | L | Le | W 0 | W 1 | r 0 |
| Numerical value | 10 | 17 | 0.8 | 0.35 | 0.35 |
| Parameter name | r 1 | r 2 | \ | \ | \ |
| Numerical value | 0.4 | 4 | \ | \ | \ |
Due to the adoption of the quarter-mode structure, the miniaturization of the filter is realized, and the plane size of the band-pass filter without the microstrip feeder line is 30mm. According to the S parameter result, the filter working frequency is at 4.4GHz, the-3 dB relative bandwidth is 25%, the in-band insertion loss of the filter is-1.5 dB, and the return loss in the passband is better than-20 dB. Therefore, the three-mode QMIW band-pass filter provided by the embodiment of the utility model realizes a single-cavity three-mode structure and accords with corresponding design indexes, and has good application prospect in a wireless communication system.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (3)
1. A miniaturized quarter-mode square SIW resonator, comprising: a quarter-die square SIW cavity, wherein a metal through hole is arranged at one vertex of the quarter-die square SIW cavity to form an electric wall, a periodic metal through hole array is arranged along the edges of two adjacent sides where the other vertex which is diagonal to the vertex provided with the metal through hole is positioned, and a slit which is in an L shape overall is etched at one side of the periodic metal through hole array to form a magnetic wall; the quarter-mode square SIW cavity is obtained by cutting the square SIW resonant cavity along equivalent magnetic walls which are perpendicular to each other.
2. A miniaturized quarter-mode square SIW resonator according to claim 1, characterized in that the "L" -shaped slot is located on the side of the periodic array of metal vias close to the centre of the quarter-mode square SIW cavity.
3. A miniaturized quarter-mode square SIW bandpass filter, characterized by comprising a miniaturized quarter-mode square SIW resonator as claimed in claim 1 or 2, wherein a first periodic array of metal vias is arranged along the circumferential direction with the center of the square SIW resonator as the center; four second periodic metal through hole arrays are arranged on the outer side of the first periodic metal through hole array along two diagonal directions of the square SIW resonant cavity; microstrip feeder lines are respectively arranged on two adjacent sides where vertexes provided with metal through holes are located.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320809784.7U CN220400873U (en) | 2023-04-12 | 2023-04-12 | Miniaturized quarter-mode square SIW resonant cavity and band-pass filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320809784.7U CN220400873U (en) | 2023-04-12 | 2023-04-12 | Miniaturized quarter-mode square SIW resonant cavity and band-pass filter |
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| CN220400873U true CN220400873U (en) | 2024-01-26 |
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| CN202320809784.7U Active CN220400873U (en) | 2023-04-12 | 2023-04-12 | Miniaturized quarter-mode square SIW resonant cavity and band-pass filter |
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