CN111584984B - Zero-controllable miniaturized ridge waveguide 5G dual-frequency band-pass filter - Google Patents
Zero-controllable miniaturized ridge waveguide 5G dual-frequency band-pass filter Download PDFInfo
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- CN111584984B CN111584984B CN202010499678.4A CN202010499678A CN111584984B CN 111584984 B CN111584984 B CN 111584984B CN 202010499678 A CN202010499678 A CN 202010499678A CN 111584984 B CN111584984 B CN 111584984B
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- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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- H01P1/207—Hollow waveguide filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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Abstract
The invention discloses a zero-controllable miniaturized ridge waveguide 5G dual-frequency band-pass filter. The invention comprises three groups of non-contact ridge waveguides and transverse ridge waveguides which are arranged in a metal cavity and used for zero point control; a transverse ridge waveguide for zero point control is externally connected in an input channel and is connected with a first group of ridge waveguides for controlling high frequency through a first longitudinal ridge waveguide; the first longitudinal ridge waveguide has the same height as the first set of ridge waveguides, does not affect the low frequency when in a specific position, and enhances coupling so that the amplitude of the first longitudinal ridge waveguide is zero at a specific frequency point of the high frequency band. The ridge structure is adopted to complete the transmission and the coupling of signals, the miniaturization of the dual-frequency filter is realized, and the ridge waveguide has a relatively wide spurious-free working frequency window to allow the realization of broadband filtering, so the filter completes the low-insertion-loss dual-passband filtering of 2.515GHz-2.675GHz and 3.6GHz-3.8 GHz.
Description
Technical Field
The invention belongs to the technical field of microwave devices, and particularly relates to a dual-frequency filter designed by using a ridge waveguide and a zero control groove.
Background
With the rapid development of wireless communication technology towards high speed, broadband and large capacity trends, such as the emerging 5G technology, the demand for dual-band and even multi-band filters is increasing. The existing cross-coupling filter introduces a limited transmission zero point by using cross coupling, the performance can also meet the requirement, but the independent control of the resonant frequency of each pass band is difficult to realize, and the zero point is influenced by the structure of the whole filter, so that the modular design and debugging can not be carried out, and the inconvenience is brought to the engineering. Although the substrate integrated waveguide filter has small volume and low cost, and the frequency band can also meet the requirements, the insertion loss is higher. At present, the zero point of the single-frequency filter can be realized by adopting methods such as cross coupling, suppression resonators and non-resonant nodes of CT and CQ topological structures, but the double-frequency filter does not have a related technology to improve the out-of-band suppression performance.
Disclosure of Invention
The invention aims to overcome the defect that the conventional double-frequency filter cannot realize zero point controllability, does not have double-passband filters of 2.515GHz-2.675GHz and 3.6GHz-3.8GHz, and designs a novel miniaturized ridge waveguide 5G double-frequency band-pass filter. The filter has the advantages of small insertion loss, wide bandwidth of two pass bands, strong suppression on stray waves, controllable zero point and easy debugging.
The technical scheme adopted by the invention is as follows:
a zero-controllable miniaturized ridge waveguide 5G dual-frequency band-pass filter comprises a metal cavity (1), an input structure (13), an output structure (14), three groups of non-contact ridge waveguides and a transverse ridge waveguide (5) for zero control, wherein the three groups of non-contact ridge waveguides are arranged in the metal cavity (1);
the first group of ridge waveguides comprises two first transverse ridge waveguides (2) which are arranged in parallel and do not contact with each other, and a second transverse ridge waveguide (10) which is arranged between the two first transverse ridge waveguides (2) and does not contact with the first transverse ridge waveguides (2); one of the first transverse ridge waveguides (2) is connected with a transverse ridge waveguide (5) for zero point control through a first longitudinal ridge waveguide (7); one end of the second transverse ridge waveguide (10) is in contact with the inner wall of the metal cavity (1); the second transverse ridge waveguide (10) and the metal cavity (1) are the same in height;
in order to introduce the zero point, a transverse ridge waveguide (5) for zero point control is externally connected in an input channel and is connected with a first group of ridge waveguides for controlling high frequency through a first longitudinal ridge waveguide (7); the height of the first longitudinal ridge waveguide (7) is the same as that of the first group of ridge waveguides, when the first longitudinal ridge waveguide is located at a specific position, the first longitudinal ridge waveguide does not affect the low frequency, the coupling is enhanced, the amplitude of the first longitudinal ridge waveguide at a specific frequency point of a high frequency band is enabled to be zero, and therefore a zero point control groove is formed.
The second group of ridge waveguides comprises two third transverse ridge waveguides (3) which are arranged in parallel and are not in contact with each other and a second longitudinal ridge waveguide (6) used for connecting the two third transverse ridge waveguides (3);
the third group of ridge waveguides comprises two fourth transverse ridge waveguides (4) which are arranged in parallel and are not in contact with each other and a third longitudinal ridge waveguide (8) used for connecting the two fourth transverse ridge waveguides (4);
the heights of the first group of ridge waveguides and the second group of ridge waveguides are mainly determined by a high-frequency band, and the height of the third group of ridge waveguides is mainly determined by a low-frequency band;
three ridge waveguide of group all are the symmetry form and distribute, form two passageways: one path completes low-frequency filtering, and the other path completes high-frequency filtering, so that the size of the filter is reduced.
A fourth longitudinal ridge waveguide (9) and a fifth longitudinal ridge waveguide (11) which are not in contact with the third group of ridge waveguides are respectively arranged on the two sides of the third group of ridge waveguides, and the centers of the fourth longitudinal ridge waveguide and the fifth longitudinal ridge waveguide are positioned on the symmetry axes of the three groups of ridge waveguides; the fourth longitudinal ridge waveguide (9) is attached to the inner wall of the metal cavity (1), and the fifth longitudinal ridge waveguide (11) is located between the second group of ridge waveguides and the third group of ridge waveguides; the height of the fourth longitudinal ridge waveguide (9) is lower than that of the third group of ridge waveguides; the fifth longitudinal ridge waveguide (11) and the cavity (1) are the same in height.
The height of the fifth longitudinal ridge waveguide (11) is related to the insertion loss, and the fourth longitudinal ridge waveguide (9) is related to the frequency.
The input and output interfaces are completed by SMA interfaces, inner cores of the input interface (13) and the output interface (14) are respectively connected with the two first transverse ridge waveguides (2), and an outer core is connected with the metal cavity (1), so that energy loss is reduced.
A second transversal ridge waveguide (10) for enhanced coupling; the second longitudinal ridge waveguide (6) is used for reinforcing coupling, and the joint is subjected to chamfering treatment; the third longitudinal ridge waveguide (8) is used for reinforcing coupling, and the joint is chamfered.
And the joint of the first longitudinal ridge waveguide (7) and the zero control groove (5) is chamfered.
The first transversal ridge waveguide (2) is slot-coupled to the third transversal ridge waveguide (3).
And the fourth longitudinal ridge waveguide (9) and the third group of ridge waveguides are coupled through a gap, so that the bandwidth performance is effectively improved.
Tuning screws are arranged above one of the first transverse ridge waveguides (2), one of the third transverse ridge waveguides (3) and one of the fourth transverse ridge waveguides (4); the tuning screw adjusts the resonant frequency and the coupling coefficient.
And a tuning screw is arranged above the transverse ridge waveguide for realizing the zero control groove and is used for adjusting the position or the size of the zero control groove, controlling the movement of the zero point and improving the out-of-band rejection performance. Tuning screws are added between the second group of transverse ridge waveguides and the third group of transverse ridge waveguides; and a tuning screw is added between the third group of transverse ridge waveguides and the cavity wall to adjust the resonant frequency and the coupling coefficient.
The fifth longitudinal ridge waveguide (11) is coupled with the third group of ridge waveguides through a gap with a certain wavelength length, so that a first pass band is formed. The third group of ridge waveguides is coupled with a fourth longitudinal ridge waveguide (9) through a gap with a certain wavelength length, so that a second pass band is formed.
The invention has the beneficial effects that: 1. the ridge structure is adopted to complete the transmission and the coupling of signals, the miniaturization of the dual-frequency filter is realized, and the ridge waveguide has a relatively wide spurious-free working frequency window to allow the realization of broadband filtering, so the filter completes the low-insertion-loss dual-passband filtering of 2.515GHz-2.675GHz and 3.6GHz-3.8 GHz. 2. The design of the zero control groove is added, and the movement of the zero point can be controlled by changing the position or the size of the zero control groove connected with the ridge waveguide, so that the out-of-band rejection performance is improved. 3. A plurality of ridge waveguides which are symmetrically distributed are built in the metal cavity, the whole cavity is divided into two paths, one path completes low-frequency filtering, the other path completes high-frequency filtering, and the size of the filter is reduced. 4. The dual-passband isolation of the dual-band filter is high, and meanwhile, the two passbands can be correspondingly changed by adjusting the related structures. 5. The invention has small volume and light weight, and is convenient for batch manufacture.
Drawings
FIG. 1 is a schematic diagram of a filter structure;
FIG. 2 is a schematic diagram of the positions of the components of the filter;
FIG. 3 shows a filter S corresponding to that shown in FIG. 111A parameter test result;
FIG. 4 shows a filter S corresponding to that shown in FIG. 112A parameter test result;
FIG. 5 shows the results of a zero shift test for the filter shown in FIG. 1;
in the figure, a metal cavity 1, a first group of transverse ridge waveguides 2, a transverse ridge waveguide 10, a second group of transverse ridge waveguides 3, a longitudinal ridge waveguide 6, a longitudinal ridge waveguide 11, a third group of transverse ridge waveguides 4, a longitudinal ridge waveguide 8, a longitudinal ridge waveguide 9, a zero point control groove 5, a longitudinal ridge waveguide 7, a tuning screw 12, an input structure 13 and an output structure 14 are shown.
Detailed Description
To more clearly illustrate the problems solved by the present invention, the technical solutions adopted and the advantages, the following description is taken in conjunction with the illustrative embodiments of the present invention, the preferred embodiments described herein are only used for illustrating and explaining the present invention and are not used for limiting the present invention, and all modifications, equivalents, improvements and the like which are within the spirit and principle of the present invention are made. Are intended to be within the scope of the present invention.
As shown in fig. 1 and 2, in the miniaturized ridge waveguide 5G dual-band bandpass filter with controllable zero point, the metal cavity 1 is made of aluminum material, the size of the metal cavity is optimized according to the integrated coupling coefficient, and ridge waveguides are symmetrically distributed in the cavity.
The first group of ridge waveguides comprises two first transverse ridge waveguides 2 which are arranged in parallel and do not contact with each other, and a second transverse ridge waveguide 10 which is arranged between the two first transverse ridge waveguides 2 and does not contact with the first transverse ridge waveguides 2; one of the first transverse ridge waveguides 2 is connected with a transverse ridge waveguide 5 for zero point control through a first longitudinal ridge waveguide 7; one end of the second transversal ridge waveguide 10 is in contact with the inner wall of the metal cavity 1, thereby enhancing coupling. The second transverse ridge waveguide 10 has the same height as the metal cavity 1;
the first rib waveguide 2 is spaced from the second rib waveguide 10 by a wavelength length.
In order to introduce zero points, a transverse ridge waveguide 5 for zero point control is externally connected to an input channel and is connected with a first group of ridge waveguides for controlling high frequency through a first longitudinal ridge waveguide 7; the height of the first longitudinal ridge waveguide 7 is the same as that of the first group of ridge waveguides, when the first longitudinal ridge waveguide is located at a specific position, the first longitudinal ridge waveguide does not affect the low frequency, the coupling is enhanced, the amplitude of the first longitudinal ridge waveguide at a specific frequency point of a high frequency band is enabled to be zero, and therefore a zero point control groove is formed. The position of the zero point is changed by changing the size or position of the lateral ridge waveguide 5.
The second group of ridge waveguides comprises two third transverse ridge waveguides 3 which are arranged in parallel and are not in contact with each other, and a second longitudinal ridge waveguide 6 for connecting the two third transverse ridge waveguides 3;
the third group of ridge waveguides comprises two fourth transverse ridge waveguides 4 which are arranged in parallel and are not in contact with each other, and a third longitudinal ridge waveguide 8 for connecting the two fourth transverse ridge waveguides 4;
the heights of the first group of ridge waveguides and the second group of ridge waveguides are mainly determined by a high-frequency band, and the height of the third group of ridge waveguides is mainly determined by a low-frequency band;
three ridge waveguide of group all are the symmetry form and distribute, form two passageways: one path completes low-frequency filtering, and the other path completes high-frequency filtering, so that the size of the filter is reduced.
A fourth longitudinal ridge waveguide 9 and a fifth longitudinal ridge waveguide 11 which are not in contact with the third group of ridge waveguides are respectively arranged on the two sides of the third group of ridge waveguides, and the centers of the fourth longitudinal ridge waveguide and the fifth longitudinal ridge waveguide are positioned on the symmetry axes of the three groups of ridge waveguides; the fourth longitudinal ridge waveguide 9 is attached to the inner wall of the metal cavity 1, and the fifth longitudinal ridge waveguide 11 is located between the second group of ridge waveguides and the third group of ridge waveguides; the fourth longitudinal ridge waveguide 9 is lower in height than the third set of ridge waveguides; the height of the fifth longitudinal ridge waveguide 11 is the same as that of the metal cavity (1).
The height of the fifth longitudinal ridge waveguide 11 is related to the insertion loss and the fourth longitudinal ridge waveguide 9 is related to the frequency.
The input and output interfaces are completed by SMA interfaces, inner cores of the input interface 13 and the output interface 14 are respectively connected with the two first transverse ridge waveguides 2, and outer cores are connected with the metal cavity 1, so that energy loss is reduced.
The zero control groove 5 is realized by a transverse ridge waveguide with adjustable height.
The second transversal ridge waveguide 10 is used for enhanced coupling; the second longitudinal ridge waveguide 6 is lower than the third transverse ridge waveguide 3 in height and used for enhancing coupling, and the joint is subjected to chamfering treatment; the third longitudinal ridge waveguide 8 is used for reinforcing coupling, and the joint is chamfered.
The joint of the first longitudinal ridge waveguide 7 and the zero control groove 5 is chamfered.
The first transversal ridge waveguide 2 is slot-coupled to the third transversal ridge waveguide 3.
The fourth longitudinal ridge waveguide 9 and the third group of ridge waveguides are coupled through a gap, and the bandwidth performance is effectively improved.
Tuning screws are arranged above one of the first transverse ridge waveguides 2, one of the third transverse ridge waveguides 3 and one of the fourth transverse ridge waveguides 4; the tuning screw adjusts the resonant frequency and the coupling coefficient.
And a tuning screw is arranged above the transverse ridge waveguide for realizing the zero control groove and is used for adjusting the position or the size of the zero control groove, controlling the movement of the zero point and improving the out-of-band rejection performance. Tuning screws are added between the second group of transverse ridge waveguides and the third group of transverse ridge waveguides; and a tuning screw is added between the third group of transverse ridge waveguides and the cavity wall to adjust the resonant frequency and the coupling coefficient.
The fifth longitudinal ridge waveguide 11 is coupled to the third set of ridge waveguides by a gap of a certain wavelength length, thus constituting a first pass band. The third set of ridge waveguides is coupled to the fourth longitudinal ridge waveguide 9 by a slot of a certain wavelength length, thus constituting a second passband.
As shown in FIG. 3, the measured S11 parameter of the filter of the present embodiment can reach about-17 dB in the frequency ranges of 2.515-2.675GHz and 3.6-3.8 GHz. The invention has wider dual-frequency band and better performance.
As shown in fig. 4, the measured S12 parameter of the filter of the present embodiment has an insertion loss of less than 1dB in the frequency band, and has a good out-of-band rejection performance.
As shown in fig. 5, each curve corresponds to the height of a different ridge waveguide, from the bottom to the top in sequence from left to right. With the change of the height, the zero point of the filter moves to the right under the conditions of not changing the resonance frequency and not influencing the performance of the filter, and the filter has the characteristic of controlling the movement of the zero point.
The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above embodiments, and all embodiments are within the scope of the present invention as long as the requirements of the present invention are met.
Claims (9)
1. The zero-controllable miniaturized ridge waveguide 5G dual-frequency band-pass filter is characterized by comprising a metal cavity (1), an input structure (13), an output structure (14), three groups of non-contact ridge waveguides and a transverse ridge waveguide (5), wherein the three groups of non-contact ridge waveguides are arranged in the metal cavity (1);
the first group of ridge waveguides comprises two first transverse ridge waveguides (2) which are arranged in parallel and do not contact with each other, and a second transverse ridge waveguide (10) which is arranged between the two first transverse ridge waveguides (2) and does not contact with the first transverse ridge waveguides (2); one of the first transverse ridge waveguides (2) is connected with a transverse ridge waveguide (5) for zero point control through a first longitudinal ridge waveguide (7); one end of the second transverse ridge waveguide (10) is in contact with the inner wall of the metal cavity (1);
the transverse ridge waveguide (5) for zero point control is connected with the first group of ridge waveguides for controlling high frequency through the first longitudinal ridge waveguide (7) to form a zero point control groove, and zero point movement is realized by controlling the size or position of the transverse ridge waveguide (5);
the second group of ridge waveguides comprises two third transverse ridge waveguides (3) which are arranged in parallel and are not in contact with each other and a second longitudinal ridge waveguide (6) used for connecting the two third transverse ridge waveguides (3);
the third group of ridge waveguides comprises two fourth transverse ridge waveguides (4) which are arranged in parallel and are not in contact with each other and a third longitudinal ridge waveguide (8) used for connecting the two fourth transverse ridge waveguides (4);
a fourth longitudinal ridge waveguide (9) and a fifth longitudinal ridge waveguide (11) which are not in contact with the third group of ridge waveguides are respectively arranged on the two sides of the third group of ridge waveguides, and the centers of the fourth longitudinal ridge waveguide and the fifth longitudinal ridge waveguide are positioned on the symmetry axes of the three groups of ridge waveguides; the fourth longitudinal ridge waveguide (9) is attached to the inner wall of the metal cavity (1), and the fifth longitudinal ridge waveguide (11) is located between the second group of ridge waveguides and the third group of ridge waveguides;
the two first transverse ridge waveguides (2) are respectively connected with an input structure (13) and an output structure (14);
three ridge waveguide of group all are the symmetry form and distribute, form two passageways: one path completes low-frequency filtering, and the other path completes high-frequency filtering, so that the size of the filter is reduced.
2. The zero-controllable miniaturized ridge waveguide 5G dual-band bandpass filter according to claim 1, characterized in that the fifth longitudinal ridge waveguide (11) is coupled to the third set of ridge waveguides by a gap of a certain wavelength length, thereby constituting the first pass band; the third group of ridge waveguides is coupled with a fourth longitudinal ridge waveguide (9) through a gap with a certain wavelength length, so that a second pass band is formed.
3. The zero-controllable miniaturized ridge waveguide 5G dual-band bandpass filter according to claim 1, characterized in that the second transversal ridge waveguide (10) is at the same height as the metal cavity (1).
4. The zero-controllable miniaturized ridge waveguide 5G dual-band bandpass filter according to claim 1, characterized in that the first longitudinal ridge waveguide (7) has the same height as the first set of ridge waveguides, the first and second sets of ridge waveguides having a height determined mainly by the high frequency band and the third set of ridge waveguides having a height determined mainly by the low frequency band.
5. The zero-controllable miniaturized ridge waveguide 5G dual-band bandpass filter according to claim 1, characterized in that the height of the fourth longitudinal ridge waveguide (9) is lower than the third set of ridge waveguides; the height of the fifth longitudinal ridge waveguide (11) is the same as that of the metal cavity (1);
the height of the fifth longitudinal ridge waveguide (11) is related to the insertion loss, and the fourth longitudinal ridge waveguide (9) is related to the frequency.
6. The zero-controllable miniaturized ridge waveguide 5G dual-band bandpass filter according to claim 1, characterized in that the first transversal ridge waveguide (2) is slot-coupled to the third transversal ridge waveguide (3).
7. The miniaturized ridge waveguide 5G dual-band bandpass filter with controllable zero point of claim 1 is characterized in that the fourth longitudinal ridge waveguide (9) and the third group of ridge waveguides are coupled through a gap, and the bandwidth performance is effectively improved.
8. The miniaturized ridge waveguide 5G dual-band bandpass filter with controllable zero point according to claim 1, characterized in that tuning screws are arranged above one of the first transversal ridge waveguide (2), one of the third transversal ridge waveguide (3) and one of the fourth transversal ridge waveguide (4); the tuning screw adjusts the resonant frequency and the coupling coefficient.
9. The miniaturized ridge waveguide 5G dual-band bandpass filter with controllable zero point of claim 1, wherein a tuning screw is added between the second group of transverse ridge waveguides and the third group of transverse ridge waveguides; and a tuning screw is added between the third group of transverse ridge waveguides and the cavity wall to adjust the resonant frequency and the coupling coefficient.
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| CN109713436B (en) * | 2017-10-26 | 2020-10-16 | 华为技术有限公司 | Printed dipole antenna, array antenna and communication equipment |
| CN210668635U (en) * | 2019-12-09 | 2020-06-02 | 成都雷电微力科技有限公司 | Ridge waveguide band-pass filter and filtering structure |
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| US7023302B2 (en) * | 2004-01-14 | 2006-04-04 | Northrop Grumman Corporation | Slow-wave structure for ridge waveguide |
| CN103151585A (en) * | 2013-02-28 | 2013-06-12 | 西安空间无线电技术研究所 | Ridge waveguide filter with high micro discharging threshold value and design method thereof |
| WO2019017085A1 (en) * | 2017-07-20 | 2019-01-24 | 日本電気株式会社 | Tunable bandpass filter and configuration method therefor |
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