CN108649310B - Independent controllable dual-passband filter based on four-mode dielectric resonator - Google Patents

Independent controllable dual-passband filter based on four-mode dielectric resonator Download PDF

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CN108649310B
CN108649310B CN201810421940.6A CN201810421940A CN108649310B CN 108649310 B CN108649310 B CN 108649310B CN 201810421940 A CN201810421940 A CN 201810421940A CN 108649310 B CN108649310 B CN 108649310B
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dielectric resonator
metal
metal cavity
mode dielectric
mode
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CN108649310A (en
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陈建新
袁晓晓
周立衡
张雪锋
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Zhongtian Communication Technology Co.,Ltd.
Zhongtian Broadband Technology Co Ltd
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Nantong University
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/10—Dielectric resonators
    • H01P7/105—Multimode resonators

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  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The invention discloses an independently controllable dual-passband filter based on a four-mode dielectric resonator, which comprises a metal cavity and the four-mode dielectric resonator positioned in the metal cavity, wherein two excitation structures are arranged on the side wall of the metal cavity, and a metal patch is arranged on a bisection plane of the dielectric resonator in the height direction, and the filter has the following beneficial effects: the dual-passband filter designed based on the four-mode dielectric resonator loaded by the metal patch uses the single four-mode resonator, effectively reduces the overall size and the cost, can effectively realize independent control of the frequency and the bandwidth of two passbands by changing the size of the metal patch in the dielectric, simplifies the design steps, and can ensure that the design indexes of the two passbands are easier to realize.

Description

independent controllable dual-passband filter based on four-mode dielectric resonator
Technical Field
The invention relates to the field of communication, in particular to an independent controllable dual-passband filter based on a four-mode dielectric resonator.
Background
With the continuous development of wireless communication technology, more microwave devices with excellent performance are required in the whole communication system. Dual or multi-band filters are continually being investigated and explored as key components in systems. Today, most dual band filter designs are based on stepped impedance resonators, dual mode resonators and stub loaded resonators. However, the unloaded quality factor of these planar microstrip structures is relatively low, resulting in poor insertion loss and frequency selectivity of the filter. To improve these properties, coaxial, waveguide and dielectric resonators are being widely used. However, most dual-band filters are based on a dual-mode resonator design with two parallel coupling paths and are large in size. Moreover, the two passband designs of the existing dual-passband filter are not flexible enough, the bandwidth and the passband frequency cannot be controlled completely and independently, and the diversified wireless communication requirements cannot be met.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide an independently controllable dual-bandpass filter based on four-mode dielectric resonators, aiming at the above-mentioned defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: an independently controllable dual-passband filter based on a four-mode dielectric resonator is constructed, the filter comprises a metal cavity and the four-mode dielectric resonator located in the metal cavity, two excitation structures are arranged on the side wall of the metal cavity, and a metal patch is arranged on a bisection plane of the dielectric resonator in the height direction.
In the independent controllable dual-passband filter based on the four-mode dielectric resonator, the metal patch is a metal silver patch.
In the independent controllable dual-passband filter based on the four-mode dielectric resonator, the dielectric resonator is a cube, and the metal patch is square.
In the independently controllable double-passband filter based on the four-mode dielectric resonator, the diagonal positions of the dielectric resonator are respectively provided with a chamfer.
In the independent controllable dual-passband filter based on the four-mode dielectric resonator, the diagonal positions of the metal patches are provided with a cutting angle respectively.
In the independent controllable dual-passband filter based on the four-mode dielectric resonator, the filter further comprises a base which is fixedly arranged at the bottom of the metal cavity and used for bearing the dielectric resonator.
In the independent controllable dual-passband filter based on the four-mode dielectric resonator, two adjacent side walls of the metal cavity are respectively provided with an excitation structure.
In the independently controllable double-passband filter based on the four-mode dielectric resonator, the excitation structure comprises a joint arranged on the outer side wall of the metal cavity and a feed probe correspondingly connected with the joint, the feed probe comprises a horizontal part perpendicular to the side wall of the metal cavity and a vertical part perpendicular to the horizontal part and located on one side of the dielectric resonator, the front part of the horizontal part is located on the outer side wall of the metal cavity and nested in the joint, and the rear part of the horizontal part penetrates through the side wall of the metal cavity and extends out for a certain distance.
The implementation of the independent controllable dual-passband filter based on the four-mode dielectric resonator has the following beneficial effects: the dual-passband filter designed based on the four-mode dielectric resonator loaded by the metal patch uses a single resonator, effectively reduces the overall size and the cost, can effectively realize independent controllability of the frequency and the bandwidth of two passbands by changing the size of the metal patch in the dielectric, simplifies the design steps, and can make the design indexes of the two passbands easier to realize.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
FIG. 1 is a schematic structural diagram of a four-mode dielectric resonator employed in a dual-bandpass filter of the present invention;
FIG. 2 is an even mode pairand odd module pairA comparative plot of the electric field distribution of (a);
FIG. 3 is a side view of a dielectric resonator when squareWhen the length A is 16mm, the even mode pairAnd odd module pairThe relationship between the frequency of (a) and the side length C of the metal patch is shown schematically;
FIG. 4 is a schematic diagram showing the frequency relationship between the size B of the dielectric corner cut and four modes when the side length C of the metal patch is 12 mm;
FIG. 5 is a graph showing the magnitude b of the corner cut of the metal patch versus the frequency of four modes when the side length A of the square dielectric resonator is 16 mm;
FIG. 6 is a schematic perspective view of a dual bandpass filter of the present invention;
FIG. 7 is a front view of a dual bandpass filter of the invention;
FIG. 8 is a top view of a dual bandpass filter of the invention;
FIG. 9 is a graph showing the relationship between the coupling coefficient and the size B of the dielectric chamfer and the size B of the metal patch chamfer;
FIG. 10 is the external quality factor and the parameter L of the feed probe1And L2A schematic diagram of the relationship of (1);
FIG. 11 is a schematic diagram of simulation and test results.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It is noted that the terms "vertical", "horizontal" and the like are used herein for illustrative purposes only. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The general idea of the invention is as follows: an independently controllable dual-passband filter based on a four-mode dielectric resonator is constructed, the filter comprises a metal cavity and the four-mode dielectric resonator located in the metal cavity, two excitation structures are arranged on the side wall of the metal cavity, and a metal patch is arranged on a bisection plane of the dielectric resonator in the height direction. Make whole resonator possess two pairs of TE through setting up metal paster111And the two excitation structures are arranged to excite the two pairs of degenerate modes to generate two pass bands. The lower pass band uses a pair of even modes (And) The upper passband is formed by a pair of odd modes: (and) And this pair of odd modes is not affected by the metal patch. Therefore, by changing the size of the metal patch, the center frequencies and bandwidths of the two pass bands can be independently controlled.
therefore, the dual-passband filter designed based on the four-mode dielectric resonator loaded by the metal patch uses the single four-mode resonator, effectively reduces the overall size and the cost, can effectively realize independent control of the frequency and the bandwidth of two passbands by changing the size of the metal patch in the dielectric, simplifies the design steps, and can make the design indexes of the two passbands easier to realize.
here, the "single four-mode resonator" may be a single resonator prepared completely independently at a time or may be a single resonator assembled by a certain process. For example, the four-mode dielectric resonator of the invention is actually processed by adhering the upper dielectric and the lower dielectric.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features of the embodiments and examples of the present invention may be combined with each other without conflict.
Before the filter of the present invention is described, the resonators therein are first described. FIG. 1 shows a four-mode dielectric resonator structure for a filter of the present invention, in which the dielectric constant of the dielectric is 38 and the loss angle is 1.5 × 10-4. The dimensions of the outer metal cavity 1 are w × w × h ═ 32 × 32 × 27mm3. A metal patch 3 having a side length of C and a thickness of 0.01mm is mounted on the middle of the dielectric resonator 2 in a cube (a is 16 mm). In this structure, the first four modes are two sets of degenerate modes, which exist at different frequencies, respectively. Wherein at low frequency is a pair of even modes: (And) High frequency is a pair of odd modes (and). As can be seen from fig. 2, the electric fields of the odd and even modes exhibit odd/even symmetry with respect to the middle metal patch, respectively. According to the electromagnetic theory, the metal patch 3 is equivalent to an electric wall and a pair odd modeHas no influence, but can influence even modeas shown in fig. 3. By changing the size of the side length C of the metal patch 3, the frequency of the odd mode is not changed, while the frequency of the even mode increases as the side length increases. The unloaded figures of merit for the two sets of even and odd modes are 2330 and 4670, respectively.
in general, degenerate modes can be used to create a suitable passband bandwidth by introducing perturbations to separate the frequencies of the two modes. In the present invention, varying the size of the cut angle B of the medium can simultaneously vary the frequency of each of the two sets of degenerate modes, as shown in FIG. 4. But changing the size b of the cutting angle of the metal patch, two even modes: (and) Will slowly separate for the two odd modes: (And) There is no effect, as shown in fig. 5.
based on the above analysis, the present invention constructs a dual-passband filter, as shown in fig. 6 to 8, the dual-passband filter of the present invention includes a metal cavity 1 and a four-mode dielectric resonator 2 located in the metal cavity 1, and a metal patch 3 is disposed on a bisector of the dielectric resonator 2 in the height direction.
In this embodiment, the metal patch 3 may be, but is not limited to, a metal silver patch. The dielectric resonator 2 is a cube, a base 4 is arranged below the dielectric resonator 2, and the base 4 can be a teflon base. The metal patch 3 is square, the metal patch 3 is positioned at the center of the dielectric resonator 2, and the dielectric resonator 2 is positioned at the center of the metal cavity 1. The dielectric resonator 2 has a corner cut C21 and C22 at diagonal positions, respectively. The metal patch 3 has a cut angle C31 and a cut angle C32 at diagonal positions, respectively. The cut angles C21 and C22, and the cut angles C31 and C32 are located on the same straight line.
Two adjacent side walls of the metal cavity 1 are respectively provided with an excitation structure, as shown in the figures P1 and P2. The excitation structure comprises a joint arranged on the outer side wall of the metal cavity and a feed probe 5 correspondingly connected with the joint, the feed probe 5 comprises a horizontal part perpendicular to the side wall of the metal cavity 1 and a vertical part perpendicularly connected with the horizontal part and positioned on one side of the dielectric resonator 2, the front part of the horizontal part is positioned on the outer side wall of the metal cavity 1 and nested in the joint, the rear part of the horizontal part penetrates through the side wall of the metal cavity 1 and extends for a certain distance, and as shown in fig. 7, the length of the rear part is L1The vertical part has a length L2。
The whole design process of the invention is based on extracting the coupling coefficients and the external quality factors of the two passbands to meet the design requirements. From the above resonator analysis, a pair of even modes operating in the lower passband can be derivedAnd a pair of odd modes operating in the upper passbandIndependent controllability over frequency and bandwidth can be achieved as shown in fig. 3 and 9, respectively. As is apparent from FIG. 9, the coupling coefficient (k) of the lower passband1) The coupling coefficient (k) of the upper passband can be simultaneously controlled by the size B of the dielectric chamfer and the size B of the metal patch chamfer2) Affected only by B. As is evident from fig. 10, the coupling strength between the dielectric resonator 2 and the meander feed probe 5 is mainly determined by the two parts (L) of the feed probe1and L2) And (6) determining. The outer quality factor of the upper passband is defined by L1And L2Simultaneous control, with the outer quality factor of the lower passband being limited only by L1control and L2is independent of the length of the same. Therefore, the coupling coefficients and the external quality factors of the two pass bands can be independently controlled, so that the double-pass-band filter can be better designed.
Based on a dual-passband filter prototype, both passbands are tangent ratiosThe snowflake frequency response. The center frequency of the lower pass band is 2.18GHz, and the 0.04dB ripple relative bandwidth is 0.8%. The center frequency of the upper passband is 2.68GHz, and the 0.04dB ripple relative bandwidth is 0.6%. The lumped element values for the low pass prototype filter for the lower passband are, by design: g0L＝1，g1L＝0.7578，g2L＝0.5888，g3L1.2872. The lumped element values for the upper passband are: g0H＝1，g1H＝0.9978，g2H＝0.6662，g3H1.4978. Therefore, the coupling coefficient k required for the upper passband1Is 0.0142 and an external quality factor Qe1It was 79.86. Coupling coefficient k required for lower passband2Is 0.0093 and external quality factor Qe2Is 131.89. The size of the designed dual-band filter is as follows: l is1＝6.2mm,L214.3mm, w 32mm, h 27mm, a 16mm, B3.2 mm, B0.5 mm, C12 mm and t 4 mm. Fig. 11 is a diagram of simulation and test results, wherein the center frequency: the lower passband is 2.18GHz, and the upper passband is 2.68 GHz; 3dB bandwidth (%): the lower passband is 1.6, and the upper passband is 1.4; insertion loss: the lower passband is-0.7 dB, and the upper passband is-0.7 dB; five transmission zeros: 2.21GHz, 2.25GHz, 2.61GHz, 2.73GHz and 2.86 GHz.
while the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (7)

1. The independent controllable dual-passband filter based on the four-mode dielectric resonator is characterized by comprising a metal cavity and the four-mode dielectric resonator, wherein the four-mode dielectric resonator is positioned in the metal cavity, two excitation structures are arranged on the side wall of the metal cavity, a metal patch is arranged on a bisection plane in the height direction of the dielectric resonator, and the metal patch is a metal silver patch.
2. The independently controllable dual bandpass filter according to claim 1, wherein the dielectric resonators are square and the metal patches are square.
3. An independently controllable dual band-pass filter based on four-mode dielectric resonators as claimed in any of claims 1-2, characterized in that said dielectric resonators have a corner cut at each of their diagonal positions.
4. An independently controllable dual band-pass filter based on four-mode dielectric resonators according to any of claims 1-2, characterized in that the diagonal positions of said metal patches have a cut angle respectively.
5. An independently controllable dual band-pass filter based on four-mode dielectric resonators according to claim 1, characterized in that said filter further comprises a base fixedly arranged at the bottom of said metal cavity for carrying said dielectric resonators.
6. An independently controllable dual band-pass filter based on four-mode dielectric resonators as claimed in claim 1, wherein two adjacent sidewalls of said metal cavity are provided with one said excitation structure, respectively.
7. The independently controllable double-passband filter based on four-mode dielectric resonator according to claim 6, wherein the excitation structure comprises a connector arranged on the outer sidewall of the metal cavity and a feeding probe correspondingly connected with the connector, the feeding probe comprises a horizontal part perpendicular to the sidewall of the metal cavity and a vertical part perpendicular to the horizontal part and located on one side of the dielectric resonator, the front part of the horizontal part is located on the outer sidewall of the metal cavity and nested in the connector, and the rear part of the horizontal part passes through the sidewall of the metal cavity and extends out a certain distance.
CN201810421940.6A 2018-04-24 2018-05-04 Independent controllable dual-passband filter based on four-mode dielectric resonator Active CN108649310B (en)

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CN109888442B (en) * 2019-01-16 2021-02-02 佛山市顺德区中山大学研究院 Four-mode dielectric band-pass filter
CN109742493B (en) * 2019-01-21 2020-07-24 淮阴工学院 Differential dual-passband filter based on four-mode dielectric resonator
CN113036333B (en) * 2021-03-27 2022-03-22 南通大学 Dual-mode dual-passband dielectric filter power divider capable of generating out-of-band zero
CN113488763B (en) * 2021-07-08 2023-08-22 南通大学 Dual-band dielectric strip filtering antenna

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1179019A (en) * 1996-08-29 1998-04-15 株式会社村田制作所 Transverse magnetic mode medium resonator and transverse magnetic mode medium filter using it and diplexer
CN102637928A (en) * 2012-04-13 2012-08-15 深圳光启创新技术有限公司 Dielectric filter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1179019A (en) * 1996-08-29 1998-04-15 株式会社村田制作所 Transverse magnetic mode medium resonator and transverse magnetic mode medium filter using it and diplexer
CN102637928A (en) * 2012-04-13 2012-08-15 深圳光启创新技术有限公司 Dielectric filter

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