CN111883884B - Dual-frequency duplexer based on four-mode dielectric resonator - Google Patents
Dual-frequency duplexer based on four-mode dielectric resonator Download PDFInfo
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- CN111883884B CN111883884B CN202010583006.1A CN202010583006A CN111883884B CN 111883884 B CN111883884 B CN 111883884B CN 202010583006 A CN202010583006 A CN 202010583006A CN 111883884 B CN111883884 B CN 111883884B
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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
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- 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
Abstract
The invention discloses a dual-frequency duplexer based on a four-mode dielectric resonator. The duplexer comprises a four-mode dielectric resonator, a supporting body, a metal cavity, a T-shaped slot line, a metal probe, a port, a positioning screw and a tuning screw. The dual-frequency duplexer based on the four-mode dielectric resonator adopts a structure of a common multimode input-output resonator and a simple input-output coupling feeding mode, greatly reduces the number of resonators, avoids the use of a complex multi-port matching section, and realizes the miniaturization of the device volume and the light weight of the device.
Description
Technical Field
The invention relates to the field of duplexers in radio frequency circuits, in particular to a dual-frequency duplexer based on a four-mode dielectric resonator.
Background
The multi-standard and multi-band development of modern wireless communication systems makes the demand for multi-frequency radio frequency devices increasingly growing. The duplexer is used as a feed circuit of a receiving and transmitting antenna and a signal output and input circuit of a power amplifier and a low-noise amplifier, and the realization of the dual-frequency mode is particularly important for a dual-frequency division duplex system, but the research is few. The existing dual-band duplexer needs eight resonators to complete its basic functions in the second order, and is bulky in volume and mass, which is not favorable for miniaturization and light weight of the communication system (a chinese patent of dual-band duplexer using multi-branch line loading matching network: cn104143672a. chenkuchang; qijiejing; huhao tao; dauzhihong; zhuhong.). In addition, most of the existing dual-band duplexers are implemented by a planar microstrip line structure, and due to the low-Q-value characteristic, the defects of large loss and low isolation are inevitably caused, so that the system performance is further deteriorated.
On the other hand, a plurality of multi-port matching nodes are needed in the traditional duplexer architecture, so that the problem of volume redundancy is also brought while the design is complex. The simple feeding form of the duplexer is sought, and the method has important significance for simplification and integration of the duplexer design.
Disclosure of Invention
In order to overcome at least one defect in the prior art, the invention provides a dual-frequency duplexer based on a four-mode dielectric resonator, which can realize dual-frequency response with low loss and high Q value in two channels of the duplexer. The device adopts a structure of sharing an input four-mode resonator and an output four-mode resonator simultaneously, so that the number of required resonators is greatly reduced, and the miniaturization is facilitated. And the high-Q dielectric resonator is adopted, so that the loss of the device is reduced, and the roll-off rate is improved. The simple coupling feed mode of the linear probe is adopted, the use of a plurality of multiport matching sections is avoided, and the design is simplified. Two pairs of orthogonal concurrent modes are adopted, two-channel double-frequency output is realized, and the channel isolation is improved.
The purpose of the invention is realized by at least one of the following technical solutions.
A dual-band duplexer based on a four-mode dielectric resonator comprises the four-mode dielectric resonator, a support body, a metal cavity, a T-shaped slot line, a metal probe, a port, a positioning screw and a tuning screw;
the four-mode dielectric resonator comprises a first dielectric resonator and a second dielectric resonator; the metal probes comprise a first metal probe, a second metal probe and a third metal probe; the tuning screws comprise a first tuning screw, a second tuning screw, a third tuning screw, a fourth tuning screw and a fifth tuning screw; the support body comprises a first support body and a second support body; the positioning screws comprise first positioning screws and second positioning screws, and the metal cavity comprises a first metal cavity and a second metal cavity; the ports comprise a first port, a second port and a third port;
two T-shaped planes of the T-shaped slot line are respectively attached to the side surfaces of the first metal cavity and the second metal cavity; the horizontal part of the T-shaped slot line faces downwards and is parallel to the bottom surface of the first metal cavity, so that the first metal cavity is defined to be positioned on the left side of the T-shaped slot line, and the second metal cavity is defined to be positioned on the right side of the T-shaped slot line; defining the vertical part of the T-shaped slot line to face upwards and the opposite direction to be downwards; defining the directions of two ends of the horizontal part of the T-shaped slot line as the front and the back;
in the first metal cavity, the first dielectric resonator is connected with the first support body, the first positioning screw is embedded into the first support body, and the first support body is fixed on the inner side of the left side surface of the first metal cavity through the first positioning screw; the first metal probe is transversely arranged above the front slope of the first dielectric resonator; the first tuning screw is positioned right below the first dielectric resonator, the third tuning screw is positioned right behind the first dielectric resonator, and the fifth tuning screw is positioned obliquely below the first dielectric resonator;
in the second metal cavity, the second dielectric resonator is connected with the second support body, a second positioning screw is embedded into the second support body, and the second support body is fixed on the inner side of the right side surface of the second metal cavity through the second positioning screw; the second metal probe is transversely arranged right in front of the second dielectric resonator, and the third metal probe is transversely arranged right above the second dielectric resonator; the second tuning screw is positioned right below the second dielectric resonator, and the fourth tuning screw is positioned right behind the second dielectric resonator;
the first port is connected with the first metal probe and then coupled with the first dielectric resonator to complete signal input, the second port and the third port are respectively connected with the second probe and the third probe and then coupled with the second dielectric resonator to complete signal output of two channels, and the use of a complex multi-port matching joint is avoided.
Further, the first dielectric resonator and the second dielectric resonator are respectively used as a shared input resonator and a shared output resonator, and both have the same four resonance modes, including two resonance modes of up-and-down polarization and two resonance modes of front-and-back polarization.
Furthermore, the first metal probe, the second metal probe and the third metal probe are all linear probes; the first metal probe is used for exciting four resonant modes in the first dielectric resonator, the second metal probe is used for receiving two resonant mode energies of front and back polarization in the second dielectric resonator and reflecting two resonant mode energies of up and down polarization in the second dielectric resonator, and the third metal probe is used for receiving two resonant mode energies of up and down polarization in the second dielectric resonator and reflecting two resonant mode energies of front and back polarization in the second dielectric resonator, so that dual-frequency band-pass response and channel isolation of two channels of the duplexer are achieved.
Further, a T-shaped slot line is arranged between the first dielectric resonator and the second dielectric resonator to complete the inter-resonator coupling of four resonance modes in the first dielectric resonator and the second dielectric resonator, wherein the horizontal part of the T-shaped slot line is used for completing the inter-resonator coupling of two resonance modes of up-and-down polarization, and the vertical part of the T-shaped slot line is used for completing the inter-resonator coupling of two resonance modes of front-and-back polarization.
Furthermore, the lengths of the first tuning screw, the second tuning screw, the third tuning screw and the fourth tuning screw are variable so as to complete frequency tuning and realize various frequency distribution types of the dual-frequency duplexer; the length of the fifth tuning screw is variable to compensate for the asymmetry of the response.
Further, the first port, the second port and the third port are all oriented left and right.
Furthermore, the first dielectric resonator and the second dielectric resonator, the first support body and the second support body, the first metal cavity and the second metal cavity, the first tuning screw and the second tuning screw, the third tuning screw and the fourth tuning screw, and the first positioning screw and the second positioning screw are in left-right mirror symmetry with respect to the T-shaped slot line.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. and meanwhile, the input and output four-mode resonator structure is shared, the number of required resonators is greatly reduced, and the miniaturization advantage is remarkable.
2. The design is carried out based on the high-Q dielectric resonator, so that the loss of the device is effectively reduced, and the selectivity is improved.
3. The simple coupling feed mode of using the linear probe avoids the use of a plurality of multiport matching sections, reduces the volume and simplifies the design.
4. Two pairs of orthogonal concurrent modes are selected for design, two-channel double-frequency output is achieved, and channel isolation is improved.
5. And a plurality of screws with variable lengths are used for frequency tuning, so that various frequency distribution types of the dual-band duplexer can be realized.
Drawings
Fig. 1 is a schematic perspective view of a dual-band duplexer based on a four-mode dielectric resonator according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of a dual-band duplexer based on a four-mode dielectric resonator according to an embodiment of the present invention with dimension labels;
figure 3 is a side view, with dimensions, of a dual band duplexer based on four-mode dielectric resonators in an embodiment of the present invention;
fig. 4 is a front view of a dual band duplexer based on a four-mode dielectric resonator with dimensions labeled according to an embodiment of the present invention;
fig. 5 is a simulated and measured S parameter response curve diagram of the dual-band duplexer based on the four-mode dielectric resonator in the embodiment of the present invention.
Detailed Description
The drawings are for illustration purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
Example (b):
a dual-band duplexer based on a four-mode dielectric resonator is shown in figure 1 and comprises a four-mode dielectric resonator, a support body, a metal cavity, a T-shaped slot line 7, a metal probe, a port, a positioning screw and a tuning screw;
the four-mode dielectric resonator comprises a first dielectric resonator 1 and a second dielectric resonator 2; the metal probes comprise a first metal probe 8, a second metal probe 9 and a third metal probe 10; the tuning screws comprise a first tuning screw 13, a second tuning screw 14, a third tuning screw 15, a fourth tuning screw 16 and a fifth tuning screw 17; the support body comprises a first support body 3 and a second support body 4; the positioning screws comprise a first positioning screw 11 and a second positioning screw 12, and the metal cavity comprises a first metal cavity 5 and a second metal cavity 6; the ports include a first port 18, a second port 19 and a third port 20;
two T-shaped planes of the T-shaped groove line 7 are respectively attached to the side surfaces of the first metal cavity 5 and the second metal cavity 6; the horizontal part of the T-shaped groove line 7 faces downwards and is parallel to the bottom surface of the first metal cavity 5, so that the first metal cavity 5 is defined to be positioned at the left of the T-shaped groove line 7, and the second metal cavity 6 is defined to be positioned at the right of the T-shaped groove line 7; defining the vertical part of the T-shaped groove line 7 to face upward and the opposite direction to be downward; defining the directions of two ends of the horizontal part of the T-shaped groove line 7 to be front and back;
in the first metal cavity 5, the first dielectric resonator 1 is connected with the first support body 3, the first positioning screw 11 is embedded into the first support body 3, and the first support body 3 is fixed on the inner side of the left side surface of the first metal cavity 5 through the first positioning screw 11; the first metal probe 8 is transversely arranged above the first dielectric resonator 1 in a front oblique mode; the first tuning screw 13 is positioned right below the first dielectric resonator 1, the third tuning screw 15 is positioned right behind the first dielectric resonator 1, and the fifth tuning screw 17 is positioned obliquely below the first dielectric resonator 1;
in the second metal cavity 6, the second dielectric resonator 2 is connected with the second supporting body 4, the second positioning screw 12 is embedded into the second supporting body 4, and the second supporting body 4 is fixed on the inner side of the right side surface of the second metal cavity 6 through the second positioning screw 12; the second metal probe 9 is transversely arranged right in front of the second dielectric resonator 2, and the third metal probe 10 is transversely arranged right above the second dielectric resonator 2; the second tuning screw 14 is positioned right below the second dielectric resonator 2, and the fourth tuning screw 16 is positioned right behind the second dielectric resonator 2;
the first port 18 is connected with the first metal probe 8 and then coupled with the first dielectric resonator 1 to complete signal input, the second port 19 and the third port 20 are respectively connected with the second probe 9 and the third probe 10 and then coupled with the second dielectric resonator 2 to complete signal output of two channels, and the use of a complex multi-port matching section is avoided.
The first dielectric resonator 1 and the second dielectric resonator 2 respectively serve as a shared input resonator and a shared output resonator, and both have the same four resonance modes, including two resonance modes of up-and-down polarization and two resonance modes of front-and-back polarization, wherein the two resonance modes of up-and-down polarization can be HEE11 xAnd HEH11 xThe two resonant modes of mode, front and back polarization, may be HEE11 yAnd HEH11 yAnd (5) molding.
The first metal probe 8, the second metal probe 9 and the third metal probe 10 are all linear probes; the first metal probe 8 is used for exciting four resonant modes in the first dielectric resonator 1, the second metal probe 9 is used for receiving two resonant mode energies of front and back polarization in the second dielectric resonator 2 and reflecting two resonant mode energies of up and down polarization in the second dielectric resonator 2, and the third metal probe 10 is used for receiving two resonant mode energies of up and down polarization in the second dielectric resonator 2 and reflecting two resonant mode energies of front and back polarization in the second dielectric resonator 2, so that dual-frequency band-pass response and channel isolation of two channels of the duplexer are achieved.
The T-shaped slot line 7 is located between the first dielectric resonator 1 and the second dielectric resonator 2 to complete the inter-resonator coupling of the four resonance modes in the first dielectric resonator 1 and the second dielectric resonator 2, wherein the horizontal part of the T-shaped slot line 7 is used for completing the inter-resonator coupling of the two resonance modes of the up-and-down polarization, and the vertical part of the T-shaped slot line 7 is used for completing the inter-resonator coupling of the two resonance modes of the front-and-back polarization.
The lengths of the first tuning screw 13, the second tuning screw 14, the third tuning screw 15 and the fourth tuning screw 16 are variable, so that frequency tuning is completed, and various frequency distribution types of the dual-frequency duplexer are realized; the length of the fifth tuning screw 17 is variable to compensate for the asymmetry of the response.
The first port 18, the second port 19 and the third port 20 are all left-right oriented.
The first dielectric resonator 1 and the second dielectric resonator 2, the first support body 3 and the second support body 4, the first metal cavity 5 and the second metal cavity 6, the first tuning screw 13 and the second tuning screw 14, the third tuning screw 15 and the fourth tuning screw 16, and the first positioning screw 11 and the second positioning screw 12 are in left-right mirror symmetry with respect to the T-shaped groove line 7.
In this embodiment, as shown in fig. 2, the first dielectric resonator 1 and the second dielectric resonator 2 have the same outer dimensions and a length L1Is 8mm and has a width L2Is 13mm and has a height L3Is 17 mm; as shown in FIG. 3, the vertical portion length L of the T-shaped groove line 74Is 8.9mm, and has a width W1Is 5.1mm, and the horizontal part length L5Is 17.5mm, and has a width W2Is 3.3mm, and the width L of the first metal cavity 5 and the second metal cavity 66Is 20mm and has a height L723mm, horizontal distance G of the first metal probe 8 from the first dielectric resonator 12Is 2.1mm and is perpendicular to the upper edge of the first metal cavity 5 by a distance G34mm, horizontal distance G of the second metal probe 9 from the second dielectric resonator 242.4mm, vertical distance G of the third metal probe 10 from the second dielectric resonator 251.8mm, depth D of the first tuning screw 13 and the second tuning screw 1411mm, depth D of third and fourth tuning screws 15, 162Is 1mm and the depth of the fifth tuning screw 17 is 2.5 mm; as shown in FIG. 4, the length L of the first metal probe 8820mm, length L of the second metal probe 9919mm, length L of the third metal probe 1010Is 21.5mm, the length L of the first metal cavity 5 and the second metal cavity 61123mm, thickness W of the first slot line of the T-shaped slot lines 73Radius R of the first tuning screw 13, the second tuning screw 14, the third tuning screw 15, the fourth tuning screw 16, the first set screw 11 and the second set screw 12 is 4mm2All 2mm, radius R of fifth tuning screw 1712.5mm, depth D of the first set screw 11 and the second set screw 124Is 3 mm. The first metal cavity 5 and the second metal cavity 6 are made of silver-plated aluminum, the first metal probe 8, the second metal probe 9 and the third metal probe 10 are made of copper, the relative dielectric constant of the first dielectric resonator 1 and the second dielectric resonator 2 is 45, and the dielectric loss tangent tan is 1.89 multiplied by 10-4 First branchThe support 3 and the second support 4 had a relative dielectric constant of 6 and a dielectric loss tangent tan of 2.9X 10-4The circuit volume is 50 multiplied by 20 multiplied by 23mm3。
The results of the simulation and actual measurement of the scattering parameters, i.e., the S-parameter response, are shown in FIG. 5, which contains the simulated S11Measured S11Simulated S21Measured S21Simulated S31Measured S31Simulated S23And measured S23Eight curves. Therefore, the low-frequency channel of the dual-frequency duplexer has dual-frequency response, the dual-frequency bands are respectively positioned at 3.50 GHz and 3.62GHz, and the insertion loss is respectively 0.56 dB and 0.79 dB; meanwhile, the high-frequency channel also has double-frequency response, the double-frequency bands are respectively positioned at 3.57 GHz and 3.67GHz, and the insertion loss is respectively 0.49 dB and 0.35 dB. Besides low loss performance, the isolation is better than 34dB and shows good isolation response according to the measured result. In addition, the two channels generate a plurality of out-of-band zero points, and the selectivity is further improved. It can be seen that the dual band duplexer has good in-band and out-of-band performance and isolation response.
In summary, the present invention provides a dual-band duplexer using four-mode dielectric resonators as common input and output resonators; the device has dual-frequency response in two channels, has the excellent performances of small volume, low insertion loss and high selectivity, and can be widely applied to the radio frequency front end of a dual-frequency or multi-frequency division duplex communication system.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (5)
1. A dual-band duplexer based on a four-mode dielectric resonator is characterized by comprising the four-mode dielectric resonator, a supporting body, a metal cavity, a T-shaped slot line (7), a metal probe, a port, a positioning screw and a tuning screw;
the four-mode dielectric resonator comprises a first dielectric resonator (1) and a second dielectric resonator (2); the metal probes comprise a first metal probe (8), a second metal probe (9) and a third metal probe (10); the tuning screws comprise a first tuning screw (13), a second tuning screw (14), a third tuning screw (15), a fourth tuning screw (16) and a fifth tuning screw (17); the support body comprises a first support body (3) and a second support body (4); the positioning screws comprise first positioning screws (11) and second positioning screws (12), and the metal cavity comprises a first metal cavity (5) and a second metal cavity (6); the ports comprise a first port (18), a second port (19) and a third port (20);
two T-shaped planes of the T-shaped slot line (7) are respectively attached to the side surfaces of the first metal cavity (5) and the second metal cavity (6); the horizontal part of the T-shaped slot line (7) faces downwards and is parallel to the bottom surface of the first metal cavity (5); defining a first metal cavity to be positioned at the left side of the T-shaped groove line, and defining a second metal cavity to be positioned at the right side of the T-shaped groove line; defining the vertical part of the T-shaped slot line to face upwards and the opposite direction to be downwards; defining the directions of two ends of the horizontal part of the T-shaped slot line as the front and the back;
in a first metal cavity (5), a first dielectric resonator (1) is connected with a first supporting body (3), a first positioning screw (11) is embedded into the first supporting body (3), and the first supporting body (3) is fixed on the inner side of the left side surface of the first metal cavity (5) through the first positioning screw (11); the first metal probe (8) is transversely arranged above the front slope of the first dielectric resonator (1); the first tuning screw (13) is positioned right below the first dielectric resonator (1), the third tuning screw (15) is positioned right behind the first dielectric resonator (1), and the fifth tuning screw (17) is positioned obliquely below the back of the first dielectric resonator (1);
in the second metal cavity (6), the second dielectric resonator (2) is connected with the second supporting body (4), a second positioning screw (12) is embedded into the second supporting body (4), and the second supporting body (4) is fixed on the inner side of the right side surface of the second metal cavity (6) through the second positioning screw (12); the second metal probe (9) is transversely arranged right in front of the second dielectric resonator (2), and the third metal probe (10) is transversely arranged right above the second dielectric resonator (2); the second tuning screw (14) is positioned right below the second dielectric resonator (2), and the fourth tuning screw (16) is positioned right behind the second dielectric resonator (2); the transverse arrangement is in a left-to-right direction;
the first port (18) is connected with the first metal probe (8) and then coupled with the first dielectric resonator (1) to complete signal input, the second port (19) and the third port (20) are respectively connected with the second metal probe (9) and the third metal probe (10) and then coupled with the second dielectric resonator (2) to respectively complete signal output of two output channels, and the use of a complex multi-port matching section is avoided; the first metal probe (8), the second metal probe (9) and the third metal probe (10) are all linear probes; the first metal probe (8) is used for exciting four resonance modes in the first dielectric resonator (1), the second metal probe (9) is used for receiving two resonance mode energies of front and back polarization in the second dielectric resonator (2) and reflecting two resonance mode energies of up and down polarization in the second dielectric resonator (2), and the third metal probe (10) is used for receiving two resonance mode energies of up and down polarization in the second dielectric resonator (2) and reflecting two resonance mode energies of front and back polarization in the second dielectric resonator (2), so that the dual-frequency band-pass response of each channel of two output channels of the duplexer and the isolation between the channels are realized;
the first dielectric resonator (1) and the second dielectric resonator (2) are respectively used as a shared input resonator and a shared output resonator, and have the same four resonance modes, including two resonance modes of up-down polarization and two resonance modes of front-back polarization; both channels have dual frequency responses.
2. The dual-band duplexer based on a four-mode dielectric resonator as claimed in claim 1, wherein a T-shaped slot line (7) is located between the first dielectric resonator (1) and the second dielectric resonator (2) to complete the inter-resonator coupling of the four resonant modes in the first dielectric resonator (1) and the second dielectric resonator (2), wherein a horizontal portion of the T-shaped slot line (7) is used to complete the inter-resonator coupling of the two resonant modes of the up-and-down polarization, and a vertical portion of the T-shaped slot line (7) is used to complete the inter-resonator coupling of the two resonant modes of the front-and-back polarization.
3. The dual-band duplexer based on the four-mode dielectric resonator as claimed in claim 1, wherein the lengths of the first tuning screw (13), the second tuning screw (14), the third tuning screw (15) and the fourth tuning screw (16) are variable, so as to implement frequency tuning and realize multiple frequency distribution types of the dual-band duplexer; the length of the fifth tuning screw (17) is variable to compensate for the asymmetry of the response.
4. The dual-band duplexer based on a four-mode dielectric resonator according to claim 1, wherein the first port (18), the second port (19) and the third port (20) are all oriented in the left-right direction.
5. The dual-band duplexer based on a four-mode dielectric resonator according to claim 1, wherein the first dielectric resonator (1) and the second dielectric resonator (2), the first support body (3) and the second support body (4), the first metal cavity (5) and the second metal cavity (6), the first tuning screw (13) and the second tuning screw (14), the third tuning screw (15) and the fourth tuning screw (16), and the first positioning screw (11) and the second positioning screw (12) are in left-right mirror symmetry with respect to the T-shaped slot line (7).
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| CN106654476A (en) * | 2017-01-12 | 2017-05-10 | 华南理工大学 | Novel four-mode dielectric band-pass filter |
| WO2019237616A1 (en) * | 2018-06-11 | 2019-12-19 | 华南理工大学 | Four-mode dielectric resonator-based narrowband filtering rat-race coupler |
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| US8111115B2 (en) * | 2008-07-21 | 2012-02-07 | Com Dev International Ltd. | Method of operation and construction of dual-mode filters, dual band filters, and diplexer/multiplexer devices using half cut dielectric resonators |
| US11081769B2 (en) * | 2015-04-09 | 2021-08-03 | Cts Corporation | RF dielectric waveguide duplexer filter module |
| US10027007B2 (en) * | 2015-06-17 | 2018-07-17 | Cts Corporation | Multi-band RF monoblock filter having first and third filters in a co-linear relationship and first and second filters in a side-by-side relationship |
| CN105070986B (en) * | 2015-07-31 | 2017-10-20 | 华南理工大学 | Medium bimodule band-pass filter based on paster structure |
| CN106099271B (en) * | 2016-08-26 | 2019-05-14 | 华南理工大学 | A kind of HE11Modal balancing formula dielectric filter |
| CN111146539B (en) * | 2019-12-19 | 2021-03-26 | 南京理工大学 | Ceramic dielectric waveguide duplexer |
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| CN106654476A (en) * | 2017-01-12 | 2017-05-10 | 华南理工大学 | Novel four-mode dielectric band-pass filter |
| WO2019237616A1 (en) * | 2018-06-11 | 2019-12-19 | 华南理工大学 | Four-mode dielectric resonator-based narrowband filtering rat-race coupler |
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