CN111509338A - Dielectric duplexer and small duplexer based on stepped impedance transformation tap - Google Patents
Dielectric duplexer and small duplexer based on stepped impedance transformation tap Download PDFInfo
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- CN111509338A CN111509338A CN202010494833.3A CN202010494833A CN111509338A CN 111509338 A CN111509338 A CN 111509338A CN 202010494833 A CN202010494833 A CN 202010494833A CN 111509338 A CN111509338 A CN 111509338A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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Abstract
The application discloses a medium duplexer and a small duplexer based on a step impedance transformation tap, wherein the medium duplexer comprises a medium plate, the medium plate is provided with two filtering channels and a public channel coupled with the filtering channels, the filtering channels are sequentially provided with a plurality of medium resonators along the axis direction, and the adjacent medium resonators are coupled; the common channel is provided with an input connector, a stepped impedance conversion tap which is respectively coupled with one of the dielectric resonators in the two filtering channels is arranged in the input connector, and the filtering channels are provided with output connectors which are coupled with the corresponding dielectric resonators; the step impedance transformation tap comprises two transmission lines with one ends connected, and the coupling feed strength between the two filtering channels is limited by the length or the width of the two transmission lines. The technical problem of mutual coupling elimination between two filtering channels of the dielectric duplexer is solved through the technical scheme.
Description
Technical Field
The invention relates to the technical field of communication equipment components, in particular to a radio frequency microwave dielectric duplexer, and specifically relates to a dielectric duplexer based on a stepped impedance transformation tap and a small duplexer.
Background
The microwave duplexer is one of basic elements in systems such as mobile communication, radar, satellite, naval vessel and the like, and mainly realizes important functions such as noise filtering, combining and frequency selecting. In recent years, with the rapid development of mobile communications, the resources of the wireless spectrum are increasingly limited. The new communication form puts forward the rigorous requirements of integration, high performance, batch production and low cost on the radio frequency microwave duplexer. The traditional metal coaxial air cavity duplexer can not meet the requirement of a large-scale MIMO system, the dielectric resonator can greatly reduce the size of the duplexer due to the fact that the dielectric constant of the internal material is high, and meanwhile, the dielectric duplexer can realize low-cost and high-yield large-scale production by matching with good firing, electroplating processes and debugging means. In the background of such application requirements and communication development, the dielectric duplexer has also become a popular subject of scientific research.
The dielectric duplexer has great requirements in a 5G FDD system, although each channel of the dielectric duplexer is a single filter, the design of the dielectric duplexer not only needs to meet the indexes of in-band loss and standing wave, but also often needs to have steep out-of-band characteristics and flat in-band group delay characteristics, so that the complexity of the series and topological structure of the duplexer is increased, and a lot of difficulties are increased for simulation optimization and later debugging. The dielectric duplexer faces more difficult challenges than a single filter in production and manufacture, and no mature theory exists in this respect at home and abroad, so how to solve the problem of the dielectric duplexer in eliminating mutual coupling has a special guiding significance for large-scale intelligent manufacture of the dielectric duplexer.
Disclosure of Invention
The application provides a medium duplexer and small-size duplexer based on ladder impedance transform is taken a percentage, can inject the coupling feed intensity between two filtering channels through the width or the length that changes two sections transmission lines in the ladder impedance transform is taken a percentage for solve the technical problem that mutual coupling is eliminated between two filtering channels of medium duplexer.
In view of this, a first aspect of the present application provides a dielectric duplexer based on a step impedance transformation tap, including a dielectric slab, where the dielectric slab is provided with two filtering channels and a common channel coupled to the filtering channels, the filtering channels are sequentially provided with a plurality of dielectric resonators along an axis direction, and adjacent dielectric resonators are coupled to each other;
the common channel is provided with an input connector, a stepped impedance conversion tap which is respectively coupled with one of the dielectric resonators in the two filtering channels is arranged in the input connector, and the filtering channels are provided with output connectors which are coupled with the corresponding dielectric resonators;
the step impedance transformation tap comprises two transmission lines with one ends connected, and the coupling feed strength between the two filtering channels is limited by the length or the width of the two transmission lines.
Preferably, a separation wall for reducing the coupling strength between the two filtering channels is arranged between the two filtering channels.
Preferably, the dielectric plate is provided with a blind hole for defining a resonance frequency of the dielectric resonator.
Preferably, adjacent dielectric resonators are coupled by arranging a coupling window or a coupling debugging hole, and the coupling window or the coupling debugging hole is used for limiting the coupling strength between the adjacent dielectric resonators.
Preferably, a debugging hole is arranged between the stepped impedance transformation tap and the dielectric resonator closest to the stepped impedance transformation tap, and the debugging hole is used for limiting the external coupling strength of the filter channel.
Preferably, the dielectric plate is a dielectric with any dielectric constant, and the outer surface of the dielectric plate is provided with a metal coating.
Preferably, the input connector is provided with an inner conductor and an outer conductor sleeved on the outer layer of the inner conductor, and the inner conductor is connected with one section of the transmission line.
On the other hand, the invention also provides a small duplexer, which applies the step impedance transformation tap and comprises an upper dielectric plate and a lower dielectric plate which are mutually laminated, wherein the upper dielectric plate is provided with a first filtering channel A, a second filtering channel A and a common channel which is respectively coupled and connected with the first filtering channel A and the second filtering channel A, and the lower dielectric plate is also provided with a first filtering channel B which is arranged opposite to the first filtering channel A and a second filtering channel B which is arranged opposite to the second filtering channel A;
the first filtering channel A, the first filtering channel B, the second filtering channel A and the second filtering channel B are all sequentially provided with a plurality of dielectric filters along the axis direction, the dielectric filters between the first filtering channel A and the first filtering channel B are correspondingly arranged up and down, the dielectric filters between the second filtering channel A and the second filtering channel B are correspondingly arranged up and down, the adjacent dielectric filters are in coupling connection, and the dielectric filters which correspond up and down are in coupling connection;
the first filtering channel A and the second filtering channel A are both provided with output connectors coupled with the corresponding dielectric resonators, the common channel is provided with an input connector, the input connector is internally provided with the stepped impedance transformation tap, and the stepped impedance transformation tap is respectively coupled with one of the dielectric resonators in the first filtering channel A and the second filtering channel A.
Preferably, a separation wall for reducing the coupling strength between the first filtering channel a and the second filtering channel a is arranged between the first filtering channel a and the second filtering channel a.
Preferably, the upper dielectric plate and the lower dielectric plate are provided with dual-hole magnetic coupling debugging holes for limiting the coupling strength between the adjacent dielectric resonators;
the upper dielectric plate and the lower dielectric plate are provided with corresponding annular gap electric coupling structures, and the annular gap electric coupling structures are used for the negative coupling connection of the dielectric resonators which are correspondingly arranged up and down;
the upper dielectric plate and the lower dielectric plate are provided with corresponding strip-shaped gap magnetic coupling structures, and the strip-shaped gap magnetic coupling structures are used for positive coupling connection of the dielectric resonators which are arranged in an up-down corresponding mode.
According to the technical scheme, the embodiment of the application has the following advantages:
the embodiment of the invention provides a dielectric duplexer based on a step impedance transformation tap, which comprises a dielectric plate, wherein the dielectric plate is provided with two filtering channels and a common channel coupled with the filtering channels, the filtering channels are sequentially provided with a plurality of dielectric resonators along the axial direction, and the adjacent dielectric resonators are coupled; the common channel is provided with an input connector, a stepped impedance conversion tap which is respectively coupled with one of the dielectric resonators in the two filtering channels is arranged in the input connector, and the filtering channels are provided with output connectors which are coupled with the corresponding dielectric resonators; the step impedance transformation tap comprises two transmission lines with one ends connected, and the coupling feed strength between the two filtering channels is limited by the length or the width of the two transmission lines. In the embodiment, the stepped impedance transformation tap is arranged and is formed by connecting two sections of transmission lines, and based on the stepped impedance tap feed theory, the external quality factors of two filter channels of the dielectric duplexer can be determined by the respective length and width of the two sections of transmission lines, so that the feed coupling strength between the two filter channels is changed, the decoupling of the dielectric duplexer is completed, the two filter channels form independent parts, and the degree of freedom is extremely high.
The small-sized duplexer provided by another embodiment of the invention has extremely high degree of freedom by applying the stepped impedance transformation tap. Meanwhile, the double-layer filtering channel is designed, and the stacked topological structure is adopted, so that the double-layer filtering channel has the characteristics of miniaturization and low cost.
Drawings
Fig. 1 is a schematic top view of a dielectric duplexer based on a stepped impedance transformation tap according to first to second embodiments of the present application;
fig. 2 is a schematic bottom view of a dielectric duplexer based on a step impedance transformation tap according to first to second embodiments of the present application;
fig. 3 is a schematic structural diagram of a stepped impedance transformation tap in a dielectric duplexer based on the stepped impedance transformation tap according to an embodiment of the present application;
FIG. 4 is a cross-sectional view taken along A-A of FIG. 3;
fig. 5 is an equivalent circuit diagram of a dielectric duplexer based on a step impedance transformation tap according to an embodiment of the present invention;
fig. 6 is a diagram illustrating a simulation result of group delay of a dielectric duplexer based on a stepped impedance tap according to an embodiment of the present invention;
fig. 7 is a frequency response diagram of a dielectric duplexer based on a step impedance transformation tap according to an embodiment of the present invention;
fig. 8 is a schematic top view of a dielectric duplexer based on a stepped impedance tap according to a third embodiment of the present invention;
fig. 9 is a schematic bottom view of a dielectric duplexer based on a step impedance transformation tap according to a third embodiment of the present invention;
fig. 10 is a schematic top view illustrating a small duplexer according to a fourth embodiment of the present invention;
fig. 11 is a schematic bottom view of a layered structure of a small duplexer according to a fourth embodiment of the present invention;
fig. 12 is a schematic diagram of a top-view layered structure of a small duplexer according to a fourth embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
For convenience of understanding, please refer to fig. 1-2, an embodiment of the present invention provides a dielectric duplexer based on a step impedance transformation tap, including a dielectric slab 1, where the dielectric slab 1 is provided with two filtering channels and a common channel coupled to the filtering channels, the filtering channels are sequentially provided with a plurality of dielectric resonators along an axial direction, and adjacent dielectric resonators are coupled to each other;
furthermore, the common channel is provided with an input joint 4, and a stepped impedance transformation tap 5 which is respectively coupled with one dielectric resonator in the two filter channels is arranged in the input joint 4;
furthermore, each filter channel is provided with an output connector coupled with the corresponding dielectric resonator;
it will be appreciated that external energy may be transmitted into the duplexer via the input terminal 4 and the ladder impedance transformation tap 5 of the common channel, transmitted through the dielectric resonator coupled to the ladder impedance transformation tap 5 of the common channel, and finally transmitted out via the output terminals 60, 61 provided in the two filter channels.
Further, referring to fig. 3-4, the stepped impedance transformation tap 5 comprises two transmission lines connected at one end, and the coupling feed strength between the two filter channels is defined by the length or width of the transmission lines.
It should be noted that the working principle of this embodiment is as follows:
center frequency f of each filtering channel of dielectric duplexermImpedance (R) to common channel (source terminal)in)mAnd an external quality factor QemThe relationship of (a) to (b) is as follows:
wherein B ismOf dielectric resonators 11, 12, 13, 14And (3) inputting susceptance, wherein m is the sequence of filtering channels of the dielectric duplexer, and m is 1 and 2.
For easy understanding, please refer to fig. 5, fig. 5 is an equivalent schematic diagram of the step impedance transformation tap 5, wherein the transmission line Z1And a transmission line Z2Equivalent to the dielectric resonators 12, 13, Z closest to the common channel in the two filter channels in the dielectric duplexer1inAnd Z2inTwo-section transmission line Z equivalent to step impedance conversion tap 5 respectively1、Z2The impedance varies according to the width of the stepped impedance transformation tap 5, the larger the width, the lower the impedance, and vice versa, and l in the figure1inAnd l2inTwo-section transmission line Z equivalent to step impedance conversion tap 5 respectively1、Z2The length of (A) is shown in the figure, Z1in、Z2in、l1inAnd l2inThe introduction of four physical quantities can adjust the impedance of the two filter channels of the dielectric duplexer to the common channel (source end), and the principle is that the impedance (R) of the duplexer to the common channel (source end) isin)mOr with Z1in、Z2in、l1inAnd l2inCalculated, e.g. at the centre frequency f of the first filtered channel1The following can be obtained:
wherein, t1＝tan(βl1in)，t2＝tan(βl2in)，Z0Is the port impedance, wherein the phase constant β of the high and low impedance transmission lines is equal, and similarly, at the second filtered channel frequency point f of the dielectric duplexer2The same formula as in the publication (2) can be obtained.
In combination with formula (1), the (R) can be determined at two working frequency points of the dielectric duplexerin)1And (R)in)2Corresponding to Z1in,Z2in,l1inAnd l2in. Similarly, by Z of tap in equation (2)1in、Z2in、l1inAnd l2inCalculated (R)in)1And (R)in)2Applied to the formula (1), the external quality factor Q can be obtainedemSo that Z of the tap 5 can be changed by setting the stepped impedance1in、Z2in、l1inAnd l2inThe external quality factor is satisfied, and the higher the external quality factor is, the lower the coupling feed strength is.
For convenience of understanding, referring to fig. 6, fig. 6 is a simulation result of group delay of the stepped impedance transformation tap 5 in the present embodiment, where the abscissa is frequency and the ordinate is group delay, it can be seen that the impedance and the length of the stepped impedance transformation tap 5 can be set to better satisfy the peak requirement of two group delays, and the external quality factor of the filtering channel can use the peak value τ of the reflection group delaymaxCalculated by the following formula (3):
wherein Q isemIs an external figure of merit;
therefore, the external quality factor Q in this embodiment can be calculated by combining the group delay peak value in fig. 3 with the formula (3) and visually recognizing and calculating the external quality factor from the group delay peak valuee1＝19.2275，Qe219.3038, so that the Z of tap 5 is transformed by the step impedance1in、Z2in、l1inAnd l2inThe four physical quantities can satisfy the external quality factors Q of two filtering channels of the dielectric duplexeremAnd (where m is 1,2), thereby eliminating mutual coupling between the two filter channels of the dielectric duplexer.
Further, when the two transmission lines Z of the tap 5 are stepped impedance-transformed1、Z2Can only transmit the transmission line Z under the condition of the same length1、Z2The width of the frame is adjusted, so that the degree of freedom is reduced to two, and the structure is simplified.
Further, two transmission lines Z of the stepped impedance conversion tap 51、Z2The cross-sectional shape of (A) may be rectangularThe shape, square, double rectangle, trapezoid, circle, ellipse or irregular shape, which is not limited herein.
Example two
The second embodiment is different from the first embodiment in technical features that one filter channel is provided with a first dielectric resonator 12 and a second dielectric resonator 11; the other filter channel is provided with a third dielectric resonator 13 and a fourth dielectric resonator 14;
further, for the first dielectric resonator 12 and the third dielectric resonator 13, relative to other dielectric resonators in the same filter channel, the first dielectric resonator 12 and the third dielectric resonator 13 are closest to the stepped impedance transformation tap 5, the stepped impedance transformation tap 5 is coupled with the first dielectric resonator 12 and the third dielectric resonator 13, and meanwhile, the debugging holes 30 and 31 are arranged between the stepped impedance transformation tap 5 and the first dielectric resonator 12 and the third dielectric resonator 13 respectively, and are used for limiting the external coupling strength of the filter channel.
Further, the output connector is coupled with the dielectric resonator which is closest to the output connector.
Furthermore, a separation wall 3 for reducing the coupling strength between the two filter channels is arranged between the two filter channels.
It should be noted that, by changing the length of the partition wall 3, the coupling strength between the two filter channels can be defined, and the longer the length of the partition wall, the stronger the coupling strength between the two filter channels.
Further, the dielectric plate 1 is provided with four blind holes 111, 112, 113, 114 for defining the resonance frequencies of the first to fourth resonators 11, 12, 13, 14, respectively.
Further, adjacent dielectric resonators are coupled by providing coupling windows or coupling adjustment holes 20, 21, and the coupling windows or coupling adjustment holes 20, 21 are used for defining the coupling strength between the adjacent dielectric resonators.
It should be noted that, for easy understanding, referring to fig. 7, fig. 7 is a frequency response diagram of the dielectric duplexer, where the abscissa is frequency and the ordinate is decibel, and it can be seen from the diagram that the return loss of both filter channels in the passband is better than 20dB, the insertion loss is better than 0.2dB, and the isolation is better.
Further, the dielectric plate 1 is a dielectric with any dielectric constant, and the outer surface of the dielectric plate 1 is provided with a metal coating, in this embodiment, the outer surface of the dielectric plate may be plated with silver.
Further, the dielectric sheet 1 may be rectangular, circular, double rectangular, multi-rectangular, trapezoidal, or polygonal.
Further, referring to fig. 4, the input terminal 4 is provided with an inner conductor 40 and an outer conductor 41 sleeved on the outer layer of the inner conductor 40, wherein the inner conductor 40 is connected with one section of the transmission line.
EXAMPLE III
Third embodiment is based on the first embodiment, with reference to fig. 8 to 9, and further, the third embodiment provides an advanced digital dielectric resonator based on a step impedance transformation tap, including a dielectric slab 1, where the dielectric slab 1 is provided with a first filtering channel, a second filtering channel, and a common channel coupled to the first filtering channel and the second filtering channel respectively;
furthermore, the first filtering channel is provided with seven dielectric resonators 151, 152, 153, 161, 162, 163 and 164, the first filtering channel is provided with two rows of channels side by side, wherein one row of channels is provided with four dielectric resonators 161, 162, 163 and 164 in sequence along the axial direction, the other row of channels is provided with three dielectric resonators 151, 152 and 153 in sequence along the axial direction, the dielectric resonators between the two rows of channels are correspondingly arranged, and the adjacent dielectric resonators are in coupling connection.
Furthermore, the second filter channel is provided with eight dielectric resonators 154, 155, 156 and fifteenth dielectric resonators 157, 165, 166, 167, 168, the second filter channel is provided with two rows of channels side by side, wherein one row of channels is provided with four dielectric resonators 154, 155, 156, 157 along the axial direction, the other row of channels is provided with four dielectric resonators 165, 166, 167, 168 along the axial direction, the dielectric resonators between the two rows of channels are correspondingly arranged, and the adjacent dielectric resonators are coupled and connected.
Further, the common channel is provided with an input connector 4, and a stepped impedance transformation tap 5 is arranged in the input connector 4, wherein the stepped impedance transformation tap 5 in the first embodiment is applied to the stepped impedance transformation tap 5.
Compared with other dielectric resonators in the same filter channel, the dielectric resonators 164 and 165 are closest to the stepped impedance transformation tap 5, and the stepped impedance transformation tap 5 is respectively coupled with the dielectric resonators 164 and 165;
furthermore, the first filter channel and the second filter channel are respectively provided with output connectors 60 and 61, and the output connectors 60 and 61 are coupled with the dielectric resonators 161 and 168 closest to the output connectors;
further, tuning holes 128, 129 may be provided between the stepped impedance transformation tap 5 and the dielectric resonators 164, 165, respectively, for adjusting the coupling strength.
Further, the first filtering channel is provided with seven blind holes 121, 122, 123, 131, 132, 133, 134;
further, coupling adjusting holes 22, 23, 24, 25 or coupling windows 31, 32, 33, 34, 35 are arranged between adjacent dielectric resonators;
further, the second filtering channel is provided with eight blind holes 124, 125, 126, 127, 135, 136, 137, 138;
furthermore, a separation wall 3 is arranged between the first filtering channel and the second filtering channel.
In the third embodiment, since the dielectric resonator with a high number of stages is adopted, the dielectric duplexer can meet the requirements of high isolation and out-of-band selectivity, and meanwhile, since the planar topology structure is adopted, the dielectric duplexer has the advantages of low cost, easiness in processing and high yield.
Example four
An embodiment fourth provides a small duplexer, referring to fig. 10 to 12, where the step impedance transformation tap 5 in the foregoing embodiment is applied, and includes an upper dielectric plate 70 and a lower dielectric plate 7 that are stacked mutually, where the upper dielectric plate 70 is provided with a first filtering channel a, a second filtering channel a, and a common channel coupled to the first filtering channel a and the second filtering channel a, respectively, and the lower dielectric plate 7 is further provided with a first filtering channel B arranged opposite to the first filtering channel a, and a second filtering channel B arranged opposite to the second filtering channel a;
the first filtering channel A, the first filtering channel B, the second filtering channel A and the second filtering channel B are sequentially provided with a plurality of dielectric filters along the axis direction, the dielectric filters between the first filtering channel A and the first filtering channel B are arranged up and down correspondingly, the dielectric filters between the second filtering channel A and the second filtering channel B are arranged up and down correspondingly, adjacent dielectric filters are in coupling connection, and the dielectric filters corresponding to the upper and lower parts are in coupling connection;
the first filtering channel a and the first filtering channel B are synthesized into a low-frequency filtering channel, and the first filtering channel a and the first filtering channel B are provided with seven dielectric resonators 151, 152, 153, 154, 155, 156 and 157; the second filter channel a and the second filter channel B are combined into a high-frequency filter channel, and eight dielectric resonators 161, 162, 163, 164, 165, 166, 167, 168 are provided in the second filter channel a and the second filter channel B.
The first filter channel A and the second filter channel A are respectively provided with output connectors 60 and 61, the output connectors 60 and 61 are coupled with the dielectric resonators 151 and 162 which are closest to the output connectors 60 and 61, the common channel is provided with an input connector 4, a stepped impedance transformation tap 5 is arranged in the input connector 4, and the stepped impedance transformation tap 5 is coupled with the dielectric resonator 156 which is closest to the stepped impedance transformation tap 5 in the first filter channel A and is coupled with the dielectric resonator 167 which is closest to the stepped impedance transformation tap 5 in the second filter channel A.
Furthermore, a separation wall 3 for reducing the coupling strength between the first filtering channel a and the second filtering channel a is arranged between the first filtering channel a and the second filtering channel a.
Further, the upper dielectric plate 70 and the lower dielectric plate 7 are each provided with a two-hole magnetic coupling tuning hole 20, 21, 22, 210, 211, 212, 213, 214, 215 for defining the coupling strength between the adjacent dielectric resonators;
in this embodiment, the two-hole magnetic coupling tuning holes 20, 21, 22, 210, 211, 212, 213, 214, and 215 are nine groups.
The upper dielectric plate 70 and the lower dielectric plate 7 are provided with corresponding annular gap electric coupling structures 81, 82, 83, 84, 85 and 86, and the annular gap electric coupling structures 81, 82, 83, 84, 85 and 86 are used for negative coupling connection between dielectric resonators which are correspondingly arranged up and down;
it should be noted that, in the present embodiment, the annular slot electrical coupling structures 81, 82, 83, 84, 85, and 86 are three groups.
The upper dielectric plate 70 and the lower dielectric plate 7 are provided with corresponding strip-shaped slot magnetic coupling structures 91, 92, 93, 94, 95, 96, 97 and 98, and the strip-shaped slot magnetic coupling structures 91, 92, 93, 94, 95, 96, 97 and 98 are used for positive coupling connection between dielectric resonators which are correspondingly arranged up and down.
In this embodiment, the strip-shaped slot magnetic coupling structures 91, 92, 93, 94, 95, 96, 97, and 98 are four groups.
It can be understood that negative coupling and positive coupling between the dielectric resonators are respectively realized through the annular slot electric coupling structures 81, 82, 83, 84, 85, 86 and the strip-shaped slot magnetic coupling structures 91, 92, 93, 94, 95, 96, 97, 98, and the positive and negative couplings are used in combination, so that transmission zero points can be realized, out-of-band selectivity can be improved, and the performance of the dielectric duplexer can be improved. In contrast, in the present embodiment 3, by adopting the stacked topology, the dielectric duplexer has the advantages of miniaturization, low cost, and easy processing.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. The utility model provides a medium duplexer based on ladder impedance transformation is taken a percentage, includes the dielectric plate, the dielectric plate be equipped with two filtering channel and with filtering channel coupling connection's common channel, its characterized in that:
the filtering channel is sequentially provided with a plurality of dielectric resonators along the axis direction, and adjacent dielectric resonators are coupled and connected;
the common channel is provided with an input connector, a stepped impedance conversion tap which is respectively coupled with one of the dielectric resonators in the two filtering channels is arranged in the input connector, and the filtering channels are provided with output connectors which are coupled with the corresponding dielectric resonators;
the step impedance transformation tap comprises two transmission lines with one ends connected, and the coupling feed strength between the two filtering channels is limited by the length or the width of the two transmission lines.
2. The ladder impedance transformation tap-based dielectric duplexer of claim 1, wherein a separation wall for reducing the coupling strength between the two filter channels is arranged between the two filter channels.
3. The ladder impedance transformation tap-based dielectric duplexer of claim 1, wherein the dielectric plate is provided with blind holes for defining a resonance frequency of the dielectric resonator.
4. The ladder impedance transformation tap-based dielectric duplexer of claim 1, wherein adjacent dielectric resonators are coupled by providing a coupling window or a coupling debugging hole, and the coupling window or the coupling debugging hole is used for defining the coupling strength between the adjacent dielectric resonators.
5. The ladder impedance transformation tap-based dielectric duplexer of claim 1, wherein the ladder impedance transformation taps are respectively coupled with the dielectric resonators closest to the ladder impedance transformation tap in the two filter channels, and a debugging hole is arranged between the ladder impedance transformation tap and the dielectric resonator closest to the ladder impedance transformation tap and used for limiting the external coupling strength of the filter channels.
6. The dielectric duplexer based on the stepped impedance transformation tap according to claim 1, wherein the dielectric plate is a dielectric with any dielectric constant, and a metal coating is provided on an outer surface of the dielectric plate.
7. The ladder impedance transformation tap-based dielectric duplexer of claim 1, wherein the input connector is provided with an inner conductor and an outer conductor sleeved on an outer layer of the inner conductor, and the inner conductor is connected with one section of the transmission line of the ladder impedance transformation tap.
8. A small-sized duplexer applying the step impedance transformation tap as claimed in any one of claims 1 to 7, comprising an upper dielectric plate and a lower dielectric plate which are laminated with each other, wherein the upper dielectric plate is provided with a first filtering channel A, a second filtering channel A and a common channel coupled with the first filtering channel A and the second filtering channel A respectively, and the lower dielectric plate is further provided with a first filtering channel B arranged opposite to the first filtering channel A and a second filtering channel B arranged opposite to the second filtering channel A;
the first filtering channel A, the first filtering channel B, the second filtering channel A and the second filtering channel B are all sequentially provided with a plurality of dielectric filters along the axis direction, the dielectric filters between the first filtering channel A and the first filtering channel B are correspondingly arranged up and down, the dielectric filters between the second filtering channel A and the second filtering channel B are correspondingly arranged up and down, the adjacent dielectric filters are in coupling connection, and the dielectric filters which correspond up and down are in coupling connection;
the first filtering channel A and the second filtering channel A are both provided with output connectors coupled with the corresponding dielectric resonators, the common channel is provided with an input connector, the input connector is internally provided with the stepped impedance transformation tap, and the stepped impedance transformation tap is respectively coupled with one of the dielectric resonators in the first filtering channel A and the second filtering channel A.
9. The miniature duplexer of claim 8, wherein a separation wall for reducing the coupling strength between the first filtering channel a and the second filtering channel a is disposed between the first filtering channel a and the second filtering channel a.
10. The miniature duplexer of claim 8, wherein the upper dielectric plate and the lower dielectric plate are provided with dual-hole magnetic coupling tuning holes for defining coupling strength between the adjacent dielectric resonators;
the upper dielectric plate and the lower dielectric plate are provided with corresponding annular gap electric coupling structures, and the annular gap electric coupling structures are used for the negative coupling connection of the dielectric resonators which are correspondingly arranged up and down;
the upper dielectric plate and the lower dielectric plate are provided with corresponding strip-shaped gap magnetic coupling structures, and the strip-shaped gap magnetic coupling structures are used for positive coupling connection of the dielectric resonators which are arranged in an up-down corresponding mode.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112670682A (en) * | 2020-12-24 | 2021-04-16 | 人民华智通讯技术有限公司 | Medium duplexer based on novel common cavity structure |
| US20210320390A1 (en) * | 2018-12-26 | 2021-10-14 | Huawei Technologies Co., Ltd. | Dielectric Duplexer |
| CN114530677A (en) * | 2022-01-27 | 2022-05-24 | 恒尔威科技(苏州)有限公司 | Ultra-wideband miniaturized cavity combiner |
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