Dual-band dielectric resonator filter power divider

Abstract

A dual-band dielectric resonator filter power divider comprises a first metal ground, a first low-k dielectric substrate, a second low-k dielectric substrate, a high-k dielectric substrate, a third low-k dielectric substrate, a fourth low-k dielectric substrate, and a second metal ground, stacked in sequence. The high-k dielectric substrate comprises first and second strip-shaped dielectric blocks. The second and third low-k dielectric substrates are each provided with a plurality of through-holes. The third low-k dielectric substrate is provided with a pair of balanced input ports and a pair of balanced output ports on a surface opposite the high-k dielectric substrate. A resistor is connected between the balanced output ports. This application utilizes two strip-shaped dielectric blocks loaded with a resonator comprising a low-k dielectric substrate with a plurality of through-holes introduced above and below, combined with an isolation resistor loaded at the output end, to achieve a dual-band dielectric resonator filter power divider with low loss, high frequency selectivity, a low profile, ease of integration, and high isolation.

Description

Technical Field

[0001] The present application relates to the field of microwave communication technology, and in particular to a dual-band dielectric resonator filter power divider. Background Art

[0002] With the rapid development of wireless communication technology, multi-band, multi-functional systems that process large amounts of data have been widely researched, making RF circuits more complex. Dual-band devices, which can simultaneously process signals in two frequency bands and reduce system complexity, have become a research hotspot in both industry and academia in recent years. Furthermore, differential-to-single-ended filtering power splitters not only offer the common-mode noise suppression capabilities of traditional differential circuits, but also combine filtering and power distribution functions in a single device, effectively improving system integration and having significant implications for the development of wireless systems. Therefore, applying dual-band technology to differential-to-single-ended filtering power splitters holds significant research value and significance. Summary of the Invention

[0003] In view of this, it is necessary to provide a dual-band dielectric resonator filter power divider that can integrate the functions of a dual-band device and a differential to single-ended filter power divider.

[0004] The embodiment of the present application discloses a dual-band dielectric resonator filter power divider, comprising a first metal ground, a first low-dielectric constant dielectric substrate, a second low-dielectric constant dielectric substrate, a high-dielectric constant dielectric substrate, a third low-dielectric constant dielectric substrate, a fourth low-dielectric constant dielectric substrate and a second metal ground, which are stacked in sequence; the high-dielectric constant dielectric substrate comprises a first strip dielectric block, a second strip dielectric block, a first fixed connection block and a second fixed connection block, the first strip dielectric block is connected to the second strip dielectric block via a first dielectric connection strip, the first strip dielectric block is also connected to the first fixed connection block via a second dielectric connection strip, and the second strip dielectric block is also connected to the second fixed connection block via a third dielectric connection strip; the second low-dielectric constant dielectric substrate is provided with a plurality of first through holes, the third low-dielectric constant dielectric substrate is provided with a plurality of first through holes, and the third low-dielectric constant dielectric substrate is provided with a plurality of first through holes. The board is provided with a plurality of second through holes. The first dielectric strip block, the second dielectric strip block, the second low-k dielectric substrate, the first low-k dielectric substrate, and the first metal ground constitute a first dielectric strip resonator. The first dielectric strip block, the second dielectric strip block, the third low-k dielectric substrate, the fourth low-k dielectric substrate, and the second metal ground constitute a second dielectric strip resonator. The third low-k dielectric substrate is further provided with a pair of balanced input ports and a pair of balanced output ports on a surface opposite the high-k dielectric substrate. A resistor is connected between the pair of balanced output ports. The pair of balanced input ports are used to receive signals to excite a resonant mode of the second dielectric strip resonator. The signals are coupled to excite a resonant mode of the first dielectric strip resonator and are then output through the pair of balanced output ports.

[0005] By adopting the above technical solution, Model and The invention relates to a dual-band dielectric resonator filter power divider, wherein the main structure is a resonator composed of a first strip dielectric block and a second strip dielectric block loaded with a low dielectric constant substrate having a plurality of through holes introduced on the upper and lower sides, and the output ports are isolated by resistors. The invention realizes a dual-band dielectric resonator filter power divider with the characteristics of low loss, high frequency selectivity, low profile, easy integration and high isolation. The resistors can achieve high isolation between the two output ports. By arranging the differential input port (balanced input port) and the single-ended output port (balanced output port) on the same low dielectric constant dielectric substrate, cross coupling is easily generated, a transmission zero point is realized, and frequency selectivity is improved.

[0006] In some embodiments, the first strip-shaped dielectric block, the second dielectric connection strip, and the first fixed connection block are symmetrically arranged with respect to the first dielectric connection strip, as are the second strip-shaped dielectric block, the third dielectric connection strip, and the second fixed connection block.

[0007] By adopting the above technical solution, by symmetrically arranging the first strip dielectric block, the second dielectric connecting strip, and the first fixed connecting block with the second strip dielectric block, the third dielectric connecting strip, and the second fixed connecting block, the cross-sectional height of the dual-band dielectric resonator filter power divider can be reduced, so that the dual-band dielectric resonator filter power divider has excellent low-profile characteristics.

[0008] In some embodiments, the plurality of first through holes and the plurality of second through holes are distributed in an array.

[0009] By adopting the above technical solution, the dielectric loss of the first strip dielectric resonator can be reduced by providing first through holes distributed in an array on the second low dielectric constant dielectric substrate, and the dielectric loss of the second strip dielectric resonator can be reduced by providing second through holes distributed in an array on the third low dielectric constant dielectric substrate, so that the dual-band dielectric resonator filter power divider has good low-loss characteristics.

[0010] In some embodiments, a first metal feed line, a second metal feed line, a third metal feed line, a fourth metal feed line, a first metal strip, a first resistor, and a second resistor are provided on the surface of the third low dielectric constant dielectric substrate opposite to the high dielectric constant dielectric substrate. The first metal feed line and the second metal feed line serve as the pair of balanced input ports, the third metal feed line and the fourth metal feed line serve as the pair of balanced output ports, one end of the first metal strip is electrically connected to one end of the first resistor, the other end of the first resistor is electrically connected to the third metal feed line, the other end of the first metal strip is electrically connected to one end of the second resistor, and the other end of the second resistor is electrically connected to the fourth metal feed line.

[0011] By adopting the above technical solution, by setting a first metal strip, a first resistor and a second resistor at the two output ports, a 180° phase difference and power absorption function can be provided to achieve high isolation between the two output ports, and power distribution between the two output ports can also be achieved through the first resistor and the second resistor.

[0012] In some embodiments, the first metal feed line and the second metal feed line are symmetrically arranged relative to the first metal strip, and the third metal feed line and the fourth metal feed line are symmetrically arranged relative to the first metal strip.

[0013] By adopting the above technical solution, the transmission impedance of the differential signal can be made consistent through the two symmetrically arranged input ports and the two symmetrically arranged output ports, thereby reducing the common mode component and reflection.

[0014] In some embodiments, the third metal feed line and the fourth metal feed line are both L-shaped feed lines, the first resistor is electrically connected to the shorter side of the third metal feed line, and the second resistor is electrically connected to the shorter side of the fourth metal feed line.

[0015] By adopting the above technical solution, by setting the two output ports to be L-shaped, it is convenient to set the two output ports to be equal in length, and by electrically connecting the two resistors to the shorter side of the L-shaped feed line, the differential signal can have the same transmission impedance when output through the two output ports, which can further reduce the common-mode component.

[0016] In some embodiments, both the first strip-shaped dielectric block and the second strip-shaped dielectric block are rectangular dielectric blocks.

[0017] By adopting the above technical solution, a resonator with a low dielectric constant substrate having a plurality of through holes introduced on the upper and lower sides is loaded with a first strip dielectric block and a second strip dielectric block having a rectangular main structure, so that the resonator can work Model and mode, and the rectangular strip dielectric block has good high-order mode suppression capability, which can improve the out-of-band suppression of the resonator.

[0018] In some embodiments, the dual-band dielectric resonator filter power divider also includes a fixing member, and the first metal ground, the first low dielectric constant dielectric substrate, the second low dielectric constant dielectric substrate, the high dielectric constant dielectric substrate, the third low dielectric constant dielectric substrate, the fourth low dielectric constant dielectric substrate and the second metal ground, which are stacked in sequence, are all provided with mounting holes at corresponding positions. The fixing member passes through each mounting hole in sequence to fix the first metal ground, the first low dielectric constant dielectric substrate, the second low dielectric constant dielectric substrate, the high dielectric constant dielectric substrate, the third low dielectric constant dielectric substrate, the fourth low dielectric constant dielectric substrate and the second metal ground together.

[0019] By adopting the above technical solution, the first metal ground, the first low-dielectric constant dielectric substrate, the second low-dielectric constant dielectric substrate, the high-dielectric constant dielectric substrate, the third low-dielectric constant dielectric substrate, the fourth low-dielectric constant dielectric substrate and the second metal ground can be assembled through the fixing parts and the mounting holes, which facilitates integrated packaging while ensuring the performance of the dual-band dielectric resonator filter power divider.

[0020] The embodiment of the present application also discloses a dual-band dielectric resonator filter power divider, comprising a first metal ground, a first low-dielectric constant dielectric substrate, a second low-dielectric constant dielectric substrate, a high-dielectric constant dielectric substrate, a third low-dielectric constant dielectric substrate, a fourth low-dielectric constant dielectric substrate and a second metal ground, which are stacked in sequence; the high-dielectric constant dielectric substrate comprises a first strip dielectric block, a second strip dielectric block, a first fixed connection block and a second fixed connection block, the first strip dielectric block is connected to the second strip dielectric block via a first dielectric connection strip, the first strip dielectric block is also connected to the first fixed connection block via a second dielectric connection strip, and the second strip dielectric block is also connected to the second fixed connection block via a third dielectric connection strip; a first cross-shaped slot is provided on the second low-dielectric constant dielectric substrate, a second cross-shaped slot is provided on the third low-dielectric constant dielectric substrate, and the first cross-shaped air slot and the second cross-shaped slot are both distributed along the x-axis and y-axis directions. The projections of the first and second strip dielectric blocks in the z-axis direction fall within the first cross-shaped air slot and the second cross-shaped air slot. The first strip dielectric block, the second strip dielectric block, the second low-k dielectric substrate, the first low-k dielectric substrate, and the first metal ground constitute a first strip dielectric resonator. The first strip dielectric block, the second strip dielectric block, the third low-k dielectric substrate, the fourth low-k dielectric substrate, and the second metal ground constitute a second strip dielectric resonator. The third low-k dielectric substrate is further provided with a pair of balanced input ports and a pair of balanced output ports on a surface opposite to the high-k dielectric substrate. A resistor is connected between the pair of balanced output ports. The pair of balanced input ports are used to receive signals to excite a resonant mode of the second strip dielectric resonator. The signals are coupled to excite a resonant mode of the first strip dielectric resonator and are then output through the pair of balanced output ports.

[0021] By adopting the above technical solution, Model and A dual-band dielectric resonator filter power divider with low loss, high frequency selectivity, low profile, easy integration, and high isolation can be realized by using a resonator whose main structure is a first strip dielectric block and a second strip dielectric block loaded with a low dielectric constant substrate with upper and lower air slots, combined with a method of isolating the output ports by setting resistors. High isolation between the two output ports can be achieved by using resistors. By setting the differential input port (balanced input port) and the single-ended output port (balanced output port) on the same low dielectric constant dielectric substrate, cross coupling is easily generated, a transmission zero point is realized, and frequency selectivity is improved.

[0022] In some embodiments, a first metal feed line, a second metal feed line, a third metal feed line, a fourth metal feed line, a first metal strip, a first resistor, and a second resistor are provided on a surface of the third low-k dielectric substrate opposite to the high-k dielectric substrate. The first metal feed line and the second metal feed line serve as the pair of balanced input ports, the third metal feed line and the fourth metal feed line serve as the pair of balanced output ports, one end of the first metal strip is electrically connected to one end of the first resistor, the other end of the first resistor is electrically connected to the third metal feed line, the other end of the first metal strip is electrically connected to one end of the second resistor, the other end of the second resistor is electrically connected to the fourth metal feed line, and the first metal strip is located in the second cross-shaped air slot.

[0023] By adopting the above technical solution, by setting a first metal strip, a first resistor and a second resistor at the two output ports, a 180° phase difference and power absorption function can be provided to achieve high isolation between the two output ports, and power distribution between the two output ports can also be achieved through the first resistor and the second resistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a cross-sectional view of an embodiment of the dual-band dielectric resonator filter power divider of the present application.

[0026] Figure 2 This is an exploded view of an embodiment of the dual-band dielectric resonator filter power divider of the present application.

[0027] Figure 3a This is a differential mode response simulation diagram of an embodiment of the dual-band dielectric resonator filter power divider of the present application.

[0028] Figure 3b This is a common-mode response simulation diagram of an embodiment of the dual-band dielectric resonator filter power divider of the present application.

[0029] Figure 4 This is an exploded view of another embodiment of the dual-band dielectric resonator filter power divider of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application.

[0031] It is understood that the connection relationships described in this application refer to direct or indirect connections. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B via one or more other electrical components. For example, A and C can be directly connected, and C can be directly connected to B, so that A and B are connected through C. It is also understood that the description of "A connecting to B" in this application can be a direct connection between A and B or an indirect connection between A and B via one or more other electrical components.

[0032] In the description of this application, unless otherwise specified, " / " means "or". For example, A / B can mean A or B. "And / or" in this document is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0033] In the description of this application, words such as "first" and "second" are used only to distinguish different objects and do not limit the quantity or execution order. In addition, words such as "first" and "second" do not necessarily mean different. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0034] The technical solution of the present application is further described in detail below with reference to the accompanying drawings.

[0035] See also Figure 1 and Figure 2 , a dual-band dielectric resonator filter power divider 10 is provided in one embodiment of the present application. The dual-band dielectric resonator filter power divider 10 includes a first metal ground 11, a first low-dielectric constant dielectric substrate 12, a second low-dielectric constant dielectric substrate 13, a high-dielectric constant dielectric substrate 14, a third low-dielectric constant dielectric substrate 15, a fourth low-dielectric constant dielectric substrate 16, and a second metal ground 17, which are stacked in sequence. The first metal ground 11 and the second metal ground 17 can be metal floors, such as a circuit board with a copper-clad surface. The high-dielectric constant dielectric substrate can refer to a dielectric substrate with a dielectric constant greater than a first preset value, and the low-dielectric constant dielectric substrate can refer to a dielectric substrate with a dielectric constant less than a second preset value. The first preset value can be greater than or equal to the second preset value. The first preset value and the second preset value can be set according to actual microwave communication requirements.

[0036] like Figure 2As shown, the high-k dielectric substrate 14 includes a first strip-shaped dielectric block 141, a second strip-shaped dielectric block 142, a first fixed connection block 143, and a second fixed connection block 144. The first strip-shaped dielectric block 141 is connected to the second strip-shaped dielectric block 142 via a first dielectric connection strip 145. The first strip-shaped dielectric block 141 is further connected to the first fixed connection block 143 via a second dielectric connection strip 146. The second strip-shaped dielectric block 142 is further connected to the second fixed connection block 144 via a third dielectric connection strip 147.

[0037] In some embodiments, the first strip-shaped dielectric block 141 and the second strip-shaped dielectric block 142 may have the same shape and size, and the first fixed connection block 143 and the second fixed connection block 144 may have the same shape and size. The first strip-shaped dielectric block 141, the second dielectric connection strip 146, and the first fixed connection block 143 are symmetrically arranged with the second strip-shaped dielectric block 142, the third dielectric connection strip 147, and the second fixed connection block 144 relative to the first dielectric connection strip 145. The shape and size of the first strip-shaped dielectric block 141 and the second strip-shaped dielectric block 142 can be set according to actual application requirements. For example, if both the first strip-shaped dielectric block 141 and the second strip-shaped dielectric block 142 are rectangular dielectric blocks, the dielectric connection strips (145-147) can be connected to the longer side of the rectangular dielectric block.

[0038] A plurality of first through holes 131 are provided on the second low-dielectric constant dielectric substrate 13. A plurality of second through holes 151 are provided on the third low-dielectric constant dielectric substrate 15. The plurality of first through holes 131 and the plurality of second through holes 151 can be distributed in an array. The first through holes and the second through holes 151 have the same size, and the opening position of the second through holes 151 can be optionally corresponding to the opening position of the first through holes 131, so that the input differential signal can excite the resonant mode of the two resonators (the first strip dielectric resonator and the second strip dielectric resonator described below) in the dual-band dielectric resonator filter power divider 10. The sizes of the first through holes 131 and the second through holes 151 can be set and adjusted according to the actual application scenario.

[0039] A pair of balanced input ports 152 - 153 and a pair of balanced output ports 154 - 155 are further provided on the surface of the third low-k dielectric substrate 15 facing the high-k dielectric substrate 14 . A resistor is connected between the pair of balanced output ports 154 - 155 .

[0040] The first dielectric strip block 141, the second dielectric strip block 142, the second low-k dielectric substrate 13, the first low-k dielectric substrate 12, and the first metal ground 11 may constitute a first dielectric strip resonator. The first dielectric strip block 141, the second dielectric strip block 142, the third low-k dielectric substrate 15, the fourth low-k dielectric substrate 16, and the second metal ground 17 may constitute a second dielectric strip resonator.

[0041] A pair of balanced input ports 152-153 can be used to receive signals, such as differential signals or common-mode signals. The following description uses differential signal reception as an example. A differential signal can be input through the pair of balanced input ports 152-153, exciting the resonant mode of the second strip resonator. The signal is then coupled to the first strip resonator, exciting the resonant mode of the first strip resonator, and then output through the pair of balanced output ports 154-155. Power can be distributed between the pair of balanced output ports 154-155 using resistors.

[0042] Specifically, when a differential signal is input from a pair of balanced input ports 152-153, a strip dielectric resonator can be excited. Model and The signal coupling excites two modes in another strip dielectric resonator, thereby realizing the fusion of filtering and power distribution functions in two frequency bands. In addition, since an isolation circuit composed of resistors is set between the balanced output ports 154 and 155, a 180° phase difference and power absorption can be provided, so that the pair of balanced output ports 154 and 155 have isolation characteristics. At the same time, due to the cross coupling between the input port and the output port, transmission zeros are generated at the edges of the two passbands, thereby improving the frequency selectivity. When a common mode signal is input, the strip dielectric resonator can be excited. Since the common mode and the differential mode do not resonate at the same frequency, the dual-band dielectric resonator filter power divider 10 has good common mode rejection characteristics.

[0043] like Figure 2 As shown, the isolation circuit may specifically include a first resistor 156, a second resistor 157, and a first metal strip 158. One end of the first metal strip 158 is electrically connected to one end of the first resistor 156, and the other end of the first resistor 156 is electrically connected to the output port 154. The other end of the first metal strip 158 is electrically connected to one end of the second resistor 157, and the other end of the second resistor 157 is electrically connected to the output port 155. The power distribution ratio of the pair of balanced output ports 154-155 can be adjusted by adjusting the ratio of the first resistor 156 to the second resistor 157. For example, if both the first resistor and the second resistor are 50Ω, the power can be equally divided.

[0044] In some embodiments, a pair of balanced input ports 152-153 may be composed of a first metal feed line and a second metal feed line, and a pair of balanced output ports 154-155 may be composed of a third metal feed line and a fourth metal feed line. The first metal feed line, the second metal feed line, the third metal feed line, the fourth metal feed line, and the first metal strip 158 may all be microstrip lines printed on the third low-k dielectric substrate 15. The width of the first metal strip 158 may be greater than the width of each metal feed line (the first to fourth metal feed lines). The first metal feed line and the second metal feed line may have the same shape and size, and the third metal feed line and the fourth metal feed line may have the same shape and size. For example, the first metal feed line and the second metal feed line may be symmetrically arranged relative to the first metal strip 158, and the third metal feed line and the fourth metal feed line may also be symmetrically arranged relative to the first metal strip 158.

[0045] In some embodiments, the third metal feed line and the fourth metal feed line may both be L-shaped feed lines, the first resistor 156 is electrically connected to the shorter side of the third metal feed line, and the second resistor 157 is electrically connected to the shorter side of the fourth metal feed line.

[0046] In some embodiments, in order to facilitate the integrated packaging of the dual-band dielectric resonator filter power divider 10, the first metal ground 11, the first low dielectric constant dielectric substrate 12, the second low dielectric constant dielectric substrate 13, the high dielectric constant dielectric substrate 14, the third low dielectric constant dielectric substrate 15, the fourth low dielectric constant dielectric substrate 16 and the second metal ground 17, which are stacked in sequence, are provided with mounting holes at corresponding positions. Fixing members (not shown) can be passed through each mounting hole in sequence to fix the first metal ground 11, the first low dielectric constant dielectric substrate 12, the second low dielectric constant dielectric substrate 13, the high dielectric constant dielectric substrate 14, the third low dielectric constant dielectric substrate 15, the fourth low dielectric constant dielectric substrate 16 and the second metal ground 17 together. The fixing members can be selected according to actual assembly requirements. For example, the fixing members can include bolts and nuts. Figure 2 As shown, mounting holes 18 may be provided at corresponding positions on both sides of the first metal ground 11, the first low-k dielectric substrate 12, the second low-k dielectric substrate 13, the high-k dielectric substrate 14, the third low-k dielectric substrate 15, the fourth low-k dielectric substrate 16 and the second metal ground 17.

[0047] For example, the physical size of the dual-band dielectric resonator filter power divider 10 is 50mm×50mm×5.366mm. The first low dielectric constant dielectric substrate 12 and the fourth low dielectric constant dielectric substrate 16 can be RO4003C substrates, whose dielectric constant is 3.55, the loss angle is 0.0027, and the thickness is 0.203mm. The second low dielectric constant dielectric substrate 13 and the third low dielectric constant dielectric substrate 15 can be RO4003C substrates, whose dielectric constant is 3.55, the loss angle is 0.0027, and the thickness is 0.913mm. The high dielectric constant dielectric substrate 14 can be an RO3010 substrate, whose dielectric constant is 9.9, the loss angle is 0.00015, and the thickness is 3.1mm. The center frequencies of the dual-band dielectric resonator filter power divider 10 are set to 11.36GHz and 12.37GHz respectively. The differential mode response simulation diagram of the dual-band dielectric resonator filter power divider 10 is shown in FIG. Figure 3a As shown in the following figure, the common mode response simulation diagram is as follows Figure 3b As shown. Figure 3a In the simulation curve S dd11 is the differential mode matching curve, the simulation curve S sd21 is the differential mode transmission curve, the simulation curve S ss32 is the output port isolation curve. Figure 3b In the simulation curve S cc11 is the common mode matching curve, the simulation curve S sc21 is the common mode transmission curve. Figure 3a 、 3b It can be seen that the transmission zero points on both sides of the low-frequency differential mode passband are located at 11.21GHz and 11.60GHz respectively, and the transmission zero points on both sides of the high-frequency differential mode passband are located at 12.27GHz and 12.93GHz respectively. Their 3-dB relative bandwidths are 0.75% and 0.73% respectively, and the minimum insertion losses are 1.3dB and 1.17dB respectively. The isolation level in the low-frequency passband reaches 22dB, and the common-mode rejection level reaches 27.3dB. The isolation level in the high-frequency passband is 18dB, and the rejection level reaches 28.5dB. The dual-band dielectric resonator filter power divider 10 has good isolation performance and common-mode rejection characteristics.

[0048] See also Figure 4 Another embodiment of the present application provides a dual-band dielectric resonator filter power divider 20. The dual-band dielectric resonator filter power divider 20 includes a first metal ground 21, a first low-k dielectric substrate 22, a second low-k dielectric substrate 23, a high-k dielectric substrate 24, a third low-k dielectric substrate 25, a fourth low-k dielectric substrate 26, and a second metal ground 27, which are stacked in sequence.

[0049] A first cross-shaped slot 231 is provided on the second low-k dielectric substrate 23, and a second cross-shaped slot 251 is provided on the third low-k dielectric substrate 25. Both the first cross-shaped slot 231 and the second cross-shaped slot 251 are distributed along the x-axis and the y-axis. The first cross-shaped slot 231 and the second cross-shaped slot 251 can have the same shape and size, so that an input differential signal can excite the resonant modes of the first and second strip dielectric resonators in the dual-band dielectric resonator filter power divider 10.

[0050] The high-k dielectric substrate 24 includes a first strip-shaped dielectric block 241, a second strip-shaped dielectric block 242, a first fixed connection block 243, and a second fixed connection block 244. The first strip-shaped dielectric block 241 is connected to the second strip-shaped dielectric block 242 via a first dielectric connection strip 245. The first strip-shaped dielectric block 241 is further connected to the first fixed connection block 243 via a second dielectric connection strip 246. The second strip-shaped dielectric block 242 is further connected to the second fixed connection block 244 via a third dielectric connection strip 247.

[0051] In some embodiments, the first strip-shaped dielectric block 241 and the second strip-shaped dielectric block 242 may have the same shape and size, and the first fixed connection block 243 and the second fixed connection block 244 may have the same shape and size. The first strip-shaped dielectric block 241, the second dielectric connection strip 246, and the first fixed connection block 243 are symmetrically arranged with the second strip-shaped dielectric block 242, the third dielectric connection strip 247, and the second fixed connection block 244 relative to the first dielectric connection strip 245. The shape and size of the first strip-shaped dielectric block 241 and the second strip-shaped dielectric block 242 can be set according to actual application requirements. For example, if both the first strip-shaped dielectric block 241 and the second strip-shaped dielectric block 242 are rectangular dielectric blocks, the dielectric connection strips (245-247) can be connected to the longer side of the rectangular dielectric block.

[0052] The projections of the first strip-shaped dielectric block 241 and the second strip-shaped dielectric block 242 in the z-axis direction fall into the first cross-shaped air slot 231 and fall into the second cross-shaped air slot 251 .

[0053] A pair of balanced input ports 252 - 253 and a pair of balanced output ports 254 - 255 are further provided on the surface of the third low-k dielectric substrate 25 opposite to the high-k dielectric substrate 24 . A resistor is connected between the pair of balanced output ports 254 - 255 .

[0054] The first dielectric strip block 241, the second dielectric strip block 242, the second low-k dielectric substrate 23, the first low-k dielectric substrate 22, and the first metal ground 21 form a first dielectric strip resonator. The first dielectric strip block 241, the second dielectric strip block 242, the third low-k dielectric substrate 25, the fourth low-k dielectric substrate 26, and the second metal ground 27 form a second dielectric strip resonator.

[0055] A pair of balanced input ports 252-253 can be used to receive signals, such as differential signals or common-mode signals. The following description uses differential signal reception as an example. A differential signal can be input through the pair of balanced input ports 252-253, exciting the resonant mode of the second strip resonator. The signal is then coupled to the first strip resonator, exciting the resonant mode of the first strip resonator, and then output through the pair of balanced output ports 254-255. Power can be distributed between the pair of balanced output ports 254-255 using resistors.

[0056] Specifically, when a differential signal is input from a pair of balanced input ports 252-253, a strip dielectric resonator can be excited. Model and The signal coupling excites two modes in another strip dielectric resonator, thereby realizing the fusion of filtering and power distribution functions in two frequency bands. In addition, due to the inclusion of an isolation circuit, a 180° phase difference and power absorption are provided, so that a pair of balanced output ports 254-255 have isolation characteristics. At the same time, due to the cross coupling between the input port and the output port, transmission zeros are generated at the edges of the two passbands, thereby improving the frequency selectivity. When a common mode signal is input, the strip dielectric resonator can be excited to Since the common mode and the differential mode do not resonate at the same frequency, the dual-band dielectric resonator filter power divider 20 has good common mode rejection characteristics.

[0057] like Figure 4 As shown, the isolation circuit may include a first resistor 256, a second resistor 257, and a first metal strip 258. The first metal strip 258 is located within the second cross-shaped air slot 251. One end of the first metal strip 258 is electrically connected to one end of the first resistor 256, the other end of the first resistor 256 is electrically connected to the output port 254, and the other end of the first metal strip 258 is electrically connected to one end of the second resistor 257, the other end of the second resistor 257 is electrically connected to the output port 255. The power distribution ratio of the pair of balanced output ports 254-255 can be adjusted by adjusting the ratio of the first resistor 256 to the second resistor 257. For example, if both the first resistor and the second resistor are 50Ω, the power can be equally distributed.

[0058] In some embodiments, a pair of balanced input ports 252-253 may be composed of a first metal feed line and a second metal feed line, and a pair of balanced output ports 254-255 may be composed of a third metal feed line and a fourth metal feed line. The first metal feed line, the second metal feed line, the third metal feed line, the fourth metal feed line, and the first metal strip 258 may all be microstrip lines printed on the third low-k dielectric substrate 25. The width of the first metal strip 258 may be greater than the width of each metal feed line (the first to fourth metal feed lines). The first metal feed line and the second metal feed line may have the same shape and size, and the third metal feed line and the fourth metal feed line may have the same shape and size. For example, the first metal feed line, the second metal feed line, the third metal feed line, and the fourth metal feed line may all be long strip feed lines.

[0059] In some embodiments, in order to facilitate the integrated packaging of the dual-band dielectric resonator filter power divider 20, the first metal ground 21, the first low-k dielectric substrate 22, the second low-k dielectric substrate 23, the high-k dielectric substrate 24, the third low-k dielectric substrate 25, the fourth low-k dielectric substrate 26, and the second metal ground 27, which are stacked in sequence, are provided with mounting holes at corresponding positions. Fixing members can be passed through each mounting hole in sequence to fix the first metal ground 21, the first low-k dielectric substrate 22, the second low-k dielectric substrate 23, the high-k dielectric substrate 24, the third low-k dielectric substrate 25, the fourth low-k dielectric substrate 26, and the second metal ground 27 together. Figure 4 As shown, mounting holes 28 may be provided at corresponding positions on both sides of the first metal ground 21, the first low-k dielectric substrate 22, the second low-k dielectric substrate 23, the high-k dielectric substrate 24, the third low-k dielectric substrate 25, the fourth low-k dielectric substrate 26, and the second metal ground 27.

[0060] The dual-band dielectric resonator filter power divider provided in the present application has a structure in which two rectangular strip dielectric blocks are sandwiched in the middle, and both sides are connected to the fixed connecting block at the top using a thinner dielectric connecting strip, which effectively reduces the cross-sectional height of the entire device and makes it easy to integrate.

[0061] The dual-band dielectric resonator filter power divider of the present application also has the following beneficial effects:

[0062] (1) By adopting Model and The module uses a rectangular strip dielectric block as the main structure, loaded with a low-dielectric-constant substrate with several non-metallized through-holes introduced on the top and bottom. Combined with the output end loading isolation circuit, a dual-band dielectric resonator filter power divider with low loss, high frequency selectivity, low profile, easy integration and high isolation is realized.

[0063] (2) High isolation between the two output ports (balanced output ports 154-155) is achieved through the isolation circuit;

[0064] (3) By arranging the differential input port (balanced input ports 152 to 153 / 252 to 253) and the single-ended output port (balanced output ports 154 to 155 / 254 to 255) on the same low-dielectric constant dielectric substrate (third low-dielectric constant dielectric substrate 15 / 25), cross-coupling is easily generated, transmission zeros are achieved, and frequency selectivity is improved;

[0065] (4) The high-dielectric-constant dielectric substrate, each low-dielectric-constant dielectric substrate, and the metal grounds on both sides are assembled using the mounting holes, facilitating integrated packaging while ensuring device performance.

[0066] For those skilled in the art, other corresponding changes or adjustments can be made according to the application scheme and application concept of this application in combination with the actual needs of production, and these changes and adjustments should fall within the scope disclosed in this application.

Claims

1. A dual-band dielectric resonator filter power divider, characterized in that: It includes a first metal ground, a first low-k dielectric substrate, a second low-k dielectric substrate, a high-k dielectric substrate, a third low-k dielectric substrate, a fourth low-k dielectric substrate and a second metal ground, which are stacked in sequence; The high dielectric constant dielectric substrate includes a first strip dielectric block, a second strip dielectric block, a first fixed connection block, and a second fixed connection block. The first strip dielectric block is connected to the second strip dielectric block via a first dielectric connection strip. The first strip dielectric block is also connected to the first fixed connection block via a second dielectric connection strip. The second strip dielectric block is also connected to the second fixed connection block via a third dielectric connection strip. A plurality of first through holes are provided on the second low-k dielectric substrate, and a plurality of second through holes are provided on the third low-k dielectric substrate; The first dielectric strip block, the second dielectric strip block, the second low-k dielectric substrate, the first low-k dielectric substrate, and the first metal ground constitute a first dielectric strip resonator. The first dielectric strip block, the second dielectric strip block, the third low-k dielectric substrate, the fourth low-k dielectric substrate, and the second metal ground constitute a second dielectric strip resonator. The third low-k dielectric substrate is further provided with a pair of balanced input ports and a pair of balanced output ports on a surface opposite to the high-k dielectric substrate, with a resistor connected between the pair of balanced output ports. The pair of balanced input ports is used to receive signals to excite the resonant mode of the second strip dielectric resonator. The signal coupling excites the resonant mode of the first strip dielectric resonator and is then output through the pair of balanced output ports.

2. The dual-band dielectric resonator filter power divider according to claim 1, wherein: The first strip-shaped dielectric block, the second dielectric connection strip, and the first fixed connection block are symmetrically arranged with respect to the first dielectric connection strip, as are the second strip-shaped dielectric block, the third dielectric connection strip, and the second fixed connection block.

3. The dual-band dielectric resonator filter power divider according to claim 1, wherein: The plurality of first through holes and the plurality of second through holes are distributed in an array.

4. The dual-band dielectric resonator filter power divider according to claim 1 or 3, characterized in that: A first metal feed line, a second metal feed line, a third metal feed line, a fourth metal feed line, a first metal strip, a first resistor, and a second resistor are provided on a surface of the third low-k dielectric substrate opposite to the high-k dielectric substrate. The first metal feed line and the second metal feed line serve as the pair of balanced input ports, the third metal feed line and the fourth metal feed line serve as the pair of balanced output ports, one end of the first metal strip is electrically connected to one end of the first resistor, the other end of the first resistor is electrically connected to the third metal feed line, the other end of the first metal strip is electrically connected to one end of the second resistor, and the other end of the second resistor is electrically connected to the fourth metal feed line.

5. The dual-band dielectric resonator filter power divider according to claim 4, wherein: The first metal feed line and the second metal feed line are symmetrically arranged relative to the first metal strip, and the third metal feed line and the fourth metal feed line are symmetrically arranged relative to the first metal strip.

6. The dual-band dielectric resonator filter power divider according to claim 5, wherein: The third metal feed line and the fourth metal feed line are both L-shaped feed lines, the first resistor is electrically connected to a shorter side of the third metal feed line, and the second resistor is electrically connected to a shorter side of the fourth metal feed line.

7. The dual-band dielectric resonator filter power divider according to claim 1, wherein: The first strip-shaped dielectric block and the second strip-shaped dielectric block are both rectangular dielectric blocks.

8. The dual-band dielectric resonator filter power divider according to claim 1, wherein: The dual-band dielectric resonator filter power divider also includes a fixing member. The first metal ground, the first low-dielectric constant dielectric substrate, the second low-dielectric constant dielectric substrate, the high-dielectric constant dielectric substrate, the third low-dielectric constant dielectric substrate, the fourth low-dielectric constant dielectric substrate, and the second metal ground, which are stacked in sequence, are all provided with mounting holes at corresponding positions. The fixing member passes through each mounting hole in sequence to fix the first metal ground, the first low-dielectric constant dielectric substrate, the second low-dielectric constant dielectric substrate, the high-dielectric constant dielectric substrate, the third low-dielectric constant dielectric substrate, the fourth low-dielectric constant dielectric substrate, and the second metal ground together.

9. A dual-band dielectric resonator filter power divider, characterized in that: It includes a first metal ground, a first low-k dielectric substrate, a second low-k dielectric substrate, a high-k dielectric substrate, a third low-k dielectric substrate, a fourth low-k dielectric substrate and a second metal ground, which are stacked in sequence; The high dielectric constant dielectric substrate includes a first strip dielectric block, a second strip dielectric block, a first fixed connection block, and a second fixed connection block. The first strip dielectric block is connected to the second strip dielectric block via a first dielectric connection strip. The first strip dielectric block is also connected to the first fixed connection block via a second dielectric connection strip. The second strip dielectric block is also connected to the second fixed connection block via a third dielectric connection strip. A first cross-shaped slot is provided on the second low-k dielectric substrate, and a second cross-shaped slot is provided on the third low-k dielectric substrate. The first cross-shaped slot and the second cross-shaped slot are both distributed along the x-axis and the y-axis. The projections of the first strip-shaped dielectric block and the second strip-shaped dielectric block in the z-axis direction fall within the first cross-shaped slot and the second cross-shaped slot. The first dielectric strip block, the second dielectric strip block, the second low-k dielectric substrate, the first low-k dielectric substrate, and the first metal ground constitute a first dielectric strip resonator. The first dielectric strip block, the second dielectric strip block, the third low-k dielectric substrate, the fourth low-k dielectric substrate, and the second metal ground constitute a second dielectric strip resonator. The third low-k dielectric substrate is further provided with a pair of balanced input ports and a pair of balanced output ports on a surface opposite to the high-k dielectric substrate, with a resistor connected between the pair of balanced output ports. The pair of balanced input ports is used to receive signals to excite the resonant mode of the second strip dielectric resonator. The signal coupling excites the resonant mode of the first strip dielectric resonator and is then output through the pair of balanced output ports.

10. The dual-band dielectric resonator filter power divider according to claim 9, wherein: A first metal feed line, a second metal feed line, a third metal feed line, a fourth metal feed line, a first metal strip, a first resistor, and a second resistor are provided on a surface of the third low-k dielectric substrate opposite to the high-k dielectric substrate. The first metal feed line and the second metal feed line serve as the pair of balanced input ports, and the third metal feed line and the fourth metal feed line serve as the pair of balanced output ports. One end of the first metal strip is electrically connected to one end of the first resistor, and the other end of the first resistor is electrically connected to the third metal feed line. The other end of the first metal strip is electrically connected to one end of the second resistor, and the other end of the second resistor is electrically connected to the fourth metal feed line. The first metal strip is located in the second cross-shaped slot.

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