CN114899564B - Band-controllable low-profile double-band balanced dielectric resonator filter - Google Patents
Band-controllable low-profile double-band balanced dielectric resonator filter Download PDFInfo
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- CN114899564B CN114899564B CN202210571735.4A CN202210571735A CN114899564B CN 114899564 B CN114899564 B CN 114899564B CN 202210571735 A CN202210571735 A CN 202210571735A CN 114899564 B CN114899564 B CN 114899564B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
- H01P1/2135—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using strip line 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
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention belongs to the technical field of microwave communication, and particularly relates to a low-profile double-frequency-band balanced dielectric resonator filter with a controllable frequency band. The low-dielectric-constant-ratio antenna comprises a lower metal floor, a lower low-dielectric-constant dielectric substrate, a high-dielectric-constant dielectric substrate, an upper low-dielectric-constant dielectric substrate and an upper metal floor which are sequentially stacked from bottom to top, wherein a first feeder line, a second feeder line, a third feeder line and a fourth feeder line are arranged on the upper surface of the lower low-dielectric-constant dielectric substrate; the non-metallized through holes, the first metallized through hole group and the second metallized through hole group form a honeycomb type medium block; the first metallized through hole group and the second metallized through hole group are symmetrically arranged about the central line of the honeycomb type medium block, so that independent control of a low-frequency band or a high-frequency band is realized. On the basis of ensuring small loss of the balanced dielectric filter, the invention realizes independent and controllable dual-band, improves the integration level, reduces the profile, reduces the cost and the like.
Description
Technical Field
The invention belongs to the technical field of microwave communication, and particularly relates to a low-profile double-frequency-band balanced dielectric resonator filter with a controllable frequency band.
Background
The dual-frequency filtering is an important characteristic of a satellite communication system, processes two signals simultaneously, meets the requirements of miniaturization, low power consumption and low cost of a microwave circuit, and is a hot spot for research in the current industry and academia. Meanwhile, compared with a traditional single-ended circuit, the balanced circuit is widely focused because the balanced circuit is convenient to be connected with other balanced devices and has good environmental noise suppression and electromagnetic interference resistance. In addition, dielectric resonators have been a research hot spot in recent years because of their advantages in terms of high Q value, high temperature stability, high power capacity, and the like. Therefore, the dual-band balanced dielectric resonator filter has important research value and significance.
The currently reported dual-band balanced dielectric resonator filter is mainly realized by two methods: the first method is that the dual-mode dielectric block is directly arranged in the metal cavity, but the structural integration level realized by the method is low, and the dual-mode dielectric block is difficult to integrate with other planar circuits; the second method is to install the dual-mode dielectric block on the substrate, so that the integrated feed structure is convenient to use, and then the dielectric block and the feed structure are integrally arranged in the cavity. The two methods for realizing the balanced type dielectric filter are all made of ceramic dielectric materials and are mostly single-frequency bands, so that a multi-system cannot be met, a dual-frequency band dielectric resonator filter is rarely proposed, and the frequency bands cannot be independently controlled, so that the cost of the filter is relatively high, and the integration level of the dielectric resonator is required to be further improved. Therefore, it is important to provide a balanced dielectric filter with low profile, easy assembly and independently controllable dual frequency bands.
Disclosure of Invention
The design aims at the problems of the technology and provides a low-profile dual-band balanced dielectric resonator filter with controllable frequency bands. The invention aims to realize independent and controllable dual-band on the basis of ensuring small loss of the balanced dielectric filter, improve the integration level, reduce the profile, reduce the cost and the like.
In order to achieve the aim of the invention, the technical scheme adopted by the invention is as follows: the low-profile double-frequency-band balanced type dielectric resonator filter with the controllable frequency band comprises a lower metal floor, a lower low-dielectric-constant dielectric substrate, a high-dielectric-constant dielectric substrate, an upper low-dielectric-constant dielectric substrate and an upper metal floor which are sequentially stacked from bottom to top, wherein a first feeder line, a second feeder line, a third feeder line and a fourth feeder line are arranged on the upper surface of the lower low-dielectric-constant dielectric substrate; the first feeder line and the second feeder line are arranged on one side of the upper surface of the lower low-dielectric-constant dielectric substrate in parallel and are externally connected with a pair of balanced input ports; the third feeder line and the fourth feeder line are arranged on the other side of the upper surface of the lower low-dielectric-constant dielectric substrate in parallel and are externally connected with another pair of balanced output ports; the surface of the high-dielectric-constant dielectric substrate is provided with a non-metallized through hole; the high-dielectric-constant dielectric substrate is symmetrically provided with a first metallized through hole group and a second metallized through hole group about a central line; the non-metallized through holes, the first metallized through hole group and the second metallized through hole group form a honeycomb type medium block; the first metallized through hole group and the second metallized through hole group are symmetrically arranged about the central line of the honeycomb type medium block, so that independent control of a low-frequency band or a high-frequency band is realized.
Further, as a preferred technical scheme of the invention, the number of the first metallized through hole group and the second metallized through hole group is 1, so as to realize control of a low-frequency band.
Further, as a preferred technical scheme of the invention, the number of the first metallized through hole group and the second metallized through hole group is 2, so as to realize control of a high-frequency band.
Further, as a preferred embodiment of the present invention, the lower low-k dielectric substrate and the upper low-k dielectric substrate are RO4003C substrates, which have a dielectric constant of 3.55, a loss angle of 0.0027, and a thickness of 1.13mm, respectively.
Further, as a preferable embodiment of the present invention, the high-permittivity dielectric substrate is a dielectric substrate having a permittivity of 9.9, a loss angle of 0.00015, and a thickness of 3.1 mm.
Compared with the prior art, the low-profile double-frequency-band balanced dielectric resonator filter with controllable frequency bands has the following technical effects: the invention realizes the double-band balanced dielectric resonator filter with the characteristics of low profile, controllable frequency band and high integration level, and simultaneously realizes the independent controllability of double frequency bands, improves the integration level, reduces the profile, reduces the cost and the like on the basis of ensuring the low loss of the balanced dielectric filter. The honeycomb type dielectric block can effectively integrate the two dielectric resonator blocks together, and is convenient to integrate and assemble.
Drawings
FIG. 1 is an exploded view of a balanced dielectric resonator filter according to an embodiment of the invention;
FIG. 2 (a) is a top view of a high-k dielectric substrate according to an embodiment of the present invention;
FIG. 2 (b) is a top view of a second embodiment of a high-k dielectric substrate;
FIG. 3 is a frequency response simulation of a balanced dielectric resonator filter according to an embodiment of the present invention;
in the drawing, a 1-1-lower metal floor, a 1-2-upper metal floor, a 2-1-lower low dielectric constant dielectric substrate, a 2-2-upper low dielectric constant dielectric substrate, a 3-high dielectric constant dielectric substrate, a 4-first feeder line, a 5-second feeder line, a 6-third feeder line, a 7-fourth feeder line, an 8-non-metallized through hole, a 9-first metallized through hole group and a 10-second metallized through hole group are arranged.
Detailed Description
The invention is further explained in the following detailed description with reference to the drawings so that those skilled in the art can more fully understand the invention and can practice it, but the invention is explained below by way of example only and not by way of limitation.
As shown in fig. 1, a low-profile dual-band balanced dielectric resonator filter with controllable frequency band comprises a lower metal floor 1-1, a lower low-dielectric-constant dielectric substrate 2-1, a high-dielectric-constant dielectric substrate 3, an upper low-dielectric-constant dielectric substrate 2-2 and an upper metal floor 1-2 which are sequentially stacked from bottom to top, wherein a first feeder line 4, a second feeder line 5, a third feeder line 6 and a fourth feeder line 7 are arranged on the upper surface of the lower low-dielectric-constant dielectric substrate 2-1; the first feeder line 4 and the second feeder line 5 are arranged on one side of the upper surface of the lower low-dielectric constant dielectric substrate 2-1 in parallel and are externally connected with a pair of balanced input ports; the third feeder line 6 and the fourth feeder line 7 are arranged on the other side of the upper surface of the lower low-dielectric constant medium substrate 2-1 in parallel and are externally connected with another pair of balanced output ports; the surface of the high-dielectric-constant dielectric substrate 3 is provided with a non-metallized through hole 8; the high-dielectric-constant dielectric substrate 3 is symmetrically provided with a first metalized through hole group 9 and a second metalized through hole group 10 about a central line; the non-metallized through holes 8, the first metallized through hole group 9 and the second metallized through hole group 10 form a honeycomb type medium block; the first metallized through hole group 9 and the second metallized through hole group 10 are symmetrically arranged about the central line of the honeycomb type dielectric block, and the independent control of a low-frequency band or a high-frequency band is realized.
The low-profile double-frequency-band balanced dielectric resonator filter with controllable frequency bands provided by the invention has the advantages that signals are input from a pair of balanced ports, namely a first feeder line 4 and a second feeder line 5, resonance modes in the strip dielectric resonator are excited, the signals are coupled to another strip dielectric resonator, and then the signals are output through another pair of balanced output ports, namely a third feeder line 6 and a fourth feeder line 7. Two structural features exist for balanced dual-band dielectric resonators: 1. the main structure part is a resonator with a metal dielectric substrate and a honeycomb dielectric block loaded in the dielectric substrate, and compared with the traditional ceramic-combined metal cavity filter, the resonator has a lower section; 2. the first metallized via group 9 and the second metallized via group 10 on the high-k dielectric substrate 3 can realize independent control of two frequency bands respectively. It can be seen that the band-shaped dielectric substrate integrated filter formed by the resonator has the characteristics of low profile and independently controllable frequency bands.
In particular, when excited by a differential mode signal, a low frequency mode TE, which acts as a strip dielectric resonator, may be excited y 111 Mode and high frequency mode TE z 11δ Mode, signal coupling excitation to TE in another dielectric resonator y 111 Mode and TE z 11δ Mode, thereby constructing two differential mode operation pass bands of low frequency and high frequency, and in the low frequency differential mode pass band and the high frequency differential mode pass bandTwo transmission zeros are respectively generated at two sides, and four transmission zeros are generated in total, so that the frequency selectivity is improved.
As shown in fig. 2 (a), affects the low frequency TE y 111 Mode for high frequency TE z 11δ The mode has little influence, so the number of the first metallized through hole group 9 and the second metallized through hole group 10 is 1, and the control of the low frequency band can be realized; when the metal through holes are positioned on both sides of the center line of the honeycomb dielectric block, as shown in FIG. 2 (b), the high-frequency TE is affected z 11δ Mode, for low frequency TE y 111 The influence of the mode is small, so the number of the first metallized through hole group 9 and the second metallized through hole group 10 is 2, and the control of the high frequency band can be realized. Thereby realizing independent control of the two frequency bands.
When excited by common mode signals, TE can be excited to form a strip-shaped dielectric resonator z 311 Mode, signal coupling excitation to TE in another strip dielectric resonator z 311 Mode, but due to TE operating in common mode z 311 Mode and TE operating in differential mode y 111 Mode and TE z 11δ The modes are not in the same frequency, so that the balanced dielectric filter has better common mode rejection performance in the range of the differential mode working passband of the designed balanced dielectric filter. The invention combines the upper layer and the lower layer of the substrate with metal ground with a layer of metallized through holes and non-metallized through holes to work in TE y 111 Mode and TE z 11δ The honeycomb type dielectric substrate integrated resonator of the mode realizes a dual-band balanced dielectric resonator filter with the characteristics of low profile, controllable frequency band and high integration level.
The center frequencies of the two frequency bands are set to be 11.32GHz and 12.4GHz respectively, the frequency response simulation diagram is shown in fig. 3, transmission zeros at two sides of the low-frequency differential mode passband are respectively located at 10.9GHz and 11.49GHz, and transmission zeros at two sides of the high-frequency differential mode passband are respectively located at 12.34GHz and 12.6GHz. The 3-dB relative bandwidths are respectively 0.78% and 0.74%, the minimum insertion loss is respectively 1.11dB and 1.1dB, the common mode rejection in the low-frequency pass band is greater than 20dB, and the common mode rejection in the high-frequency pass band is greater than 19dB, so that the rejection of common mode signals in the differential-mode pass band is effectively ensured. The physical dimensions of the filter were 70mm by 40mm by 5.366mm. The lower low-dielectric-constant dielectric substrate 2-1 and the upper low-dielectric-constant dielectric substrate 2-2 are respectively RO4003C substrates, the dielectric constant is 3.55, the loss angle is 0.0027, and the thicknesses are respectively 1.13mm. The high-permittivity dielectric substrate 3 was a dielectric substrate having a permittivity of 9.9, a loss angle of 0.00015, and a thickness of 3.1 mm.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (5)
1. The low-profile double-frequency-band balanced type dielectric resonator filter with the controllable frequency band comprises a lower metal floor (1-1), a lower low-dielectric-constant dielectric substrate (2-1), a high-dielectric-constant dielectric substrate (3), an upper low-dielectric-constant dielectric substrate (2-2) and an upper metal floor (1-2), which are sequentially stacked from bottom to top, and is characterized in that a first feeder line (4), a second feeder line (5), a third feeder line (6) and a fourth feeder line (7) are arranged on the upper surface of the lower low-dielectric-constant dielectric substrate (2-1); the first feeder line (4) and the second feeder line (5) are arranged on one side of the upper surface of the lower low-dielectric-constant dielectric substrate (2-1) in parallel and are externally connected with a pair of balanced input ports; the third feeder line (6) and the fourth feeder line (7) are arranged on the other side of the upper surface of the lower low-dielectric constant medium substrate (2-1) in parallel and are externally connected with another pair of balanced output ports; a non-metallized through hole (8) is formed on the surface of the high-dielectric-constant dielectric substrate (3); the high-dielectric-constant dielectric substrate (3) is symmetrically provided with a first metalized through hole group (9) and a second metalized through hole group (10) about a central line; the non-metallized through holes (8), the first metallized through hole group (9) and the second metallized through hole group (10) form a honeycomb type medium block; the first metallized through hole group (9) and the second metallized through hole group (10) are symmetrically arranged about the central line of the honeycomb type medium block, so that independent control of a low-frequency band or a high-frequency band is realized.
2. The low-profile dual-band balanced dielectric resonator filter with controllable frequency band according to claim 1, wherein the number of the first metallized through hole group (9) and the second metallized through hole group (10) is 1, so as to realize the control of the low-frequency band.
3. The low-profile dual-band balanced dielectric resonator filter with controllable frequency band according to claim 1, wherein the number of the first metallized through hole group (9) and the second metallized through hole group (10) is 2, so as to realize the control of high-frequency band.
4. The low-profile dual-band balanced dielectric resonator filter with controllable frequency band according to claim 1, wherein the lower low-k dielectric substrate (2-1) and the upper low-k dielectric substrate (2-2) are RO4003C substrates, which have a dielectric constant of 3.55, a loss angle of 0.0027, and a thickness of 1.13mm, respectively.
5. The low-profile dual-band balanced dielectric resonator filter with controllable frequency band according to claim 1, characterized in that the dielectric substrate (3) with high dielectric constant has a dielectric constant of 9.9, a loss angle of 0.00015 and a thickness of 3.1 mm.
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2022
- 2022-05-24 CN CN202210571735.4A patent/CN114899564B/en active Active
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