CN110867632A - Loaded capacitive band-pass filter based on ceramic dielectric material - Google Patents
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Abstract
The invention discloses a loading capacitance type band-pass filter based on ceramic dielectric materials, which belongs to the technical field of communication and comprises an input impedance matching circuit, an output impedance matching circuit, a first inductance mutual coupling unit, a second inductance mutual coupling unit, a third inductance mutual coupling unit, a fourth inductance mutual coupling unit, a fifth inductance mutual coupling unit, a sixth inductance mutual coupling unit, a capacitor C8, a capacitor C10, a capacitor C12, a capacitor C15, a capacitor C17 and a capacitor C18, and solves the technical problem of providing a band-pass filter which can be suitable for high-frequency band and steep stop band attenuation on the premise of small volume, the circuit structure of the invention divides the processing of signals into two branches, the phase difference of the signal zero points of the two branches at the output port is exactly 180 degrees, so that most of the two signals can be mutually counteracted, and an out-band zero point required by steep stop band is formed at a high-frequency point, the generation of the out-of-band zero greatly accelerates the stop-band attenuation.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a loading capacitance type band-pass filter based on a ceramic dielectric material.
Background
The miniaturization and high performance are great directions since the whole miniature electronic device industry, along with the rapid development of science and technology, in a transceiver module, a component, a phased array radar and various military and civil communication systems, the index requirements of the devices in the transceiver module, the component, the phased array radar and the various military and civil communication systems are more and more severe, a filter is taken as an important device in the communication system, and the research of the miniaturization becomes a hot problem of the filter industry on the basis of ensuring the high performance of the filter.
At present, many band pass filters with high suppression requirements are designed by adopting the structure of fig. 1, wherein an inductor L6 and a capacitor C1 form a first inductive mutual coupling unit, an inductor L7 and a capacitor C2 form a second inductive mutual coupling unit, an inductor L8 and a capacitor C3 form a third inductive mutual coupling unit, an inductor L9 and a capacitor C4 form a fourth inductive mutual coupling unit, an inductor L10 and a capacitor C5 form a fifth inductive mutual coupling unit, and an inductor L11 and a capacitor C6 form a sixth inductive mutual coupling unit, such a band pass filter directly combining 6 inductive mutual coupling units together is difficult to meet the requirements of band pass filtering of high-frequency band signals, and if a common distribution element is adopted, small-size and steep stop-band attenuation cannot be realized.
Conventional bandpass filter designs are generally designed to increase the attenuation of the high stop-band attenuation by increasing the coupling, which makes the attenuation steeper, and this approach of increasing the number of inductive mutual coupling units does improve the performance of the suppression, but sacrifices other factors such as volume, insertion loss, standing wave, etc.
Disclosure of Invention
The invention aims to provide a loaded capacitive band-pass filter based on a ceramic dielectric material, and solves the technical problem of providing a band-pass filter which can be suitable for high-frequency band and steep stop band attenuation on the premise of small volume.
In order to achieve the purpose, the invention adopts the following technical scheme:
the loading capacitive band-pass filter based on the ceramic dielectric material comprises an input impedance matching circuit, an output impedance matching circuit, a first inductive mutual coupling unit, a second inductive mutual coupling unit, a third inductive mutual coupling unit, a fourth inductive mutual coupling unit, a fifth inductive mutual coupling unit, a sixth inductive mutual coupling unit, a capacitor C8, a capacitor C10, a capacitor C12, a capacitor C15, a capacitor C17 and a capacitor C18;
the input impedance matching circuit comprises an input impedance TERM3, wherein one end of the input impedance TERM3 is connected with a ground wire, and the other end of the input impedance TERM3 is a signal input end;
the first inductive mutual coupling unit comprises an inductor L12 and a capacitor C7, the inductor L12 is connected with the capacitor C7 in parallel, a pin 1 of the inductor L12 is connected with a signal input end, and a pin 2 is connected with a ground wire through a capacitor C8;
the second inductive mutual coupling unit comprises an inductor L14 and a capacitor C9, the inductor L14 is connected with the capacitor C9 in parallel, a pin 1 of the inductor L14 is connected with a pin 1 of the inductor L12 through an inductor L13, and a pin 2 of the inductor L14 is connected with the ground wire through a capacitor C10;
the third inductive mutual coupling unit comprises an inductor L16 and a capacitor C11, the inductor L16 is connected with the capacitor C11 in parallel, a pin 1 of the inductor L16 is connected with a pin 1 of the inductor L14 through an inductor L15, and a pin 2 of the inductor L16 is connected with the ground wire through a capacitor C12;
the fourth inductive mutual coupling unit comprises an inductor L18 and a capacitor C14, the inductor L18 is connected with the capacitor C14 in parallel, a pin 1 of the inductor L18 is connected with a pin 1 of the inductor L16 through an inductor L17, and a pin 2 of the inductor L18 is connected with the ground wire through a capacitor C15;
the fifth inductive mutual coupling unit comprises an inductor L20 and a capacitor C16, the inductor L20 is connected with the capacitor C16 in parallel, a pin 1 of the inductor L20 is connected with a pin 1 of the inductor L18 through an inductor L19, and a pin 2 of the inductor L20 is connected with the ground wire through a capacitor C17;
the sixth inductive mutual coupling unit comprises an inductor L22 and a capacitor C19, the inductor L22 is connected with the capacitor C19 in parallel, a pin 1 of the inductor L22 is connected with a pin 1 of the inductor L20 through an inductor L21, and a pin 2 of the inductor L22 is connected with the ground wire through a capacitor C18;
the output impedance matching circuit comprises an output impedance TERM4, one end of the output impedance TERM4 is connected with a ground wire, the other end of the output impedance TERM4 is connected with a pin 1 of an inductor L22, and the pin 1 of the inductor L22 is a signal output end;
one end of the capacitor C13 is connected to pin 1 of the inductor L14, and the other end is connected to pin 1 of the inductor L20.
Preferably, the input impedance TERM3, the inductor L12, the capacitor C7, the inductor L14, the capacitor C9, the inductor L16, the capacitor C11, the inductor L18, the capacitor C14, the inductor L20, the capacitor C16, the inductor L22, the capacitor C19, the output impedance TERM4, the capacitor C8, the capacitor C10, the capacitor C12, the capacitor C15, the capacitor C17, the capacitor C18, the capacitor C13, the inductor L13, the inductor L15, the inductor L17, the inductor L19, and the inductor L21 are all formed by strip lines.
Preferably, the inductive mutual coupling among the first inductive mutual coupling unit, the second inductive mutual coupling unit, the third inductive mutual coupling unit, the fourth inductive mutual coupling unit, the fifth inductive mutual coupling unit and the sixth inductive mutual coupling unit is a strong coupling method.
Preferably, the signal processing first branch is defined as that after the signal is input through the signal input end, the signal passes through the first inductive mutual coupling unit, the second inductive mutual coupling unit, the third inductive mutual coupling unit, the fourth inductive mutual coupling unit, the fifth inductive mutual coupling unit and the sixth inductive mutual coupling unit one by one, and finally reaches the signal output end;
defining a second branch as a signal, which passes through the first inductive mutual coupling unit, the second inductive mutual coupling unit, the fifth inductive mutual coupling unit and the sixth inductive mutual coupling unit after the signal is input through the signal input end, and finally reaches the signal output end, wherein the second inductive mutual coupling unit and the fifth inductive mutual coupling unit are coupled through a capacitor by a loaded capacitor principle;
the phase of the first branch of the signal processing is obtained according to the following formula:
+90°-90°+90°-90°+90°-90°+90°＝90°；
the phase of the second branch of the signal processing is obtained according to the following formula:
+90°-90°+90°+90°+90°-90°+90°＝270°；
the phase difference between the first signal processing branch and the second signal processing branch is 180 degrees, and a sunken zero point is formed.
The invention relates to a loaded capacitive band-pass filter based on ceramic dielectric materials, which solves the technical problem of providing a band-pass filter which can be suitable for high-frequency band and steep stop band attenuation on the premise of small volume.
Drawings
Fig. 1 is a circuit diagram of a conventional band pass filter in the background art;
FIG. 2 is a circuit diagram of the present invention;
FIG. 3 is an equivalent diagram of the loaded capacitive open ended transmission of the present invention;
FIG. 4 is an equivalent diagram of the loaded capacitive type inductive mutual coupling of the present invention
Fig. 5 is an equivalent diagram of a first branch of signal processing and a second branch of signal processing according to the present invention.
Detailed Description
The capacitive loading band-pass filter based on ceramic dielectric materials shown in fig. 1-5 includes an input impedance matching circuit, an output impedance matching circuit, a first inductive mutual coupling unit, a second inductive mutual coupling unit, a third inductive mutual coupling unit, a fourth inductive mutual coupling unit, a fifth inductive mutual coupling unit, a sixth inductive mutual coupling unit, a capacitor C8, a capacitor C10, a capacitor C12, a capacitor C15, a capacitor C17 and a capacitor C18;
the input impedance matching circuit comprises an input impedance TERM3, wherein one end of the input impedance TERM3 is connected with a ground wire, and the other end of the input impedance TERM3 is a signal input end;
the first inductive mutual coupling unit comprises an inductor L12 and a capacitor C7, the inductor L12 is connected with the capacitor C7 in parallel, a pin 1 of the inductor L12 is connected with a signal input end, and a pin 2 is connected with a ground wire through a capacitor C8;
the second inductive mutual coupling unit comprises an inductor L14 and a capacitor C9, the inductor L14 is connected with the capacitor C9 in parallel, a pin 1 of the inductor L14 is connected with a pin 1 of the inductor L12 through an inductor L13, and a pin 2 of the inductor L14 is connected with the ground wire through a capacitor C10;
the third inductive mutual coupling unit comprises an inductor L16 and a capacitor C11, the inductor L16 is connected with the capacitor C11 in parallel, a pin 1 of the inductor L16 is connected with a pin 1 of the inductor L14 through an inductor L15, and a pin 2 of the inductor L16 is connected with the ground wire through a capacitor C12;
the fourth inductive mutual coupling unit comprises an inductor L18 and a capacitor C14, the inductor L18 is connected with the capacitor C14 in parallel, a pin 1 of the inductor L18 is connected with a pin 1 of the inductor L16 through an inductor L17, and a pin 2 of the inductor L18 is connected with the ground wire through a capacitor C15;
the fifth inductive mutual coupling unit comprises an inductor L20 and a capacitor C16, the inductor L20 is connected with the capacitor C16 in parallel, a pin 1 of the inductor L20 is connected with a pin 1 of the inductor L18 through an inductor L19, and a pin 2 of the inductor L20 is connected with the ground wire through a capacitor C17;
the sixth inductive mutual coupling unit comprises an inductor L22 and a capacitor C19, the inductor L22 is connected with the capacitor C19 in parallel, a pin 1 of the inductor L22 is connected with a pin 1 of the inductor L20 through an inductor L21, and a pin 2 of the inductor L22 is connected with the ground wire through a capacitor C18;
the output impedance matching circuit comprises an output impedance TERM4, one end of the output impedance TERM4 is connected with a ground wire, the other end of the output impedance TERM4 is connected with a pin 1 of an inductor L22, and the pin 1 of the inductor L22 is a signal output end;
one end of the capacitor C13 is connected to pin 1 of the inductor L14, and the other end is connected to pin 1 of the inductor L20.
Preferably, the input impedance TERM3, the inductor L12, the capacitor C7, the inductor L14, the capacitor C9, the inductor L16, the capacitor C11, the inductor L18, the capacitor C14, the inductor L20, the capacitor C16, the inductor L22, the capacitor C19, the output impedance TERM4, the capacitor C8, the capacitor C10, the capacitor C12, the capacitor C15, the capacitor C17, the capacitor C18, the capacitor C13, the inductor L13, the inductor L15, the inductor L17, the inductor L19, and the inductor L21 are all formed by strip lines.
Preferably, the inductive mutual coupling among the first inductive mutual coupling unit, the second inductive mutual coupling unit, the third inductive mutual coupling unit, the fourth inductive mutual coupling unit, the fifth inductive mutual coupling unit and the sixth inductive mutual coupling unit is a strong coupling method.
Preferably, the signal processing first branch is defined as that after the signal is input through the signal input end, the signal passes through the first inductive mutual coupling unit, the second inductive mutual coupling unit, the third inductive mutual coupling unit, the fourth inductive mutual coupling unit, the fifth inductive mutual coupling unit and the sixth inductive mutual coupling unit one by one, and finally reaches the signal output end;
defining a second branch as a signal, which passes through the first inductive mutual coupling unit, the second inductive mutual coupling unit, the fifth inductive mutual coupling unit and the sixth inductive mutual coupling unit after the signal is input through the signal input end, and finally reaches the signal output end, wherein the second inductive mutual coupling unit and the fifth inductive mutual coupling unit are coupled through a capacitor by a loaded capacitor principle;
the phase of the first branch of the signal processing is obtained according to the following formula:
+90°-90°+90°-90°+90°-90°+90°＝90°；
the phase of the second branch of the signal processing is obtained according to the following formula:
+90°-90°+90°+90°+90°-90°+90°＝270°；
the phase difference between the first signal processing branch and the second signal processing branch is 180 degrees, and a sunken zero point is formed.
In this embodiment, the indexes of the band pass filter are: the central frequency is 4200MHz, the frequency range is 3900-4500MHz, the insertion loss is less than or equal to 2.5dB, the standing-wave ratio is less than or equal to 2, and the attenuation of a stop band is as follows: not less than 25dB @ DC-3600MHz, not less than 25dB @4800-5100MHz, length and width dimensions: 4.5mm 3.2 mm.
The circuit structure using the traditional band-pass filter cannot achieve stop band attenuation under the requirement that the whole size must be controlled at 4.5mm x 3.2 mm: the invention adopts the indexes of more than or equal to 25dB @ DC-3600MHz and more than or equal to 25dB @4800-5100MHz, adopts the structure that six inductive mutual coupling units are grounded, and the inductive mutual coupling between the six inductive mutual coupling units is a strong coupling mode.
The invention is summarized uniformly from the connection mode among the two, and the phases of the inductive coupling can be attributed to the inductive coupling one by one, and the phase difference of-90 degrees exists in the phase of the inductive coupling.
As shown in fig. 5, where CC represents capacitive coupling and LL represents inductive coupling, the present invention has two signal processing branches: the first branch of signal processing is that the signal passes through the first inductive mutual coupling unit, the second inductive mutual coupling unit, the third inductive mutual coupling unit, the fourth inductive mutual coupling unit, the fifth inductive mutual coupling unit and the sixth inductive mutual coupling unit in sequence through the signal input port, finally reaches the signal output end, the phase of the signal is calculated to be +90 degrees to 90 degrees +90 degrees, the invention needs to generate a zero point outside the band, namely a sinking zero point, at the output port, the second branch of signal processing preferably has a phase difference of 180 degrees with the signal output by the first branch of signal processing, in order to achieve the effect, the invention provides that the second inductive mutual coupling unit and the fifth inductive mutual coupling unit are loaded with capacitance principle and coupled through a capacitor, then, the second branch of signal processing is that the signal passes through the first inductive mutual coupling unit from the signal input port to the second inductive mutual coupling unit, then to the fifth inductive mutual coupling unit, then to the sixth inductive mutual coupling unit and finally to the signal output port, and the phase is calculated as +90 ° -90 ° +90 ° +90 ° -270 °. Therefore, the phase difference of the signals of the two signal processing branches is 180 degrees, so that most of the phase difference can be mutually counteracted to form a sunken zero point.
The invention realizes stop band attenuation by adjusting the position of the depressed zero: indexes of not less than 25dB @ DC-3600MHz, not less than 25dB @4800-5100 MHz: because each inductive mutual coupling unit is connected with a grounding capacitor in a capacitor loading mode, the formula Zin of the input impedance is 1/jwc-jZ 0cot theta, so that the open-circuit transmission line is greatly shortened, and Z0 is 1 tan theta/wc;
from the above, it can be seen that the fundamental relationship between the characteristic impedance Z0 and the electrical length θ and the frequency forms the position of the notch zero point, and when the electrical length is 90 °, and when the frequency range is 3900-4500MHz, and the characteristic impedance is 0, the frequency is short-circuited by the open transmission line, and the notch zero point is formed.
In this embodiment, the length and width of the final product is 4.5mm × 3.2mm, the frequency range is 3900 + 4500MHz, the center frequency point is 4200MHz, the insertion loss is less than or equal to 2.5dB, the standing-wave ratio is less than or equal to 2, the stop-band attenuation: not less than 25dB @ DC-3600MHz, not less than 25dB @4800-5100 MHz.
The invention relates to a loaded capacitive band-pass filter based on ceramic dielectric materials, which solves the technical problem of providing a band-pass filter which can be suitable for high-frequency band and steep stop band attenuation on the premise of small volume.
Claims (4)
1. The utility model provides a loading electric capacity type band-pass filter based on ceramic dielectric material which characterized in that: the circuit comprises an input impedance matching circuit, an output impedance matching circuit, a first inductive mutual coupling unit, a second inductive mutual coupling unit, a third inductive mutual coupling unit, a fourth inductive mutual coupling unit, a fifth inductive mutual coupling unit, a sixth inductive mutual coupling unit, a capacitor C8, a capacitor C10, a capacitor C12, a capacitor C15, a capacitor C17 and a capacitor C18;
the input impedance matching circuit comprises an input impedance TERM3, wherein one end of the input impedance TERM3 is connected with a ground wire, and the other end of the input impedance TERM3 is a signal input end;
the first inductive mutual coupling unit comprises an inductor L12 and a capacitor C7, the inductor L12 is connected with the capacitor C7 in parallel, a pin 1 of the inductor L12 is connected with a signal input end, and a pin 2 is connected with a ground wire through a capacitor C8;
the second inductive mutual coupling unit comprises an inductor L14 and a capacitor C9, the inductor L14 is connected with the capacitor C9 in parallel, a pin 1 of the inductor L14 is connected with a pin 1 of the inductor L12 through an inductor L13, and a pin 2 of the inductor L14 is connected with the ground wire through a capacitor C10;
the third inductive mutual coupling unit comprises an inductor L16 and a capacitor C11, the inductor L16 is connected with the capacitor C11 in parallel, a pin 1 of the inductor L16 is connected with a pin 1 of the inductor L14 through an inductor L15, and a pin 2 of the inductor L16 is connected with the ground wire through a capacitor C12;
the fourth inductive mutual coupling unit comprises an inductor L18 and a capacitor C14, the inductor L18 is connected with the capacitor C14 in parallel, a pin 1 of the inductor L18 is connected with a pin 1 of the inductor L16 through an inductor L17, and a pin 2 of the inductor L18 is connected with the ground wire through a capacitor C15;
the fifth inductive mutual coupling unit comprises an inductor L20 and a capacitor C16, the inductor L20 is connected with the capacitor C16 in parallel, a pin 1 of the inductor L20 is connected with a pin 1 of the inductor L18 through an inductor L19, and a pin 2 of the inductor L20 is connected with the ground wire through a capacitor C17;
the sixth inductive mutual coupling unit comprises an inductor L22 and a capacitor C19, the inductor L22 is connected with the capacitor C19 in parallel, a pin 1 of the inductor L22 is connected with a pin 1 of the inductor L20 through an inductor L21, and a pin 2 of the inductor L22 is connected with the ground wire through a capacitor C18;
the output impedance matching circuit comprises an output impedance TERM4, one end of the output impedance TERM4 is connected with a ground wire, the other end of the output impedance TERM4 is connected with a pin 1 of an inductor L22, and the pin 1 of the inductor L22 is a signal output end;
one end of the capacitor C13 is connected to pin 1 of the inductor L14, and the other end is connected to pin 1 of the inductor L20.
2. A loaded capacitive bandpass filter based on ceramic dielectric material as claimed in claim 1 wherein: the input impedance TERM3, the inductor L12, the capacitor C7, the inductor L14, the capacitor C9, the inductor L16, the capacitor C11, the inductor L18, the capacitor C14, the inductor L20, the capacitor C16, the inductor L22, the capacitor C19, the output impedance TERM4, the capacitor C8, the capacitor C10, the capacitor C12, the capacitor C15, the capacitor C17, the capacitor C18, the capacitor C13, the inductor L13, the inductor L15, the inductor L17, the inductor L19, and the inductor L21 are all formed by strip lines.
3. A loaded capacitive bandpass filter based on ceramic dielectric material as claimed in claim 1 wherein: the inductive mutual coupling among the first inductive mutual coupling unit, the second inductive mutual coupling unit, the third inductive mutual coupling unit, the fourth inductive mutual coupling unit, the fifth inductive mutual coupling unit and the sixth inductive mutual coupling unit is a strong coupling mode.
4. A loaded capacitive bandpass filter based on ceramic dielectric material as claimed in claim 1 wherein: defining a first branch for signal processing as a signal which is input through the signal input end, then passes through the first inductive mutual coupling unit, the second inductive mutual coupling unit, the third inductive mutual coupling unit, the fourth inductive mutual coupling unit, the fifth inductive mutual coupling unit and the sixth inductive mutual coupling unit one by one, and finally reaches the signal output end;
defining a second branch as a signal, which passes through the first inductive mutual coupling unit, the second inductive mutual coupling unit, the fifth inductive mutual coupling unit and the sixth inductive mutual coupling unit after the signal is input through the signal input end, and finally reaches the signal output end, wherein the second inductive mutual coupling unit and the fifth inductive mutual coupling unit are coupled through a capacitor by a loaded capacitor principle;
the phase of the first branch of the signal processing is obtained according to the following formula:
+90°-90°+90°-90°+90°-90°+90°＝90°；
the phase of the second branch of the signal processing is obtained according to the following formula:
+90°-90°+90°+90°+90°-90°+90°＝270°；
the phase difference between the first signal processing branch and the second signal processing branch is 180 degrees, and a sunken zero point is formed.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112367057A (en) * | 2020-11-09 | 2021-02-12 | 中国科学院微电子研究所 | Frequency hopping filter with composite structure and adjusting method thereof |
| CN112367057B (en) * | 2020-11-09 | 2024-06-25 | 中国科学院微电子研究所 | Composite structure frequency hopping filter and adjusting method thereof |
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2019
- 2019-12-18 CN CN201911309569.5A patent/CN110867632A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112367057A (en) * | 2020-11-09 | 2021-02-12 | 中国科学院微电子研究所 | Frequency hopping filter with composite structure and adjusting method thereof |
| CN112367057B (en) * | 2020-11-09 | 2024-06-25 | 中国科学院微电子研究所 | Composite structure frequency hopping filter and adjusting method thereof |
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