CN117155324A - Miniaturized multi-zero wide stop band on-chip band-pass filter - Google Patents
Miniaturized multi-zero wide stop band on-chip band-pass filter Download PDFInfo
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- CN117155324A CN117155324A CN202311111548.9A CN202311111548A CN117155324A CN 117155324 A CN117155324 A CN 117155324A CN 202311111548 A CN202311111548 A CN 202311111548A CN 117155324 A CN117155324 A CN 117155324A
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- 239000003990 capacitor Substances 0.000 claims abstract description 76
- 230000008878 coupling Effects 0.000 claims abstract description 51
- 238000010168 coupling process Methods 0.000 claims abstract description 51
- 238000005859 coupling reaction Methods 0.000 claims abstract description 51
- 239000002184 metal Substances 0.000 claims description 7
- 238000013461 design Methods 0.000 abstract description 9
- 238000003780 insertion Methods 0.000 abstract description 3
- 230000037431 insertion Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H2001/0021—Constructional details
- H03H2001/005—Wound, ring or feed-through type inductor
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Abstract
The invention discloses a miniaturized multi-zero wide stop band on-chip band-pass filter. The filter comprises four grounded series LC resonant circuits and a pair of electromagnetic hybrid coupling units, wherein the filter comprises eight lumped inductances, eight lumped capacitances and four zeros, and the series LC resonant circuits control the zeros. The zero points at the two ends of the pass band promote the selectivity of the filter, and the zero points at the high-frequency far end expand the stop band of the filter. The filter topology adopts lumped parameter original design, and the zero point position, the center frequency and the like are adjusted by changing the inductance and capacitance values so as to meet different design requirements. The filter realizes capacitance through a flat capacitor and inductance through an octagonal spiral inductor. Compared with a general square inductor, the octagonal spiral inductor has a higher Q value, and can realize smaller insertion loss and better selectivity. The size of the filter is smaller by reasonably arranging the positions of the inductor and the capacitor.
Description
Technical Field
The invention relates to a miniaturized multi-zero wide stop band on-chip band-pass filter, belonging to the technical field of microwaves and radio frequency.
Background
Nowadays, mobile communication enters the 5G era, and demands for miniaturization, selectivity and stop band characteristics of filters are increasing. With the development of microwave passive devices, it is a necessary trend to integrate devices operating in different frequency bands into one system module. In order to efficiently accommodate multiple frequency bands while providing adequate suppression therebetween. The miniaturized filter plays an irreplaceable role. Filters are commonly used in radio frequency communication systems to suppress harmonics and ensure efficient transmission of signals to antennas, so that the performance of the filter as an important component in radio frequency transceiver systems has a great impact on the overall wireless communication system. Meanwhile, in order to avoid interference between different frequency bands, it is also necessary to design a miniaturized band-pass filter with a wide stop band.
A common approach to achieving a miniaturized wide stop band filter is to use a step-impedance resonator. However, the method belongs to a design method of a distributed parameter filter, and compared with a lumped parameter filter, the size of the distributed parameter filter is related to the wavelength, which is unfavorable for miniaturization of the filter. The invention provides a lumped parameter-based wide stopband bandpass filter, which widens the stopband of the filter by introducing multiple zero points and improves the out-of-band rejection performance of the filter.
In view of the foregoing, it is desirable to design a miniaturized multi-zero wide stop band on-chip bandpass filter to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a miniaturized multi-zero wide stop band on-chip band-pass filter.
In order to achieve the above purpose, the invention provides a miniaturized multi-zero wide stop band on-chip band-pass filter, which adopts the following technical scheme:
the filter comprises eight lumped inductors, eight lumped capacitors and four zeros, wherein the four zeros are located on four grounded series LC resonance circuits, and the series LC resonance circuits control the zeros.
As a further improvement of the invention, in the four grounded series LC resonance circuits, the first grounded series LC resonance circuit and the fourth grounded series LC resonance circuit are respectively positioned at two ends of the circuit, and the second grounded series LC resonance circuit and the third grounded series LC resonance circuit are symmetrically positioned in the middle of the circuit; the second zero point and the third zero point are positioned at two ends of the pass band, and the first zero point and the fourth zero point are positioned at the far end of the high-frequency pass band; the first and fourth grounded series LC resonance circuits control the first and fourth zeros, and the second and third grounded series LC resonance circuits control the second and third zeros.
As a further improvement of the invention, the eight lumped inductances are a second spiral inductance, a third spiral inductance, a fourth spiral inductance, a fifth spiral inductance and two pairs of coupled inductances; the eight lumped capacitors are two first capacitors, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a pair of grounding capacitors for matching; the pair of electromagnetic coupling units are a first electromagnetic coupling unit and a second electromagnetic coupling unit.
As a further improvement of the invention, two ends of the filter are respectively provided with a feed port, the left feed port is connected with the upper electrode plate of the first capacitor, the lower electrode plate of the first capacitor is divided into two paths, one path is connected with the lower electrode plate of the second capacitor, and the other path is converted into an upper layer to be connected with one end of the first electromagnetic coupling unit; the other end of the first electromagnetic coupling unit is connected with the upper electrode plate of the third capacitor and the upper electrode plate of the fourth capacitor, and the upper electrode plate of the third capacitor and the upper electrode plate of the fourth capacitor are connected with one end of the second electromagnetic coupling unit; the other end of the second electromagnetic coupling unit is turned into a lower layer and is respectively connected with a lower layer polar plate of the first capacitor and a lower layer polar plate of the fifth capacitor, and an upper layer polar plate of the first capacitor is connected with a right feed port; the upper electrode plate of the second capacitor is connected with one end of the second spiral inductor, and the other end of the second spiral inductor is led out in a bridging manner and is grounded through a metal through hole to form a grounded series resonant circuit; the third capacitor and the third spiral inductor, the fourth capacitor and the fourth spiral inductor, and the fifth capacitor and the fifth spiral inductor form a series resonant circuit which is grounded in the same way.
As a further development of the invention, the lumped inductances are each in the form of planar octagonal spiral inductances.
As a further improvement of the invention, all the lumped capacitors are made of MIM metal plates.
As a further improvement of the invention, the first electromagnetic coupling unit and the second electromagnetic coupling unit are identical in structure and size, and are symmetrical about the center of the filter.
As a further improvement of the present invention, the first electromagnetic coupling unit and the second electromagnetic coupling unit are each composed of a pair of coupling inductors and a grounded capacitance, and the pair of coupling inductors have both electric coupling and magnetic coupling.
As a further improvement of the invention, the coupling inductance of the electromagnetic coupling unit crosses inward spiral at one place in a bridging way and is connected with the grounding capacitance.
As a further improvement of the invention, the second spiral inductor and the fourth spiral inductor are grounded through a metal through hole.
The beneficial effects are that:
the filter topology adopts lumped parameter original design, and the position and the center frequency of the zero point are adjusted by changing the values of the inductance and the capacitance, so that different design requirements can be met; transmission zeros at both ends of the pass band promote the selectivity of the filter, and transmission zeros at the far end of the high-frequency pass band expand the stop band of the filter; compared with a common square inductor, the octagonal spiral inductor adopted by the filter has a higher Q value, smaller insertion loss and better selectivity; by rationally arranging the locations of the inductances and capacitances, the size of the filter can be made smaller.
Drawings
FIG. 1 is a schematic circuit diagram of a miniaturized multi-zero wide stop band on-chip bandpass filter of the invention;
FIG. 2 is a perspective view of a miniaturized multi-zero wide stop band on-chip bandpass filter according to the invention;
FIG. 3 is a top view of FIG. 2;
fig. 4 is a schematic diagram of filter performance.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and/or processing steps closely related to aspects of the present invention are shown in the drawings, and other details not greatly related to the present invention are omitted.
The invention provides a miniaturized multi-zero wide stop band on-chip band-pass filter, which comprises eight lumped inductors, eight lumped capacitors and four zeros, wherein the zeros are controlled by a series LC resonance circuit. The inductor adopts a planar octagonal spiral inductor, and the capacitor adopts an MIM plate capacitor.
As shown in fig. 1, the filter circuit schematic includes eight lumped capacitances and eight lumped inductances. The pair of electromagnetic coupling units are a first electromagnetic coupling unit U1 and a second electromagnetic coupling unit U1', the structures and the sizes of the first electromagnetic coupling unit U1 and the second electromagnetic coupling unit U1' are identical, the first electromagnetic coupling unit U1 and the second electromagnetic coupling unit U1 'are symmetrical about the center of the filter, the first electromagnetic coupling unit U1 and the second electromagnetic coupling unit U1' are composed of a pair of coupling inductors and a grounding capacitor, the pair of coupling inductors are electrically coupled and magnetically coupled, and the electromagnetic coupling units mainly control ripple characteristics in a band.
The filter has four zero points, two zero points are positioned at two ends of the pass band, the other two zero points are positioned at the far end of the high-frequency pass band, the transmission zero points positioned at two ends of the pass band improve the selectivity of the filter, and the transmission zero points positioned at the far end of the high-frequency pass band expand the stop band of the filter. The two zero points at the two ends of the passband are respectively controlled by a grounded series LC resonance circuit consisting of a third capacitor 3 and a third spiral inductor 3', and a fourth capacitor 4 and a fourth spiral inductor 4', and the circuit is positioned in the middle of the circuit. And a series LC resonance circuit formed by the second capacitor 2 and the second spiral inductor 2', the fifth capacitor 5 and the fifth spiral inductor 5' respectively controls two zero points at the far end of the high-frequency passband, and the circuit is positioned at two ends of the circuit. The first capacitances 1 and 1' at the two ends of the filter act as a match.
As shown in fig. 1 to 3, the technical implementation scheme can be divided into the following steps:
step one: original value extraction
And building a physical model of the inductor and the capacitor according to the theoretical original value of the target circuit, extracting the original value of each original, and primarily determining the physical size of each lumped original.
Step two: construction of integral physical model
Because of parasitic effects and the possible occurrence of unnecessary coupling between the various elements, further optimization and adjustment are required after the overall physical model construction is completed; the overall layout of the filter physical model is as follows: two ends of the filter are respectively provided with a feed port, the left feed port 11 is connected with an upper electrode plate of the first capacitor 1, the lower electrode plate of the first capacitor 1 is divided into two paths, one path is connected with a lower electrode plate of the second capacitor 2, and the other path is converted into an upper layer to be connected with one end of the first electromagnetic coupling unit U1; the other end of the first electromagnetic coupling unit U1 is connected with an upper electrode plate of the third capacitor 3 and an upper electrode plate of the fourth capacitor 4, and the upper electrode plate of the third capacitor 3 and the upper electrode plate of the fourth capacitor 4 are connected with one end of the second electromagnetic coupling unit U1'; the other end of the second electromagnetic coupling unit U1 'is converted into a lower layer and is respectively connected with a lower layer polar plate of the first capacitor 1' and a lower layer polar plate of the fifth capacitor 5, and an upper layer polar plate of the first capacitor 1 'is connected with the right feed port 11'; the upper electrode plate of the second capacitor 2 is connected with one end of a second spiral inductor 2', and the other end of the second spiral inductor 2' is led out in a bridging manner and is grounded through a metal through hole to form a grounded series resonant circuit; the third capacitor 3 and the third spiral inductor 3', the fourth capacitor 4 and the fourth spiral inductor 4', and the fifth capacitor 5 and the fifth spiral inductor 5' form a series resonant circuit grounded in the same manner as described above.
Step three: performance optimization of filter physical model
After the positions of all the elements of the filter are reasonably distributed, the HFSS software is utilized to optimize the performance of the filter, and finally, the performance which is identical with the circuit simulation result is obtained. As shown in fig. 4, the filter has four zeros tz1, tz2, tz3 and tz4, two zeros tz1 and tz2 located at two ends of the pass band, and the other two zeros tz1 and tz2 located at two ends of the pass band raise the selectivity of the filter, and zeros tz3 and tz4 located at the far ends of the pass band expand the stop band of the filter. Wherein two zero points tz1 and tz2 at two ends of the passband are respectively controlled by a grounded series LC resonant circuit formed by a third capacitor 3 and a third spiral inductor 3', and a fourth capacitor 4 and a fourth spiral inductor 4'. And the series LC resonance circuit formed by the second capacitor 2 and the second spiral inductor 2', the fifth capacitor 5 and the fifth spiral inductor 5' respectively control two zero points tz3 and tz4 at the far end of the high-frequency passband. The first capacitors 1 and 1' at the two ends of the filter and the first electromagnetic coupling unit U1 and the second electromagnetic coupling unit U2 play a role in adjusting in-band transmission and reflection characteristics.
In summary, the filter topology of the invention adopts the lumped parameter original design, and the position and the center frequency of the zero point are adjusted by changing the values of the inductance and the capacitance, so that different design requirements can be satisfied; transmission zeros at both ends of the pass band promote the selectivity of the filter, and transmission zeros at the far end of the high-frequency pass band expand the stop band of the filter; compared with a common square inductor, the octagonal spiral inductor adopted by the filter has a higher Q value, smaller insertion loss and better selectivity; by rationally arranging the locations of the inductances and capacitances, the size of the filter can be made smaller.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. The miniaturized multi-zero wide stop band on-chip band-pass filter is characterized by comprising eight lumped inductors, eight lumped capacitors and four zeros, wherein the four zeros are positioned on four grounded series LC resonance circuits, and the series LC resonance circuits control the zeros.
2. The miniaturized multi-zero wide stop band on-chip band pass filter of claim 1, wherein the four grounded series LC resonant circuits, the first grounded series LC resonant circuit and the fourth grounded series LC resonant circuit are respectively located at two ends of the circuit, and the second grounded series LC resonant circuit and the third grounded series LC resonant circuit are symmetrically located in the middle of the circuit; the second zero point and the third zero point are positioned at two ends of the pass band, and the first zero point and the fourth zero point are positioned at the far end of the high-frequency pass band; the first and fourth grounded series LC resonance circuits control the first and fourth zeros, and the second and third grounded series LC resonance circuits control the second and third zeros.
3. The miniaturized multi-zero wide stop band on-chip bandpass filter of claim 1 wherein the eight lumped inductors are a second spiral inductor, a third spiral inductor, a fourth spiral inductor, a fifth spiral inductor, and two pairs of coupled inductors; the eight lumped capacitors are two first capacitors, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a pair of grounding capacitors for matching; the pair of electromagnetic coupling units are a first electromagnetic coupling unit and a second electromagnetic coupling unit.
4. A miniaturized multi-zero wide stop band on-chip band-pass filter according to claim 3, wherein two ends of the filter are respectively provided with a feed port, a left feed port is connected with an upper electrode plate of the first capacitor, a lower electrode plate of the first capacitor is divided into two paths, one path is connected with a lower electrode plate of the second capacitor, and the other path is converted into an upper layer to be connected with one end of the first electromagnetic coupling unit; the other end of the first electromagnetic coupling unit is connected with the upper electrode plate of the third capacitor and the upper electrode plate of the fourth capacitor, and the upper electrode plate of the third capacitor and the upper electrode plate of the fourth capacitor are connected with one end of the second electromagnetic coupling unit; the other end of the second electromagnetic coupling unit is turned into a lower layer and is respectively connected with a lower layer polar plate of the first capacitor and a lower layer polar plate of the fifth capacitor, and an upper layer polar plate of the first capacitor is connected with a right feed port; the upper electrode plate of the second capacitor is connected with one end of the second spiral inductor, and the other end of the second spiral inductor is led out in a bridging manner and is grounded through a metal through hole to form a grounded series resonant circuit; the third capacitor and the third spiral inductor, the fourth capacitor and the fourth spiral inductor, and the fifth capacitor and the fifth spiral inductor form a series resonant circuit which is grounded in the same way.
5. A miniaturized multi-zero wide stop band on-chip bandpass filter according to claim 1 wherein the lumped inductances are each in the form of planar octagonal spiral inductances.
6. A miniaturized multi-zero wide stop band on-chip bandpass filter according to claim 1 wherein the lumped capacitors are all MIM metal plates.
7. A miniaturized multi-zero wide stop band on-chip bandpass filter according to claim 3 wherein the first electromagnetic coupling unit and the second electromagnetic coupling unit are identical in structure and size and are symmetrical about the center of the filter.
8. A miniaturized multi-zero wide stop band on-chip bandpass filter according to claim 3 wherein the first and second electromagnetic coupling units are each comprised of a pair of coupling inductors having both electrical and magnetic coupling therebetween and a grounded capacitance.
9. A miniaturized multi-zero wide stop band on-chip bandpass filter according to claim 3 wherein the coupling inductance of the electromagnetic coupling unit crosses inward spiral in one place by bridging and is connected to ground capacitance.
10. A miniaturized multi-zero wide stop band on-chip bandpass filter according to claim 3 wherein the second spiral inductor and the fourth spiral inductor are grounded through a metal via.
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| CN202311111548.9A CN117155324A (en) | 2023-08-31 | 2023-08-31 | Miniaturized multi-zero wide stop band on-chip band-pass filter |
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| CN202311111548.9A CN117155324A (en) | 2023-08-31 | 2023-08-31 | Miniaturized multi-zero wide stop band on-chip band-pass filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117614408A (en) * | 2024-01-24 | 2024-02-27 | 南京邮电大学 | Lumped filter phase shifter circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117614408A (en) * | 2024-01-24 | 2024-02-27 | 南京邮电大学 | Lumped filter phase shifter circuit |
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