CN106848518B - Double-sided double-slot line transmission line - Google Patents
Double-sided double-slot line transmission line Download PDFInfo
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- CN106848518B CN106848518B CN201710054427.3A CN201710054427A CN106848518B CN 106848518 B CN106848518 B CN 106848518B CN 201710054427 A CN201710054427 A CN 201710054427A CN 106848518 B CN106848518 B CN 106848518B
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- polar plate
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- transmission line
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/08—Microstrips; Strip lines
- H01P3/081—Microstriplines
Abstract
A double-sided double-slot line transmission line relates to a transmission line, which consists of a dielectric substrate (1), an upper left polar plate (11) and an upper right polar plate (12) which are arranged on the dielectric substrate (1), and a lower left polar plate (13) and a lower right polar plate (14) which are arranged on the lower surface of the dielectric substrate (1); an upper gap (31) is arranged between the upper left polar plate (11) and the upper right polar plate (12), and a lower gap (32) is arranged between the lower left polar plate (13) and the lower right polar plate (14); the left metalized via array (21) penetrates through the dielectric substrate (1) to connect the upper left electrode plate (11) and the lower left electrode plate (13), and the right metalized via array (22) penetrates through the dielectric substrate (1) to connect the upper right electrode plate (12) and the lower right electrode plate (14). The transmission line has wide adjustable range of characteristic impedance and phase speed and large power capacity, and can simultaneously meet the requirements of the characteristic impedance and element packaging on the gap distance.
Description
Technical Field
The invention relates to a radio frequency microwave planar transmission line, in particular to a double-sided double-slit slot line transmission line.
Background
The transmission line is the most basic element in radio frequency microwave, and not only can transmit radio frequency microwave signals, but also can form radio frequency microwave components, such as impedance transformers, directional couplers, filters and the like. The slot line is a common planar transmission line and has the advantages of simple structure and wide working frequency range. However, the coupling capacitance at two sides of the slot line gap is provided by the edge capacitance, and the coupling capacitance at the edge is relatively small, so that compared with a microstrip line with relatively large coupling capacitance, the characteristic impedance of the slot line is relatively large, generally more than one hundred ohms, and thus, the use is inconvenient in a system with 50 ohms. In order to maintain the characteristic impedance of the slot line at around 50 ohms, the slot pitch of the slot line is generally narrow. When the gap is narrow, the relative error of the common PCB process is larger, the deviation of the characteristic impedance of the slot line is larger, and the narrow gap causes the reduction of power capacity, so that the slot line is not suitable for occasions with high-power application. On the other hand, it is sometimes necessary for the component to bridge both ends of the slot line, and the component package size of the surface mount is generally customized, so that the situation that the slot pitch required by the component package size is inconsistent with the slot pitch required by the characteristic impedance of the slot line often occurs, and the performance of the system is affected.
Disclosure of Invention
The invention aims to provide a double-sided double-slot line transmission line which is required to have wide adjustable range of characteristic impedance and phase speed and large power capacity and can simultaneously meet the requirements of characteristic impedance and element packaging on slot spacing.
The technical scheme is as follows: the double-sided double-slit slot line transmission line comprises a dielectric substrate, an upper left polar plate, an upper right polar plate, a lower left polar plate and a lower right polar plate, wherein the upper left polar plate, the upper right polar plate, the lower left polar plate and the lower right polar plate are arranged on two sides of the dielectric substrate; an upper left polar plate and an upper right polar plate are arranged on the dielectric substrate, the edges of the upper left polar plate and the upper right polar plate are parallel, and an upper gap is formed between the edges of the upper left polar plate and the upper right polar plate; a lower left polar plate and a lower right polar plate are arranged below the dielectric substrate, the edges of the lower left polar plate and the lower right polar plate are parallel, and a lower gap is formed between the edges of the lower left polar plate and the lower right polar plate; the left metalized via array is parallel to the right metalized via array, the left metalized via array penetrates through the dielectric substrate and is connected with the upper left polar plate and the lower left polar plate, and the right metalized via array penetrates through the dielectric substrate and is connected with the upper right polar plate and the lower right polar plate.
The characteristic impedance of the double-sided double-slit slot line transmission line can be adjusted by changing the upper slit between the edges of the upper left polar plate and the upper right polar plate; the characteristic impedance and phase speed of the double-sided double-slit slot line transmission line can be adjusted by changing the lower slit between the edges of the lower left polar plate and the lower right polar plate.
The characteristic impedance and the phase speed of the double-sided double-slot line transmission line can be adjusted by changing the distance between the left metalized via array and the right metalized via array; the characteristic impedance and the phase speed of the double-sided double-slotted-line transmission line can be adjusted by changing the distance between the adjacent metallized through holes in the left metallized through hole array and the right metallized through hole array.
In the metalized via array, the pitch of adjacent metalized vias is less than one tenth of a wavelength.
The upper left polar plate, the lower left polar plate and the left metallized through hole array are electrically connected and form a left polar plate of the double-sided double-slit slot line transmission line together; the upper right polar plate, the lower right polar plate and the right metallized through hole array are electrically connected and form a right polar plate of the double-sided double-slit slot line transmission line together; the left polar plate and the right polar plate are not electrically connected, so the double-sided double-slit slot line transmission line can transmit signals from direct current to radio frequency microwave.
The characteristic impedance and phase velocity of a transmission line are related to the coupling capacitance between the two plates of the transmission line. The larger the coupling capacitance, the lower the characteristic impedance. The coupling capacitance of the common slot line transmission line is provided only by the fringe capacitance between the slots, and the slot capacitance is relatively small, so that the characteristic impedance of the common slot line is difficult to be small. The coupling capacitor of the double-sided double-slot line transmission line consists of three parts: the edge capacitance of an upper gap between the edges of the upper left polar plate and the upper right polar plate, the edge capacitance of a lower gap between the edges of the lower left polar plate and the lower right polar plate and the capacitance between the two rows of metallized via hole arrays. Therefore, the characteristic impedance of the double-sided double-slot line transmission line can be made smaller or larger, and the adjustable range of the characteristic impedance of the double-sided double-slot line transmission line is wide. And similarly, the adjustable range of the phase speed of the double-sided double-slot line transmission line is wide.
In use, the upper gap distance between the edges of the upper left polar plate and the upper right polar plate can be fixedly changed to meet the requirement of the package size of the bridging element on the gap distance, at this time, the lower gap distance between the edges of the lower left polar plate and the lower right polar plate can be changed, or the distance between the left metallized via array and the right metallized via array can be changed, and the characteristic impedance and the phase velocity of the double-sided double-slotted-slot line transmission line can be adjusted to meet the requirement of a system on the characteristic impedance or the phase velocity.
Has the advantages that: the double-sided double-slot line transmission line has the advantages that the characteristic impedance and phase speed of the transmission line are wide in adjustable range and large in power capacity, and requirements of characteristic impedance and element packaging on slot spacing can be met simultaneously.
Drawings
FIG. 1 is a schematic diagram of a double-sided double-slot transmission line structure.
FIG. 2 is a schematic cross-sectional view of a double-sided double-slotted transmission line structure.
The figure shows that: the dielectric substrate 1, the upper left polar plate 11, the upper right polar plate 12, the lower left polar plate 13, the lower right polar plate 14, the left metalized via array 21, the right metalized via array 22, the upper gap 31 and the lower gap.
Detailed Description
The invention is further illustrated by the following figures and examples.
The embodiment adopted by the invention is as follows: the double-sided double-slot line transmission line comprises a dielectric substrate 1, an upper left polar plate 11, an upper right polar plate 12, a lower left polar plate 13 and a lower right polar plate 14 which are arranged on two sides of the dielectric substrate 1; an upper left polar plate 11 and an upper right polar plate 12 are arranged on the dielectric substrate 1, the edges of the upper left polar plate 11 and the upper right polar plate 12 are parallel, and an upper gap 31 is arranged between the edges of the upper left polar plate 11 and the upper right polar plate 12; a lower left polar plate 13 and a lower right polar plate 14 are arranged below the dielectric substrate 1, the edges of the lower left polar plate 13 and the lower right polar plate 14 are parallel, and a lower gap 32 is arranged between the edges of the lower left polar plate 13 and the lower right polar plate 14; the left metalized via array 21 is parallel to the right metalized via array 22, the left metalized via array 21 passes through the dielectric substrate 1 and connects the upper left electrode plate 11 and the lower left electrode plate 13, and the right metalized via array 22 passes through the dielectric substrate 1 and connects the upper right electrode plate 12 and the lower right electrode plate 14.
The characteristic impedance of the double-sided double-slit slot line transmission line can be adjusted by changing the upper slit 31 between the edges of the upper left polar plate 11 and the upper right polar plate 12; the characteristic impedance and phase speed of the double-sided double-slot line transmission line can be adjusted by changing the lower gap 32 between the edges of the lower left plate 13 and the lower right plate 14.
The characteristic impedance and phase speed of the double-sided double-slot line transmission line can be adjusted by changing the distance between the left metalized via array 21 and the right metalized via array 22; the characteristic impedance and phase speed of the double-sided double-slotted-line transmission line can be adjusted by changing the distance between adjacent metallized through holes in the left metallized through hole array 21 and the right metallized through hole array 22.
In the left metalized via array 21 and the right metalized via array 22, the pitch of the adjacent metalized vias is less than one tenth of a wavelength.
The upper left polar plate 11, the lower left polar plate 13 and the left metallized via array 21 are electrically connected to form a left polar plate of the double-sided double-slit slot line transmission line; the upper right plate 12, the lower right plate 14 and the right metalized via array 22 are electrically connected to form a right plate of the double-sided double-slit slot line transmission line; the left polar plate and the right polar plate are not electrically connected, so the double-sided double-slit slot line transmission line can transmit signals from direct current to radio frequency microwave.
The characteristic impedance and phase velocity of a transmission line are related to the coupling capacitance between the two plates of the transmission line. The larger the coupling capacitance, the lower the characteristic impedance. The coupling capacitance of the common slot line transmission line is provided only by the fringe capacitance between the slots, and the slot capacitance is relatively small, so that the characteristic impedance of the common slot line is difficult to be small. The coupling capacitor of the double-sided double-slot line transmission line consists of three parts: the fringe capacitance of the upper gap 31 between the edges of the upper left plate 11 and the upper right plate 12, the fringe capacitance of the lower gap 32 between the edges of the lower left plate 13 and the lower right plate 14, and the capacitance between the left metalized via array 21 and the right metalized via array 22. Therefore, the characteristic impedance of the double-sided double-slot line transmission line can be made smaller or larger, and the adjustable range of the characteristic impedance of the double-sided double-slot line transmission line is wide. And similarly, the adjustable range of the phase speed of the double-sided double-slot line transmission line is wide.
In use, the distance between the upper gap 31 between the edges of the upper left plate 11 and the upper right plate 12 can be fixedly changed to meet the requirement of the package size of the bridging element on the distance, at this time, the distance between the lower gap 32 between the edges of the lower left plate 13 and the lower right plate 14 can be changed, or the distance between the left metalized via array 21 and the right metalized via array 22 can be changed, and the characteristic impedance and the phase velocity of the double-sided double-slot-line transmission line can be adjusted to meet the requirement of a system on the characteristic impedance or the phase velocity.
In terms of process, the double-sided double-slot line transmission line can be realized by adopting a common Printed Circuit Board (PCB) process, a low temperature co-fired ceramic (LTCC) process or integrated circuit processes such as CMOS (complementary metal oxide semiconductor), Si (silicon) substrates and the like. The left metalized via array 21 and the right metalized via array 22 may be hollow metal vias or solid metal vias, and the shape of the metal vias may be circular, square or other shapes.
The present invention can be realized in light of the above.
Claims (2)
1. A double-sided double-slot line transmission line is characterized by comprising a dielectric substrate (1), an upper left polar plate (11), an upper right polar plate (12), a lower left polar plate (13) and a lower right polar plate (14) which are arranged on two sides of the dielectric substrate (1); an upper left polar plate (11) and an upper right polar plate (12) are arranged on the dielectric substrate (1), the edges of the upper left polar plate (11) and the upper right polar plate (12) are parallel, and an upper gap (31) is arranged between the edges of the upper left polar plate (11) and the upper right polar plate (12); a lower left polar plate (13) and a lower right polar plate (14) are arranged below the dielectric substrate (1), the edges of the lower left polar plate (13) and the lower right polar plate (14) are parallel, and a lower gap (32) is arranged between the edges of the lower left polar plate (13) and the lower right polar plate (14); the left metalized via array (21) is parallel to the right metalized via array (22), the left metalized via array (21) penetrates through the dielectric substrate (1) to connect the upper left polar plate (11) and the lower left polar plate (13), the right metalized via array (22) penetrates through the dielectric substrate (1) to connect the upper right polar plate (12) and the lower right polar plate (14), and the left metalized via array (21) and the right metalized via array (22) are arranged at the edges of two sides close to the upper gap and the lower gap;
the width of the upper gap (31) and the width of the lower gap (32) are respectively determined according to the requirements of component packaging and slot line impedance;
the characteristic impedance of the double-sided double-slit slot line transmission line can be adjusted by changing the upper slit (31) between the edges of the upper left polar plate (11) and the upper right polar plate (12); the characteristic impedance and the phase speed of the double-sided double-slit slot line transmission line can be adjusted by changing the lower slit (32) between the edges of the lower left polar plate (13) and the lower right polar plate (14);
the distance of an upper gap (31) between the edges of the upper left polar plate (11) and the upper right polar plate (12) is changed to meet the requirement of the package size of the bridging element on the distance, and at the moment, the distance of a lower gap (32) between the edges of the lower left polar plate (13) and the lower right polar plate (14) is changed, or the distance between the left metalized via array (21) and the right metalized via array (22) is changed to meet the requirement of a system on characteristic impedance or phase speed.
2. A double-sided double-slot line transmission line according to claim 1, wherein the characteristic impedance and phase velocity of the double-sided double-slot line transmission line can be adjusted by changing the distance between the left metalized via array (21) and the right metalized via array (22); the characteristic impedance and the phase speed of the double-sided double-slit slot line transmission line can be adjusted by changing the distance between the adjacent metallized through holes in the left metallized through hole array (21) and the right metallized through hole array (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710054427.3A CN106848518B (en) | 2017-01-24 | 2017-01-24 | Double-sided double-slot line transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710054427.3A CN106848518B (en) | 2017-01-24 | 2017-01-24 | Double-sided double-slot line transmission line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106848518A CN106848518A (en) | 2017-06-13 |
| CN106848518B true CN106848518B (en) | 2020-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710054427.3A Active CN106848518B (en) | 2017-01-24 | 2017-01-24 | Double-sided double-slot line transmission line |
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| CN (1) | CN106848518B (en) |
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2017
- 2017-01-24 CN CN201710054427.3A patent/CN106848518B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| "Postwall Slotline and Its Application in Design of Short-Pulse Tapered Slot Antennas";Shunli Li等;《IEEE Transactions on Antennas and Propagation》;20150831;第63卷(第8期);参见正文第1-10页，图1、2 * |
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| CN106848518A (en) | 2017-06-13 |
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