CN108428972B - Transition conversion device from W-band slot waveguide to microstrip - Google Patents
Transition conversion device from W-band slot waveguide to microstrip Download PDFInfo
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- CN108428972B CN108428972B CN201810144666.2A CN201810144666A CN108428972B CN 108428972 B CN108428972 B CN 108428972B CN 201810144666 A CN201810144666 A CN 201810144666A CN 108428972 B CN108428972 B CN 108428972B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
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Abstract
The invention discloses a transition conversion device from a W-band slot waveguide to a microstrip, which comprises a slot waveguide (1), a step matching structure (2), a triangular plane resonator (3) and a 50-ohm microstrip transmission line (4); the step matching structure (2) is positioned between the signal transmission path (5) in the slot waveguide and the triangular planar resonator; the triangular plane resonator is provided with a ground via hole (6); and the 50-ohm microstrip transmission line is connected with the output end of the triangular planar resonator. The transition conversion device realizes signal interconnection from the W-band slot waveguide to the microstrip transmission line, and provides possibility for the integrated design of an antenna and a monolithic integrated circuit MMIC.
Description
Technical Field
The invention belongs to the technical field of electromagnetic fields and microwaves, and particularly relates to novel transition conversion from a W-band slot waveguide to a microstrip.
Background
The W wave band has wide application prospect in the fields of vehicle-mounted radar, point-to-point 5G mobile communication data return, synthetic aperture radar, guide heads and the like. Conventional W-band modules are mostly constructed using machined WR-10 standard waveguides as interconnects. On the one hand, such a machined waveguide module not only requires high machining precision (+/-10 microns), but also has a large volume, which is not favorable for miniaturization and integration. On the other hand, the assembly of the transition of the fin line and the probe for transition conversion of the microstrip and the WR-10 wave band needs special gold wire bonding operation of mature process personnel, and the batch consistency of the product cannot be well guaranteed. These reasons have greatly limited the large-scale application of conventional W-band waveguide systems. The advent of Gap waveguides (Gap waveguides) provides an interconnection solution for millimeter wave modules, thanks to the boundary approximation of ideal magnetic conductors. It has the transmission characteristic similar to that of a waveguide, and the processing precision requirement can be relaxed to +/-50 microns.
The slot waveguide is proposed by a research group of professor p.s.kildal of swedish scientists in 2009, and is firstly applied to the field of microwave circuit module packaging; subsequently, slot waveguides are applied to the field of antennas and circuits, and a series of millimeter antenna arrays, filters, power division and the like are proposed based on the slot waveguides. In addition, the Integrated monolithic microwave Integrated circuit (mmic) to slot waveguide is critical for its practical application; therefore, transition structures from slot waveguides of different bands to microstrip transmission lines are continuously proposed. The working frequency of the transition conversion structure is mainly in four wave bands of Ku, Ka, V and F, and the transition conversion mechanism is respectively based on a defected ground, gradual impedance change, a coupling resonant cavity and a coupling microstrip patch. At present, no transition conversion device from the W-band slot waveguide to the microstrip exists, and a transition conversion structure from the W-band slot waveguide to the microstrip needs to be designed in order to expand the application of the slot waveguide in a W-band module system.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a transition conversion structure from a W-band slot waveguide to a microstrip, which realizes signal interconnection from the W-band slot waveguide to a microstrip transmission line and provides possibility for the integrated design of an antenna and a monolithic integrated circuit (MMIC).
The technical scheme is as follows: the invention adopts the following technical scheme:
a transition conversion device from a W-band slot waveguide to a microstrip comprises a slot waveguide (1), a step matching structure (2), a triangular plane resonator (3) and a 50-ohm microstrip transmission line (4);
the step matching structure (2) is positioned between the signal transmission path (5) in the slot waveguide and the triangular planar resonator; the triangular plane resonator is provided with a ground via hole (6); and the 50-ohm microstrip transmission line is connected with the output end of the triangular planar resonator.
The triangular planar resonator and the 50-ohm microstrip transmission line are integrated on a substrate (7), and the substrate is arranged on a slot waveguide base (8).
The step matching structure comprises at least 3 steps (9); among the plurality of steps, the height increases in order from the step connected to the signal transmission path inside the slot waveguide to the step connected to the triangular planar resonator. Among the plurality of steps, the length of the step positioned in the middle is larger than the lengths of the steps positioned on the two sides.
The slot waveguide is internally provided with periodic metal posts (10), a groove path (11), a base (8) and an upper cover plate (12); the periodic metal posts (10) are arranged on two sides of the groove path (11).
The grounding via hole (6) is formed in one side, connected with the step matching structure (2), of the triangular plane resonator (3).
And a rectangular patch (13) is arranged on one side of the triangular planar resonator (3) connected with the step matching structure (2).
Has the advantages that: the transition conversion device from the W-band slot waveguide to the microstrip provided by the invention can effectively solve the interconnection between the W-band slot waveguide and the monolithic integrated circuit, is beneficial to the application and popularization of the antenna array in the form of the slot waveguide in a W-band system, and can effectively reduce the requirement on the processing precision during the traditional waveguide processing of the frequency band. The transition conversion device is not only suitable for 87GHz-100GHz, but also suitable for transition conversion in a certain frequency band range in other W full frequency band ranges from 75GHz to 100 GHz; the method is not only suitable for the slot waveguide manufactured by machining, but also suitable for the slot waveguide manufactured by other secret machining, such as the slot waveguide manufactured by Micro-Electro-Mechanical System (MEMS).
Compared with the reported transition conversion from other 4 wave band (Ku, Ka, V and F) slot waveguides to a microstrip transmission line, the transition conversion device provided by the invention can conveniently realize the field mode coupling and transition from the W wave band slot waveguide to the microstrip transmission line based on the improved coupling of the planar resonator, is simple to assemble, is beneficial to reducing the cost, completes the millimeter wave transition conversion from the slot waveguide to the planar transmission line, and lays a foundation for the application of the slot waveguide in a W wave band module system.
Drawings
FIG. 1 is a three-dimensional schematic diagram of a transition conversion device from a W-band slot waveguide to a microstrip in an embodiment;
FIG. 2 is a three-dimensional structure diagram of a transition conversion device from a W-band slot waveguide to a microstrip in an embodiment;
FIG. 3 is a top view of the transition conversion device from W-band slot waveguide to microstrip and a labeled diagram of related design parameters in the embodiment;
FIG. 4 is an enlarged three-dimensional schematic diagram of details of a transition conversion device from a W-band slot waveguide to a microstrip and a labeled diagram of related design parameters in an embodiment;
fig. 5 is a graph of simulation results of transition insertion loss and return loss from the W-band slot waveguide to the microstrip in the embodiment.
Detailed Description
The invention is further elucidated with reference to the drawings and the detailed description.
The three-dimensional schematic diagram of the transition conversion device from the W-band slot waveguide to the microstrip designed by the invention is shown in figure 1, and figure 2 is a three-dimensional structure diagram and comprises a slot waveguide 1, a step matching structure 2, a triangular plane resonator 3 and a 50-ohm microstrip transmission line 4; the slot waveguide 1 is composed of a periodic metal column 10, a groove path 11 for signal transmission, a base 8 and an upper cover plate 12, a step matching structure 2 is designed between a signal transmission path 5 and a quartz substrate 7, an improved triangular planar resonator 3 with a grounding via hole 6 and a 50-ohm microstrip transmission line 4 are designed on the quartz substrate 7 together, and the quartz substrate 7 is installed above an extending part on one side of the slot waveguide base 8 through conductive adhesive or solder pieces. And the triangular planar resonator is provided with a ground via hole, so that the resonant frequency and the matching field mode can be adjusted. Further, a rectangular patch 13 is provided on the side of the triangular planar resonator 3 connected to the stepped matching structure 2, so that the resonance mode can be increased.
Fig. 3 is a top view and a related design parameter labeled diagram of a transition conversion device from a W-band slot waveguide to a microstrip according to the present invention, where fig. 3- (a) is a top view, and fig. 3- (b) is a front view of a dashed-line frame in fig. 3- (a). As shown in fig. 3- (a), the length of the transition conversion device from the whole W-band slot waveguide to the microstrip is L, and the width is W; as shown in FIG. 3- (b), the height of the periodic metal posts in the slot waveguide is h1Side length d, period p, distance from the upper cover plate to the root of the metal column h2Therefore, the width of the signal transmission groove path is calculated to be W-3 p-d;
FIG. 4 is a detail enlarged three-dimensional schematic view of a transition conversion device from a W-band slot waveguide to a microstrip and related design parameter marksNote that, in this embodiment, the step matching structure inside the slot waveguide is designed with 3 steps, and the height of each step is h3，h4，h5Corresponding lengths are respectively l1，l2，l3Corresponding widths are respectively a1，a2，a3-a7(ii) a The width of the left rectangular patch of the improved triangular planar resonator is a7Length of l3Middle width of w1Length of a4Right side width is w2Length of a5The radius of the grounding short-circuit via hole in the improved triangular planar resonator is r, and the distance from the grounding short-circuit via hole to the leftmost side of the improved triangular planar resonator is a8(ii) a 50 ohm microstrip line width is w2Length of a6The length of the whole transition conversion device in the transmission direction is L, and the thickness of the quartz substrate is hs。
In this embodiment, the slot waveguide is machined by using rustproof aluminum with a precision of ± 50um, the dielectric constant of the quartz substrate is 3.824, the thickness is 100um, and the corresponding geometric parameters are as follows: d 0.5mm p 1.4mm, h1＝0.3mm,h2＝0.4mm,h3＝0.1mm,h4＝0.2mm,h5＝0.3mm,w1＝0.4mm，w2＝0.21mm，l1＝2.4mm，l2＝5.6mm，l3＝5.3mm，a1＝0.5mm，a2＝0.5mm，a3＝0.85mm，a4＝1.64mm，a5＝0.52mm，a6＝0.4mm，a7＝0.7mm，a8＝0.35mm，r＝0.1mm，L＝11.5mm，W＝9mm。
The lengths of the 3 steps in the step matching structure have the following relationship: l1<l2，l3<l2(ii) a Namely, the length of the step in the middle is larger than that of the steps on the two sides, so that the impedance matching can be optimized and the standing wave can be improved.
FIG. 5 is a simulation result of the present invention, and it can be seen that the insertion loss is less than 2dB in the 87-100GHz frequency range, as shown by curve S21 in FIG. 5; the return loss is mostly better than-20 dB as shown by curve S11 in fig. 5.
Claims (5)
1. A transition conversion device from a W-band slot waveguide to a microstrip is characterized by comprising a slot waveguide (1), a step matching structure (2), a triangular plane resonator (3) and a 50-ohm microstrip transmission line (4);
the step matching structure (2) is positioned between the signal transmission path (5) in the slot waveguide and the triangular planar resonator; the triangular plane resonator is provided with a ground via hole (6); the 50-ohm microstrip transmission line is connected with the output end of the triangular planar resonator;
the grounding via hole (6) is arranged on one side of the triangular plane resonator (3) connected with the step matching structure (2);
and a rectangular patch (13) is arranged on one side of the triangular planar resonator (3) connected with the step matching structure (2).
2. The transition conversion device from the W-band slot waveguide to the microstrip of claim 1, wherein the triangular planar resonator and the 50-ohm microstrip transmission line are integrated on a single substrate (7) mounted on the slot waveguide base (8).
3. The transition conversion device from W-band slot waveguide to microstrip according to claim 1, wherein said step matching structure comprises at least 3 steps (9); among the steps, the height increases in order from the step connected to the signal transmission path inside the slot waveguide to the step connected to the triangular planar resonator.
4. The transition conversion device from the W-band slot waveguide to the microstrip according to claim 1, wherein the slot waveguide is provided with a periodic metal pillar (10), a groove path (11), a base (8) and an upper cover plate (12); the periodic metal posts (10) are arranged on two sides of the groove path (11).
5. The transition conversion device from the W-band slot waveguide to the microstrip of claim 3, wherein the step length in the middle of the steps is longer than the step lengths on both sides.
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| CN201810144666.2A CN108428972B (en) | 2018-02-12 | 2018-02-12 | Transition conversion device from W-band slot waveguide to microstrip |
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| CN201810144666.2A CN108428972B (en) | 2018-02-12 | 2018-02-12 | Transition conversion device from W-band slot waveguide to microstrip |
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| CN108428972B true CN108428972B (en) | 2020-04-07 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104241794A (en) * | 2013-06-09 | 2014-12-24 | 华为技术有限公司 | Combined waveguide |
| CN205016645U (en) * | 2015-10-14 | 2016-02-03 | 无锡华测电子系统有限公司 | Transition structure of millimeter wave band microstrip NOT AND standard waveguide |
| CN205666315U (en) * | 2016-06-06 | 2016-10-26 | 中国电子科技集团公司第三十八研究所 | Be used for W wave band waveguide - microstrip probe converter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104241794A (en) * | 2013-06-09 | 2014-12-24 | 华为技术有限公司 | Combined waveguide |
| CN205016645U (en) * | 2015-10-14 | 2016-02-03 | 无锡华测电子系统有限公司 | Transition structure of millimeter wave band microstrip NOT AND standard waveguide |
| CN205666315U (en) * | 2016-06-06 | 2016-10-26 | 中国电子科技集团公司第三十八研究所 | Be used for W wave band waveguide - microstrip probe converter |
Non-Patent Citations (1)
| Title |
|---|
| "Novel Millimeter Wave Transition From Microstrip Line to Groove Gap Waveguide for MMIC Packaging and Antenna Integration";Uttam Nandi 等;《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》;20170807;第27卷(第8期);第691-693页 * |
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