CN215418545U - Vertical transition structure for converting microstrip into waveguide - Google Patents
Vertical transition structure for converting microstrip into waveguide Download PDFInfo
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- CN215418545U CN215418545U CN202121938616.5U CN202121938616U CN215418545U CN 215418545 U CN215418545 U CN 215418545U CN 202121938616 U CN202121938616 U CN 202121938616U CN 215418545 U CN215418545 U CN 215418545U
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Abstract
The utility model provides a vertical transition structure for converting a microstrip into a waveguide, which comprises: the dielectric substrate is provided with a first microstrip line and a microstrip impedance transformation line in sequence along the length direction of the dielectric substrate on one side of the front surface of the dielectric substrate, the first microstrip line is connected with the microstrip impedance transformation line, and a gap is arranged between the two sides of the first microstrip line and the microstrip impedance transformation line and a ground layer on the front surface of the dielectric substrate; the main antenna unit and the parasitic antenna unit are sequentially distributed on the front surface of the dielectric substrate from the microstrip impedance transformation line to the other side direction of the dielectric substrate; the main antenna unit and the parasitic antenna unit are rectangular patch antennas; the main antenna unit is connected with the micro-strip impedance transformation line through a second micro-strip line, and a gap is formed between the parasitic antenna unit and the main antenna unit; gaps are arranged between the peripheries of the main antenna unit and the parasitic antenna unit and the grounding layer on the front surface of the dielectric substrate; the rectangular waveguide covers the main antenna unit and the parasitic antenna unit; the utility model realizes the vertical transition structure from the microstrip to the narrow side feed-in of the rectangular waveguide, and has compact structure.
Description
Technical Field
The utility model relates to vertical transition from a microwave/millimeter wave microstrip line to a rectangular waveguide, and belongs to the technical field of microwave/millimeter wave communication.
Background
In some special application occasions in the microwave field, the microstrip line and the rectangular waveguide are required to be used for signal transmission at the same time, but the microstrip line and the rectangular waveguide have obvious difference in appearance and transmission characteristics and cannot be simply connected, so that the design of a microstrip-rectangular waveguide transition structure with excellent performance is very necessary. The prior microstrip-to-waveguide structure comprises a ridge waveguide type, a probe insertion type and a hole/slot coupling type. In consideration of the processing difficulty and precision, most designs adopt a mode of feeding from a wide edge. The disadvantage of broadside feed is that the occupied area is larger than the narrow side, which is not favorable for the structural arrangement condition of compact structure and large number of channels. The narrow-edge feeding mode generally adopts a central side offset or differential microstrip line feeding mode. The offset feed of the narrow side center is limited by high waveguide processing difficulty (not suitable for batch production), and the differential microstrip line feed is suitable for differential signals which come out from the chip, and is not suitable for a single-ended signal circuit.
Disclosure of Invention
Aiming at the defects in the prior art, the embodiment of the utility model provides a vertical transition structure for converting a microstrip into a waveguide, which realizes the vertical transition structure from the microstrip to the narrow edge feed-in of a rectangular waveguide, and has the advantages of compact structure and low processing difficulty. In order to achieve the technical purpose, the embodiment of the utility model adopts the technical scheme that:
the embodiment of the utility model provides a vertical transition structure for converting a microstrip into a waveguide, which comprises: the antenna comprises a dielectric substrate, a first microstrip line, a microstrip impedance transformation line, a rectangular waveguide, a main antenna unit, a parasitic antenna unit, a via hole and a ground layer;
the front surface and the back surface of the medium substrate are both distributed with grounding layers; a first microstrip line and a microstrip impedance transformation line are sequentially arranged on one side of the front surface of the dielectric substrate along the length direction of the dielectric substrate, the first microstrip line is connected with the microstrip impedance transformation line, and a gap is formed between the two sides of the first microstrip line and the microstrip impedance transformation line and a ground layer on the front surface of the dielectric substrate;
the main antenna unit and the parasitic antenna unit are sequentially distributed on the front surface of the dielectric substrate from the microstrip impedance transformation line to the other side direction of the dielectric substrate; the main antenna unit and the parasitic antenna unit are rectangular patch antennas; the main antenna unit is connected with the micro-strip impedance transformation line through a second micro-strip line, and a gap is formed between the parasitic antenna unit and the main antenna unit; gaps are arranged between the peripheries of the main antenna unit and the parasitic antenna unit and the grounding layer on the front surface of the dielectric substrate;
on the dielectric substrate, a plurality of via holes are arranged around the peripheries of the first microstrip line, the microstrip impedance transformation line, the main antenna unit and the parasitic antenna unit; the via hole is communicated with the grounding layers on the front surface and the back surface of the dielectric substrate;
the rectangular waveguide is arranged on the front surface of the dielectric substrate and is connected with the grounding layer on the front surface of the dielectric substrate; the rectangular waveguide covers the main antenna unit and the parasitic antenna unit; the length direction of the rectangular waveguide is consistent with the length direction of the dielectric substrate; a channel is arranged at the narrow side of one side of the rectangular waveguide for the microstrip impedance transformation line to pass through.
Preferably, the lower edge of the rectangular waveguide presses on the via holes arranged at the periphery of the main antenna element and the parasitic antenna element.
Preferably, the first microstrip line and the microstrip impedance transformation line are located at the center in the width direction of the rectangular dielectric substrate.
Preferably, at least one corner of the main antenna element is cut away.
Preferably, a pair of opposite corners of the main antenna element are cut away.
Specifically, the first microstrip line is a 50 ohm microstrip line.
The technical scheme provided by the embodiment of the utility model has the following beneficial effects:
1) the narrow side of the rectangular waveguide is usually small in size, and the machining difficulty of the waveguide can be reduced by adopting a center line feed-in mode.
2) The microstrip waveguide structure has the advantages of small occupied area of a circuit board and compact structure, and is particularly suitable for design of a multichannel microstrip waveguide structure.
3) The parasitic antenna element may serve to expand the bandwidth.
Drawings
Fig. 1 is a schematic structural diagram in an embodiment of the present invention.
FIG. 2 is a diagram of S parameters of signals in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
As shown in fig. 1, a vertical transition structure of a microstrip-to-waveguide proposed by an embodiment of the present invention includes: the antenna comprises a dielectric substrate 1, a first microstrip line 2, a microstrip impedance transformation line 3, a rectangular waveguide 4, a main antenna unit 5, a parasitic antenna unit 6, a via hole 7 and a ground layer 8;
the front surface and the back surface of the medium substrate 1 are distributed with grounding layers 8; a first microstrip line 2 and a microstrip impedance transformation line 3 are sequentially arranged on one side of the front surface of the dielectric substrate 1 along the length direction of the dielectric substrate 1, the first microstrip line 2 is connected with the microstrip impedance transformation line 3, and a gap is arranged between the two sides of the first microstrip line 2 and the microstrip impedance transformation line 3 and a ground layer 8 on the front surface of the dielectric substrate 1;
a main antenna unit 5 and a parasitic antenna unit 6 are sequentially arranged on the front surface of the dielectric substrate 1 from the microstrip impedance transformation line 3 to the other side direction of the dielectric substrate 1; the main antenna unit 5 and the parasitic antenna unit 6 are both rectangular patch antennas; the main antenna unit 5 is connected with the microstrip impedance transformation line 3 through a second microstrip line 9, and a gap is formed between the parasitic antenna unit 6 and the main antenna unit 5; a gap is arranged between the peripheries of the main antenna unit 5 and the parasitic antenna unit 6 and the grounding layer 8 on the front surface of the medium substrate 1;
on the dielectric substrate 1, a plurality of via holes 7 are arranged around the peripheries of the first microstrip line 2, the microstrip impedance transformation line 3, the main antenna unit 5 and the parasitic antenna unit 6 to prevent or reduce signal leakage; the via holes 7 are communicated with the grounding layers 8 on the front surface and the back surface of the dielectric substrate 1;
the rectangular waveguide 4 is arranged on the front surface of the dielectric substrate 1 and is connected with a grounding layer 8 on the front surface of the dielectric substrate 1; the rectangular waveguide 4 houses therein a main antenna element 5 and a parasitic antenna element 6; the length direction of the rectangular waveguide 4 is consistent with the length direction of the dielectric substrate 1; a channel is arranged at the narrow side of one side of the rectangular waveguide 4 for the microstrip impedance transformation line 3 to pass through;
preferably, the lower edge of the rectangular waveguide 4 presses on the via holes 7 arranged on the periphery of the main antenna unit 5 and the parasitic antenna unit 6; the signal in the rectangular waveguide 4 can be effectively prevented from leaking;
in the vertical transition structure of the microstrip-to-waveguide introduced above, the modes of the first microstrip line, the rectangular patch antenna and the rectangular waveguide are a quasi-TEM transmission mode, a TM fundamental wave resonance mode and a TE fundamental wave transmission mode, respectively; the quasi-TEM transmission mode and the TE fundamental wave transmission mode can be efficiently exchanged by using the TM fundamental wave resonance mode of the rectangular patch antenna, so that low-loss transmission of signals is realized; the main antenna unit and the parasitic antenna unit are coupled through a gap to generate a resonance point, so that the signal transmission bandwidth can be expanded;
preferably, the first microstrip line 2 and the microstrip impedance transformation line 3 are located at the center in the width direction of the rectangular dielectric substrate 1; the central line feed-in mode is adopted to reduce the waveguide processing difficulty;
preferably, at least one corner of the main antenna unit 5 is cut off, and mode conversion from a microstrip to a waveguide can be realized by performing corner cutting processing on the main antenna unit 5; optimally, a pair of opposite corners of the main antenna element 5 is cut away;
the first microstrip line 2 can adopt a 50 ohm microstrip line; the main antenna unit 5 is well matched with the 50-ohm first microstrip line 2 through the microstrip impedance transformation line 3;
FIG. 2 is a graph of S parameters of a signal with frequency (GHz) and loss (dB) plotted on the abscissa and the ordinate, respectively, and from the graphical results, the bandwidth with return loss ≦ -15dB is about 6.15GHz, indicating that the signal has a wide operating bandwidth. The insertion loss value at 74.5-80.6GHz is less than 0.6dB, which indicates that the signal transmission loss is small.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (6)
1. A vertical transition structure of microstrip to waveguide, comprising: the antenna comprises a dielectric substrate (1), a first microstrip line (2), a microstrip impedance transformation line (3), a rectangular waveguide (4), a main antenna unit (5), a parasitic antenna unit (6), a via hole (7) and a ground layer (8);
the front surface and the back surface of the medium substrate (1) are distributed with grounding layers (8); a first microstrip line (2) and a microstrip impedance transformation line (3) are sequentially arranged on one side of the front face of the dielectric substrate (1) along the length direction of the dielectric substrate (1), the first microstrip line (2) is connected with the microstrip impedance transformation line (3), and a gap is formed between the two sides of the first microstrip line (2) and the microstrip impedance transformation line (3) and a ground layer (8) on the front face of the dielectric substrate (1);
a main antenna unit (5) and a parasitic antenna unit (6) are sequentially arranged on the front surface of the dielectric substrate (1) from the microstrip impedance transformation line (3) to the other side direction of the dielectric substrate (1); the main antenna unit (5) and the parasitic antenna unit (6) are both rectangular patch antennas; the main antenna unit (5) is connected with the microstrip impedance transformation line (3) through a second microstrip line (9), and a gap is arranged between the parasitic antenna unit (6) and the main antenna unit (5); gaps are arranged between the peripheries of the main antenna unit (5) and the parasitic antenna unit (6) and the grounding layer (8) on the front surface of the dielectric substrate (1);
on the dielectric substrate (1), a plurality of through holes (7) are arranged around the peripheries of the first microstrip line (2), the microstrip impedance transformation line (3), the main antenna unit (5) and the parasitic antenna unit (6); the via hole (7) is communicated with the grounding layer (8) on the front surface and the back surface of the dielectric substrate (1);
the rectangular waveguide (4) is arranged on the front surface of the dielectric substrate (1) and is connected with a grounding layer (8) on the front surface of the dielectric substrate (1); the rectangular waveguide (4) covers the main antenna unit (5) and the parasitic antenna unit (6) therein; the length direction of the rectangular waveguide (4) is consistent with the length direction of the dielectric substrate (1); a channel is arranged at the narrow side of one side of the rectangular waveguide (4) for the micro-strip impedance transformation line (3) to pass through.
2. The microstrip to waveguide vertical transition structure of claim 1,
the lower edge of the rectangular waveguide (4) is pressed on the via holes (7) arranged on the periphery of the main antenna unit (5) and the parasitic antenna unit (6).
3. The microstrip to waveguide vertical transition structure of claim 1,
the first microstrip line (2) and the microstrip impedance transformation line (3) are positioned at the center of the rectangular dielectric substrate (1) in the width direction.
4. The microstrip to waveguide vertical transition structure of claim 1,
at least one corner of the main antenna element (5) is cut away.
5. The microstrip to waveguide vertical transition structure of claim 4,
a pair of opposite corners of the main antenna element (5) is cut off.
6. The microstrip to waveguide vertical transition structure of claim 1,
the first microstrip line (2) is a 50 ohm microstrip line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121938616.5U CN215418545U (en) | 2021-08-18 | 2021-08-18 | Vertical transition structure for converting microstrip into waveguide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121938616.5U CN215418545U (en) | 2021-08-18 | 2021-08-18 | Vertical transition structure for converting microstrip into waveguide |
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| Publication Number | Publication Date |
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| CN215418545U true CN215418545U (en) | 2022-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121938616.5U Active CN215418545U (en) | 2021-08-18 | 2021-08-18 | Vertical transition structure for converting microstrip into waveguide |
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| CN (1) | CN215418545U (en) |
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2021
- 2021-08-18 CN CN202121938616.5U patent/CN215418545U/en active Active
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