CN109830790B - Totally-enclosed coplanar integrated waveguide-to-strip line transition device - Google Patents
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Abstract
The invention provides a totally-enclosed coplanar integrated waveguide-to-stripline transition device, which comprises a first metal layer, a first dielectric substrate, a second metal layer, a second dielectric substrate, a third metal layer, a coplanar integrated waveguide structure, a mode conversion structure, an impedance matching line, a stripline and an SMA joint which are sequentially stacked; and a cavity is arranged on the first dielectric substrate, an inner core of the SMA joint penetrates through the second dielectric substrate and then is welded with the coplanar integrated waveguide structure in the cavity, and the upper surface of the cavity is covered by a metal sheet to form a closed coplanar waveguide integrated structure. The coplanar integrated waveguide structure is completely sealed by metal and adopts the SMA connector for feeding, and simultaneously, a corresponding coplanar waveguide to strip line transmission line structure is formed, so that the transverse tight arrangement of a plurality of strip lines becomes possible; the invention is suitable for the structure which needs to use SMA for feeding and a plurality of the structures need to be transversely and densely arranged, and simultaneously has the advantages of smaller occupied area and low insertion loss.
Description
Technical Field
The invention relates to the technical field of microwaves, in particular to a transition device from a totally-enclosed coplanar integrated waveguide to a strip line.
Background
The strip line is a transmission line formed by two grounding metal strips and a middle rectangular section conductor strip with width omega and thickness t, the upper part and the lower part of a signal line in the strip line are shielded by metal ground, so that the transmission structure has lower insertion loss in millimeter waves and submillimeter waves, and the strip line structure needs to design a transition structure for feeding in an actual device due to shielding of the metal ground.
The two sides of the coplanar integrated waveguide structure are both the ground, so that when signals are transmitted between the coplanar integrated waveguide structure and the coplanar integrated waveguide structure, the mode is a TEM mode, and the coplanar integrated waveguide structure also has the advantage of low insertion loss in millimeter wave and submillimeter wave frequency bands; meanwhile, only two sides of the structure are ground, so that the structure is convenient to combine with the SMA head to feed.
The two transmission structures are combined, so that on one hand, actual feeding is facilitated, on the other hand, design of devices is facilitated, and the method is a feasible design method of millimeter wave and sub-millimeter wave devices. A number of documents have been introduced to the transitional interconnection between these two transmission structures.
In the existing structure, the two side grounds of most coplanar integrated waveguides are also the upper surface grounds of the strip line structure. The design method enables the lower surface of the previous strip line structure to be in contact with the coplanar waveguide structure signal line in the next strip line structure when a plurality of strip line structures are required to be transversely and tightly arranged, and the feeding failure is caused.
Accordingly, there are deficiencies in the art and a need for improvement.
Disclosure of Invention
The embodiment of the invention aims to provide a totally-enclosed coplanar integrated waveguide-to-stripline transition device, which solves the problem that a plurality of stripline feed structures cannot be transversely and tightly arranged in the prior art.
The invention provides a totally-enclosed coplanar integrated waveguide-to-stripline transition device, which comprises: sequentially stacking a first metal layer, a first dielectric substrate, a second metal layer, a second dielectric substrate, a third metal layer, a coplanar integrated waveguide structure, a mode conversion structure connected with the coplanar integrated waveguide structure, an impedance matching line connected with the mode conversion structure, a strip line connected with the impedance matching line and an SMA joint; wherein the coplanar integrated waveguide structure, the mode conversion structure, the impedance match line and the strip line are all disposed on the second metal layer; and a cavity is arranged on the first dielectric substrate, an inner core of the SMA joint penetrates through the second dielectric substrate and then is welded with the coplanar integrated waveguide structure in the cavity, and the upper surface of the cavity is covered by a metal sheet to form a closed coplanar waveguide integrated structure.
Furthermore, the second metal layer is provided with a first rectangular gap and a second rectangular gap communicated with the first rectangular gap, the second rectangular gap is gradually opened according to the outer edge of the quarter circle, one end of the first rectangular gap is closed to form a closed end, and the other end of the first rectangular gap is gradually opened according to the outer edge of the quarter circle to form an open end; the equivalent ground part of the coplanar integrated waveguide structure comprises a first gap and a first signal wire positioned at the closed end of the first gap; the equivalent ground portion of the mode conversion structure includes a second slot and a second signal line located within the second slot.
Further, the impedance matching line and the strip line are both positioned outside the first gap and the second gap; the first signal line is connected with a second signal line, and the second signal line is connected with an impedance matching line; the first signal line, the second signal line, the impedance matching line and the strip line 7 are connected in sequence to form a transmission line structure from the coplanar waveguide to the strip line.
Further, the cavity is located above the first slit.
Further, the first signal line is completely enclosed between the metal foil and the second dielectric substrate.
Further, the second metal layer is provided with a plurality of first metalized through holes only penetrating through the second medium substrate layer around the first gap.
Furthermore, the second metal layer is provided with a plurality of second metalized through holes penetrating through the first dielectric substrate and the second dielectric substrate at the periphery of the first metalized through hole.
Furthermore, a plurality of third metalized through holes penetrating through the first dielectric substrate and the second dielectric substrate are formed in the second metal layer around the second gap.
Furthermore, a plurality of grounding metalized through holes corresponding to the metalized through holes are formed in the first dielectric substrate layer and the second dielectric substrate layer.
When a plurality of strip line structures are required to be transversely and tightly arranged, the lower surface of the upper strip line structure in the traditional design can be contacted with the signal line of the coplanar waveguide structure in the lower strip line structure, so that the feed failure is caused; the coplanar integrated waveguide structure is completely sealed by metal and fed from the bottom by adopting the inner core of the SMA joint, and simultaneously, a corresponding transmission line structure from the coplanar waveguide to the strip line is formed, so that the transverse and compact arrangement of a plurality of strip lines becomes possible; the invention is suitable for the structure which needs to use SMA for feeding and a plurality of the structures need to be transversely and densely arranged, and simultaneously has the advantages of smaller occupied area and low insertion loss.
Drawings
FIG. 1 is a schematic three-dimensional overall structure diagram of a totally-enclosed coplanar integrated waveguide-to-stripline transition device in a preferred embodiment of the present invention;
FIG. 2 is a top view of the fully enclosed coplanar integrated waveguide to stripline transition block shown in FIG. 1;
fig. 3 is a diagram showing simulation results of S-parameters of the transition device from the totally-enclosed coplanar integrated waveguide to the strip line shown in fig. 1.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention discloses a totally-enclosed coplanar integrated waveguide-to-stripline transition device, which is realized by SMA feed.
Fig. 1 is a schematic structural diagram of the totally-enclosed coplanar integrated waveguide-to-stripline transition device, and fig. 2 is a top view of the totally-enclosed coplanar integrated waveguide-to-stripline transition device, which is matched with fig. 1 for convenient understanding.
The totally-enclosed coplanar integrated waveguide-to-stripline transition device comprises: a first metal layer 1, a first dielectric substrate 2, a second metal layer 3, a second dielectric substrate 4, and a third metal layer 5 are stacked in this order.
The totally-enclosed coplanar integrated waveguide-to-strip line transition device further comprises a coplanar integrated waveguide structure arranged on the second metal layer 3, a mode conversion structure connected with the coplanar integrated waveguide structure, an impedance matching line 8 connected with the mode conversion structure, and a strip line 7 connected with the impedance matching line 8.
The second metal layer 3 is provided with a first rectangular gap 31 and a second rectangular gap 32 communicated with the first gap 31, the second gap 32 is gradually opened according to the outer edge of a quarter circle, one end of the first gap 31 is closed and forms a closed end, and the other end of the first gap 31 is gradually opened according to the outer edge of the quarter circle and forms an opened end.
The equivalent ground portion of the coplanar integrated waveguide structure comprises a first slot 31 and a first signal line 6 located at the closed end of the first slot 31; the equivalent ground portion of the mode converting structure includes a second slot 32 and a second signal line 16 located within the second slot 32. The impedance matching line 8 and the strip line 7 are both located outside the first slit 31 and the second slit 32.
The first signal line 6 of the coplanar integrated waveguide structure is directly connected with the second signal line 16 in the mode conversion structure, the second signal line 16 is connected with the impedance matching line 8, the impedance matching line 8 is connected with the strip line 7, and the first signal line 6, the second signal line 16, the impedance matching line 8 and the strip line 7 are sequentially connected to form a transmission line structure from the coplanar waveguide to the strip line.
The characteristic impedance of the coplanar integrated waveguide structure is 50 ohms. The length of the impedance match line 8 is about a quarter of the wavelength of the operating frequency medium.
The first dielectric substrate 2 is provided with a cavity 12, the cavity 12 is located above the first slot 31 of the second metal layer 3, and the cavity 12 and the first signal line 6 of the coplanar integrated waveguide structure are symmetrically arranged.
After the inner core 14 of the SMA joint 13 passes through the second dielectric substrate 4 and is welded with the first signal wire 6 in the cavity 12, the upper surface of the cavity 12 will be covered by the metal foil 15, thereby completely enclosing the first signal wire 6 and forming the coplanar waveguide integrated mechanism, i.e. the first signal wire 6 is completely enclosed between the metal foil 15 and the second dielectric substrate 4.
The first dielectric substrate 2 and the second dielectric substrate 4 are both made of Roger 5880, and the thicknesses of the first dielectric substrate 2 and the second dielectric substrate 4 are both 45-55 mils, preferably 50 mils.
The second metal layer 3 is provided with a plurality of first metalized through holes 11 only penetrating through the second medium substrate layer 4 around the first gap 31; the second metal layer 3 is also provided with a plurality of second metalized through holes 10 penetrating through the first dielectric substrate 2 and the second dielectric substrate 4 at the periphery of the first metalized through hole 11; the second metal layer 3 is also provided with a plurality of third metallized through holes 9 passing through the first dielectric substrate 2 and the second dielectric substrate 4 around the second gap 32.
A plurality of ground metallization vias corresponding to the first metallization via 11, the second metallization via 10 and the third metallization via 9, respectively, are provided in the first dielectric substrate layer 2 and the second dielectric substrate layer 4.
FIG. 3 is S parameter simulation results of the transition device from the totally-enclosed coplanar integrated waveguide to the strip line, and it can be seen that the insertion loss of the transition device is less than 0.4dB, the return loss is better than-15 dB and the performance is very good in the working frequency band from 8GHz to 18 GHz.
When a plurality of strip line structures are required to be transversely and tightly arranged, the lower surface of the upper strip line structure in the traditional design can be contacted with the signal line of the coplanar waveguide structure in the lower strip line structure, so that the feed failure is caused; the coplanar integrated waveguide structure is completely sealed by metal, the inner core 14 of the SMA joint 13 is adopted for feeding from the bottom, and meanwhile, the corresponding coplanar waveguide to strip line transmission line structure is formed, so that the transverse tight arrangement of a plurality of strip lines becomes possible.
It is understood that the above-mentioned various size parameters are only one optimized setting in the present embodiment, and it should not be taken as a reason for limiting the scope of the present invention, and the various size parameters can be optimally configured according to actual situations.
The invention is suitable for a structure which needs to use SMA for feeding and a plurality of transition devices need to be transversely and densely arranged, and simultaneously has the advantages of smaller occupied area and low insertion loss.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A totally-enclosed coplanar integrated waveguide-to-stripline transition device, comprising: the device comprises a first metal layer, a first dielectric substrate, a second metal layer, a second dielectric substrate, a third metal layer, a coplanar integrated waveguide structure, a mode conversion structure connected with the coplanar integrated waveguide structure, an impedance matching line connected with the mode conversion structure, a strip line connected with the impedance matching line and an SMA joint; the first metal layer, the first dielectric substrate, the second metal layer, the second dielectric substrate and the third metal layer are sequentially stacked; the coplanar integrated waveguide structure, the mode conversion structure, the impedance matching line and the strip line are all arranged on the second metal layer; the first dielectric substrate is provided with a cavity, an inner core of the SMA joint penetrates through the second dielectric substrate and then is welded with the coplanar integrated waveguide structure in the cavity, and the upper surface of the cavity is covered by a metal sheet to form a closed coplanar waveguide integrated structure; the second metal layer is provided with a rectangular first gap and a second gap communicated with the first gap, one end of the first gap is closed and forms a closed end, the other end of the first gap is connected with one end of the second gap, and the other end of the second gap is gradually opened according to the outer edge of a quarter circle and forms an opening end; the coplanar integrated waveguide structure comprises a first slot and a first signal line positioned at the closed end of the first slot; the mode conversion structure comprises a second gap and a second signal line positioned in the second gap; the impedance matching line and the strip line are both positioned outside the first gap and the second gap; the first signal line is connected with a second signal line, and the second signal line is connected with an impedance matching line; the first signal line, the second signal line, the impedance matching line and the strip line are sequentially connected to form a transmission line structure from the coplanar waveguide to the strip line; the cavity is positioned above the first gap;
the first signal line is completely enclosed between the metal sheet and the second dielectric substrate; a plurality of first metalized through holes only penetrating through the second medium substrate layer are formed in the second metal layer around the first gap; the second metal layer is provided with a plurality of second metalized through holes penetrating through the first dielectric substrate and the second dielectric substrate at the periphery of the first metalized through hole; and a plurality of third metalized through holes which penetrate through the first dielectric substrate and the second dielectric substrate are arranged around the second gap on the second metal layer.
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| CN201910179819.1A CN109830790B (en) | 2019-03-11 | 2019-03-11 | Totally-enclosed coplanar integrated waveguide-to-strip line transition device |
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| CN201910179819.1A CN109830790B (en) | 2019-03-11 | 2019-03-11 | Totally-enclosed coplanar integrated waveguide-to-strip line transition device |
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| CN109830790B true CN109830790B (en) | 2020-09-08 |
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| CN111628745B (en) * | 2020-05-29 | 2021-04-16 | 诺思(天津)微系统有限责任公司 | Signal transmission line, duplexer, multiplexer, and communication apparatus |
| CN113346213B (en) * | 2021-06-30 | 2022-02-08 | 上海交通大学 | Gradual change switching structure from strip line to coplanar waveguide |
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| US7446712B2 (en) * | 2005-12-21 | 2008-11-04 | The Regents Of The University Of California | Composite right/left-handed transmission line based compact resonant antenna for RF module integration |
| JP5467851B2 (en) * | 2009-12-07 | 2014-04-09 | 日本無線株式会社 | Microstrip line-waveguide converter |
| JP5519328B2 (en) * | 2010-02-26 | 2014-06-11 | 日鉄住金エレクトロデバイス株式会社 | High-frequency transmission line substrate |
| CN106025464B (en) * | 2016-06-03 | 2019-02-15 | 电子科技大学 | A kind of substrate integration wave-guide formula cavity body filter |
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