CN102142616A - Low profile cavity backed integrated antenna with widened frequency band - Google Patents
Low profile cavity backed integrated antenna with widened frequency band Download PDFInfo
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- CN102142616A CN102142616A CN2011100242261A CN201110024226A CN102142616A CN 102142616 A CN102142616 A CN 102142616A CN 2011100242261 A CN2011100242261 A CN 2011100242261A CN 201110024226 A CN201110024226 A CN 201110024226A CN 102142616 A CN102142616 A CN 102142616A
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Abstract
The invention relates to a low profile cavity backed integrated antenna with a widened frequency band. A metal backed cavity of the traditional antenna has a large volume and high processing cost and is difficult to process. The low profile cavity backed integrated antenna with the widened frequency band comprises a dielectric substrate, an upper metal layer which is coated on the upper surface of the dielectric substrate, and a lower metal layer which is coated on the lower surface of the dielectric substrate. A plurality of electric interconnection units which pass through the upper metal layer, the dielectric substrate and the lower metal layer are arranged in sequence to form an electric interconnection array; an area which is surrounded by the upper metal layer, the lower metal layer and the electric interconnection array forms a cavity body; a feed unit stretches into the cavity body; and a linear type gap is formed on the metal layer inside the cavity body. The volume of the cavity backed antenna is reduced greatly, and an operation bandwidth of the low profile antenna of the type is reduced obviously at the same time; manufacturing cost is reduced remarkably; and seamless integration between the low profile cavity backed integrated antenna and a planar circuit can be realized.
Description
Technical field
The invention belongs to microwave technical field, the low profile back-cavity that relates to a kind of band spread is antenna integrated, can be used as the antenna of radio frequency receiving and transmitting front end, be widely used in wireless communication systems such as mobile communication, satellite communication, radar, be particularly suitable for a little less than the received signal, need the application scenario of high-gain aerial.
Background technology
As the critical component of communication system, antenna is widely used in the radio communication occasion.The quality of antenna performance has directly determined the performance of whole system.High performance antenna not only can significantly improve the performance of system, obtains good reception, can greatly alleviate the index pressure of follow-up radio circuit simultaneously, reduces the cost of system.Especially in application scenarios, space such as radar, satellites, be not only excellent radiance to the demand of antenna, and volume weight is also had strict restriction.Design has the easily conformal high performance antenna of low profile and is even more important under these occasions.
The easy conformal antenna of current existing low profile mainly adopts the form of microstrip antenna or slot antenna, though this class antenna has the easily integrated advantage in conformal easy plane of low profile, their bandwidth are narrower and single radiating element performance is lower.In order to improve the radiation characteristic of this class antenna, be provided at the radiation characteristic that this class antenna element additional metal back of the body chamber can significantly improve antenna, but traditional metal backing cavity volume is big, be difficult to processing and processing cost high, destroyed the low profile advantage easy of integration of microstrip antenna or slot antenna.The novel cavity-backed radiator antenna that adopts substrate integrated waveguide technology to constitute has in recent years kept the high radiation character of cavity-backed radiator antenna again simultaneously on the basis that has kept microstrip antenna low profile advantage easy of integration, but it is narrow to be subject to the bandwidth of operation that operation principle can realize, has limited the application of such antenna.
Summary of the invention
The low profile back-cavity that the purpose of this invention is to provide a kind of band spread is antenna integrated, this novel linear polarized antenna radiance is good, gain is high, volume is little, simple in structure, be easy to design, be easy to processing, cost is low, and this antenna is compared the matched impedance bandwidth with existing low profile rear cavity line polarization antenna and obtained greatly broadening.
The antenna integrated dielectric substrate that comprises of the low profile back-cavity of band spread of the present invention;
Be coated in the last metal level and the lower metal layer that is coated in the dielectric substrate lower surface of dielectric substrate upper surface;
A plurality of electrical interconnection sequence of unit that run through metal level, dielectric substrate and lower metal layer are arranged the electrical interconnection array that constitutes; Duty ratio between any two adjacent electrical interconnection unit of formation electrical interconnection array is greater than 1;
Last metal level, lower metal layer and electrical interconnection array area surrounded constitute cavity;
Stretch into feed element and the slit on the metal level of cavity intra-zone in the cavity.
Described dielectric substrate is the single-layer medium substrate.
Described electrical interconnection unit is plated-through hole or metal column.
Described electrical interconnection array is for having the rectangle of opening on one side; Microstrip line, coplane strip line or coplanar waveguide transmission line that described feed element stretches into for the opening part by the electrical interconnection array; Described slit is the parallel vertical bar shaped slit, one side that has opening with the electrical interconnection array.
The low profile back-cavity of band spread of the present invention is antenna integrated to be to be equivalent to the novel cavity body structure in conventional metals chamber by the manufacturing of employing planar circuit process technology on common dielectric substrate, thereby has greatly reduced the volume of cavity-backed radiator antenna.With traditional cavity-backed radiator antenna need accurate machining different be that this new antenna comprises that feeding network can adopt the common planar circuit technology to make (as printed circuit board (PCB), LTCC etc.), cost of manufacture significantly reduces, and can realize seamless integrated with planar circuit.Only utilizing single second order cavity resonant pattern to form radiation with existing low profile back-cavity antenna compares, antenna of the present invention stretches into suitable dimensions in the cavity and slit suitable position in cavity by feed line is set, second order cavity resonant pattern and an accurate single order cavity resonant pattern can have been encouraged simultaneously, the rectangular region that the resonance range of wherein accurate single order cavity resonant pattern is positioned at non-feed end direction, is surrounded by rectangular slot and cavity broadside wall.These two kinds of cavity resonant patterns can produce effective radiation, thereby make the very big broadening of the antenna integrated matched impedance bandwidth in back of the body chamber of low profile on the basis that does not increase antenna size.
In the concrete rectangle cavity, a second order cavity modes resonance and an accurate single order cavity resonant pattern in cavity, have been encouraged simultaneously.When cavity is in these two kinds of modes of resonance, is influencing its field distribution hardly and can produce effective radiation near the etched non-resonant rectangular slot of cavity center annex.The distance of regulating the center of rectangular slot skew cavity can be adjusted in the resonance frequency of two kinds of modes of resonance that encourages in the cavity easily, and make it mutually away from, thereby the matched impedance bandwidth of effective broadening antenna.
The low profile back-cavity of band spread of the present invention is antenna integrated to have following beneficial effect:
A. this novel back of the body chamber is antenna integrated on the basis of the high radiation character that keeps existing low profile back-cavity antenna, the disresonance rectangular slot that is provided with by near position suitable the cavity center also is provided with suitable feed line size, can in cavity, encourage two different cavity resonant patterns simultaneously, thereby make the very big broadening of matched impedance bandwidth of antenna.Total comprises that feeding network and cavity can realize on dielectric substrate, make antenna volume greatly reduce, and entire antenna can be seamless integrated with radio frequency receiving and transmitting front end and even the complete plane of whole system, improved the integrated level of system.
B. this novel back of the body chamber integrated antenna structure is succinct, and operation principle is simple and clear.Only needing to regulate feed line in design process stretches into length in the cavity, the slit length of side of residing relative position and cavity in cavity and just can obtain needed performance.Structural parameters are few, the time that has shortened design greatly and optimized.
C. the antenna integrated manufacturing in this novel back of the body chamber is simple and convenient, just can realize with the common planar circuit technology.Compare with the precision machined cavity-backed radiator antenna of traditional needs, manufacturing speed is fast, and is with low cost.
Description of drawings
Fig. 1 is the perspective view of one embodiment of the invention;
Fig. 2 is the last metal-layer structure schematic diagram of Fig. 1;
Fig. 3 is the lower metal layer structural representation of Fig. 1;
Fig. 4 is the return loss plot figure of the embodiment of the invention;
Fig. 5 is the antenna pattern of the embodiment of the invention when frequency 9.7GHz;
Fig. 6 is the antenna pattern of the embodiment of the invention when frequency 10.3GHz.
Embodiment
As shown in Figure 1, the antenna integrated thickness that comprises of the low profile back-cavity of band spread is 0.5 millimeter dielectric substrate 1, and there is metal level on the two sides of dielectric substrate 1, is respectively metal level 5 and metal level 6.Running through dielectric substrate 1, metal level 5 and metal level 6, diameter is arranged is 1 millimeter through hole, and through-hole wall is coated with metal, forms electrical interconnection unit 3.A plurality of electrical interconnections unit 3 sequence arrangement be have a rectangle outline line and the rectangle length of side be respectively the electrical interconnection array of 17.8 millimeters and 12.3 millimeters, the electrical interconnection cell orifice spacing that constitutes the electrical interconnection array is identical, is 1.5 millimeters.Metal level 5, metal level 6 and electrical interconnection array institute inclusion region form the rectangle cavity.As Fig. 2, the band ground coplanar waveguide transmission line 2(dashed rectangle that metal level 5 is useful on feed comprises part), 1.5 millimeters of the length of coplanar waveguide transmission line 2, the width of the width of air gap and intermetallic metal band is respectively 0.7 millimeter and 1.45 millimeters, and coplanar waveguide transmission line 2 vertically stretches in the cavity from the center of rectangle cavity broadside.As Fig. 3, there are length and width to be respectively the rectangular slot 4 of 16.5 millimeters and 0.5 millimeter in the zone of metal level 6 respective chamber, the broadside in slit 4 is parallel with the broadside of rectangle cavity, and both are in the central lines of broadside, slit 4 at the center line of narrow edge direction and cavity in the broadside span of the broadside wall of feed end and non-feed end from being respectively 6.3 millimeters and 6.0 millimeters.
The concrete structure geometric parameter is as follows:
| L c (mm) | 17.8 | W c (mm) | 12.3 |
| L c (mm) | 16.5 | W s (mm) | 0.5 |
| d su (mm) | 6.3 | d sl (mm) | 6.0 |
| d (mm) | 1.0 | d p (mm) | 1.5 |
| L cpw (mm) | 1.5 | g cpw (mm) | 0.7 |
| W cpw ?(mm) | 1.45 | ? | ? |
Wherein
L c With
W c Be respectively the length of side of the narrow limit wall and the broadside wall of rectangle cavity,
L s With
W s Be respectively the length and the width in slit,
L Cpw ,
g Cpw With
W Cpw Be respectively the length of coplanar waveguide transmission line, the width of air gap and the width of intermetallic metal band,
d Su With
d Sl Be respectively the center line in slit and cavity distance at feed end broadside wall and non-feed end broadside wall,
dBe through-hole diameter,
d p Hole heart distance for through hole.
The antenna integrated concrete manufacture process of the low profile back-cavity of this band spread is: at first choose the dielectric substrate of corresponding parameter, make a band ground coplanar waveguide transmission line that is used for feed and a rectangular slot that is used for emittance at the metal level of dielectric substrate.Run through substrate and two sides metal level and beat a series of metal through holes, constitute broadside wall and rectangular slot parallel rectangular cavity.Select suitable aperture and pitch of holes, avoid the cavity self-energy outwards to reveal.This novel back cavity linear polarization antenna has kept the radiation characteristic of conventional metals cavity-backed radiator antenna high-gain.Select suitable gap position can regulate the matched impedance bandwidth of this antenna easily.Entire antenna can be fully realizes by common planar circuit fabrication technology, can be fully seamless integrated with radio frequency receiving and transmitting front end and even whole system.
The return loss of Fig. 4 shows that the matched impedance bandwidth of this antenna reaches 630MHz.No matter this antenna of the directional diagram of Fig. 5 and Fig. 6 surface still is that the H mask has high-gain at the E face in working band, the excellent radiation characteristic of low-cross polarization level etc.
Though described an embodiment for illustrative purposes with reference to the accompanying drawings, but will be understood that the present invention is not limited to this specific embodiment, those of ordinary skills can implement various other changes and improvements under the prerequisite that does not depart from the scope of the present invention.
Claims (6)
1. the low profile back-cavity of band spread is antenna integrated, it is characterized in that this antenna comprises:
Dielectric substrate;
Be coated in the last metal level and the lower metal layer that is coated in the dielectric substrate lower surface of dielectric substrate upper surface;
A plurality of electrical interconnection sequence of unit that run through metal level, dielectric substrate and lower metal layer are arranged the electrical interconnection array that constitutes; Described electrical interconnection array is for having the rectangle of opening on one side;
Last metal level, lower metal layer and electrical interconnection array area surrounded constitute cavity;
Stretch into feed element and the slit on the metal level of cavity intra-zone in the cavity.
2. the low profile back-cavity of band spread as claimed in claim 1 is antenna integrated, it is characterized in that described dielectric substrate is the single-layer medium substrate.
3. the low profile back-cavity of band spread as claimed in claim 1 is antenna integrated, it is characterized in that described electrical interconnection unit is plated-through hole or metal column.
4. the low profile back-cavity of band spread as claimed in claim 1 is antenna integrated, it is characterized in that microstrip line, coplane strip line or coplanar waveguide transmission line that described feed element stretches into for the opening part by the electrical interconnection array.
5. the low profile back-cavity of band spread as claimed in claim 1 is antenna integrated, it is characterized in that described slit is the parallel vertical bar shaped slit, one side that has opening with the electrical interconnection array.
6. the low profile back-cavity of band spread as claimed in claim 1 is antenna integrated, it is characterized in that constituting duty ratio between any two adjacent electrical interconnection unit of electrical interconnection array greater than 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100242261A CN102142616A (en) | 2011-01-21 | 2011-01-21 | Low profile cavity backed integrated antenna with widened frequency band |
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| CN2011100242261A CN102142616A (en) | 2011-01-21 | 2011-01-21 | Low profile cavity backed integrated antenna with widened frequency band |
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| CN102142616A true CN102142616A (en) | 2011-08-03 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762420A (en) * | 2014-02-25 | 2014-04-30 | 中国工程物理研究院电子工程研究所 | Terahertz wave back cavity type chip-loaded antenna |
| CN105762448A (en) * | 2016-04-29 | 2016-07-13 | 信阳师范学院 | Substrate integrated waveguide filter with characteristic of controllable hybrid electromagnetic coupling |
| CN108808254A (en) * | 2017-04-27 | 2018-11-13 | 中山大学 | A kind of cavity backed slot antenna of the substrate integration wave-guide based on load short circuit nail |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170214A (en) * | 2007-11-12 | 2008-04-30 | 杭州电子科技大学 | Dimension reduction low profile rear cavity line polarization antenna |
| CN101183742A (en) * | 2007-11-12 | 2008-05-21 | 杭州电子科技大学 | Rectangle substrate integrated waveguide back cavity linear polarization antenna |
| CN201966325U (en) * | 2011-01-21 | 2011-09-07 | 杭州电子科技大学 | Low-profile cavity backed integrated antenna with band spreading |
-
2011
- 2011-01-21 CN CN2011100242261A patent/CN102142616A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170214A (en) * | 2007-11-12 | 2008-04-30 | 杭州电子科技大学 | Dimension reduction low profile rear cavity line polarization antenna |
| CN101183742A (en) * | 2007-11-12 | 2008-05-21 | 杭州电子科技大学 | Rectangle substrate integrated waveguide back cavity linear polarization antenna |
| CN201966325U (en) * | 2011-01-21 | 2011-09-07 | 杭州电子科技大学 | Low-profile cavity backed integrated antenna with band spreading |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762420A (en) * | 2014-02-25 | 2014-04-30 | 中国工程物理研究院电子工程研究所 | Terahertz wave back cavity type chip-loaded antenna |
| CN103762420B (en) * | 2014-02-25 | 2016-08-17 | 中国工程物理研究院电子工程研究所 | A kind of THz wave back cavity type sheet carries antenna |
| CN105762448A (en) * | 2016-04-29 | 2016-07-13 | 信阳师范学院 | Substrate integrated waveguide filter with characteristic of controllable hybrid electromagnetic coupling |
| CN108808254A (en) * | 2017-04-27 | 2018-11-13 | 中山大学 | A kind of cavity backed slot antenna of the substrate integration wave-guide based on load short circuit nail |
| CN108808254B (en) * | 2017-04-27 | 2020-09-25 | 中山大学 | Back cavity type slot antenna of substrate integrated waveguide based on loading short-circuit nails |
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Application publication date: 20110803 |