CN102509885A - Changeless electric scanning leaky-wave antenna based on barium strontium titanate film - Google Patents
Changeless electric scanning leaky-wave antenna based on barium strontium titanate film Download PDFInfo
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- CN102509885A CN102509885A CN2011103708691A CN201110370869A CN102509885A CN 102509885 A CN102509885 A CN 102509885A CN 2011103708691 A CN2011103708691 A CN 2011103708691A CN 201110370869 A CN201110370869 A CN 201110370869A CN 102509885 A CN102509885 A CN 102509885A
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- strontium titanate
- barium strontium
- collateral branch
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Abstract
The invention discloses a changeless electric scanning leaky-wave antenna based on barium strontium titanate film, and comprises an underlay substrate, a plurality of period circuit units and two impedance adapters, wherein a conducting metal film layer is arranged on the back side of the underlay substrate, two impedance adapters and a plurality of period circuit units are mounted on the front side of the underlay substrate; the two impedance adapters are mounted at the two ends of the underlay substrate; and the plurality of period circuit units are connected in series in sequence to form a serial array, and then connected between the two impedance adapters. The changeless electric scanning leaky-wave antenna provided by the invention changes the voltage of two ends of a variable capacitor to control the change of antenna scanning angles, further achieves the purpose that the antenna beams can be scanned in a changeless frequency condition, and compared with the conventional microstrip leaky-wave antenna structure, the changeless electric scanning leaky-wave antenna is more reasonable and compact in structure, the material performance is excellent, and the stability of the leaky-wave antenna is greatly improved.
Description
Technical field
The present invention relates to a kind of microband leaky-wave antenna, more particularly to it is a kind of can be in the adjustable electric scanning leaky-wave antenna based on barium strontium titanate of wave beam under fixed frequency.
Background technology
In the last few years, microband leaky-wave antenna can be scanned with beam frequencies, light weight, easily it is conformal it is integrated, be easy to matching the advantages of obtain very big concern.But, conventional microstrip leaky-wave antenna is only operable on high-order mode state, and this is accomplished by special feed structure to suppress basic mode, adds design difficulty.And electromagnetic wave in traditional sucrose material its propagate its phase constant
All it is on the occasion of by the scanning angle formula of leaky-wave antenna
Understand, the antenna based on traditional sucrose material can only realize forward radiation, it is impossible to realize it is backward to it is preceding to a wide range of radiation.In order to overcome the disadvantages mentioned above of antenna, people introduce left-right-hand composite transmission line（CRLH-TL）To build leaky-wave antenna, left-right-hand composite transmission line（CRLH-TL）At least it is made up of a transmission line unit, transmission line unit is by the left-handed transmission line capacitance connected
With right-handed transmission line inductance, right-handed transmission line capacitance in parallel
With left hand transmission line inductance
Constitute.Left-right-hand composite transmission line（CRLH-TL）Propagation constant
As the increase of frequency is from left hand area（
）To right hand region（
）Gradually change, by formula
Understand, can realize that the backward of wave beam is scanned before to wide range of frequencies using the special positive-negative phase constant characteristic of left-and-right-hand transmission line, while leaky-wave antenna can be made to work in basic mode state, significantly simplify feeding network.
But, working frequency is usually fixed for many communication systems, it is impossible to sweeps characteristic using the frequency of leaky-wave antenna, thus realizes that wave beam can be scanned and will be of great practical significance under microband leaky-wave antenna frequency fixing situation.Therefore, people introduce varactor to realize to transmission in the design
The regulating and controlling voltage of value, can so realize that antenna scan angle changes with the change of applied voltage, i.e., in the case where frequency is fixed
.But varactor is that sequential Stereoscopic element and planar integrated circuit are incompatible, this will increase the unstability of antenna, while destroy its low section characteristic, want compatible variable capacitance to solve the above problems with integrated circuit if can introduce.
The content of the invention
Frequency electric scanning leaky-wave antenna determined based on barium strontium titanate variable capacitance it is an object of the invention to provide a kind of, with solve in the prior art microband leaky-wave antenna the problem of beam scanning is realized in the case that frequency is fixed.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
It is a kind of that frequency electric scanning leaky-wave antenna is determined based on barium strontium titanate, include substrate base, the back side of the substrate base is provided with conductive metal film layer, positive two ends are provided with two impedance matching boxs, the serial array being followed in series to form by several structure identical periodic circuit units is installed between described two impedance matching boxs, it is characterised in that：Each periodic circuit unit includes ground terminal, conducting metal portion and the T-shaped collateral branch inductance for being arranged on the conducting metal portion left and right sides, interdigital capacitor is connected between the vertical end of each T-shaped collateral branch inductance and conducting metal portion, each T-shaped collateral branch inductance vertical end end is provided with the through hole for sequentially passing through T-shaped collateral branch inductance and substrate base, metal is filled in the through hole hole, the vertical end end of T-shaped collateral branch inductance is electrically connected by conductive metal layer with the conductive metal film layer at the substrate base back side, conducting metal portion both sides connect the contact of oriented both sides T-shaped collateral branch inductance level end extension, each provided with barium strontium titanate layer between contact and corresponding T-shaped collateral branch inductance level end, barium strontium titanate layer is respectively with contact and horizontal end in contact and separating contact and horizontal ends and constituting variable capacitance；Conducting metal portion upper end is connected with contact, provided with barium strontium titanate layer between conducting metal portion upper end contact and ground terminal, barium strontium titanate layer is respectively with conducting metal portion upper end contact and ground terminal contact and separating conducting metal portion upper end contact and ground terminal constitutes variable capacitance, the ground terminal is provided with the through hole for sequentially passing through ground terminal and substrate base, metal is filled in the through hole hole, the ground terminal is electrically connected by conductive metal layer with the conductive metal film layer at the substrate base back side；Adjacent periodic circuit unit ZhongTXing collateral branch inductance is sharing unit, left side T-shaped collateral branch inductance i.e. in this cycle circuit unit is simultaneously the right side T-shaped collateral branch inductance in the adjacent periods circuit unit of left side, and the right side T-shaped collateral branch inductance in this cycle circuit unit is simultaneously the left side T-shaped collateral branch inductance in the adjacent periods circuit unit of right side.
It is described a kind of frequency electric scanning leaky-wave antenna to be determined based on barium strontium titanate, it is characterised in that：In described two impedance matching boxs, the output end of one of impedance matching box is connected with the horizontal ends of the left side T-shaped collateral branch inductance of first periodic circuit unit in several periodic circuit unit serial arrays, and the input of another impedance matching box is connected with the horizontal ends of the right side T-shaped collateral branch inductance of last periodic circuit unit in several periodic circuit unit serial arrays.
It is described a kind of frequency electric scanning leaky-wave antenna to be determined based on barium strontium titanate, it is characterised in that：The dielectric constant size of the barium strontium titanate layer changes with the change of applying bias.
It is described a kind of frequency electric scanning leaky-wave antenna to be determined based on barium strontium titanate, it is characterised in that：The variable capacitance is a kind of variable capacitance based on barium strontium titanate material, and its capacitance can change with the change of applying bias.
It is described a kind of frequency electric scanning leaky-wave antenna to be determined based on barium strontium titanate, it is characterised in that：The conductive metal film layer choosing common metal film, the substrate base is from conventional substrate material.
Beneficial effects of the present invention are：
The present invention uses a kind of variable capacitance based on barium strontium titanate, its dielectric constant size changes as applying bias change, therefore it can be added in the voltage at variable capacitance two ends to control the change of scanning angle by change, and then realize the purpose that wave beam can be scanned under fixed frequency.And in the relatively existing microband leaky-wave antenna structure of structure of the present invention more rationally, material property is excellent, and the stability of leaky-wave antenna is substantially improved.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is the structural representation of a cycle circuit unit of the present invention.
Fig. 3 is the connection diagram of adjacent periods circuit unit of the present invention.
Fig. 4 is the equivalent circuit diagram of a cycle circuit unit of the present invention.
Fig. 5 is a kind of structural representation of variable capacitance in the present invention.
Fig. 6 is the profile of variable capacitance shown in Fig. 5.
Fig. 7 is another structural representation of variable capacitance in the present invention.
Fig. 8 is the profile of variable capacitance shown in Fig. 7.
Embodiment
As shown in Figure 1, the present invention includes substrate base 1, the back side of substrate base 1 is provided with conductive metal film layer, and positive two ends are provided with the serial array for being provided with and being followed in series to form by several structure identical periodic circuit units 3 between two impedance matching boxs 2, two impedance matching boxs 2.
As shown in Figure 2, several structures of periodic circuit unit 3 are identical, including ground terminal 6, conducting metal portion 5 and the T-shaped collateral branch inductance 8 for being arranged on the left and right sides of conducting metal portion 5, 9, each T-shaped collateral branch inductance 8, interdigital capacitor 7 is connected between 9 vertical end and conducting metal portion 5, each T-shaped collateral branch inductance 8, 9 vertical end ends are provided with and sequentially pass through T-shaped collateral branch inductance 8, 9 and the through hole 13 of substrate base 1, metal is filled with the hole of through hole 13, T-shaped collateral branch inductance 8, 9 by conductive metal layer with and the back side of substrate base 1 conductive metal film layer electrically connect, the both sides of conducting metal portion 5 connect oriented both sides T-shaped collateral branch inductance 8, the contact of 9 horizontal ends extension, each provided with barium strontium titanate layer between contact and corresponding T-shaped collateral branch inductance level end, barium strontium titanate layer is respectively with contact and horizontal end in contact and separating contact and horizontal ends and constituting variable capacitance 10, 11；The upper end of conducting metal portion 5 is connected with contact, provided with barium strontium titanate layer between the upper end contact of conducting metal portion 5 and ground terminal 6, barium strontium titanate layer contacts with the upper end contact of conducting metal portion 5 and ground terminal 6 and separates the upper end contact of conducting metal portion 5 and ground terminal 6 respectively constitutes variable capacitance 12, ground terminal 6 is provided with the through hole 13 for sequentially passing through ground terminal 6 and substrate base 1, conductive metal layer is coated with the hole of through hole 13, ground terminal 6 is electrically connected by conductive metal layer with the conductive metal film layer at the back side of substrate base 1.
As shown in Figure 3, adjacent periodic circuit unit ZhongTXing collateral branch inductance is sharing unit, left side T-shaped collateral branch inductance i.e. in this cycle circuit unit is simultaneously the right side T-shaped collateral branch inductance in the adjacent periods circuit unit of left side, and the right side T-shaped collateral branch inductance in this cycle circuit unit is simultaneously the left side T-shaped collateral branch inductance in the adjacent periods circuit unit of right side.
In two impedance matching boxs 2, the output end of one of impedance matching box is connected with the horizontal ends of the left side T-shaped collateral branch inductance of first periodic circuit unit in several periodic circuit unit serial arrays, and the input of another impedance matching box is connected with the horizontal ends of the right side T-shaped collateral branch inductance of last periodic circuit unit in several periodic circuit unit serial arrays.
The dielectric constant size of barium strontium titanate layer changes with the change of applying bias, and variable capacitance is a kind of variable capacitance based on barium strontium titanate material, and its capacitance can change with the change of applying bias.
Conductive metal film layer choosing common metal film, substrate base is from conventional substrate material.
As shown in Figure 4, each periodic circuit unit is made up of series connection interdigitated capacitors, collateral branch in parallel inductor, conducting metal portion and three variable capacitances based on barium strontium titanate, wherein series connection interdigitated capacitors produce parasitic series inductance LR while series capacitance CL is produced due to the function of current between plain conductor, and collateral branch's inductor in parallel is while shunt inductance LL is produced because voltage drop is present and produces parasitic shunt capacitance CR.So series capacitance, inductance and shunt capacitance, inductance constitute a balanced structure composite right/left-handed transmission line unit, by set the parameter value of four elements in left-right-hand composite transmission line unit can obtain special frequency channel scattering curve (
), the last load-modulate in periodic circuit unit
Curve is that phase constant under fixed frequency can be achieved
Change.For the impedance uniformity of holding circuit, 3 structure identical variable capacitance Cvar are loaded with respectively.Several such periodic circuit units are concatenated in a linear fashion can be fixed the adjustable leaky-wave antenna of wave beam under frequency, and feeder line uses micro-strip form, and the impedance matching box that two ends include can be realized and required matches impedances.
As shown in Figure 5, Figure 6, the present embodiment is a kind of structural representation of variable capacitance in the present invention.Variable capacitance uses a kind of sandwich structure, including upper and lower layer metal electrode 15,16 and the interlayer 14 based on barium strontium titanate material in the present embodiment.The manufacturing process of whole antenna is as follows：（1）Cleaning treatment is carried out to substrate base, using microelectronics photoetching process in substrate base front sputtering periodic circuit cell array and impedance transformer, metal layer thickness is 300-400nm；（2）The thick barium strontium titanates of one layer of 400-500nm are sputtered in the variable capacitance Vcar regions of each periodic circuit unit；（3）Finally one layer of 200-300nm thick metal layers are sputtered again in barium strontium titanate upper surface as Top electrode；（4）At the back side of substrate base with all sputtering layer of metal.Bias is carried on barium strontium titanate by upper/lower electrode, and then changes capacitance by applying bias, the change by external bias under specific frequency for whole antenna can be achieved before and after antenna beam to scanning.
As shown in Figure 7, Figure 8, the present embodiment is another structural representation of variable capacitance in the present invention.Variable capacitance uses a kind of interdigital structure in the present embodiment, metal electrode 18,19 including interdigital structure each other and the dielectric layer 17 based on barium strontium titanate material for being arranged on the metal electrode 18 of interdigital structure, 19 lower surfaces, interdigital structure has the advantages that simple in construction, easily prepared compared with sandwich structure.The manufacturing process of whole antenna is as follows：（1）Cleaning treatment is carried out to substrate, the variable capacitance region of each periodic circuit unit sputters one layer of 400nm-500nm barium strontium titanate on substrate base front using microelectronics photoetching process；（2）Microelectronics photoetching process is reused in the positive deposition cycle circuit unit array of substrate base and impedance transformer, metal layer thickness is 300-400nm, and the width of fork value every electrode of bias electrode is that the spacing between 1-2um, every electrode is 0.75um-1.5um；（3）At the back side of substrate base with all sputtering layer of metal.Bias is carried on barium strontium titanate using interdigital electrode, and then changes capacitance by applying bias, the change by external bias under specific frequency for whole antenna can be realized before and after antenna beam to scanning.
Claims (5)
1. a kind of determine frequency electric scanning leaky-wave antenna based on barium strontium titanate, include substrate base, the back side of the substrate base is provided with conductive metal film layer, positive two ends are provided with two impedance matching boxs, the serial array being followed in series to form by several structure identical periodic circuit units is installed between described two impedance matching boxs, it is characterised in that：Each periodic circuit unit includes ground terminal, conducting metal portion and the T-shaped collateral branch inductance for being arranged on the conducting metal portion left and right sides, interdigital capacitor is connected between the vertical end of each T-shaped collateral branch inductance and conducting metal portion, each T-shaped collateral branch inductance vertical end end is provided with the through hole for sequentially passing through T-shaped collateral branch inductance and substrate base, metal is filled in the through hole hole, the vertical end end of T-shaped collateral branch inductance is electrically connected by conductive metal layer with the conductive metal film layer at the substrate base back side, conducting metal portion both sides connect the contact of oriented both sides T-shaped collateral branch inductance level end extension, each provided with barium strontium titanate layer between contact and corresponding T-shaped collateral branch inductance level end, barium strontium titanate layer is respectively with contact and horizontal end in contact and separating contact and horizontal ends and constituting variable capacitance；Conducting metal portion upper end is connected with contact, provided with barium strontium titanate layer between conducting metal portion upper end contact and ground terminal, barium strontium titanate layer is respectively with conducting metal portion upper end contact and ground terminal contact and separating conducting metal portion upper end contact and ground terminal constitutes variable capacitance, the ground terminal is provided with the through hole for sequentially passing through ground terminal and substrate base, metal is filled in the through hole hole, the ground terminal is electrically connected by conductive metal layer with the conductive metal film layer at the substrate base back side；Adjacent periodic circuit unit ZhongTXing collateral branch inductance is sharing unit, left side T-shaped collateral branch inductance i.e. in this cycle circuit unit is simultaneously the right side T-shaped collateral branch inductance in the adjacent periods circuit unit of left side, and the right side T-shaped collateral branch inductance in this cycle circuit unit is simultaneously the left side T-shaped collateral branch inductance in the adjacent periods circuit unit of right side.
A kind of frequency electric scanning leaky-wave antenna is determined based on barium strontium titanate 2. according to claim 1, it is characterised in that：In described two impedance matching boxs, the output end of one of impedance matching box is connected with the horizontal ends of the left side T-shaped collateral branch inductance of first periodic circuit unit in several periodic circuit unit serial arrays, and the input of another impedance matching box is connected with the horizontal ends of the right side T-shaped collateral branch inductance of last periodic circuit unit in several periodic circuit unit serial arrays.
A kind of frequency electric scanning leaky-wave antenna is determined based on barium strontium titanate 3. according to claim 1, it is characterised in that：The dielectric constant size of the barium strontium titanate layer changes with the change of applying bias.
A kind of frequency electric scanning leaky-wave antenna is determined based on barium strontium titanate 4. according to claim 1, it is characterised in that：The variable capacitance is a kind of variable capacitance based on barium strontium titanate material, and its capacitance can change with the change of applying bias.
A kind of frequency electric scanning leaky-wave antenna is determined based on barium strontium titanate 5. according to claim 1, it is characterised in that：The conductive metal film layer choosing common metal film, the substrate base is from conventional substrate material.
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|---|---|---|---|
| CN2011103708691A CN102509885A (en) | 2011-11-21 | 2011-11-21 | Changeless electric scanning leaky-wave antenna based on barium strontium titanate film |
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| CN2011103708691A CN102509885A (en) | 2011-11-21 | 2011-11-21 | Changeless electric scanning leaky-wave antenna based on barium strontium titanate film |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409852A (en) * | 2014-12-25 | 2015-03-11 | 哈尔滨工业大学 | Fixed frequency scanning leaky-wave antenna based on liquid crystal material |
| CN105322895A (en) * | 2015-05-06 | 2016-02-10 | 苏州能讯高能半导体有限公司 | Bias self-adaptive internal matching power amplifier tube and power amplification module based on same |
| CN107768812A (en) * | 2016-08-23 | 2018-03-06 | 上海交通大学 | The adjustable graphene leaky-wave antenna of wave beam |
| CN109286066A (en) * | 2018-08-28 | 2019-01-29 | 南京邮电大学 | A kind of leaky-wave antenna of Stepped Impedance composite left-and-right-hand structure |
| CN111029780A (en) * | 2019-12-26 | 2020-04-17 | 深圳市信维通信股份有限公司 | Leaky-wave antenna periodic unit and leaky-wave antenna |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409852A (en) * | 2014-12-25 | 2015-03-11 | 哈尔滨工业大学 | Fixed frequency scanning leaky-wave antenna based on liquid crystal material |
| CN104409852B (en) * | 2014-12-25 | 2017-04-12 | 哈尔滨工业大学 | Fixed frequency scanning leaky-wave antenna based on liquid crystal material |
| CN105322895A (en) * | 2015-05-06 | 2016-02-10 | 苏州能讯高能半导体有限公司 | Bias self-adaptive internal matching power amplifier tube and power amplification module based on same |
| CN107768812A (en) * | 2016-08-23 | 2018-03-06 | 上海交通大学 | The adjustable graphene leaky-wave antenna of wave beam |
| CN107768812B (en) * | 2016-08-23 | 2020-06-12 | 上海交通大学 | Graphene leaky-wave antenna with adjustable wave beams |
| CN109286066A (en) * | 2018-08-28 | 2019-01-29 | 南京邮电大学 | A kind of leaky-wave antenna of Stepped Impedance composite left-and-right-hand structure |
| CN111029780A (en) * | 2019-12-26 | 2020-04-17 | 深圳市信维通信股份有限公司 | Leaky-wave antenna periodic unit and leaky-wave antenna |
| CN111029780B (en) * | 2019-12-26 | 2022-01-25 | 深圳市信维通信股份有限公司 | Leaky-wave antenna periodic unit and leaky-wave antenna |
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Application publication date: 20120620 |