CN106058445A - Three-layer metal plate based broadband transmission array antenna - Google Patents

Three-layer metal plate based broadband transmission array antenna Download PDF

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Publication number
CN106058445A
CN106058445A CN 201610596425 CN201610596425A CN106058445A CN 106058445 A CN106058445 A CN 106058445A CN 201610596425 CN201610596425 CN 201610596425 CN 201610596425 A CN201610596425 A CN 201610596425A CN 106058445 A CN106058445 A CN 106058445A
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longitudinal
slot
longitudinal slot
slit
transmission
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CN 201610596425
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Chinese (zh)
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刘广
王宏建
易敏
刘洋
薛飞
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中国科学院国家空间科学中心
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/36Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00Antenna arrays or systems

Abstract

The present invention provides a three-layer metal plate based broadband transmission array antenna comprising a three-layer metal plate; the layers of the plate are in parallel to each other; each layer is etched with a plurality of finger type slot units that are arranged at equal intervals on each layer of the metal plate. Each finger-type slot unit sequentially comprises a first longitudinal slot, a second longitudinal slot, a third longitudinal slot, a fourth longitudinal slot, and a fifth longitudinal slot; the first longitudinal slot, the second longitudinal slot, the third longitudinal slot, the fourth longitudinal slot, and the fifth longitudinal slot are parallel to each other. Of the five slots, divided equally by the third longitudinal slot, the left two longitudinal slots are symmetrical with the right two longitudinal slots. The finger-type slot unit further comprises a first transverse slot that is perpendicular to and across the first longitudinal slot, the second longitudinal slot, the third longitudinal slot, the fourth longitudinal slot, and the fifth longitudinal slot.

Description

一种基于三层金属平板的宽带传输阵列天线 Based on three metal plates broadband transmission array antenna

技术领域 FIELD

[0001] 本发明涉及天线技术领域,特别涉及一种基于三层金属平板的宽带传输阵列天线。 [0001] Technical Field The present invention relates to an antenna, more particularly to a broadband transmission array antenna based on three metal plates.

背景技术 Background technique

[0002] 天线在通信、广播、电视、雷达和导航等无线电系统中被广泛的应用,起到了传播无线电波的作用,是有效地辐射和接收无线电波必不可少的装置。 [0002] In a communication antenna, radio, television, radar and radio navigation systems are widely used, acts as a propagation of radio waves, and is effectively radiated radio wave receiving means essential. 其中,阵列天线是一类由不少于两个天线单元规则或随机排列并通过适当激励获得预定辐射特性的特殊天线。 Wherein the array antenna is a special antenna are randomly arranged by not less than two antenna elements and to obtain a predetermined rule or by an appropriate excitation radiation characteristics.

[0003] 目前,现有的传输阵列天线,一般包含馈源和传输阵列两部分,通过设计传输阵列中的每个单元的传输相位,对馈源辐射的球面波进行相位补偿,即可将馈源辐射的球面波转化为平面波,从而实现高增益波束。 [0003] Currently, the conventional array antenna transmission, comprising generally two parts and feed the transmission array, the feed horn of the spherical wave by phase compensation design of the transmission phase of each transmission cell array, can be fed the radiation source plane wave into a spherical wave, thereby realizing a high gain beam. 但是现有的传输阵列天线,往往是四层结构,加工难度较大,而且天线的IdB增益带宽较窄,一般在10%以内。 However, the conventional array antenna transmission, often four-layer structure, difficult processing, IdB gain and bandwidth of the antenna is narrow, typically less than 10%.

发明内容 SUMMARY

[0004] 本发明的目的在于,为解决对现有的宽带传输阵列天线存在加工难度大,IdB增益带宽小于10%,工作宽带较窄的缺陷,本发明提供了一种基于三层金属平板的宽带传输阵列天线,包括三层金属平板,所述的金属平板的层与层之间呈平行关系,所述的每一层的金属平板都蚀刻了多个指型缝隙单元,并且所述的多个指型缝隙单元呈等间距排列在所述的金属平板的每一层上,其中,所述指型缝隙单元依次顺序包括:第一纵向缝隙,第二纵向缝隙,第三纵向缝隙,第四纵向缝隙,和第五纵向缝隙,所述第一纵向缝隙,所述第二纵向缝隙,所述第三纵向缝隙,所述第四纵向缝隙和所述第五纵向缝隙之间相互平行,且关于所述第三纵向缝隙呈左右对称分布;所述指型缝隙单元还包括第一横向缝隙,所述第一横向缝隙垂直且穿过所述第一纵向缝隙,所述第二纵向 [0004] The object of the present invention is to solve the existing broadband transmission array antenna is present difficult process, IdB gain bandwidth of less than 10%, the operation band narrower defects, the present invention provides a method based on three metal plates broadband transmission array antenna comprising three metal plates, parallel relationship between the layers of the metal plates, the metal plates of each layer are interdigitated etching a plurality of slits unit and the multi- It refers to a form a slit type unit are arranged equidistantly on each layer of the metal plate, wherein the finger-type sequential order slot unit comprises: a first longitudinal slot, a second longitudinal slot, the longitudinal slot of the third, fourth longitudinal slits, and the fifth longitudinal slot, between the first longitudinal slot, a second longitudinal slot, said longitudinal slot of the third, the fourth and the fifth longitudinal slot parallel longitudinal slots, and on the third form of longitudinal slits symmetrically distributed; refers to the slot type unit further comprises a first transverse slots, said first vertical and lateral slits through the first longitudinal slot, said second longitudinal 隙,所述第三纵向缝隙,所述第四纵向缝隙和所述第五纵向缝隙。 Gap, said third longitudinal slit, the longitudinal slit of the fourth and the fifth longitudinal slit.

[0005] 所述第二纵向缝隙的长度大于所述第一纵向缝隙的长度,所述第三纵向缝隙的长度大于所述第二纵向缝隙,所述第一纵向缝隙的长度与第五纵向缝隙的长度相同;所述第二纵向缝隙的长度与所述第四纵向缝隙的长度相同。 [0005] The length of the second slot is greater than the longitudinal length of the first longitudinal slot, the longitudinal length of the third slot is greater than the second longitudinal slit, the longitudinal length of the first slot of the fifth longitudinal slot the same length; the same length as the second longitudinal slit of the fourth longitudinal slit.

[0006] 所述的金属平板的层与层之间的间距为天线波长的四分之一。 [0006] the spacing between the layers of the metal plate is a quarter wavelength of the antenna.

[0007] 所述第一横向缝隙包括第一横向缝隙宽度;通过计算获得所述宽带传输阵列天线中的每个所述指型缝隙单元的传输相位,根据传输相位与所述指型缝隙单元中的第一横向缝隙的宽度的对应关系的图表,获得每个所述指型缝隙单元中的第一横向缝隙的宽度;当馈源辐射的电磁波经过所述的宽带传输阵列天线时,每个所述指型缝隙单元中的第一横向缝隙的宽度通过计算和传输相位曲线进行设计,即可对馈源辐射的电磁波进行相位补偿, 将馈源辐射的球面波转换成平面波,从而实现高增益波束。 [0007] The first transverse slot includes a first transverse slit width; obtaining a transmission phase of each of the finger-type transmission slot unit in the wideband array antenna by calculation, according to the transmission phase type finger slot unit graph of the correspondence relationship between the width of the first lateral slits, the width of each of the fingers to obtain slit type unit of the first lateral slot; when the feed passes through the electromagnetic wave radiated broadband transmission array antennas, each of refers to said width of the slit type unit by a first transverse slot calculation and transmission phase curves, the feed to electromagnetic radiation of phase compensation, converts the spherical wave feed horn into a plane wave, in order to achieve high gain beam .

[0008] 本发明的优点在于:采用三层金属平板式的传输阵列天线,降低了传输天线的加工难度,扩展了其IdB增益带宽和工作带宽。 [0008] The advantage of the present invention is that: the use of three metal plate type transmission array antenna, reduced processing difficulty transmission antennas, IdB gain bandwidth expanded and its working bandwidth.

附图说明 BRIEF DESCRIPTION

[0009]图1(a)是本发明的指型缝隙单元的结构示意图的俯视图 [0009] FIG. 1 (a) is a schematic plan view of the interdigital gap structure unit of the present invention of FIG.

[0010]图1(b)是本发明的指型缝隙单元的结构示意图的侧视图 [0010] FIG. 1 (b) is a side view of the interdigital gap structure diagram of the unit according to the present invention.

[0011] s纵向缝隙的宽度Ll第一纵向缝隙的长度 [0011] The length Ll of the first longitudinal slot width of the longitudinal slit s

[0012] L2第二纵向缝隙的长度L3第三纵向缝隙的长度 [0012] L2 of the second longitudinal slot length L3 of the third longitudinal slot

[0013] W第一横向缝隙的宽度h三层金属平板的层与层之间的间距 [0013] W spacing between the layers of the width h of three metal plates of the first transverse slot

[0014] L第一横向缝隙的长度 [0014] The length L of the first transverse slot

[0015] 图2是本发明的一种基于三层金属平板的宽带传输阵列天线的示意图 [0015] FIG. 2 is a schematic diagram of the present invention is based on three metal plates broadband transmission array antenna

[0016] 图3是本发明的指型缝隙单元的传输相位与第一横向缝隙宽度的关系曲线 [0016] FIG. 3 is a graph of the transmission type phase refers slit unit of the invention with a first lateral width of the slit

[0017] 图4是本发明的一种基于三层金属平板的宽带传输阵列天线的传输相位的数据表 [0017] FIG. 4 is a transmission phase of the present invention is based on the broadband transmission antenna array of three metal plates datasheet

[0018] 图5是本发明的一种基于三层金属平板的宽带传输阵列天线的频率-增益曲线[0019]图6是本发明的一种基于三层金属平板的宽带传输阵列天线的俯视图 [0018] FIG. 5 of the present invention is a broadband transmission based on the frequency of the antenna array of three metal plates - gain curve [0019] FIG. 6 is a broadband transmission based on the present invention, three metal plates of an array antenna plan view

具体实施方式 detailed description

[0020] 以下结合附图对本发明作进一步的详细说明。 [0020] conjunction with the drawings of the present invention will be further described in detail.

[0021] 如图1(a),l(b),2和6所示,本发明提供一种基于三层金属平板的宽带传输阵列天线,包括三层金属平板,所述的金属平板的层与层之间呈平行关系,所述的每一层的金属平板都蚀刻了多个指型缝隙单元,单元尺寸为12mmX 12mm,并且所述的多个指型缝隙单元呈等间距排列在所述的金属平板的每一层上,其中,所述指型缝隙单元从左至右依次包括:第一纵向缝隙,第二纵向缝隙,第三纵向缝隙,第四纵向缝隙和第五纵向缝隙,所述第一纵向缝隙,所述第二纵向缝隙,所述第三纵向缝隙,所述第四纵向缝隙和所述第五纵向缝隙之间相互平行,且关于所述第三纵向缝隙呈左右对称分布,所述指型缝隙单元还包括第一横向缝隙,其包括所述第一横向缝隙宽度;所述第一横向缝隙垂直且穿过所述第一纵向缝隙,所述第二纵向缝隙,所述第三纵向缝隙,所述第四 [0021] FIG. 1 (a), l (b), 2 and 6, the present invention provides a broadband transmission array antenna based on three metal plates, comprising three metal plates, the metal plate layer the parallel relationship between the layers, each layer of the metal plates have a plurality of interdigitated etching slits unit cell size of 12mmX 12mm, shape and type of the plurality of finger means are equally spaced slits in the each layer of the metal plate, wherein the finger from left to right type slot unit comprises: a first longitudinal slot, a second longitudinal slot, the longitudinal slot of the third, fourth and fifth longitudinal slot longitudinal slot, the said first longitudinal slot, the longitudinal slot between said second, said third longitudinal slit, the longitudinal slit of the fourth and the fifth longitudinal slot parallel to each other and with respect to the third longitudinal slits symmetrically distributed form the slit type unit means further comprises a first transverse slot comprising said first lateral slit width; perpendicular to the first lateral slot and through the first longitudinal slot, a second longitudinal slot, said third longitudinal slot, said fourth 向缝隙和所述第五纵向缝隙。 And the fifth longitudinal slit to slit.

[0022] 如图1(a)所示,所述第一纵向缝隙,所述第二纵向缝隙,所述第三纵向缝隙,所述第四纵向缝隙和所述第五纵向缝隙的缝隙宽度s均为0.8mm,所述第一纵向缝隙的长度Ll为5.5mm,所述第二纵向缝隙的长度L2为7.7mm,所述第三纵向缝隙的长度L3为I Imm;所述第二纵向缝隙的长度L2大于所述第一纵向缝隙的长度Ll,所述第三纵向缝隙的长度L3大于所述第二纵向缝隙的长度L2,所述第一纵向缝隙的长度Ll与第五纵向缝隙的长度相同;所述第二纵向缝隙的长度L2与所述第四纵向缝隙的长度相同。 [0022] FIG. 1 (a), the said first longitudinal slot, a second longitudinal slot, said third longitudinal slot, said slot of said fourth and fifth longitudinal slit longitudinally slit width s are 0.8mm, the length Ll of the first longitudinal slit of 5.5mm, a length L2 of the second longitudinal slit is 7.7mm, the third length L3 of the longitudinal slot I Imm; the second longitudinal slot length L2 greater than the first longitudinal length Ll of the slot, the longitudinal slot of the third length L3 greater than the length of the second longitudinal slot L2, the length of the first longitudinal slot length Ll of the fifth slits, same; the same longitudinal length of the second slot length L2 of the fourth longitudinal slit.

[0023]所述的金属平板的层与层之间的间距h为天线波长的四分之一。 [0023] The distance h between the layers of the metal plate is a quarter wavelength of the antenna.

[0024]如图2所示,假设在三维坐标系中,馈源的坐标为(Xf,yf,zf),所述的宽带传输阵列天线位于xoy平面,其中第i个单元的坐标为(xi,yi,0)。 [0024], assuming that the three-dimensional coordinate system, the coordinates of feed (Xf, yf, zf), said broadband transmission xoy plane array antenna is located, where the coordinates of the i-th element (xi Figure 2 , yi, 0). 假设每个单元的传输相位为奶(Λ.,乃),那么辐射波束指向:(%,吼;)与每个传输单元的位置(X i,yi,0 )和传输相位於(.Wi),以及馈源的位置(Xf,yf,Zf)的关系式如下所示: Suppose the transmission phase each unit of the milk, then the radiation beam pointing (Lambda, is the.): (% Roar;) the position (X i, yi, 0) and the phase of each transport unit is located (.Wi) , and a feed position (Xf, yf, Zf) of the relationship are as follows:

[0025] φ, (xr y,) = Zi0 (d, - sin 0t) (x cos+ j- sin ^11)) ( I ) [0025] φ, (xr y,) = Zi0 (d, - sin 0t) (x cos + j- sin ^ 11)) (I)

[0026] 其中ko为自由空间中的波数,Cl1为馈源与第i个单元之间的距离: [0026] where ko is the free space wavenumber, Cl1 feed and the distance between the i-th unit:

[0027] [0027]

Figure CN106058445AD00051

(2) (2)

[0028] 对所述的每一个指型缝隙单元的传输特性进行计算,计算结果如图3所示,当所述第一横向缝隙宽度w由1.2mm增大至4.5mm时,所述的指型缝隙单元的传输相位随着所述第一横向缝隙宽度w的改变可以实现360°范围的传输相位变化。 [0028] calculation means for each transmission characteristic of the slit type unit, the calculation results shown in Figure 3, when the first lateral slit width w increases from 1.2mm to 4.5mm, the fingers a transmission type phase change with a slit unit of the slit width w of the first lateral transmission range of 360 ° phase change can be achieved.

[0029] 该传输阵列天线的口径为156mm,喇叭馈源距离阵面124.8mm,由公式(1)和公式(2)可得该传输阵列天线中每个所述指型缝隙单元的传输相位分布如图4所示。 [0029] The aperture array antenna transmission to 156mm, from the front horn feed 124.8mm, by the formula (1) and (2) available transmit the transmission phase distribution in each of the array antenna unit interdigitated gap As shown in Figure 4. 根据图4的传输相位分布与图3所示的传输相位与所述指型缝隙单元中的第一横向缝隙宽度的对应关系图,获得传输阵列中每个所述指型缝隙单元中的第一横向缝隙的宽度《,从而完成该宽带传输阵列的设计,如图6所示;当馈源辐射的电磁波经过所述的宽带传输阵列天线时,每个所述指型缝隙单元中的第一横向缝隙的宽度通过公式(1)和传输相位曲线进行设计,即可对馈源辐射的电磁波进行相位补偿,将馈源辐射的球面波转换成平面波,从而实现高增益波束。 The corresponding relationship between the slit width of the lateral view of a first transmission phase of the transmission shown in FIG. 4 and FIG. 3 phase distribution of the finger slot type unit to obtain a first array of transmission-type slits in each of said finger units lateral width of the gap ", thereby completing the design of the array of broadband transmission, as shown in FIG. 6; when the feed passes through the electromagnetic wave radiated broadband transmission array antenna, a first transverse slot type of each of said finger units width of the slit by the equation (1) and the transmission phase curve designed to feed the electromagnetic radiation to be phase compensation to convert feed horn into a plane wave is a spherical wave, thereby realizing a high gain beam.

[0030] 如图5所示,该宽带传输阵列天线在中心频率13.58GHz的增益为21 . 2dB,在12.7GHz-16GHz频段内,该宽带传输阵列天线的增益大于20.2dB,相对于中心频率13.58GHz,该宽带传输阵列天线的IdB增益带宽为24%,同现有的传输阵列天线的IdB增益带宽小于10%相比,得到了显著性的提高,进而实现高增益波束。 [0030] As shown, the wideband transmission array antenna gain at the center frequency of 13.58GHz 5 to 21. 2dB, in 12.7GHz-16GHz band, the gain of the wideband array antenna transmission is greater than 20.2 dB, with respect to the center frequency 13.58 GHz, IdB gain bandwidth of the wideband array antenna transmission was 24%, with the conventional transmission array antenna IdB gain bandwidth compared to less than 10%, has been improved significantly, thereby achieving high gain beam.

[0031] 最后所应说明的是,以上实施例仅用以说明本发明的技术方案而非限制。 [0031] Finally, it should be noted that the above embodiments are intended to illustrate and not limit the present invention. 尽管参照实施例对本发明进行了详细说明,本领域的普通技术人员应当理解,对本发明的技术方案进行修改或者等同替换,都不脱离本发明技术方案的精神和范围,其均应涵盖在本发明的权利要求范围当中。 While the reference to the present invention, a detailed description of the embodiments, those of ordinary skill will appreciate, modifications to the technical solutions of the present invention, or equivalent replacements without departing from the spirit and scope of the technical solutions of the present invention, which should be encompassed by the present invention, among the scope of the claims.

Claims (4)

  1. 1. 一种基于三层金属平板的宽带传输阵列天线,其特征在于,将馈源辐射的球面波转换成平面波,从而实现高增益波束;所述宽带传输阵列天线包括三层金属平板,所述的金属平板的层与层之间呈平行关系,所述的每一层的金属平板都蚀刻了多个指型缝隙单元,并且所述的多个指型缝隙单元呈等间距排列在所述的金属平板的每一层上,其中,所述指型缝隙单元依次顺序包括:第一纵向缝隙,第二纵向缝隙,第三纵向缝隙,第四纵向缝隙和第五纵向缝隙,所述第一纵向缝隙,所述第二纵向缝隙,所述第三纵向缝隙,所述第四纵向缝隙和所述第五纵向缝隙之间相互平行,且关于所述第三纵向缝隙呈左右对称分布;所述指型缝隙单元还包括第一横向缝隙,所述第一横向缝隙垂直且穿过所述第一纵向缝隙,所述第二纵向缝隙,所述第三纵向缝隙,所述第四纵向 A broadband transmission array antenna based on three metal plates, wherein the feed horn converting spherical wave into a plane wave, in order to achieve high gain beam; transmitting said wideband array antenna comprising three metal plates, the form between the layers of flat metal plate in parallel relation, each layer of the metal plate are etched a plurality of slits interdigitated unit and the plurality of finger-type unit or the like as a slit arranged in the pitch each layer of the metal plate, wherein the finger-type sequential order slot unit comprises: a first longitudinal slot, a second longitudinal slot, the longitudinal slot of the third, fourth and fifth longitudinal slot longitudinal slit, the first longitudinal a gap between the parallel, the second longitudinal slot, said longitudinal slot of the third, the fourth and the fifth longitudinal slot each longitudinal slot, and with respect to the third longitudinal slits symmetrically distributed form; refers to the a first slit type unit further comprises a lateral slot, the first vertical transverse slot and through the first longitudinal slot, a second longitudinal slot, said third longitudinal slot, said fourth longitudinal 隙和所述第五纵向缝隙。 Gap and the fifth longitudinal slit.
  2. 2. 根据权利要求1所述的一种基于三层金属平板的宽带传输阵列天线,其特征在于,所述第二纵向缝隙的长度大于所述第一纵向缝隙的长度,所述第三纵向缝隙的长度大于所述第二纵向缝隙,所述第一纵向缝隙的长度与第五纵向缝隙的长度相同;所述第二纵向缝隙的长度与所述第四纵向缝隙的长度相同。 According to one of the claims 1 to broadband transmission based on the array antenna of the three metal plates, characterized in that the length of the second slot is greater than the longitudinal length of the first longitudinal slit, said third longitudinal slot the second length greater than the longitudinal slot, the same length as the longitudinal length of the first slot of the fifth longitudinal slit; the same length as the second longitudinal slit of the fourth longitudinal slit.
  3. 3. 根据权利要求1所述的一种基于三层金属平板的宽带传输阵列天线,其特征在于,所述的金属平板的层与层之间的间距为天线波长的四分之一。 According to claim 1, one of the broadband transmission of the array antenna based on three metal plates, wherein the spacing between the layers of the metal plate is a quarter wavelength antenna.
  4. 4. 根据权利要求1所述的一种基于三层金属平板的宽带传输阵列天线,其特征在于,第一横向缝隙的宽度是由所述指型缝隙单元的传输相位和所述指型缝隙单元的传输相位与所述第一横向缝隙宽度的关系曲线图共同确定;而所述指型缝隙单元的传输相位则通过公式(1)计算获得;其中,位于x〇y平面的所述的宽带传输阵列天线的第i个单元的传输相位为0(.^,),与辐射波束指向味.,爲:)、第1个传输单元的位置(1 1,71,〇)以及馈源的位置(%^, zf)的关系用公式(1)表示如下: According to one of the claims 1 based broadband transmission antenna array of three metal plates, wherein the transverse width of the first slit type transmission means by said phase means and said slot means a slit type unit the graph of the relationship between the transmission phase of said first lateral width of the slit is determined jointly; type transmission phase and said slot means is obtained by means of equation (1) is calculated; wherein said broad band transmission plane x〇y the i-th transmission phase array antenna unit is 0 (. ^), the radiation beam pointing flavor., :) is the first position of a transfer unit (1, 71, square) and a feed position ( % ^, zf) of the relationship (1) represented by the following formula:
    Figure CN106058445AC00021
    其中,k〇为自由空间中的波数,cU为馈源与第i个单元之间的距离。 Wherein k〇 the wave number in free space, the distance between the feed cU i-th unit.
CN 201610596425 2016-07-26 2016-07-26 Three-layer metal plate based broadband transmission array antenna CN106058445A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201789075U (en) * 2010-09-08 2011-04-06 国民技术股份有限公司 Radio frequency identification tag antenna device
WO2012139079A2 (en) * 2011-04-07 2012-10-11 Colburn Joseph S Tunable impedance surfaces
CN104868253A (en) * 2015-04-23 2015-08-26 中国科学院空间科学与应用研究中心 Metal flat lens antenna

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201789075U (en) * 2010-09-08 2011-04-06 国民技术股份有限公司 Radio frequency identification tag antenna device
WO2012139079A2 (en) * 2011-04-07 2012-10-11 Colburn Joseph S Tunable impedance surfaces
CN104868253A (en) * 2015-04-23 2015-08-26 中国科学院空间科学与应用研究中心 Metal flat lens antenna

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