WO2018076681A1 - 一种印刷偶极子振子 - Google Patents

一种印刷偶极子振子 Download PDF

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Publication number
WO2018076681A1
WO2018076681A1 PCT/CN2017/085856 CN2017085856W WO2018076681A1 WO 2018076681 A1 WO2018076681 A1 WO 2018076681A1 CN 2017085856 W CN2017085856 W CN 2017085856W WO 2018076681 A1 WO2018076681 A1 WO 2018076681A1
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WIPO (PCT)
Prior art keywords
dipole
dielectric plate
arm
parasitic element
disposed
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PCT/CN2017/085856
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English (en)
French (fr)
Inventor
马向军
李相众
江淑芬
刘伟强
Original Assignee
深圳国人通信股份有限公司
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Priority claimed from CN201610951127.0A external-priority patent/CN106410397A/zh
Priority claimed from CN201621175569.2U external-priority patent/CN206098701U/zh
Application filed by 深圳国人通信股份有限公司 filed Critical 深圳国人通信股份有限公司
Publication of WO2018076681A1 publication Critical patent/WO2018076681A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support

Definitions

  • the present invention relates to the field of mobile communication base station antennas, and in particular to a horizontally polarized printed dipole oscillator of an indoor dual-polarization ceiling series antenna.
  • Ceiling antennas are a common component of indoor coverage of mobile communication systems, and dual-polarization ceilings are a new trend for 4G-generation operators and a trend in the mainstream market.
  • MIMO multi-data stream technology
  • 4G systems which improves the capacity carrying capacity of air interfaces. Therefore, indoor coverage must also use multiple antennas, so the original indoor distribution system needs to be modified. Add one channel, you can install another antenna next to it, or you can replace the original single-polarized antenna with a dual-polarized antenna to reduce the damage to the indoor environment.
  • the existing printed dipole oscillators are not high in performance and large in size, and cannot meet the requirements for indoor coverage of 4G mobile communication systems.
  • An object of the present invention is to overcome the deficiencies of the above techniques and to provide a printed dipole oscillator having a high gain and a wide frequency band, which satisfies the requirements for indoor coverage of a 4G mobile communication system.
  • a printed dipole oscillator includes a dielectric plate, and further includes a feeding portion disposed in a middle portion of the dielectric plate and a plurality of dipole units disposed around the feeding portion to the dielectric plate,
  • Each of the dipole units includes a front vibrator arm and a reverse vibrator arm respectively disposed on a front surface and a reverse side of the dielectric plate, and the feeding portion feeds the front vibrator arm and the back surface vibrator arm.
  • front vibrator arm and the reverse vibrator arm of each of the dipole units respectively extend from the center of the dipole unit in opposite circumferential directions.
  • each of the dipole units on the dielectric plate is an axisymmetric pattern.
  • each of the lead parasitic element units is disposed to the dielectric plate, each of the lead parasitic element units being located radially outward of the corresponding dipole unit.
  • each of the lead parasitic element units is disposed on a front surface of the dielectric plate, and each end leading to the parasitic element unit extends from an center of the corresponding dipole unit toward an opposite circumferential direction.
  • each of the circumferential lengths leading to the parasitic oscillator unit is smaller than the circumferential length of each of the dipole units.
  • each of the reflective parasitic oscillator units being located radially outward of the feeding portion and located adjacent to the two dipoles Between subunits.
  • each of the reflective parasitic element units includes a body disposed to a front surface of the dielectric plate, the body extending substantially in a radial direction of the dielectric plate.
  • each of the reflective parasitic oscillator units further includes an L-shaped member disposed to a front surface of the dielectric plate, the L-shaped member including a first arm portion and a second arm portion, the first arm portion Mounted to the front side of the dielectric panel and coupled to a corresponding radially inner end of the body, the second arm being coupled to a radially inner end of the first arm and extending from the dielectric panel.
  • the power feeding part has a coaxial cable, and an inner core of the coaxial cable feeds the front vibrator arm, and an outer core of the coaxial cable feeds the back surface vibrator arm;
  • the front side of the dielectric plate is further provided with a balun structure for balancing the unbalance effect caused by the coaxial feed.
  • the invention has the advantages of simple structure, small volume, few components, easy production, high-gain, wide-band sexuality, a standing wave ratio of less than 1.5 in a 45% frequency range, and a frequency range spanning 1710 MHz-2690 MHz. , meet the requirements of indoor coverage of 4G mobile communication systems.
  • FIG. 1 is a perspective view of a printed dipole oscillator according to an embodiment of the invention.
  • FIG. 2 is a front elevational view of the printed dipole oscillator of FIG. 1; [0017] FIG.
  • FIG. 3 is a schematic rear view of the printed dipole oscillator of FIG. 1.
  • the present invention provides a printed dipole oscillator for a horizontally polarized portion of an indoor dual-polarized ceiling antenna of a 4G mobile communication system, including a dielectric board 10, A feed portion disposed to the middle of the dielectric plate 10 and a plurality of dipole units 21 disposed to the dielectric plate 10 around the feed portion are provided.
  • the dielectric plate 10 has a circular shape and is made of epoxy fiberglass plate with a dielectric constant of 4.4.
  • a plurality of dipole units 21 are provided to the dielectric sheet 10 by printing.
  • Each of the dipole units 21 includes a front side vibrator arm 22 and a reverse side vibrator arm 23 which are respectively disposed on the front side and the reverse side of the dielectric plate 10, and the power feeding unit feeds the front side vibrator arm 22 and the back side vibrator arm 23.
  • the front vibrator arm 22 and the reverse vibrator arm 23 of each dipole unit 21 extend from the center of the dipole unit 21 toward the opposite circumferential direction, respectively, and the projection on the dielectric plate 10 is an axisymmetric pattern.
  • the number of dipole units 21 is six, and is evenly spaced along the circumferential direction of the feeding portion of the dielectric plate 10.
  • the printed dipole oscillator of the present invention has a simple structure and has high gain and wide band performance, and its standing wave ratio is less than 1.5 in the 45% band.
  • the printed dipole oscillator of the present invention further includes a plurality of leading parasitic element units 30 disposed to the dielectric plate 10, each leading to the parasitic element unit 30 being located radially outward of the corresponding dipole unit 21.
  • the number of the parasitic element units 30 is six.
  • Each of the parasitic oscillator units 30 and the corresponding dipole unit 2 are parallel and passive, and the corresponding dipole unit 21 is guided, which expands the operating frequency broadband and enhances the corresponding even The radiant energy of the pole unit 21 thus increases the gain.
  • each of the leading parasitic element units 30 is disposed on the front surface of the dielectric plate 10, and each of the two ends of the parasitic element unit 30 is directed from the center of the corresponding dipole unit 21 toward the opposite circumferential direction. extend.
  • the circumferential length of each bow I to the parasitic oscillator unit 30 is smaller than the circumferential length of each dipole unit 21.
  • each circumferential length leading to the parasitic element unit 30 is 70% to 90% of the circumferential length of each dipole unit 21.
  • Each of the leading parasitic element units 30 is adjacent to the edge of the dielectric plate 10 and is parallel to the corresponding dipole unit 21.
  • the parasitic vibrator unit 30 is an arcuate strip structure parallel to the edge of the dielectric sheet 10.
  • the curved strip mechanism is made of copper foil.
  • the printed dipole oscillator of the present invention further includes a plurality of reflective parasitic oscillator units 40 disposed to the dielectric plate 10, Each of the reflective parasitic element units 40 is located radially outward of the feed portion and between the adjacent two dipole units 21. In this embodiment, the number of reflective parasitic element units 40 is six.
  • the reflective parasitic element unit 40 acts as a reflection, increasing the reflected energy of the dipole unit 21, which is beneficial for increasing the gain and reducing the standing wave ratio to some extent.
  • Each of the reflective parasitic element units 40 includes a main body 41 and an L-shaped member 42 disposed on the front surface of the dielectric sheet 10.
  • the main body 41 is close to the edge of the dielectric sheet 10.
  • the L-shaped member 42 is perpendicular to the front surface of the dielectric sheet 10.
  • the main body 41 has a square shape and is made of copper foil, and the main body 41 extends substantially in the radial direction of the dielectric plate 10.
  • the L-shaped part 42 is made of aluminum.
  • the L-shaped member 42 includes a first arm portion 421 and a second arm portion 422 which are mounted to the front surface of the dielectric sheet 10 and connected to the radially inner end of the corresponding body 41, preferably by riveting.
  • the second arm portion 422 is coupled to the radially inner end of the first arm portion 421 and protrudes from the dielectric plate 10. Steps 423 are formed on both sides of the second arm portion 422, respectively.
  • the power feeding portion includes a front power feeding portion 11 and a back surface power feeding portion 12 which are disposed on the front surface of the dielectric plate 10.
  • a plurality of front microstrip lines 13 are respectively connected to the two ends of the front feeding portion 11, and each of the front microstrip lines 13 is connected to the corresponding front vibrator arm 22, and a plurality of rear microstrip lines 14 are respectively connected to the two ends of the back feeding portion 12.
  • Each back microstrip line 14 is connected to the corresponding back oscillator arm 23.
  • the length of the front microstrip line 13 and the back microstrip line 14 are both 1/4 of the center frequency wavelength.
  • the front feeding portion 11 and the back feeding portion 12 are both approximately U-shaped strip structures, and the two vertical sides of the two U-shaped strip structures form the multi-steps 111, 121, respectively.
  • the two vertical sides of the two U-shaped strip structures form two steps 111, 121, respectively.
  • the centers of the lateral sides of the two U-shaped strip structures have projections 112, 122, respectively.
  • the power feeding portion has a coaxial cable, and the coaxial cable sequentially passes through the protrusions 112 of the back feeding portion 12, the dielectric plate 10, and the protrusion 112 of the front feeding portion 11, and the inner core of the coaxial cable is soldered to the front feed.
  • the projection 112 of the electric portion 11 feeds the front vibrator arm 22, and the outer core of the coaxial cable is soldered to the projection 122 of the back feed portion 12 to feed the back vibrator arm 23.
  • the dielectric plate 10 has a feed hole 15 through which a coaxial cable passes, and both ends of the feed hole 15 respectively penetrate the protrusion 112 of the front feed portion 11 and the protrusion 122 of the back feed portion 12. Therefore, in terms of electrical signal energy transmission on the front side of the dielectric panel 10, firstly, two portions are respectively transmitted from the feeding hole 15 to the two ends of the front feeding portion 11, respectively, and the front feeding portion 11 and the plurality of front microstrip lines 13 are The connection is divided into several parts and transmitted to the corresponding front vibrator arm 22 through the front microstrip line 13, so that each dipole unit 21 can obtain balanced energy distribution and can coordinate It also exerts excellent radiation effects.
  • the center of the dielectric plate 10 has a via hole 16 for passage of other polarized lines.
  • the dielectric plate 10 is further provided with four mounting holes 17, and four mounting holes 17 are evenly disposed along the circumferential direction of the dielectric plate 10, and are respectively adjacent to the corresponding front surface vibrator arms 22 for fixedly mounting the printed dipole oscillator of the present invention.
  • the front side of the dielectric plate 10 is provided with a balun structure 50 around the center of the dielectric plate 10, and the balun structure 50 is in contact with the front microstrip line 13 and located radially outward of the front feeding portion 11, the balun structure 50 With a center frequency of 1/2 length, the balun structure 50 can balance the unbalance effect of the coaxial feed.
  • the material of the balun structure 50 is copper foil. Since the length of the front microstrip line 13 is 1/4 of the center frequency wavelength, such that from the feed hole 15 to each dipole unit 21, it is necessary to pass a center frequency of 3/4, further making each dipole unit 21 can get a balanced energy distribution and can synergistically exert excellent radiation effects.
  • the structure of the present invention is simple, small in size, small in component parts, easy to produce, and has a gain of 2.5dBi and a frequency range of 1710MHZ to 2690 MHz.

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Abstract

本发明涉及一种印刷偶极子振子，包括介质板，还包括设置到所述介质板中部的馈电部以及环绕所述馈电部设置到介质板的若干偶极子单元，每个所述偶极子单元包括分别设置在介质板正面、反面的正面振子臂和反面振子臂，所述馈电部给正面振子臂和反面振子臂馈电。本发明结构简单，体积小，组成部件少，易于生产，具有高增益、宽频带的性能，在45%的频带范围内其驻波比小于1.5，能满足4G移动通信系统室内覆盖的要求。

Description

发明名称：一种印刷偶极子振子
技术领域
[0001] 本发明涉及移动通信基站天线领域， 具体的是涉及一种室内双极化吸顶系列天 线的水平极化的印刷偶极子振子。
背景技术
[0002] 吸顶天线是移动通信系统室内覆盖的常用部件， 双极化吸顶更是进入 4G吋代运 营商的新需求和主流市场的趋势。
[0003] 随着 4G吋代的到来， 4G系统上使用了多数据流技术 （MIMO) ， 提高了空口 的容量承载能力， 因此室内覆盖也必须使用多天线， 这样原来的室内分布系统 需要改造， 增加一路通道， 可以在旁边安装另一个天线， 也可以用双极化天线 替代原来的单极化天线， 减少对室内环境的破坏。 现有的印刷偶极子振子性能 不高， 体积较大， 无法满足 4G移动通信系统室内覆盖的要求。
技术问题
问题的解决方案
技术解决方案
[0004] 本发明的目的在于克服上述技术的不足， 提供一种具有高增益、 宽频带的印刷 偶极子振子， 满足了 4G移动通信系统室内覆盖的要求。
[0005] 本发明提供的一种印刷偶极子振子， 包括介质板， 还包括设置到所述介质板中 部的馈电部以及环绕所述馈电部设置到介质板的若干偶极子单元， 每个所述偶 极子单元包括分别设置在介质板正面、 反面的正面振子臂和反面振子臂， 所述 馈电部给正面振子臂和反面振子臂馈电。
[0006] 进一步地， 每个所述偶极子单元的正面振子臂和反面振子臂分别从偶极子单元 的中心朝相反的圆周方向延伸。
[0007] 进一步地， 每个所述偶极子单元在所述介质板上的投影为轴对称图形。
[0008] 进一步地， 还包括若干设置到所述介质板的引向寄生振子单元， 每个所述引向 寄生振子单元位于对应偶极子单元的径向外侧。 [0009] 进一步地， 每个所述引向寄生振子单元设置在所述介质板的正面， 且每个引向 寄生振子单元的两端从对应偶极子单元的中心朝相反的圆周方向延伸。
[0010] 进一步地， 每个所述引向寄生振子单元的周向长度小于每个所述偶极子单元的 周向长度。
[0011] 进一步地， 还包括若干设置到所述介质板的反射寄生振子单元， 每个所述反射 寄生振子单元位于所述馈电部的径向外侧并位于相邻的两个所述偶极子单元之 间。
[0012] 进一步地， 每个所述反射寄生振子单元包括设置到所述介质板正面的主体， 所 述主体基本上沿所述介质板的径向延伸。
[0013] 进一步地， 每个所述反射寄生振子单元还包括设置到所述介质板正面的 L型部 件， 所述 L型部件包括第一臂部和第二臂部， 所述第一臂部安装到所述介质板的 正面并与对应的所述主体的径向内端连接， 所述第二臂部连接到所述第一臂部 的径向内端并伸出于所述介质板。
[0014] 进一步地， 所述馈电部具有同轴电缆， 所述同轴电缆的内芯给所述正面振子臂 馈电， 所述同轴电缆的外芯给所述反面振子臂馈电； 所述介质板的正面还设有 巴伦结构用于平衡所述同轴馈电带来的不平衡效应。
发明的有益效果
有益效果
[0015] 本发明结构简单， 体积小， 组成部件少， 易于生产， 具有高增益、 宽频带的性 育 ， 在 45%的频带范围内其驻波比小于 1.5， 频率范围横跨 1710MHz-2690 MHz， 满足了 4G移动通信系统室内覆盖的要求。
对附图的简要说明
附图说明
[0016] 图 1为本发明一实施例提供的一种印刷偶极子振子的立体示意图；
[0017] 图 2是图 1所示印刷偶极子振子的正面示意图；
[0018] 图 3是图 1所示印刷偶极子振子的背面示意图。 本发明的实施方式
[0019] 下面结合附图和实施例对本发明作进一步的描述。
[0020] 参考图 1、 图 2和图 3， 本发明提供的一种印刷偶极子振子， 用于 4G移动通信系 统的室内双极化吸顶天线的水平极化部分， 包括介质板 10、 设置到介质板 10中 部的馈电部以及环绕馈电部设置到介质板 10的若干偶极子单元 21。 介质板 10的 形状为圆形， 材质为环氧树脂玻璃纤维板， 介电常数为 4.4。 若干偶极子单元 21 通过印刷的方式设置到介质板 10。
[0021] 每个偶极子单元 21包括分别设置在介质板 10正面、 反面的正面振子臂 22和反面 振子臂 23， 馈电部给正面振子臂 22和反面振子臂 23馈电。 每个偶极子单元 21的 正面振子臂 22和反面振子臂 23分别从偶极子单元 21的中心朝相反的圆周方向延 伸， 且在介质板 10上的投影为轴对称图形。 本实施例中， 偶极子单元 21的数量 为六个， 并沿介质板 10馈电部的周向均匀间隔设置。 本发明的的印刷偶极子振 子结构简单， 同吋具有高增益、 宽频带的性能， 在 45%的频带范围内其驻波比小 于 1.5。
[0022] 本发明的印刷偶极子振子还包括若干设置到介质板 10的引向寄生振子单元 30， 每个引向寄生振子单元 30位于对应偶极子单元 21的径向外侧。 本实施例中， 引 向寄生振子单元 30的数量为六个。 每个引向寄生振子单元 30与对应偶极子单元 2 1相互平行且是无源的寄生振子单元， 对对应偶极子单元 21起到引向作用， 拓展 了工作频率宽带， 增强了对应偶极子单元 21的辐射能量从而提高增益。
[0023] 本实施例中， 每个引向寄生振子单元 30设置在介质板 10的正面， 且每个引向寄 生振子单元 30的两端从对应偶极子单元 21的中心朝相反的圆周方向延伸。 每个 弓 I向寄生振子单元 30的周向长度小于每个偶极子单元 21的周向长度。 优选地， 每个引向寄生振子单元 30的周向长度是每个偶极子单元 21的周向长度的 70%至 90 。
[0024] 每个引向寄生振子单元 30靠近介质板 10的边缘并与对应偶极子单元 21平行。 引 向寄生振子单元 30为一弧形带状结构， 弧形带状机构平行于介质板 10的边缘。 弧形带状机构的材质为铜箔。
[0025] 本发明的印刷偶极子振子还包括若干设置到介质板 10的反射寄生振子单元 40， 每个反射寄生振子单元 40位于馈电部的径向外侧并位于相邻的两个偶极子单元 2 1之间。 本实施例中， 反射寄生振子单元 40的数量为六个。 反射寄生振子单元 40 起到反射作用， 增大了偶极子单元 21的反射能量， 即有益于提高增益， 又在一 定程度上降低了驻波比。
[0026] 每个反射寄生振子单元 40包括设置在介质板 10正面的主体 41和 L型部件 42。 主 体 41靠近介质板 10的边缘。 L型部件 42垂直于介质板 10的正面。 主体 41的形状为 方形， 材质为铜箔， 主体 41基本上沿介质板 10的径向延伸。 L型部件 42材质的为 铝材质。 L型部件 42包括第一臂部 421和第二臂部 422， 第一臂部 421安装到介质 板 10的正面并与对应的主体 41的径向内端连接， 连接方式优选为铆接。 第二臂 部 422连接到第一臂部 421的径向内端并伸出介质板 10。 第二臂部 422的两侧分别 形成有台阶 423。
[0027] 馈电部包括设置在介质板 10正面的正面馈电部 11和背面馈电部 12。 正面馈电部 11的两端分别连接有若干正面微带线 13， 每个正面微带线 13连接到对应正面振 子臂 22， 背面馈电部 12的两端分别连接有若干背面微带线 14， 每个背面微带线 1 4连接到对应背面振子臂 23。 正面微带线 13和背面微带线 14的长度都为 1/4的中心 频率波长。
[0028] 正面馈电部 11和背面馈电部 12均为近似 U型的带状结构， 两个 U型的带状结构 的两个竖边分别形成多级台阶 111、 121。 本实施例中， 两个 U型的带状结构的两 个竖边分别形成两级台阶 111、 121。 两个 U型的带状结构的横边的中心分别具有 凸起 112、 122。 馈电部具有同轴电缆， 同轴电缆依次穿过背面馈电部 12的凸起 1 22、 介质板 10和正面馈电部 11的凸起 112， 且同轴电缆的内芯焊接到正面馈电部 11的凸起 112， 从而给正面振子臂 22馈电， 同轴电缆的外芯焊接到背面馈电部 12 的凸起 122， 从而给背面振子臂 23馈电。
[0029] 介质板 10具有供同轴电缆穿过的馈电孔 15， 馈电孔 15的两端分别贯穿正面馈电 部 11的凸起 112和背面馈电部 12的凸起 122。 因而介质板 10正面的电信号能量传 输方面， 首先从馈电孔 15处均分为两份分别向正面馈电部 11的两端传输， 在正 面馈电部 11与若干正面微带线 13的连接处均分若干份， 通过正面微带线 13传输 给对应的正面振子臂 22， 使每个偶极子单元 21都能得到均衡的能量分配且能协 同发挥出优良的辐射效应。
[0030] 介质板 10的中心具有过线孔 16， 用于其它极化的线路通过。 介质板 10上还设有 四个安装孔 17， 四个安装孔 17沿介质板 10周向均匀设置， 并分别靠近对应的正 面振子臂 22， 用于固定安装本发明的印刷偶极子振子。
[0031] 介质板 10的正面围绕介质板 10的中心设有巴伦结构 50， 巴伦结构 50与正面微带 线 13接触， 且位于正面馈电部 11的径向外侧， 巴伦结构 50的长度为 1/2的中心频 率波长， 巴伦结构 50可以平衡同轴馈电带来的不平衡效应。 巴伦结构 50的材质 为铜箔。 由于正面微带线 13的长度为 1/4的中心频率波长， 这样从馈电孔 15到每 个偶极子单元 21都需经过 3/4的中心频率波长， 进一步使得每个偶极子单元 21都 能得到均衡的能量分配且能协同发挥出优良的辐射效应。
[0032] 本发明的结构简单， 体积小， 组成部件少， 易于生产， 增益为 2.5dBi， 频率范 围横跨 1710MHZ-2690 MHz。
[0033] 以上实施例仅表达了本发明的优选实施方式， 其描述较为具体和详细， 但并不 能因此而理解为对本发明专利范围的限制。 应当指出的是， 对于本领域的普通 技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干变形和改进， 如对各个实施例中的不同特征进行组合等， 这些都属于本发明的保护范围。

Claims

权利要求书
一种印刷偶极子振子， 包括介质板， 其特征在于， 还包括设置到所述 介质板中部的馈电部以及环绕所述馈电部设置到介质板的若干偶极子 单元， 每个所述偶极子单元包括分别设置在介质板正面、 反面的正面 振子臂和反面振子臂， 所述馈电部给正面振子臂和反面振子臂馈电。 .根据权利要求 1所述的印刷偶极子振子， 其特征在于， 每个所述偶极 子单元的正面振子臂和反面振子臂分别从偶极子单元的中心朝相反的 圆周方向延伸。
根据权利要求 2所述的印刷偶极子振子， 其特征在于， 每个所述偶极 子单元在所述介质板上的投影为轴对称图形。
根据权利要求 2所述的印刷偶极子振子， 其特征在于， 还包括若干设 置到所述介质板的引向寄生振子单元， 每个所述引向寄生振子单元位 于对应偶极子单元的径向外侧。
根据权利要求 4所述的印刷偶极子振子， 其特征在于， 每个所述引向 寄生振子单元设置在所述介质板的正面， 且每个引向寄生振子单元的 两端从对应偶极子单元的中心朝相反的圆周方向延伸。
根据权利要求 5所述的印刷偶极子振子， 其特征在于， 每个所述引向 寄生振子单元的周向长度小于每个所述偶极子单元的周向长度。 根据权利要求 2所述的印刷偶极子振子， 其特征在于， 还包括若干设 置到所述介质板的反射寄生振子单元， 每个所述反射寄生振子单元位 于所述馈电部的径向外侧并位于相邻的两个所述偶极子单元之间。 根据权利要求 7所述的印刷偶极子振子， 其特征在于， 每个所述反射 寄生振子单元包括设置到所述介质板正面的主体， 所述主体基本上沿 所述介质板的径向延伸。
根据权利要求 8所述的印刷偶极子振子， 其特征在于， 每个所述反射 寄生振子单元还包括设置到所述介质板正面的 L型部件， 所述 L型部 件包括第一臂部和第二臂部， 所述第一臂部安装到所述介质板的正面 并与对应的所述主体的径向内端连接， 所述第二臂部连接到所述第一 臂部的径向内端并伸出于所述介质板。
[权利要求 10] 根据权利要求 1所述的印刷偶极子振子， 其特征在于， 所述馈电部具 有同轴电缆， 所述同轴电缆的内芯给所述正面振子臂馈电， 所述同轴 电缆的外芯给所述反面振子臂馈电； 所述介质板的正面还设有巴伦结 构用于平衡所述同轴馈电带来的不平衡效应。
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