WO2016180183A1 - 一种宽带天线 - Google Patents

一种宽带天线 Download PDF

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Publication number
WO2016180183A1
WO2016180183A1 PCT/CN2016/079669 CN2016079669W WO2016180183A1 WO 2016180183 A1 WO2016180183 A1 WO 2016180183A1 CN 2016079669 W CN2016079669 W CN 2016079669W WO 2016180183 A1 WO2016180183 A1 WO 2016180183A1
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Prior art keywords
patch
disc
antenna
mobile terminal
component
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PCT/CN2016/079669
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English (en)
French (fr)
Inventor
张琦
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中兴通讯股份有限公司
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Publication of WO2016180183A1 publication Critical patent/WO2016180183A1/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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching

Definitions

  • the present application relates to, but is not limited to, the field of wireless communication technologies, and in particular, to a wideband antenna for a mobile terminal.
  • the methods for realizing the broadband of the antenna mainly include: a dielectric substrate using a special material, an additional impedance matching network, an antenna loading, an optimization algorithm, a multi-layer dielectric substrate, and a coplanar parasitic patch.
  • the above methods often have the following problems: the design is difficult to implement, and the improvement is small.
  • a dielectric substrate using a special material has a high production cost, and the maximum bandwidth obtained is often only about 10% of the resonant frequency; an additional impedance matching network is complicated in structure, and the maximum bandwidth obtained is often only about the resonant frequency. 30%.
  • the embodiment of the invention provides a broadband antenna.
  • the resonance characteristics and impedance matching of the antenna can be adjusted, the double resonance is formed to broaden the bandwidth, and the structure is simple and easy to implement.
  • An embodiment of the present invention provides a broadband antenna for a mobile terminal, including a grounding component, a disk patch, at least one shorting probe, and a signal feeding component;
  • the disc patch has a slot
  • the disc patch is connected to the grounding component by the at least one shorting probe, and the disc patch passes through the signal feeding component and the The mobile terminal is connected, and the signal feeding component is connected to the grounding component.
  • the slot is a ring groove
  • the ring groove divides the disk patch into mutually independent first disk patches and ring patches, and the first disk patch Feeding components through the signal
  • the mobile terminal is connected, and the ring patch is connected to the grounding component through the at least one shorting probe.
  • the slot is a U-shaped slot.
  • a center point of the disc patch is connected to the mobile terminal through the signal feeding component.
  • the signal feeding component is a coaxial line
  • the outer layer is connected to the grounding component
  • the middle is a dielectric layer
  • the inner layer is a feeding copper core
  • one end is connected with the disk patch
  • the other end is connected. Connected to the mobile terminal.
  • the material of the disc patch is a single-sided copper-clad printed circuit board.
  • the annular groove has a slit width of 1 mm
  • the first disc patch has a diameter of 8 mm
  • the annular patch has an inner diameter of 10 mm and an outer diameter of 20 mm.
  • the broadband antenna of the embodiment of the present invention can adjust the resonance characteristics and impedance matching of the antenna by slotting the disk patch and using the short-circuit probe to form a double resonance and widen the bandwidth, that is, the relative bandwidth can reach 63.2%, and realize The antenna has a large gain in the horizontal plane.
  • the wideband antenna according to the embodiment of the present invention can be miniaturized by using a low profile structure, and can be used on Wi-Fi and high frequency antennas of mobile terminals such as routers, automobiles, and televisions.
  • FIG. 1 is a front elevational view showing a broadband antenna according to an embodiment of the present invention
  • FIG. 2 is a cross-sectional view showing a wideband antenna according to an embodiment of the present invention.
  • FIG. 3 is a graph showing an S11 parameter of a wideband antenna according to an embodiment of the present invention.
  • FIG. 4 is a diagram showing a voltage standing wave ratio (VSWR) of a wideband antenna according to an embodiment of the present invention
  • Figure 5 is a diagram showing a normalized pattern of a wideband antenna according to an embodiment of the present invention.
  • Figure 6 is a diagram showing the gain of a wideband antenna at an angle of 60° according to an embodiment of the present invention.
  • Figure 7 shows the S11 of the wideband antenna of Figure 1 in the case of shorted probes having different radii R Parameter curve diagram
  • Figure 8 is a graph showing an S11 parameter of the wideband antenna of Figure 1 in the case of a first disc patch having different diameters D center ;
  • Figure 9 is a graph showing the S11 parameter of the broadband antenna of Figure 1 in the case of a ring patch having different outer diameters D outer ;
  • Figure 10 is a graph showing the S11 parameter of the wideband antenna of Figure 1 with different slot widths SLOT_W;
  • Figure 11 is a front elevational view showing a broadband antenna according to another embodiment of the present invention.
  • Figure 12 is a cross-sectional view showing a wideband antenna according to another embodiment of the present invention.
  • Figure 13 is a graph showing an S11 parameter of a wideband antenna according to another embodiment of the present invention.
  • Figure 14 is a schematic view showing an ordinary rectangular patch antenna and its equivalent circuit diagram
  • Fig. 15 is a view showing a schematic diagram of a rectangular patch antenna with a U-shaped groove and an equivalent circuit diagram thereof.
  • an embodiment of the present invention provides a broadband antenna for a mobile terminal, including a grounding component 1, a disk patch 2, at least one shorting probe 3, and a signal feeding component 4;
  • the grounding component 1 is used for grounding, and the disk patch 2 has a slot 5, and the disk patch 2 is connected to the grounding component 1 through the at least one shorting probe 3.
  • the disc patch 2 is connected to the mobile terminal via the signal feed assembly 4, and the signal feed assembly 4 is connected to the ground assembly 1.
  • the disc patch 2 is for transmitting a radio frequency signal, and the signal feeding component 4 is for feeding a signal into the radiating portion.
  • the slots 5 are annular grooves 51, and the number of the shorting probes 3 is four. Due to the presence of the annular groove 51, the disc patch 2 is divided into mutually independent first disc patches 21 and annular patches 22, the disc patch 2 and the first circle
  • the disk patch 21 is a concentric circle structure, and the first disk patch 21 is connected to the mobile terminal through the signal feeding component 4, and the ring patch 22 passes through the four shorting probes 3 Connected to the grounding component 1.
  • the center point of the disc patch 2 or the first disc patch 21 is connected to the mobile terminal through the signal feeding component 4, and the outer diameter edge of the ring patch 22 passes
  • the four shorting probes 3 are respectively connected to the grounding component 1 to adjust the resonance characteristics.
  • the material of the disc patch is a single-sided copper-clad printed circuit board.
  • the signal feeding component 4 is, for example, a coaxial line, the outer layer is connected to the grounding component 1, the middle is a dielectric layer, the inner layer is a feeding copper core, one end is connected to the disk patch 2, and the other end is connected. Connected to the mobile terminal.
  • the number of the short-circuit probes is not limited in the embodiment of the present invention. In addition to the four in FIG. 1, two or three may be used, which may be determined according to actual needs. Moreover, the embodiment of the present invention does not limit the shape of the slot. In addition to the annular groove in FIG. 1, it may be elliptical, square, U-shaped, etc., and may be selected according to requirements.
  • the broadband antenna of the embodiment of the present invention can adjust the resonance characteristics and impedance matching of the antenna by slotting the disk patch and using the short-circuit probe, forming a double resonance to widen the bandwidth, and the structure is simple and easy to implement.
  • the embodiments of the present invention are further described in detail below through a specific embodiment.
  • the antenna structure can be seen in FIG. 1 and FIG. 2.
  • the wideband antenna is fabricated on the basis of a low profile body having a diameter of D GND and a height of H, and removing the empty surface of the top surface thereof.
  • the cavity is a single-sided copper-clad printed circuit board.
  • the diameter D GND of the low profile body is 100 millimeters (mm), the height H is 8 mm, the diameter D center of the first disk patch 21 is 8 mm, and the inner diameter D inner of the ring patch 22 is 10 mm.
  • the diameter D outer is 20 mm, and the slit width Slot_W of the annular groove 51 is 1 mm, as shown in Table 1.
  • the center point of the first disk patch 21 is connected to a mobile terminal through the signal feeding component 4, and the outer diameter edge of the ring patch 22 is respectively connected to the grounding component 1 through the four shorting probes 3,
  • the short-circuit probe 3 has a radius R and a height H (8 mm).
  • the disc patch and the grounding plate are also A single-sided copper-clad printed circuit board is used, and in order to minimize its effect on antenna performance, an optional medium having a relative dielectric constant of 2.6 is used.
  • simulation is performed by using HFSS simulation software (three-dimensional electromagnetic simulation software), and the obtained simulation results are shown in FIG. 3, FIG. 4, FIG. 5 and FIG.
  • the center frequency Freq of the broadband antenna is 2.5 GHz
  • the impedance band of the broadband antenna is from 1.92 to 3.5 GHz when the return loss is S11 ⁇ -10 dB. It reached 63.2% and the improvement was large.
  • the broadband antenna satisfies the VSWR ⁇ 2.0 in the frequency band from 1.62 to 3.64 GHz, that is, the wideband antenna satisfies the requirements of the basic antenna. .
  • the wideband antenna of the embodiment of the present invention can effectively broaden the bandwidth, that is, the relative bandwidth can reach 63.2%, and realize that the antenna has a large gain in the horizontal plane.
  • the wideband antenna of the embodiment of the present invention can adopt a low profile structure and achieve miniaturization, and can be used on Wi-Fi and high frequency antennas of mobile terminals such as routers, vehicles, and televisions.
  • antenna size shown in Table 1 is only an optional manner of the embodiment of the present invention, and does not limit the present application.
  • the broadband antenna shown in FIG. 1 is given a short-circuit probe having different radii R, a first disc patch of different diameters D center , and different S11 parameter graph for the outer ring D outer ring patch and the different slot width SLOT_W.
  • the change of the outer diameter D outer of the annular patch mainly affects the low frequency resonance point of the broadband antenna, and as the D outer increases, the position of the low frequency resonance point of the broadband antenna changes.
  • the slot width Slot_W of the ring groove mainly affects the resonant strength of the wideband antenna.
  • an embodiment of the present invention further provides a broadband antenna, including a grounding component 1, a disk patch 2, four shorting probes 3, and a signal feeding component 4; wherein the disk
  • the patch 2 has a U-shaped slot 52, and the center point of the disc patch 2 is connected to the mobile terminal through the signal feeding component 4, and the edge of the disc patch 2 passes through the four The shorting probes 3 are respectively connected to the grounding assembly 1.
  • the wideband antenna in FIG. 11 adopts a U-shaped slot for changing the current flow direction of the disk patch surface to achieve the purpose of widening the bandwidth.
  • the simulation is performed using the HFSS simulation software, wherein the diameter D GND of the low profile body is 100 mm, and the diameter Dpatch of the disk patch 2 is 20 mm, the U The groove height W of the groove is 9.6 mm, the groove length L is 12.4 mm, the groove wall thickness b is 1 mm, and the groove bottom thickness c is 1 mm.
  • the obtained S11 parameter curve is shown in FIG. 13, and it can be seen that the center frequency of the broadband antenna is 2.4 GHz, and when the return loss S11 ⁇ -10 dB, the impedance band of the broadband antenna is From 2.08 to 2.72 GHz, the relative bandwidth has reached 27%, meeting the requirements of broadband antennas.
  • the U-shaped slot is taken as an example to introduce the reason why the slot can widen the bandwidth.
  • FIG. 14 shows a schematic diagram of an ordinary rectangular patch antenna and an equivalent circuit diagram thereof
  • FIG. 15 shows a schematic diagram of a rectangular patch antenna with a U-shaped slot and an equivalent circuit diagram thereof.
  • the ordinary rectangular patch antenna can be equivalent to a simple LC resonant circuit
  • the current I flows out from the feeding point Q, flows along the patch to the radiating side, and the inductance in the equivalent LC resonant loop.
  • the value of L and capacitor C depends on the path length of the current flowing along the patch toward the radiant side.
  • the equivalent circuit After having a U-shaped groove on a rectangular patch, as shown in Figure 15, the equivalent circuit will change.
  • the current flowing in the middle of the rectangular patch has almost no change in the current direction and path.
  • the equivalent LC resonant circuit in this part remains basically unchanged, that is, a resonance point still appears at the original resonant frequency.
  • the current will flow along the edge of the U-shaped groove, causing the path to increase accordingly.
  • Reacting to the equivalent circuit is equivalent to adding a part of the series inductance ⁇ L S That is, the equivalent circuit of this part adds a series inductance to the LC resonant circuit.
  • the equivalent circuit is changed from the original single resonant loop to the double resonant loop, and two resonance points appear.
  • the two resonance points can be connected together to form a wide frequency band.
  • the embodiment of the invention provides a broadband antenna, which can adjust the resonance characteristics and impedance matching of the antenna, form double resonance and widen the bandwidth, and the structure is simple and easy to implement.

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Abstract

一种宽带天线，用于一移动终端，包括接地组件、圆盘贴片、至少一个短路探针和信号馈入组件；其中，所述圆盘贴片上具有开槽，所述圆盘贴片通过所述至少一个短路探针与所述接地组件连接，所述圆盘贴片通过所述信号馈入组件与所述移动终端连接，所述信号馈入组件与所述接地组件连接。上述宽带天线，通过在圆盘贴片上开槽和使用短路探针，能够调节天线的谐振特性和阻抗匹配，形成双谐振从而展宽带宽，且结构简单易实现。

Description

一种宽带天线 技术领域
本申请涉及但不限于无线通信技术领域，特别是涉及一种用于移动终端的宽带天线。
背景技术
相关技术中，实现天线宽频带的方法主要有：采用特殊材料的介质基片、附加阻抗匹配网络、天线加载、优化算法、采用多层介质基片以及共面寄生贴片等。
但上述方法常存在如下问题：设计复杂不易实现，且改善幅度小。例如，采用特殊材料的介质基片，生产成本较高，而得到的最大带宽往往仅约谐振频率的10％；附加阻抗匹配网络，结构复杂不易实现，而得到的最大带宽往往仅约谐振频率的30％。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本发明实施例提供一种宽带天线，通过在圆盘贴片上开槽和使用短路探针，能够调节天线的谐振特性和阻抗匹配，形成双谐振从而展宽带宽，且结构简单易实现。
本发明实施例提供一种宽带天线，用于一移动终端，包括接地组件、圆盘贴片、至少一个短路探针和信号馈入组件；
其中，所述圆盘贴片上具有开槽，所述圆盘贴片通过所述至少一个短路探针与所述接地组件连接，所述圆盘贴片通过所述信号馈入组件与所述移动终端连接，所述信号馈入组件与所述接地组件连接。
可选地，所述开槽为圆环槽，所述圆环槽将所述圆盘贴片分割为相互独立的第一圆盘贴片和圆环贴片，所述第一圆盘贴片通过所述信号馈入组件与 所述移动终端连接，所述圆环贴片通过所述至少一个短路探针与所述接地组件连接。
可选地，所述开槽为U型槽。
可选地，所述圆盘贴片的中心点通过所述信号馈入组件与所述移动终端连接。
可选地，所述信号馈入组件是一个同轴线，外层与所述接地组件连接，中间是介质层，内层是馈电铜芯，一端与所述圆盘贴片连接，另一端与所述移动终端连接。
可选地，所述圆盘贴片的材料采用单面覆铜的印刷电路板。
可选地，所述圆环槽的缝隙宽度为1毫米(mm)，所述第一圆盘贴片的直径为8mm，所述圆环贴片的内径为10mm且外径为20mm。
通过本发明实施例的上述技术方案，本发明实施例的有益效果在于：
本发明实施例的宽带天线，通过在圆盘贴片上开槽和使用短路探针，能够调节天线的谐振特性和阻抗匹配，形成双谐振从而展宽带宽，即相对带宽可达到63.2％，且实现天线在水平面内有较大的增益。而且，本发明实施例的宽带天线可采用低剖面结构，实现小型化，可以在路由器、车载、电视等移动终端的Wi-Fi和高频天线上使用。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1表示本发明一实施例的宽带天线的正面示意图；
图2表示本发明一实施例的宽带天线的剖面示意图；
图3表示本发明一实施例的宽带天线的S11参数曲线图；
图4表示本发明一实施例的宽带天线的电压驻波比(VSWR)图；
图5表示本发明一实施例的宽带天线的归一化方向图；
图6表示本发明一实施例的宽带天线在角度60°上的增益图；
图7表示图1中的宽带天线在具有不同半径R的短路探针的情况下的S11 参数曲线图；
图8表示图1中的宽带天线在具有不同直径Dcenter的第一圆盘贴片的情况下的S11参数曲线图；
图9表示图1中的宽带天线在具有不同外径Douter的圆环贴片的情况下的S11参数曲线图；
图10表示图1中的宽带天线在具有不同的开槽宽度SLOT_W的情况下的S11参数曲线图；
图11表示本发明另一实施例的宽带天线的正面示意图；
图12表示本发明另一实施例的宽带天线的剖面示意图；
图13表示本发明另一实施例的宽带天线的S11参数曲线图；
图14表示普通矩形贴片天线示意图及其等效电路图；
图15表示加U型槽的矩形贴片天线示意图及其等效电路图。
本发明的实施方式
下面将结合附图对具体实施例进行详细描述。
参见图1、图2所示，本发明实施例提供一种宽带天线，用于一移动终端，包括接地组件1、圆盘贴片2、至少一个短路探针3和信号馈入组件4；
其中，所述接地组件1用于接地，所述圆盘贴片2上具有开槽5，所述圆盘贴片2通过所述至少一个短路探针3与所述接地组件1连接，所述圆盘贴片2通过所述信号馈入组件4与所述移动终端连接，所述信号馈入组件4与所述接地组件1连接。其中，所述圆盘贴片2用于发射射频信号，所述信号馈入组件4用于将信号馈入辐射部分。
在图1中，所述开槽5为圆环槽51，所述短路探针3的数量为4个。由于所述圆环槽51的存在，将所述圆盘贴片2分割为相互独立的第一圆盘贴片21和圆环贴片22，所述圆盘贴片2和所述第一圆盘贴片21为同心圆结构，且所述第一圆盘贴片21通过所述信号馈入组件4与所述移动终端连接，所述圆环贴片22通过所述4个短路探针3与所述接地组件1连接。
其中，所述圆盘贴片2或所述第一圆盘贴片21的中心点通过所述信号馈入组件4与所述移动终端连接，而所述圆环贴片22的外径边缘通过所述4个短路探针3分别与所述接地组件1连接，以调节谐振特性。所述圆盘贴片的材料采用单面覆铜的印刷电路板。
所述信号馈入组件4例如是一个同轴线，外层与所述接地组件1连接，中间是介质层，内层是馈电铜芯，一端与所述圆盘贴片2连接，另一端与所述移动终端连接。
需要指出的是，本发明实施例并不限定所述短路探针的个数，除了图1中的4个，也可以为2个或3个，可依实际需求决定。并且，本发明实施例也不限定所述开槽的形状，除了图1中的圆环槽，也可以是椭圆形、方形、U型等等，可依需求进行选择。
本发明实施例的宽带天线，通过在圆盘贴片上开槽和使用短路探针，能够调节天线的谐振特性和阻抗匹配，形成双谐振从而展宽带宽，且结构简单易实现。
下面通过一具体实施例对本发明实施例作进一步的详细描述，天线结构可参见图1、图2所示。
在本发明具体实施例中，所述宽带天线是在低剖面体的基础上制作的，所述低剖面体是直径为DGND，高度为H的圆柱形，且去掉其顶部圆形表面的空腔，采用单面覆铜的印刷电路板。
其中，所述低剖面体的直径DGND为100毫米(mm)，高度H为8mm，第一圆盘贴片21的直径Dcenter为8mm，圆环贴片22的内径Dinner为10mm，外径Douter为20mm，圆环槽51的缝隙宽度Slot_W为1mm，详见表1。
H Dcenter Dinner Slot_W Douter DGND
8mm 8mm 10mm 1mm 20mm 100mm
表1
所述第一圆盘贴片21的中心点通过信号馈入组件4与一移动终端连接，所述圆环贴片22的外径边缘通过4个短路探针3分别与接地组件1连接，所述短路探针3的半径为R，高度为H(8mm)。而所述圆盘贴片和接地板也 采用单面覆铜的印刷电路板，且为了尽量减小其对天线性能的影响，可选的相对介电常数为2.6的介质。
为了确定本发明具体实施例的宽带天线的性能，利用HFSS仿真软件(三维电磁仿真软件)进行仿真，得到的仿真结果参见图3、图4、图5及图6。
从图3的S11参数曲线图可以得知：所述宽带天线的中心频率Freq为2.5GHz，在回波损耗S11<﹣10dB时，所述宽带天线的阻抗频带为从1.92到3.5GHz，相对带宽达到了63.2％，改善幅度大。
从图4的VSWR(Voltage Standing Wave Ratio，电压驻波比)图可以得知：在从1.62到3.64GHz的频带内，所述宽带天线满足VSWR<2.0，即所述宽带天线满足基本天线的要求。
从图5的归一化方向图和图6的在角度60°上的增益图可以得知：工作频带内方向图没有发生畸变且在60°的角度上有较大的辐射能量，增益大于-1dB。
由上述内容可知：本发明实施例的宽带天线能够有效地展宽带宽，即相对带宽可达到63.2％，并且实现天线在水平面内有较大的增益。而且，本发明实施例的宽带天线可采用低剖面结构，实现小型化，可以在路由器、车载、电视等移动终端的Wi-Fi和高频天线上。
需要指出的是，表1所示的天线尺寸，只是本发明实施例的一种可选方式，并不能限制本申请。
此外，参见图7、图8、图9及图10所示，给出了图1所示的宽带天线在具有不同半径R的短路探针、不同直径Dcenter的第一圆盘贴片、不同外径Douter的圆环贴片及不同的开槽宽度SLOT_W的情况下的S11参数曲线图。
从图7可以看出，当短路探针的半径R变大时，所述宽带天线的工作频率整体右移，即所述短路探针的半径R的变化影响天线的谐振频率；从图8可以看出，当第一圆盘贴片的直径Dcenter变大时，所述宽带天线的低频谐振点和高频谐振点有靠近的趋势，即通过改变Dcenter可调节宽带天线的谐振特性，以形成宽频带；从图9可以看出，圆环贴片的外径Douter的变化主要影响宽带天线的低频谐振点，且随着Douter的增大，宽带天线的低频谐振点的位置 变化较大，而对其它两个低频谐振点的影响较小；从图10可以看出，圆环槽的缝隙宽度Slot_W主要影响的是宽带天线的谐振强度。
这样，基于上述的变化情况，在制作本发明实施例的宽带天线时，可进行不同的选择以得到最优的适合应用的宽带天线。
参见图11、图12所示，本发明实施例还提供一种宽带天线，包括接地组件1、圆盘贴片2、4个短路探针3和信号馈入组件4；其中，所述圆盘贴片2上具有U型槽52，且所述圆盘贴片2的中心点通过所述信号馈入组件4与所述移动终端连接，所述圆盘贴片2的边缘通过所述4个短路探针3分别与所述接地组件1连接。
与图1所示的宽带天线相比，图11中的宽带天线采用U型槽，所述U型槽用于改变圆盘贴片表面电流流向，以达到展宽带宽的目的。
同样地，为了确定图11所示的宽带天线的性能，利用HFSS仿真软件进行仿真，其中，低剖面体的直径DGND为100mm，所述圆盘贴片2的直径Dpatch为20mm，所述U型槽的槽体高度W为9.6mm，槽体长度L为12.4mm，槽壁厚度b为1mm，槽底厚度c为1mm。
根据上述仿真，得到的S11参数曲线图如图13所示，从中可以看出：所述宽带天线的中心频率为2.4GHz，在回波损耗S11<﹣10dB时，所述宽带天线的阻抗频带为从2.08到2.72GHz，相对带宽达到了27％，满足宽带天线的要求。
下面以U型槽为例，介绍开槽能够展宽带宽的原因。
参见图14、图15所示，图14表示普通矩形贴片天线示意图及其等效电路图，图15表示加U型槽的矩形贴片天线示意图及其等效电路图。其中，从图14可以看出，普通矩形贴片天线可以等效为一个简单的LC谐振回路，电流I从馈电点Q流出，沿贴片流向辐射边，而等效LC谐振回路中的电感L和电容C的值取决于沿贴片流向辐射边的电流的路径长度。
在矩形贴片上具有U型槽后，如图15所示，其等效电路会有所改变。在矩形贴片中间流动的电流，其电流方向和路径几乎没有发生变化，此部分等效的LC谐振回路基本保持不变，即在原来的谐振频率处仍然出现一个谐 振点。然而，在偏离矩形贴片中心的地方，由于U型槽的存在，电流会沿着U型槽的边缘流动，使其路径相应增加，反应到等效电路上相当于增加了一部分串联电感ΔLS，即此部分的等效电路为LC谐振回路增加了串联电感。
这样，经过开槽处理的矩形贴片天线，等效电路就由原来的单一谐振回路变为双谐振回路形式，出现两个谐振点。而经过合理的开槽处理，可以将两个谐振点连在一起，形成宽频带。
以上所述仅是本申请的可选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。
工业实用性
本发明实施例提供一种宽带天线，能够调节天线的谐振特性和阻抗匹配，形成双谐振从而展宽带宽，且结构简单易实现。

Claims (7)

  1. 一种宽带天线，用于一移动终端，包括接地组件、圆盘贴片、至少一个短路探针和信号馈入组件；
    其中，所述圆盘贴片上具有开槽，所述圆盘贴片通过所述至少一个短路探针与所述接地组件连接，所述圆盘贴片通过所述信号馈入组件与所述移动终端连接，所述信号馈入组件与所述接地组件连接。
  2. 根据权利要求1所述的宽带天线，其中，所述开槽为圆环槽，所述圆环槽将所述圆盘贴片分割为相互独立的第一圆盘贴片和圆环贴片，所述第一圆盘贴片通过所述信号馈入组件与所述移动终端连接，所述圆环贴片通过所述至少一个短路探针与所述接地组件连接。
  3. 根据权利要求1所述的宽带天线，其中，所述开槽为U型槽。
  4. 根据权利要求1至3任一所述的宽带天线，其中，所述圆盘贴片的中心点通过所述信号馈入组件与所述移动终端连接。
  5. 根据权利要求1所述的宽带天线，其中，所述信号馈入组件是一个同轴线，外层与所述接地组件连接，中间是介质层，内层是馈电铜芯，一端与所述圆盘贴片连接，另一端与所述移动终端连接。
  6. 根据权利要求1所述的宽带天线，其中，所述圆盘贴片的材料采用单面覆铜的印刷电路板。
  7. 根据权利要求2所述的宽带天线，其中，所述圆环槽的缝隙宽度为1毫米mm，所述第一圆盘贴片的直径为8mm，所述圆环贴片的内径为10mm且外径为20mm。
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CN107785659A (zh) * 2017-10-16 2018-03-09 广东曼克维通信科技有限公司 飞行器及其机载超宽带全向天线
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