WO2013159274A1 - 一种双频天线 - Google Patents

一种双频天线 Download PDF

Info

Publication number
WO2013159274A1
WO2013159274A1 PCT/CN2012/074526 CN2012074526W WO2013159274A1 WO 2013159274 A1 WO2013159274 A1 WO 2013159274A1 CN 2012074526 W CN2012074526 W CN 2012074526W WO 2013159274 A1 WO2013159274 A1 WO 2013159274A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiator
antenna
frequency
dual
resonance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/074526
Other languages
English (en)
French (fr)
Inventor
王璐
郭義祥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hytera Communications Corp Ltd
Original Assignee
Hytera Communications Corp Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hytera Communications Corp Ltd filed Critical Hytera Communications Corp Ltd
Priority to PCT/CN2012/074526 priority Critical patent/WO2013159274A1/zh
Publication of WO2013159274A1 publication Critical patent/WO2013159274A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/32—Vertical arrangement of element
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/32—Vertical arrangement of element
    • H01Q9/36—Vertical arrangement of element with top loading

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a dual-band antenna.
  • wireless communication technologies have been continuously developed, and the development of various wireless communication devices is changing with each passing day.
  • an antenna for transmitting or receiving radio waves is one of the important components.
  • the continuous development of wireless communication devices requires that antennas become shorter and shorter, and the frequency bands that can be operated are wider and wider.
  • Current handheld devices typically have multiple operating bands, such as the Global System of Mobile Communication (GSM) for mobile phones and the frequency band (GSM+DCS) required for the Digital Cellular Telecommunications System (DCS).
  • GSM Global System of Mobile Communication
  • GSM+DCS frequency band
  • DCS Digital Cellular Telecommunications System
  • the Ultra High Frequency (UHF) and the Global Positioning System (GPS) of the walkie-talkie can realize multiple functions or auxiliary functions, and the antenna should also be dual-frequency or multi-frequency.
  • the external dual-frequency antenna is generally realized by a double-helical structure, that is, the high-frequency resonant line ⁇ portion is placed outside the low-frequency line , and FIG. 1 shows a specific structure of the external dual-frequency antenna.
  • This type of antenna has good impedance matching at high and low frequencies, and at the same time produces omnidirectional radiation at low frequencies.
  • the external dual-frequency antenna of this structure usually sets the GPS cable to the bottom of the whole antenna, and can be used more for the external antenna of the mobile phone or the walkie-talkie.
  • the radiation direction of the antenna of this structure is directed more toward the lower hemisphere, and the GPS reception mainly requires the radiation in the direction of the upper hemisphere (the portion pointing to the sky), and thus the receiving performance of the GPS band of the antenna of this structure is relatively poor.
  • an external line for tuning the GPS band is reversed at the top of the whip antenna, so that the radiation direction of the GPS band is more directed to the upper hemisphere, thereby improving GPS reception.
  • Performance is a specific structure of this type of dual-band antenna.
  • the overall length of the antenna of this structure is long, which is inconvenient in practical use, and at the same time cannot meet the requirements of shorter and smaller antennas in wireless communication devices.
  • the object of the present invention is to provide a dual-frequency antenna which has a short overall length and can meet the requirements of shorter and smaller antennas in a wireless communication device, so as to overcome the overall length of the dual-frequency antenna in the prior art. Long defects.
  • an embodiment of the present invention provides a dual-band antenna including a radiator connected to a host through a feeding point of a host, wherein the radiator includes a linear shape for generating a first resonance. a first segment of the radiator and a helical second segment of the radiator connected to the first segment of the radiator, wherein the second segment of the radiator is for generating a second resonance, and the frequency of the second resonance is higher than The frequency of the first resonance.
  • the second length of radiator is located at one end of the radiator away from a feed point of the host.
  • the second segment of the radiator is located at an intermediate portion of the radiator.
  • the second length of radiator is located at one end of the radiator adjacent to a feed point of the host.
  • the radiator is a whip antenna.
  • the second segment of the radiator is a GPS resonant line.
  • the first length of the radiator has a length of 70 mm, and the height of the GPS resonance line is 18.2 mm, the wire diameter is 0.6 mm, the diameter is 6 mm, the number of turns is 7, and the pitch is 2.6 mm.
  • a first-stage radiator for generating a low-frequency resonance is disposed in a straight line, and a second-stage radiator connected to the first-stage radiator for generating a high-frequency resonance is set in a spiral shape.
  • the overall length of the radiator is shortened, making the dual-frequency antenna having such a structure short and convenient.
  • FIG. 1 is a schematic structural view of a dual-frequency antenna of a double-helical structure in the prior art
  • FIG. 2 is a schematic structural view of a whip antenna in the prior art
  • FIG. 3 is a schematic structural view of a dual-frequency antenna according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic structural view of a dual-frequency antenna according to Embodiment 2 of the present invention.
  • FIG. 5 is a schematic structural diagram of a dual-frequency antenna according to Embodiment 3 of the present invention.
  • FIG. 6 is a schematic structural view of a dual-frequency antenna that satisfies specific parameters in the third embodiment of the present invention
  • FIG. 7 is a schematic diagram of echo loss of a simulation result of a whip antenna that satisfies specific parameters in the third embodiment of the present invention
  • FIG. 8 is a schematic diagram of actual measured return loss of a whip antenna that satisfies specific parameters in the third embodiment of the present invention.
  • Fig. 9 is a 0° and 90 of the UHF band of the whip antenna satisfying the specific parameters in the third embodiment of the present invention on the E plane. Radiation pattern of the simulation results;
  • Fig. 10 is a diagram showing the GPS frequency band of the whip antenna satisfying the specific parameters in the third embodiment of the present invention at 0° and 90 on the E plane. Radiation pattern of the simulation results;
  • FIG. 11 is a gain diagram of a UHF band of a whip antenna that satisfies specific parameters in the third embodiment of the present invention.
  • Fig. 12 is a gain pattern of the GPS band of the whip antenna which satisfies the specific parameters in the third embodiment of the present invention.
  • the embodiment of the present invention provides a dual-frequency antenna, the dual-frequency antenna includes: a radiator connected to the host through a feeding point of the host, wherein the radiator includes a linear first-stage radiation for generating a first resonance And a helical second-stage radiator connected to the first-stage radiator, wherein the second-stage radiator is used to generate a second resonance, and the frequency of the second resonance is higher than the frequency of the first resonance.
  • the first segment of the radiator for generating the low frequency resonance is arranged in a straight line
  • the second segment of the radiator for generating the high frequency resonance connected to the first segment of the radiator is arranged in a spiral shape, which is shortened.
  • the overall length of the radiator makes the dual-frequency antenna having the structure short and convenient, and can meet the requirements of short and convenient antennas in the wireless communication device.
  • the radiator may be a whip antenna, wherein the second segment of the radiator may be a GPS resonant line, and the UHF+GPS band operating mode may be implemented.
  • the whip antenna is divided into two parts, one part is a linear first-stage radiator, and the other part is a spiral second-stage radiator connected to the first-stage radiator. , causing the current of the spiral second-stage radiator to flow to the same direction as the current of the radiator; and the double-frequency antenna formed by a spiral ⁇ with the top of the figure shown in FIG. 2 (the current of the spiral turns and the whip antenna) Compared to the current flow, the radiation performance of the antenna is greatly improved.
  • the radiator in the embodiment of the present invention includes a linear first-stage radiator for generating a first resonance and a spiral second-stage radiator connected to the first-stage radiator, the first-stage radiator and the second
  • the segment radiator may be disposed at any position of the radiator, and the positions of the first segment radiator and the second segment radiator will be described in detail below by way of specific embodiments.
  • the embodiments given below are merely exemplary, and the positional relationship between the first-stage radiator and the second-stage radiator is not limited to the following manners, and all of the first-stage radiators and the first embodiment capable of achieving the object of the present invention
  • the positional setting of the two-stage radiator is within the protection scope of the present invention.
  • the embodiment of the present invention provides a dual-frequency antenna, and its structure is shown in FIG. 3.
  • the dual-frequency antenna 11 includes a linear first-stage radiator 12 for generating a first resonance and a first-stage radiator. 12 connected spiral-shaped second-stage radiators 13, and second-stage radiators 13 for generating a second resonance,
  • the second radiating body 13 is located at an end of the antenna 11 away from the feeding point of the main unit, that is, the second radiating body 13 is located at an upper portion of the first radiating body 12.
  • the spiral second-stage radiator connected to the first-stage radiator for generating the second resonance is disposed at one end of the antenna away from the host feeding point, that is, disposed in the first-stage radiator.
  • the overall length of the antenna is shortened, and the antenna is made short and convenient.
  • the current flow of the second radiator in the dual-frequency antenna is the same as that of the dual-frequency antenna, and the radiation performance of the antenna is improved.
  • the embodiment of the present invention provides a dual-frequency antenna, and its structure is shown in FIG. 4.
  • the dual-frequency antenna 21 includes a linear first-stage radiator 22 for generating a first resonance and a first-stage radiator. 22 connected spiral-shaped second-stage radiator 23, second-stage radiator 23 for generating a second resonance, wherein the second-stage radiator 23 is located at an intermediate portion of the antenna 21, that is, the second-stage radiator 23 is located at the The middle portion of a section of radiator 22.
  • the second-stage radiator in which the dual-frequency is used to generate the second resonance is disposed in the middle of the dual-frequency antenna, thereby shortening the overall length of the antenna and making the antenna short and convenient;
  • the current of the second segment of the dual-frequency antenna flows in the same direction as the current of the dual-frequency antenna, which improves the radiation performance of the antenna.
  • the embodiment of the present invention provides a dual-frequency antenna, and its structure is shown in FIG. 5.
  • the dual-frequency antenna 31 includes a linear first-stage radiator 32 for generating a first resonance and a first-stage radiator. 33 connected spiral-shaped second-stage radiator 33, second-stage radiator 33 for generating a second resonance, wherein the second-stage radiator 33 is located at one end of the antenna 21 near the feeding point of the host, that is, the second The segment radiator 33 is located at a lower portion of the first segment radiator 32.
  • a spiral second-stage radiator connected to the first-stage radiator for generating the second resonance is disposed at one end of the dual-frequency antenna near the feeding point of the host, that is, in the first segment.
  • the lower part of the radiator shortens the overall length of the antenna, making the antenna short and convenient; in addition, the dual frequency
  • the current flow of the second radiator in the antenna is the same as the current flow of the antenna, which improves the radiation performance of the antenna; further, the dual-frequency antenna structure of the structure is more stable than the structures of Embodiment 1 and Embodiment 2, It is easier to implement in production and suitable for a wide range of applications.
  • the performance of the dual-band antenna is described in detail below by taking the structure shown in FIG. 6 as an example, wherein the radiator is a whip antenna, and the second radiator is a GPS resonant line; and, specifically, to achieve work in UHF (400- Take the 470MHz) band and the whip antenna of the GPS (1575MHz) band as an example.
  • UHF 400- Take the 470MHz
  • the whip antenna of the GPS (1575MHz) band as an example.
  • the resonance of the UHF band and the GPS band needs to satisfy an odd multiple of the resonance relationship; however, the GPS band is not an odd multiple of the UHF band, and the ratio of the resonance points of the two working bands is 3.62.
  • the odd multiple frequency resonance relationship of the antenna is not satisfied. It is necessary to change the multiplier relationship between the UHF band and the GPS band by adjusting the height of the bottom GPS line, the pitch, and the length of the whip antenna at the top, so that both the UHF band and the GPS band have good resonance.
  • the inventors found through experiments that when the length L of the first segment of the radiator is 70 mm, the height H of the GPS resonance line is 18.2 mm, the wire diameter is 0.6 mm, the diameter is 6 mm, the number of turns is 7, and the pitch is 2.6 mm ( The schematic diagram of the structure is shown in Fig. 6. When the UHF band and the GPS band satisfy the odd multiple frequency relationship, the whip antenna has better radiation performance. The radiation performance of the whip antenna designed with the above parameters is specifically described below through several performance parameters.
  • HFSS11.0 The radiation performance of the whip antenna was simulated by HFSS11.0.
  • the test results are as follows. For the sake of clarity, HFSS11.0 only sets the display whip antenna structure, and sets the host part to be hidden.
  • FIG. 7 it is a schematic diagram of the return loss of the simulation result of the whip antenna that satisfies the specific parameters in the third embodiment of the present invention.
  • the abscissa is the frequency, and the ordinate is the return loss, where ml is the GPS frequency back.
  • the wave loss value, m2, m3 is the return loss value of the UHF band start frequency point and the return loss value of the end point frequency point.
  • FIG. 8 it is a schematic diagram of the actual measured return loss of the whip antenna that satisfies the specific parameters in the third embodiment of the present invention.
  • the abscissa is the frequency, and the ordinate is the return loss, where nl is the GPS frequency.
  • the return loss value, n2, n3 is the return loss value of the UHF band start frequency point and the return loss value of the end point frequency point.
  • the return loss of the whip antenna satisfying the specific parameters of the third embodiment of the present invention is known.
  • the actual value is not much different from the simulated value.
  • FIG. 9 is a radiation pattern of simulation results of 0° and 90° of the UHF frequency band of the whip antenna satisfying the specific parameters in the third embodiment of the present invention; as shown in FIG. 10, it is satisfied that the present invention is implemented.
  • the GPS frequency band of the whip antenna with specific parameters is 0 on the E side.
  • the simulated gain data in Figures 9 and 10 is the ideal value for the PCB loss without the antenna jacket and mainframe housing. It can be seen from the figure that after adding the turns at the bottom of the whip antenna, the UHF band and gain do not change, and the antenna gain is about 2.5dBi.
  • the gain pattern of the UHF band of the whip antenna that satisfies the specific parameters in the third embodiment of the present invention is the GPS of the whip antenna that satisfies the specific parameters in the third embodiment of the present invention.
  • the gain pattern of the frequency band, the simulated gain data is the ideal value of the PCB loss without the antenna jacket and the host casing; according to the gain pattern of the GPS band, most of the GPS frequency bands are concentrated in the upper hemisphere, and The antenna gain of the GPS band is also higher than that of the top-loaded whip antenna, and the antenna gain is about 4dBi.
  • Table 1 and Table 2 respectively show the gain and efficiency of the UHF band and the GPS band of the whip antenna of one embodiment of the present invention. It can be seen that the gain of the GPS band is about 4 dB.
  • the whip antenna adopting the structure shown in FIG. 6 of the third embodiment of the present invention and satisfying the above parameters realizes the relationship between the odd frequency multiplication of the UHF frequency band and the GPS frequency band, and achieves a good resonance relationship, and the gain of the GPS frequency band is obvious. Increased, achieved better radiation performance; and, at this time, the length of the whip antenna is only about 10cm.
  • the overall length of the antenna is greatly shortened compared to a dual-frequency antenna composed of a spiral ⁇ at the top of FIG. 2 having an overall length of about 17 cm.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)

Description

一种双频天线
技术领域 本实用新型涉及无线通信技术领域， 具体涉及一种双频天线。 背景技术 近年来， 无线通信技术不断发展， 各种无线通信设备的发展日新月异。 在 无线通信设备中， 用来发射或接收无线电波的天线是重要的元件之一， 无线通 信设备的不断发展要求天线越来越短小便捷， 同时能够操作的频带也越来越 宽。 目前的手持终端设备通常有多个工作频段，例如手机的全球移动通讯系统 ( Global System of Mobile Communication , GSM )及数字蜂窝通信系统 (Digital Cellular Telecommunications System, DCS)所需的频段（GSM+DCS ), 对讲机 的超高频 （Ultra High Frequency, UHF)及全球定位系统（Global Positioning System, GPS )等， 从而实现多个功能或辅助功能， 对应其天线也应是双频或 者多频的。 目前， 外置双频天线一般采用双螺旋结构来实现， 即将高频谐振线圏部分 放在低频线圏的外部， 图 1示出了外置双频天线的一种具体结构。这种天线在 高低频上都有良好的阻抗匹配， 同时能在低频上产生全向的辐射。 为实现 UHF+GPS频段的工作模式，这种结构的外置双频天线通常将 GPS线圏设置在 整个天线的底部， 可以较多的用于手机或者对讲机的外置天线中。 但是， 这种 结构的天线的辐射方向更多的指向下半球面， 而 GPS接收主要需要上半球面 方向 (指向天空的部分)的辐射，因而这种结构的天线的 GPS频段的接收性能比 较差。 针对上述这种状况， 在鞭天线的顶部反串一个用于调谐 GPS频段的外部 线圏， 使 GPS频段的辐射方向更多的指向上半球面， 从而提高了 GPS的接收 性能， 如图 2所示为该类双频天线的一种具体结构。 但是， 这种结构的天线整 体长度较长，在实际使用中很不方便， 同时也无法满足无线通信设备中天线越 来越短小便捷的要求。
发明内容
有鉴于此， 本实用新型的目的在于提供一种整体长度较短， 能够满足无线 通信设备中天线越来越短小便捷的要求的双频天线，以克服现有技术中双频天 线整体长度较长的缺陷。
为实现上述目的， 本实用新型的一个实施例提供一种双频天线， 包括通过 主机的馈电点与主机相连的辐射体， 其中， 所述辐射体包括用于产生第一谐振 的直线状的第一段辐射体和与所述第一段辐射体相连的螺旋状的第二段辐射 体， 其中所述第二段辐射体用于产生第二谐振， 且所述第二谐振的频率高于所 述第一谐振的频率。
优选地，所述第二段辐射体位于所述辐射体的远离所述主机的馈电点的一 端。
优选地， 所述第二段辐射体位于所述辐射体的中间部位。
优选地，所述第二段辐射体位于所述辐射体的靠近所述主机的馈电点的一 端。
优选地， 所述辐射体为鞭天线。
优选地， 所述第二段辐射体为 GPS谐振线圏。
优选地， 所述第一段辐射体的长度为 70mm, 所述 GPS谐振线圏的高度 为 18.2mm、 线径为 0.6mm、 直径为 6mm、 圏数为 7、 节距为 2.6mm。
根据本实用新型实施例，将用于产生低频谐振的第一段辐射体设置成直线 状， 将与第一段辐射体相连的用于产生高频谐振的第二段辐射体设置为螺旋 状， 缩短了辐射体的整体长度， 使具有这种结构的双频天线变得短小便捷。
附图说明 为了更清楚地说明本实用新型实施例或现有技术中的技术方案，下面将对 实施例或现有技术描述中所需要使用的附图作筒单地介绍，显而易见地， 下面 描述中的附图是本实用新型的一些实施例，对于本领域普通技术人员来讲， 在 不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1是现有技术中双螺旋结构的双频天线的结构示意图；
图 2是现有技术中鞭天线的结构示意图；
图 3是本实用新型实施例一的双频天线的结构示意图；
图 4是本实用新型实施例二的双频天线的结构示意图；
图 5是本实用新型实施例三的双频天线的结构示意图；
图 6是满足本实用新型实施例三中具体参数的双频天线的结构示意图； 图 7 是满足本实用新型实施例三中具体参数的鞭天线的仿真结果的回波 损耗示意图；
图 8 是满足本实用新型实施例三中具体参数的鞭天线的实际测得的回波 损耗示意图；
图 9是满足本实用新型实施例三中具体参数的鞭天线的 UHF频段在 E面 的 0° 和 90。 的仿真结果的辐射方向图；
图 10是满足本实用新型实施例三中具体参数的鞭天线的 GPS频段在 E面 的 0° 和 90。 的仿真结果的辐射方向图；
图 11是满足本实用新型实施例三中具体参数的鞭天线的 UHF频段的增益 方向图；
图 12是满足本实用新型实施例三中具体参数的鞭天线的 GPS频段的增益 方向图。
具体实施方式 为使本实用新型实施例的目的、技术方案和优点更加清楚， 下面将结合本 实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、 完整 地描述， 显然， 所描述的实施例是本实用新型一部分实施例， 而不是全部的实 施例。基于本实用新型中的实施例， 本领域普通技术人员在没有做出创造性劳 动前提下所获得的所有其他实施例， 都属于本实用新型保护的范围。 本实用新型实施例提供一种双频天线， 该双频天线包括： 通过主机的馈电 点与主机相连的辐射体， 其中， 辐射体包括用于产生第一谐振的直线状的第一 段辐射体和与第一段辐射体相连的螺旋状的第二段辐射体， 其中， 第二段辐射 体用于产生第二谐振， 且第二谐振的频率高于第一谐振的频率。
本实用新型实施例将用于产生低频谐振的第一段辐射体设置成直线状，将 与第一段辐射体相连的用于产生高频谐振的第二段辐射体设置为螺旋状，缩短 了辐射体的整体长度，使具有该结构的双频天线变得短小便捷， 能够满足无线 通信设备中天线短小便捷的要求。
在本实用新型的一个实施例中， 辐射体可以为鞭天线， 其中， 第二段辐射 体可以为 GPS谐振线圏， 可以实现 UHF+GPS频段的工作模式。
在本实用新型实施例的双频天线中，将鞭天线分为两部分， 一部分是直线 状的第一段辐射体， 另一部分是与第一段辐射体相连的螺旋状的第二段辐射 体， 使得螺旋状的第二段辐射体的电流流向与辐射体的电流流向相同； 与图 2 示出的顶部反串一个螺旋线圏构成的双频天线（其螺旋线圏的电流流向与鞭天 线的电流流向相反）相比， 极大地提高了天线的辐射性能。
本发明实施例中的辐射体包括用于产生第一谐振的直线状的第一段辐射 体和与第一段辐射体相连的螺旋状的第二段辐射体，第一段辐射体和第二段辐 射体可以设置在辐射体的任何位置，下面通过具体实施例对第一段辐射体和第 二段辐射体的位置做详细说明。 但是， 下面给出的实施例只是示例性的， 第一 段辐射体和第二段辐射体的位置关系并不局限于下列这些方式，所有能够实现 本实用新型目的的第一段辐射体和第二段辐射体的位置设置都在本实用新型 的保护范围内。
实施例一
本实用新型实施例提供一种双频天线， 其结构示意图如图 3所示， 该双频 天线 11包括用于产生第一谐振的直线状的第一段辐射体 12以及与第一段辐射 体 12相连的螺旋状的第二段辐射体 13, 第二段辐射体 13用于产生第二谐振， 其中， 第二段辐射体 13位于天线 11的远离主机馈电点的一端， 即第二段辐射 体 13位于第一段辐射体 12的上部。
本实用新型实施例将与第一段辐射体相连的用于产生第二谐振的螺旋状 的第二段辐射体设置在天线的远离主机馈电点的一端，即设置在第一段辐射体 的顶部， 缩短了天线的整体长度， 使天线变得短小便捷； 另外， 该双频天线中 第二段辐射体的电流流向与双频天线的电流流向相同， 提高了天线的辐射性 能。
实施例二
本实用新型实施例提供一种双频天线， 其结构示意图如图 4所示， 该双频 天线 21包括用于产生第一谐振的直线状的第一段辐射体 22以及与第一段辐射 体 22相连的螺旋状的第二段辐射体 23 , 第二段辐射体 23用于产生第二谐振， 其中， 第二段辐射体 23位于天线 21的中间部位， 即第二段辐射体 23位于第 一段辐射体 22的中间部位。
本实用新型实施例将双频用于产生第二谐振的螺旋状的第二段辐射体设 置在双频天线的中间部位， 缩短了天线的整体长度， 使天线变得短小便捷； 另 夕卜， 该双频天线中第二段辐射体的电流流向与双频天线的电流流向相同，提高 了天线的辐射性能。
实施例三
本实用新型实施例提供一种双频天线， 其结构示意图如图 5所示， 该双频 天线 31包括用于产生第一谐振的直线状的第一段辐射体 32以及与第一段辐射 体 33相连的螺旋状的第二段辐射体 33 , 第二段辐射体 33用于产生第二谐振， 其中， 第二段辐射体 33位于天线 21的靠近主机的馈电点的一端， 即第二段辐 射体 33位于第一段辐射体 32的下部。
本实用新型实施例将与第一段辐射体相连的用于产生第二谐振的螺旋状 的第二段辐射体设置在双频天线的靠近主机的馈电点的一端，即设置在第一段 辐射体的下部， 缩短了天线的整体长度， 使天线变得短小便捷； 另外， 该双频 天线中第二段辐射体的电流流向与天线的电流流向相同，提高了天线的辐射性 能； 此外， 与实施例一和实施例二的结构相比， 这种结构的双频天线结构更加 稳固， 生产上更容易实现， 适合大范围应用。
以下以图 6所示的结构为例对双频天线的性能做详细说明， 其中， 辐射体 为鞭天线， 第二段辐射体为 GPS 谐振线圏； 并且， 具体以实现工作在 UHF ( 400-470MHz )频段以及 GPS ( 1575MHz )频段的鞭天线为例。
要使 UHF频段和 GPS频段都有良好的谐振， UHF频段和 GPS频段的谐 振需要满足奇数倍的谐振关系； 但 GPS频段并非 UHF频段的奇数倍， 两个工 作频段的谐振点之比为 3.62, 不满足天线的奇数倍频谐振关系。 需要通过调整 底部 GPS 线圏的高度、 节距以及顶部的鞭天线的长度等来改变 UHF频段和 GPS频段谐振的倍数关系， 从而使 UHF频段和 GPS频段都有良好的谐振。
发明人经过实验发现， 当第一段辐射体的长度 L为 70mm, GPS谐振线圏 的高度 H为 18.2mm、 线径为 0.6mm、 直径为 6mm、 圏数为 7、 节距为 2.6mm (其结构示意图如图 6所示） 时， UHF频段和 GPS频段满足奇数倍频关系， 并且鞭天线具有较好的辐射性能。以下通过几个性能参数对采用上述参数设计 的鞭天线的辐射性能做具体介绍。
采用 HFSS11.0对该鞭天线的辐射性能进行了仿真测试， 测试结果如下， 为清晰起见， HFSS11.0只设置了显示鞭天线结构， 而将主机部分设置为隐藏。
如图 7所示，是满足本实用新型实施例三中具体参数的鞭天线的仿真结果 的回波损耗示意图， 横坐标为频率， 纵坐标为回波损耗， 其中， ml为 GPS频 点的回波损耗值， m2、 m3为 UHF频段起始频点的回波损耗值和终点频点的 回波损耗值。
如图 8所示，是满足本实用新型实施例三中具体参数的鞭天线的实际测得 的回波损耗示意图， 横坐标为频率， 纵坐标为回波损耗， 其中， nl为 GPS频 点的回波损耗值， n2、 n3为 UHF频段起始频点的回波损耗值和终点频点的回 波损耗值。
由图 7与图 8可知，满足本实用新型三中具体参数的鞭天线的回波损耗的 实际值与仿真值差别不大。
图 9所示是满足本实用新型实施例三中具体参数的鞭天线的 UHF频段在 E面的 0° 和 90° 的仿真结果的辐射方向图； 如图 10所示， 是满足本实用新 型实施例三中具体参数的鞭天线的 GPS频段在 E面的 0。 和 90。 的仿真结果 的辐射方向图。 图 9和图 10中的仿真增益数据为不加天线外套和主机外壳， 不计 PCB损耗的理想值。 从图中可以看出， 在鞭天线底部加入线圏后， UHF 的频段和增益均没有发生变化， 天线增益约 2.5dBi左右。
如图 11所示，是满足本实用新型实施例三中具体参数的鞭天线的 UHF频 段的增益方向图； 如图 12所示， 是满足本实用新型实施例三中具体参数的鞭 天线的 GPS频段的增益方向图，仿真的增益数据为不加天线外套和主机外壳， 不计 PCB损耗的理想值；根据 GPS频段的增益方向图， 大部分的 GPS频段的 辐射方向都集中在上半球面， 而且 GPS频段的天线增益也较顶部加载的鞭天 线高， 天线增益约为 4dBi左右。
表一和表二分别为本实用新型一个实施例的鞭天线的 UHF频段和 GPS频 段的增益及效率实测结果， 可见 GPS频段的增益在 4dB左右。
表一 频率 （MHz) 效率 （％) 效率 （dB) 增益 （dB )
400 38% -4.2 -2.2
410 48% -3.2 -1.0
420 52% -2.9 -0.6
430 55% -2.6 -0.4
440 48% -3.2 -1.1
450 43% -3.7 -1.5
460 37% -4.3 -2.1
470 34% -4.7 -2.4
频率 （MHz) 效率 （％) 效率 （dB) 增益 （dB )
1570 66% -1.8 3.9
1575 66% -1.8 4.0
1580 68% -1.7 3.8 采用本实用新型实施例三图 6中所示的结构、并且满足上述参数的鞭天线 实现了 UHF频段和 GPS频段的奇数倍频的关系，达到了较好的谐振关系， GPS 频段的增益有明显增高， 实现了较好的辐射性能； 并且， 此时鞭天线的长度只 有 10cm左右。 与整体长度大约在 17cm的图 2示出的顶部反串一个螺旋线圏 构成的双频天线相比， 天线的整体长度大大缩短。
以上所述仅是本实用新型的优选实施方式，应当指出，对于本技术领域的 普通技术人员来说，在不脱离本实用新型原理的前提下，还可以做出若干改进 和润饰， 这些改进和润饰也应视为本实用新型的保护范围。

Claims

权 利 要 求
1、 一种双频天线， 包括通过主机的馈电点与主机相连的辐射体， 其特征 在于，所述辐射体包括用于产生第一谐振的直线状的第一段辐射体和与所述第 一段辐射体相连的螺旋状的第二段辐射体，其中所述第二段辐射体用于产生第 二谐振， 且所述第二谐振的频率高于所述第一谐振的频率。
2、 根据权利要求 1所述的双频天线， 其特征在于， 所述第二段辐射体位 于所述辐射体的远离所述主机的馈电点的一端。
3、 根据权利要求 1所述的双频天线， 其特征在于， 所述第二段辐射体位 于所述辐射体的中间部位。
4、 根据权利要求 1所述的双频天线， 其特征在于， 所述第二段辐射体位 于所述辐射体的靠近所述主机的馈电点的一端。
5、 根据权利要求 1-4任一项所述的双频天线， 其特征在于， 所述辐射体 为鞭天线。
6、 根据权利要求 5所述的双频天线， 其特征在于， 所述第二段辐射体为 GPS谐振线圏。
7、 根据权利要求 6所述的双频天线， 其特征在于， 所述第一段辐射体的 长度为 70mm, 所述 GPS谐振线圏的高度为 18.2mm、 线径为 0.6mm、 直径为 6mm、 圏数为 7、 节距为 2.6mm。
PCT/CN2012/074526 2012-04-23 2012-04-23 一种双频天线 Ceased WO2013159274A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2012/074526 WO2013159274A1 (zh) 2012-04-23 2012-04-23 一种双频天线

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2012/074526 WO2013159274A1 (zh) 2012-04-23 2012-04-23 一种双频天线

Publications (1)

Publication Number Publication Date
WO2013159274A1 true WO2013159274A1 (zh) 2013-10-31

Family

ID=49482105

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/074526 Ceased WO2013159274A1 (zh) 2012-04-23 2012-04-23 一种双频天线

Country Status (1)

Country Link
WO (1) WO2013159274A1 (zh)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2689485Y (zh) * 2004-02-27 2005-03-30 翟禹 小型高效双频天线
CN101431178A (zh) * 2007-11-08 2009-05-13 神基科技股份有限公司 具有宽频的双频螺旋天线
JP2009182797A (ja) * 2008-01-31 2009-08-13 Nippon Antenna Co Ltd ヘリカルホイップアンテナ
CN201829614U (zh) * 2010-03-24 2011-05-11 海能达通信股份有限公司 鞭状双频天线

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2689485Y (zh) * 2004-02-27 2005-03-30 翟禹 小型高效双频天线
CN101431178A (zh) * 2007-11-08 2009-05-13 神基科技股份有限公司 具有宽频的双频螺旋天线
JP2009182797A (ja) * 2008-01-31 2009-08-13 Nippon Antenna Co Ltd ヘリカルホイップアンテナ
CN201829614U (zh) * 2010-03-24 2011-05-11 海能达通信股份有限公司 鞭状双频天线

Similar Documents

Publication Publication Date Title
US8259014B2 (en) Multi-loop antenna structure and hand-held electronic device using the same
CN103403962B (zh) 多模宽带天线模块及无线终端
CN1320292A (zh) 一种无线电通信设备和天线系统
KR20140111739A (ko) 휴대 단말기용 내장 안테나
Puri et al. A review of antennas for wireless communication devices
CN102916255A (zh) 多频倒f型天线
CN101740859B (zh) 多频带天线
CN204375933U (zh) 宽频天线
CN101364671A (zh) 多频带天线装置
US8816935B2 (en) Dual frequency antenna with wide frequency
CN108155460B (zh) 一种双频全向耦合支节加载的螺旋天线及其制作方法
CN101273490A (zh) 多波段天线
CN101958457B (zh) 宽频的双频天线
WO2012006781A1 (zh) 一种双频天线
TW201212385A (en) Tuneable frequency band antenna
CN113540763B (zh) 一种天线及设备
CN101242034B (zh) 小型化的多频天线
CN106033834A (zh) 天线结构
WO2013159274A1 (zh) 一种双频天线
CN102683822B (zh) 天线及终端
KR101148366B1 (ko) 이동통신단말기용 안테나
JP5005110B2 (ja) 誘電体及び磁性体の格子状周期構造を有する複合構造体を用いたアンテナ
CN114243298A (zh) 天线及电子设备
JP2011515983A (ja) 誘電体及び磁性体の垂直周期構造を有する複合構造体を用いたアンテナ
EP2461421B1 (en) Dual frequency antenna

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12875105

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12875105

Country of ref document: EP

Kind code of ref document: A1