WO2016101136A1 - Antenne de terminal téléphonique mobile multibande à résonance diélectrique - Google Patents

Antenne de terminal téléphonique mobile multibande à résonance diélectrique Download PDF

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Publication number
WO2016101136A1
WO2016101136A1 PCT/CN2014/094634 CN2014094634W WO2016101136A1 WO 2016101136 A1 WO2016101136 A1 WO 2016101136A1 CN 2014094634 W CN2014094634 W CN 2014094634W WO 2016101136 A1 WO2016101136 A1 WO 2016101136A1
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WO
WIPO (PCT)
Prior art keywords
dielectric
mobile phone
phone terminal
antenna
rectangular
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Application number
PCT/CN2014/094634
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English (en)
Chinese (zh)
Inventor
刘元安
苏明
刁一恒
黎淑兰
于翠屏
吴永乐
王卫民
Original Assignee
北京邮电大学
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Application filed by 北京邮电大学 filed Critical 北京邮电大学
Priority to PCT/CN2014/094634 priority Critical patent/WO2016101136A1/fr
Publication of WO2016101136A1 publication Critical patent/WO2016101136A1/fr

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    • 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

Definitions

  • the invention relates to the technical field of communication antennas, in particular to a multi-band medium resonance mobile phone terminal antenna.
  • the main technologies of the traditional terminal antenna include: 1) Inverted F antenna: The structure is simple, and the bandwidth is narrow, which cannot meet the requirements of the current communication broadband multi-band. 2) Planar inverted F antenna (PIFA): It can increase the bandwidth of the antenna, but it can not meet the requirements of multiple communication bands at the same time. The profile is large and the bandwidth is greatly affected by the size of the ground.
  • PIFA Planar inverted F antenna
  • the existing antennas are mainly classified into two types of three-dimensional antennas and two-dimensional planar printed antennas, but the three-dimensional antennas have the defects of large size and narrow bandwidth, and it is also difficult to satisfy the antenna shape design, which is flexible and diversified, and is light in size and thin. Requirements.
  • the two-dimensional planar printed antenna realizes the thinning and thinning of the volume, there are defects such as complicated structure, insufficient adjustment, and high cost. Therefore, the design is small in size, simple in structure, and low in cost, and can satisfy multi-mode and multi-mode.
  • the mobile phone antenna required for the frequency band is the research direction of the future terminal antenna.
  • the object of the present invention is to provide a multi-band dielectric resonant handset antenna that meets the requirements for multi-mode multi-band mobile phone antennas in the future.
  • the present invention provides a multi-band dielectric resonant mobile phone terminal antenna, which is provided with a high dielectric constant ceramic medium with a groove, a multi-branch monopole excited by a ceramic medium, and a 50-ohm feed. Microstrip lines, dielectric plates, vias connecting monopoles and microstrip lines, and printed ground.
  • the antenna has the characteristics of small size, light weight, simple structure, frequency bandwidth and easy processing and integration. Therefore, the invention has low manufacturing cost, simple structure and wide frequency band of operation, and has good application prospects.
  • the medium of the antenna has a groove, and the slot has little effect on the performance of the antenna, and can still meet the design requirements.
  • the purpose of the slot is to effectively reduce the weight of the antenna. At the same time, it is also possible to increase the radiation area of the medium and improve the radiation efficiency of the antenna.
  • the dielectric of the antenna requires a high dielectric constant (greater than 10). Since the selection of the dielectric constant of the dielectric affects the size of the antenna, the dielectric constant of 38 is selected in the embodiment of the present invention to better reduce the antenna. size of.
  • the reference ground of the antenna is printed on the front side of the dielectric board, and the feed microstrip line is printed on the reverse side of the dielectric board.
  • the rectangular dielectric having a dielectric constant of 38 is located on the front side of the dielectric plate, placed at a corner of the dielectric plate outside the reference ground, and the multi-branched monopole is printed on the bottom surface of the ceramic medium.
  • the multi-branch monopole of the antenna acts as an excitation unit to radiate energy through the medium, and is equivalent to changing the boundary condition of the medium and the distribution characteristics of the electric field and the magnetic field in the medium, and the required size can be obtained by adjusting the size of the monopole.
  • the frequency band excites the ceramic medium to produce multiple modes, resulting in multiple bands.
  • the microstrip line is a conversion unit of the antenna printed on the reverse side of the dielectric board, the beginning of the feeding microstrip line is connected to the radio antenna interface reverse level male head (SMA), and the tail end is connected to the multi-branch monopole through the via hole. child.
  • SMA radio antenna interface reverse level male head
  • the via hole is a connection unit of the antenna, and connects the microstrip line at the bottom end of the dielectric board and the multi-branched monopole at the bottom end of the medium.
  • the dielectric plate is made of an insulating material suitable for the radio frequency microwave band and having a corresponding dielectric constant.
  • the multi-band medium resonance mobile phone terminal antenna provided by the present invention. Its The acquisition of multiple frequency bands mainly relies on multi-branch monopole feeding under the medium, and the rectangular dielectric with high dielectric constant is excited to generate high-order modes. At the same time, a groove is added to the rectangular dielectric to effectively reduce the size and weight of the antenna.
  • the antenna can cover Global System for Mobile Communications (GSM)/Decentralized Control System (DCS)/Personal Communication Service (PCS)/Universal Mobile Telecommunications System (UMTS)/Long Term Evolution Project 2300 (LTE2300)/Long Term Evolution Project 2500 (LTE2500), etc.
  • GSM Global System for Mobile Communications
  • DCS Decentralized Control System
  • PCS Personal Communication Service
  • UMTS Universal Mobile Telecommunications System
  • LTE2300 Long Term Evolution Project 2300
  • LTE2500 Long Term Evolution Project 2500
  • the frequency band can meet the requirements of various frequency bands of mobile phone terminals today, and has high radiation efficiency and stable gain, and has a larger bandwidth than a terminal antenna that resonates with other media. Its main structure is characterized by small size, light weight, flexible design, simple feeding system and frequency bandwidth. Therefore, compared with other dipole antennas, the invention has low manufacturing cost, simple feeding, and wide frequency band of operation, and has good application prospects.
  • FIG. 1 is a schematic diagram of a three-dimensional structure of a multi-band dielectric resonant mobile phone terminal antenna according to an embodiment of the present invention
  • FIG. 2 is a front elevational view of a multi-band dielectric resonant mobile phone terminal antenna according to an embodiment of the present invention
  • FIG. 3 is a schematic rear view of a multi-band dielectric resonant mobile phone terminal antenna according to an embodiment of the present invention
  • FIG. 4 is a measured view of frequency characteristics of a multi-band dielectric resonant mobile phone terminal antenna according to an embodiment of the present invention.
  • the antenna includes: as shown in FIG. 1 , the antenna includes: a dielectric plate 1 , a feeding microstrip line 2 on the reverse side of the dielectric plate 1 , and a high dielectric located at a corner of the front surface of the dielectric plate a constant rectangular dielectric 3, a multi-branched monopole 4 on the bottom surface of the rectangular ceramic dielectric, a printed reference ground 5 under the rectangular ceramic dielectric, and a via 6 connecting the monopole and the feeding microstrip line; Wherein, the multi-branch monopole and the feeding microstrip line are connected through a via; the starting end of the feeding microstrip line 2 is soldered with a reverse-level male head (SMA), and then the external signal source is connected, and the tail end passes through the via hole. 6 Connect the multi-branch monopole 4.
  • SMA reverse-level male head
  • the dielectric plate 1 is made of an insulating material suitable for the radio frequency microwave band and having a corresponding dielectric constant.
  • a medium having a flame resistant material grade of FR4 is selected, and the dielectric constant is 4.4.
  • the dielectric plate 1 has a rectangular shape with a length of 100 mm, a width of 60 mm, and a thickness of 1mm.
  • the reference ground 5 of the antenna is printed on the front side of the dielectric plate 1, which is 70 mm*60 mm in this embodiment; the feed microstrip line 2 is printed on the reverse side of the dielectric plate 1, and the impedance value is 50 in this embodiment. ohm.
  • a rectangular dielectric 3 having a high dielectric constant is located on the front side of the dielectric plate 1. It can be placed at a corner of the dielectric plate 1 outside the reference ground 5.
  • ceramic is selected as the material of the rectangular dielectric 3, and the dielectric constant is not less than 10, and may be 38 as a preferred embodiment. It is verified by simulation that in order to ensure that the antenna covers the 1.7G-2.7G frequency range at high frequencies, when the thickness of the dielectric is reduced to 3mm, the frequency increases due to the decrease of the dielectric size, and the frequency rises to 1.74G. Therefore, in order to ensure effective frequency coverage, the rectangular dielectric 3 in the present embodiment has a thickness of not less than 3 mm, and preferably has a length of 25 mm, a width of 15 mm, and a thickness of 4 mm.
  • At least one groove is formed on the front surface of the rectangular dielectric.
  • three horizontally parallel grooves are added to the rectangular dielectric 3.
  • the rectangular groove has a depth of 1 mm and a width of 2 mm, and the spacing between the grooves is 8 mm.
  • only a groove having a width of 6 mm can be added to the rectangular dielectric 3, and the same technical effect can be achieved, that is, the antenna can cover 1.7G-2.7G at a high frequency.
  • the width of the groove should be no more than 12 mm.
  • the multi-branch monopole 4 of the antenna acts as an excitation unit for exciting the rectangular dielectric 3 to generate multiple modes, thereby generating multiple frequency bands.
  • the multi-branched monopole 4 can be printed on the bottom surface of the rectangular dielectric 3 in contact with the dielectric plate 1, and is an anti-S-shaped metal copper foil in the embodiment.
  • the bottom horizontal branch (the section connected to the via) has a great influence on the performance of the antenna.
  • the lengths of the branches of the multi-branch monopole 4 from top to bottom are: 8.5 mm, 13 mm. , 12mm, 11mm, 10mm, thickness is about 1mm.
  • the feed microstrip line 2 is an antenna conversion unit that transmits energy input from the SMA port to the antenna. It is printed on the reverse side of the dielectric board 1, the beginning is connected to the radio antenna interface SMA, and the tail end is connected to the multi-branch monopole 4 through the via 6. Because the impedance of the feed microstrip line needs to match the characteristic impedance of the SMA, and the industry standard value of the latter is 50 ohms, therefore, the feed The impedance of the microstrip line is also set to 50 ohms. Its width is 1.9mm.
  • the via 6 is a connection unit of the antenna, and is connected to the feeding microstrip line 2 at the bottom end of the dielectric board 1 and the multi-branched monopole 4 at the bottom end of the rectangular ceramic dielectric 3.
  • a rectangular ceramic dielectric 3 having a high dielectric constant with a groove is selected as the main radiating element of the antenna.
  • the dielectric resonant antenna has low frequency loss and high efficiency.
  • the rectangular medium has greater design flexibility, and can reduce the size of the antenna and reduce the antenna by notching the surface of the medium without affecting the radiation performance of the antenna. the weight of.
  • the field distribution of the rectangular dielectric resonator involved can be analyzed by an ideal rectangular dielectric waveguide model, as shown in FIG.
  • the resonant frequency of a rectangular dielectric resonator can be obtained by solving a rectangular waveguide model:
  • k 0 is the propagation constant of free space
  • k x , k y , and k z are propagation constants in the x, y, and z directions, respectively.
  • the size of the high dielectric constant rectangular ceramic dielectric with a groove in this embodiment is 25 ⁇ 15 ⁇ 4 mm 3
  • the resonant frequency formula of the dielectric resonant antenna can be obtained by the formula (1)(2)(3)(4):
  • the basic mode of the medium with a size of 25 ⁇ 15 ⁇ 4 mm 3 can be obtained as 6.17 GHz, which cannot meet the frequency band required by the mobile phone antenna. Since the metal on the surface of the medium can change the distribution of the electric field in the medium, the radiation characteristics of the medium can be changed by changing the feeding method.
  • the excitation method used in the embodiment of the present invention is a multi-branch monopole 4 printed on the bottom surface of the medium, because the electric field and magnetic field distribution of the rectangular dielectric resonator are determined by the boundary conditions thereof, so that the loading is performed at the bottom end of the medium.
  • Branching monopole 4 is equivalent to the introduction of an ideal electrical conductor. Change the distribution characteristics of the electromagnetic field in the medium.
  • the resonant frequency of the dielectric resonant antenna can be varied by adjusting the length of the multi-branch monopole to obtain the desired bandwidth.
  • the rectangular dielectric selected for the examples of the present invention is a dielectric having a high dielectric constant, generally requiring a dielectric constant greater than 10, and more preferably, the dielectric used in the examples of the present invention is a ceramic dielectric having a dielectric constant of 38.
  • the quality factor Q of the medium is in accordance with the dielectric constant of the medium as follows:
  • the feeding mode of the dielectric resonator has a great influence on its resonant frequency and quality factor.
  • Common feeding methods include coupled feed, coaxial feed and microstrip feed.
  • the main branch of the multi-branch monopole can be regarded as a monopole with a wavelength of ⁇ /4, which can meet the requirements of the low-band GSM900 of the mobile terminal antenna; on the other hand, the short-branch can be combined to change the quality of the dielectric resonator.
  • the factor and the electric field and magnetic field distribution of the dielectric resonator can produce multi-frequency resonance, which mainly satisfies the dielectric resonant antenna in the high frequency band and obtains a wider bandwidth.
  • the reference ground (6) is selected to be coplanar with the multi-branch monopole (4), and the size of the reference ground has a great influence on the low frequency of the antenna, and the size of the reference ground is 70 ⁇ 60 mm. 2 , located below the dielectric resonator, can improve the bandwidth requirements of low frequency resonance.
  • the SMA connector is used for welding, and then the external signal source is applied.
  • the additional excitation signal is transmitted through the 50 ohm feeder microstrip line (1) and the via (6).
  • Branch monopole (4) The ceramic medium (3) having a high dielectric constant is excited by the multi-branched monopole (4), and the energy of the electromagnetic wave is radiated by the ceramic medium to complete the function of wireless communication.
  • the frequency characteristics of the embodiment of the present invention that is, the experimental results of the return loss parameter are introduced.
  • the abscissa in the figure is the frequency component in GHz; the ordinate is the amplitude component in dB.
  • a multi-frequency dielectric resonant terminal antenna according to an embodiment of the present invention can cover a frequency band of 880 MHz-960 MHz and 1.70 G-2.70 G, and the return loss parameter is less than -6 dB in the operating frequency band. Therefore, the test of this embodiment was successful and achieved the object of the invention.

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Abstract

L'invention concerne une antenne de terminal téléphonique mobile multibande à résonance diélectrique. L'antenne de terminal téléphonique mobile multibande à résonance diélectrique est pourvue d'un diélectrique en céramique (3) rectangulaire à constante diélectrique élevée comprenant une rainure, un monopôle multi-branche (4), une plaque diélectrique (1), une ligne microruban d'alimentation (2) une masse imprimée (5) et un trou d'interconnexion (6). La structure d'antenne présente les innovations suivantes : le diélectrique rectangulaire à constante diélectrique élevée est excité en utilisant un monopôle multi-branche, la distribution du champ électrique dans le diélectrique est modifié pour amener le diélectrique à générer une résonance à mode multiple, ce qui permet à l'antenne du terminal de satisfaire à des exigences multibande multimode ; de plus, la rainure est ajoutée au diélectrique de la présente invention, la surface de rayonnement du diélectrique peut être accrue tout en réduisant efficacement le poids de l'antenne et le rendement de rayonnement de l'antenne est amélioré. L'antenne de terminal téléphonique mobile multibande à résonance diélectrique présente pour caractéristiques une petite taille, un poids léger, un structure simple, une large bande de fréquences de fonctionnement et un rendement de rayonnement élevé. La présente invention a un faible coût de fabrication, une structure simple et elle est facile à traiter et à intégrer, elle peut satisfaire simultanément aux normes de communication 2G, 3G et 4G, offre de bonnes perspectives d'application et de promotion.
PCT/CN2014/094634 2014-12-23 2014-12-23 Antenne de terminal téléphonique mobile multibande à résonance diélectrique WO2016101136A1 (fr)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107039746A (zh) * 2017-04-10 2017-08-11 杨明 一种小型化十一频段手机天线
CN108565545A (zh) * 2018-06-25 2018-09-21 河南师范大学 一种紧耦合强谐振小天线
WO2020134477A1 (fr) * 2018-12-29 2020-07-02 瑞声声学科技(深圳)有限公司 Système d'antenne d'encapsulation de résonateur diélectrique et terminal mobile
CN113708058A (zh) * 2021-07-15 2021-11-26 深圳市信维通信股份有限公司 基于陶瓷壳体的5g毫米波天线结构及电子设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004017461A1 (fr) * 2002-08-14 2004-02-26 Antenova Limited Petite antenne dielectrique electrique a bande large
CN102544735A (zh) * 2012-02-03 2012-07-04 中国矿业大学(北京) 超宽带h型交叉式介质谐振器天线
CN102738576A (zh) * 2012-07-01 2012-10-17 桂林电子科技大学 一种宽频平面印刷天线
CN104617395A (zh) * 2014-12-23 2015-05-13 北京邮电大学 一种多频段介质谐振手机终端天线

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004017461A1 (fr) * 2002-08-14 2004-02-26 Antenova Limited Petite antenne dielectrique electrique a bande large
CN102544735A (zh) * 2012-02-03 2012-07-04 中国矿业大学(北京) 超宽带h型交叉式介质谐振器天线
CN102738576A (zh) * 2012-07-01 2012-10-17 桂林电子科技大学 一种宽频平面印刷天线
CN104617395A (zh) * 2014-12-23 2015-05-13 北京邮电大学 一种多频段介质谐振手机终端天线

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107039746A (zh) * 2017-04-10 2017-08-11 杨明 一种小型化十一频段手机天线
CN108565545A (zh) * 2018-06-25 2018-09-21 河南师范大学 一种紧耦合强谐振小天线
CN108565545B (zh) * 2018-06-25 2023-06-23 河南师范大学 一种紧耦合强谐振小天线
WO2020134477A1 (fr) * 2018-12-29 2020-07-02 瑞声声学科技(深圳)有限公司 Système d'antenne d'encapsulation de résonateur diélectrique et terminal mobile
CN113708058A (zh) * 2021-07-15 2021-11-26 深圳市信维通信股份有限公司 基于陶瓷壳体的5g毫米波天线结构及电子设备
CN113708058B (zh) * 2021-07-15 2023-10-17 深圳市信维通信股份有限公司 基于陶瓷壳体的5g毫米波天线结构及电子设备

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