pifa: planar inverted-f antenna 平面倒f天线 · 2017. 12. 27. · 三角形pifa天线...

PIFA: PIFA: PlanarPlanar InvertedInverted--F AntennaF Antenna平面倒平面倒FF天线天线

平面倒平面倒FF天线的理论与实例天线的理论与实例喻志远喻志远电子科技大学电子科技大学 2006.2.202006.2.20

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小天线的主要类型小天线的主要类型

11。。MicrostripMicrostrip Antenna(MSAAntenna(MSA) ) 微带天线微带天线 22。。PIFAPIFA：平面倒：平面倒FF天线天线 33。。ILIL：：倒倒LL天线天线 44。。Monopole Monopole MicrostripMicrostrip AntennaAntenna单极微单极微带天线带天线

以上天线都具有低剖面(Low-Profile )特点


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主要小天线的带宽主要小天线的带宽


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ChuChu--Limit Limit 一定天线体积与天线一定天线体积与天线相对带宽的关系相对带宽的关系


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现代移动通信对天线的基本要求现代移动通信对天线的基本要求

现代通信面临的挑战# Signal Reliability# Minimize signal loss# Combat multipath fading effects# Power requirements# Miniaturization: Low Profile# Data rates# Frequency utilization


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微带天线微带天线 MSAMSA1。The length of the patch

(L) is typically about a third to a half of a free-

space wavelength (λο), .2。The dielectric thickness is

in the range of 0.003λο to 0.5λο.

3。A commonly used dielectric for such

antennas is polytetrafluoralethylene (PTFE), whichhas a relative dielectric constant of about 2.5.

polytetrafluoral ethylene聚四氟乙烯


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MSAMSA特点特点 1. They are low-profile antennas. 2. They are easily conformable to nonplanar surfaces. Along with their low profile this makes them well suited for use on high-performance airframes. 3. They are easy and inexpensive to manufacture in large quantities using modern printed-circuit techniques. 4. When mounted to a rigid surface they are mechanically robust. 5. They are versatile elements in the sense that they can be designed to produce a while variety of patterns and polarizations, depending on the mode excited and the particular shape of patch used.6. Adaptive elements can be made by simply adding an appropriately placed pin between the patch and the ground plane. Using such

loaded elements, theantenna characteristics can be controlled.


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分析模型分析模型

Transmission Line Model for Microstrip Antennas Cavity Model for Microstrip Antennas


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MSAMSA的的QQ值与基片的相对介电常值与基片的相对介电常数介质的关系数介质的关系


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一些天线的一些天线的QQ值值


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PIFAPIFA天线的背景天线的背景现代移动通信对天线的要求主要为以下几方面：

1。小尺寸。 (Compact in size) 2。轻重量。(Light in Weight) 3。与设备共形。(Conformity with structure) 4。全向辐射。(Omni-Directional) 5。多频带工作。(Multi-Band Operation) 6。低造价。(Low Fabrication Cost)


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PIFAPIFA的特点的特点 Advantages The PIFA has many advantages： easy fabrication, low manufacturing cost, and simple structure. Disadvantages But the major disadvantage keep the basic PIFA from

diverse application is its narrow bandwidth, The major limitation of many low-profile antennas is

narrow bandwidth. Typical conventional PIFA’s have a 5% bandwidth, but advanced designs offer wider bandwidth.


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PIFAPIFA天线带宽天线带宽

where f u and f l are upper and lower frequency of bandwidth, f r is resonant frequency, Q is quality factor,R is loss component of antenna, L is inductive component of antenna, C is capacitive component of antenna,S is volume of antenna.


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PIFAPIFA天线基本结构天线基本结构

*The basic PIFA consists of a ground plane, a top plate element, a feed wire attached the ground plane and the top plate, and a shorting plane that is connected between the ground and top plate.

*In general, the most frequently used method to broaden the bandwidth is to raise the height of shorting plane that is increasing the volume [2].


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PIFAPIFA天线的带宽和主要研究方法天线的带宽和主要研究方法

从本质上说从本质上说PIFAPIFA天线是一种窄带天线，它天线是一种窄带天线，它的相对带宽大概为的相对带宽大概为8%8%，可以满足一般移，可以满足一般移动通信的应用。动通信的应用。

从工作模式而言，从工作模式而言，PIFAPIFA又可以看成是一有又可以看成是一有短路片（点）的微带天线，其谐振模式为短路片（点）的微带天线，其谐振模式为TM100TM100


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天线主要研究方法天线主要研究方法

尽从理论上我们可以把PIFA天线作各种近似，但精确的分析必须应用数值分析的方法：

主要数值方法有：矩量法（MOM），有限元（FEM）法，时域有限差分方法（FDTD）。

矩量法是基于矩量法是基于GreenGreen函数的积分方程的离散的解函数的积分方程的离散的解有限元法是基于变分法的数值解有限元法是基于变分法的数值解

时域有限差分法是基于差分法的离散数值方法。时域有限差分法是基于差分法的离散数值方法。


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有限接地平面对有限接地平面对PIFAPIFA天线的影响天线的影响

有限天线是小天线的重要组成部分，它对天线的有限天线是小天线的重要组成部分，它对天线的电特性有重大影响。电特性有重大影响。

有限接地平面将对天线的谐振频率，带宽，天线有限接地平面将对天线的谐振频率，带宽，天线增益，方向图，产生直接影响增益，方向图，产生直接影响

设计者常需要对设计者常需要对PIFAPIFA天线的尺寸，接地平面的天线的尺寸，接地平面的大小和其电特性之间作出折衷大小和其电特性之间作出折衷..

对无限大的接地平面，人们可以用镜像法来分析对无限大的接地平面，人们可以用镜像法来分析接地平面对天线的影响，但有限大的接地平面，接地平面对天线的影响，但有限大的接地平面，其边缘的电流分布对场的辐射有重要贡献。其边缘的电流分布对场的辐射有重要贡献。


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有限接地板对天线阻抗的影响有限接地板对天线阻抗的影响


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有限接地板对有限接地板对PIFAPIFA天线的影响（工作频率）天线的影响（工作频率）


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有限接地板对有限接地板对PIFAPIFA天线的影响天线的影响22工作频率

方向性相对带宽

当接地板的尺寸为0.8λ时PIFA天线的相对工作带宽为0.8%


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PIFAPIFA天线宽带技术天线宽带技术

除了增加接地板与上部辐射板之间的间隙以外，展宽PIFA天线带宽的技术还有

1。使用附加金属贴片的双谐振电路技术。 2。加载高介电常数介质 3。加入贴片电阻以增加天线负载，降低Q值 4。采用斜边顶板结构，如图示，辐射带宽可达16%

DESIGN OF A COMPACT PIFA FOR MOBILE PHONES *B.C. Kim, J.D. Park , and H.D. Choi Radio & Broadcasting Technology Laboratory, ETRI 161 Gajong-dong, Yuseong-gu, Daejeon 305-350 KOREA E-mail : [email protected]


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多工作频带多工作频带PIFA PIFA 两个或两个以上工作频带便得移动通信更两个或两个以上工作频带便得移动通信更加便利，以下是常见移动通信频段加便利，以下是常见移动通信频段

GSM:Global System for Mobile; DCS:Digital Cellular Sytem;

PCS: Personal Communication System; IMT: International Mobile Telecommunication ISM: Industrial , Scientifical, Medical


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GA Method in the Design of GA Method in the Design of PIFAPIFA

Chromosome 染色体

Mutate 变异

计算结果

2。1GHHz-2.56GHz

电压驻波比小于2的带宽460MHz

19.5%


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Internal PIFA for 2.4=5 GHz WLANapplicationsY.J. Cho, Y.S. Shin and S.O. ParkELECTRONICS LETTERS 5th January 2006 Vol. 42 No. 1

2.4GHz…..110MHz 4.6%

5.GHz ……900MHz 18%


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Optimization of PIFA-IFA Combination in HandsetAntenna DesignsZhan Li and Yahya Rahmat-Samii,IEEE TRANSACTIONS ON AP VOL. 53, NO. 5, MAY 2005p.1770

inverted “F” antenna (IFA)

Multiantennadevelopment inone handset has become more and more common.


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Integrated Planar Multiband Antennas for Personal Communication Handsets

IEEE TRANSACTIONS ON AP, VOL. 54, NO. 2, FEBRUARY 2006 p.384

开缝可以使PIFA天线工作在多个频率下。

Integrated planar multi-band antennas


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Internal Shorted Patch Antenna for a UMTS Folder-TypeMobile PhoneIEEE TRANSACTIONS ON AP, VOL. 53, NO. 10, OCTOBER 2005 p.3391

UniversalMobile Telecommunication System (UMTS)(1920－ 2170 MHz）


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Multiband PIFA for WLAN Mobile TerminalsIEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, VOL. 4, 2005 p.349

开缝双频天线


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A Miniaturized Hilbert PIFA for Dual-Band MobileWireless ApplicationsIEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, VOL. 4, 2005 p. 59

Hilbert geometry 是一种分形几何形状


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Meandered Multiband PIFA WithCoplanar Parasitic PatchesIEEE MICROWAVE AND WIRELESS

COMPONENTS LETTERS, VOL. 15, NO. 10, OCTOBER 2005 P.630


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INVESTIGATIONS INTO PERFORMANCES OF SINGLE LAYER AND STACKED CONFIGURATIONS OF MULTI-BAND PIFA ANTENNA


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DESIGN OF A COMPACT PIFA FOR MOBILE PHONESDESIGN OF A COMPACT PIFA FOR MOBILE PHONES P.809


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Single Feed Compact Quad-Band PIFA Antenna for Wireless Communication ApplicationsIEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 53, NO. 8, AUGUST 2005 2631


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Compact slotted planar inverted-F RFID tagmountable on metallic objectsELECTRONICS LETTERS 24th November 2005 Vol. 41 No.

集总参数元件加载天线In most applications, the chip resistance is found to be in the range of3–150 O, and reactance in the range of 200–50 O (capacitive).


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折线和环形柱PIFA天线

IEEE， APS 2005, P.508


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三角形PIFA天线

Dual-Frequency Triangular Planar Inverted-F AntennaIEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 53, NO. 2, FEBRUARY 2005 P874


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IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, VOL. 16, NO. 3, MARCH 2006 113, Design of a Planar Inverted-F AntennaWith Very Wide Impedance Bandwidth


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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 54, NO. 2, MARCH 2005 477Multiband PIFA Vehicle Telematics Antennas


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pifa: planar inverted-f antenna 平面倒f天线 · 2017. 12. 27. · 三角形pifa天线...

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