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Mobile Antennas

Mobile phone antennas come in two types - external and internal. External antennas include retractable monopole antennas and helical antennas. Internal antennas include microstrip antennas (MSA) and planar inverted-F antennas (PIFA). Parameters like radiation pattern, VSWR, antenna gain, and efficiency are important considerations. Single band PIFA antennas and wideband PIFA antennas are commonly used inside mobile phones. Specific absorption rate (SAR) is also measured to ensure safe levels of electromagnetic power absorption in the brain.

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70 views11 pages

Mobile Antennas

Mobile phone antennas come in two types - external and internal. External antennas include retractable monopole antennas and helical antennas. Internal antennas include microstrip antennas (MSA) and planar inverted-F antennas (PIFA). Parameters like radiation pattern, VSWR, antenna gain, and efficiency are important considerations. Single band PIFA antennas and wideband PIFA antennas are commonly used inside mobile phones. Specific absorption rate (SAR) is also measured to ensure safe levels of electromagnetic power absorption in the brain.

Uploaded by

Music Lover
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Mobile Antennas

Introduction
• An antenna (or aerial) is an electrical device which converts electric
currents into radio waves, and vice versa.
• An antenna consists of two parts, Transmitter and Receiver.
• The antenna at the time of transmitting electromagnetic waves is called
transmitting antenna.
• The same antenna in the time of receiving electromagnetic waves is called
receiving antenna.
Parameters
• Radiation pattern
• VSWR =(1+|ᴦ|)/(1-| ᴦ | )
• Antenna gain 𝑮 = 𝜺 𝑹 𝑫
• Antenna efficiency 𝜺 𝑹 = 𝑷 𝒓 𝑷 𝒊𝒏
• Bandwidth 𝑩𝑾% = 𝒇 𝒎𝒂𝒙−𝒇 𝒎𝒊𝒏 𝒇 𝑪𝒆𝒏𝒕𝒆𝒓 × 𝟏𝟎𝟎
Types of Antennas used in Mobile Phones :
• External Antennas
1. Retractable Monopole (whips) antennas.
2. Helical Antennas.
• Internal Antennas
1. Microstrip antennas (MSA)
2. Planar inverted-F antennas (PIFA)
Mobile Phone antenna design
• Single band PIFA antenna
• Wideband PIFA antenna
Single band PIFA antenna
Wideband Antenna
Antenna used in mobile phones
Outer antenna-Helical antenna
Inner antenna-Microstrip patch antenna
SAR Measurement 
• SAR: Specific Absorption Rate.
•  Our brain can absorb Electromagnetic (EM) power. The SAR measures
how much power our head absorbs.
References
• T. Taga and K. Tsunekawa, “Performance analysis of a built-in planar inverted F antenna for 800 MHz band portable radio
units,” IEEE J.Select. Areas Commun, vol. SAC-5, pp. 921–929, June 1987.
• K. Sato, K. Matsumoto, K. Fujimoto, and K. Hirasawa, “Characteristics of a planar inverted-F antenna on a rectangular
conducting body,” Electron. Commun. Japan, pt. 1, vol. 72, pp. 43–51, 1989.
• T. Taga, “Analysis of planar inverted-F antennas and antenna design for portable radio equipment,” in Analysis, Design,
and Measurement of Small and Low-Profile Antennas, K. Hirasawa and M. Haneishi,Eds. Norwood, MA: Artech House,
1992, pp. 161–180.
• P. Vainikainen, J. Ollikainen, O. Kivekäs, and I. Kelander, “Resonator- based analysis of the combination of mobile
handset antenna and chassis,” IEEE Trans. Antennas Propagat., vol. 50, pp. 1433–1444, Oct. 2002.
• http://scholar.lib.vt.edu/theses/available/etd-7697-21043/unrestricted/CH1_2.PDF
• Chuang, H. R. “Human Operator Coupling Effects on Radiation Characteristics of a Portable Communication Dipole
Antenna”., IEEE Transactions on Antennas and Propagation, v. 42, n. 4, April 1994, pp. 556-560.
Thank You

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