Antennas for Cell-Phones

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An antenna is the most important device in a cell-phone in terms of wireless communication. If the antenna doesn't work very well, the signal strength drops drastically. For the design of cell-phone antennas, we can adopt a dipole, helical, PIFA (Planar Inverted F Antenna), or intennas.

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Antennas for Cell-Phones

  1. 1. Mokwon University Yong Heui CHO(조용희) yhcho@mu.ac.krAntennas forCell-Phones
  2. 2. First Cell-Phone Dr. Martin Cooper in Motorola Motorola RAZR Thin phone: 7.1 [mm] 2
  3. 3. Trend in Cell-Phone Development Volume and weight Weight [g] Volume [cc] 3
  4. 4. Retractable Antenna An antenna that you can retract Basically a dipole antenna with top loading (looks like a hat) $2 when you try to buy $0.1 when you are a company ←amazon.com 4
  5. 5. Stubby Antenna When you open a cap, you can see a helical antenna. (looks like a spring) You don’t have to retract. → It is convenient for users. What is stubby anyway? ←shutterstock.com 5
  6. 6. Ceramic Helical Antenna High permittivity → Small antenna size 6
  7. 7. Intenna Internal antenna: The antenna is in a phone. You can’t see it. A phone case is strongly related to an intenna. 7
  8. 8. Intenna for 3G Phone A metal pattern is served as an antenna. 8
  9. 9. Triple-Band Antenna Intenna: internal antenna Resonance: 900, 1600, 1900 [MHz] ←empire.de 9
  10. 10. PIFA  Planar Inverted F Antenna Signal Input Radiator Original FromCoaxialCable PIFA 10 Integrated PIFA
  11. 11. PIFA for Notebook 11
  12. 12. PIFA for Cell-Phone←antenova.com 12
  13. 13. Current Distributions ←empire.de 13
  14. 14. Antenna for Galaxy Nexus Can you point where the intenna is now? 14
  15. 15. Impedance Matching for Phone  Chip capacitors and inductors are used to matching the antenna and circuit. 15 ←ham-radio.com
  16. 16. Apple’s Antennagate Death grip: when you touch a certain part of an iPhone 4, your call may be dropped. Stainless steel frame as multi-band antennas 16
  17. 17. Effect of Our Body to Phone Our body is a ground plane for a phone. That means our body affects the phone seriously. 17
  18. 18. SAR Measurement SAR: Specific Absorption Rate Your brain can absorb EM power. The SAR measures how much power your head does. 18 ←nearfield.org

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