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There are lot of research into enabling multiple services within a single communication terminal unit (e.g. PDA). The PIFA which can be implemented in a small space, is an attractive design approach for mobile units. The ability to incorporate dual band or multi-band performance further enhances the merit of these antennas for future application.

For further reading:

1. "Multiband Planar inverted F antenna", National URSI conference, York, March 1999
2. "Triple band planar inverted F antenna", IEEE AP-S International Symposium, 908-911, Orlando 1999.
3. "Multi-band planar inverted F antenna ", Electronics Letter Vol 36, No.3, pp1 , 2000

 

Dual feed tri-band PIFA

 

 

 

L-shape spur line loaded PIFA designed for mobile computing terminal (eg. Nokia 9110). The antenna is capable of dual polarisation to cater for GSM/DCS(Vertical) and WLAN(Horizontal) operation. The design is also able to general vertical polarisation in all three bands.

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Single feed tri-band PIFA

 

 

 

Triple band operation generated from two L-shape spur line with a single feed probe. Matching is achieved by external extention of metal plate.

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Triple band PIFA

 

 

 

A triple band antenna design for GSM, DECT and WLAN operation. Antenna uses 3 feed probes and is suitable for indoor picocell or handheld PDA applications.

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U and V Slot antenna

 

 

U-slot and V-slot antennas have excellent dual band and gain performance. When using degenerated modes, typical bandwidth is greater than 30%. A dual mode U-Slot antenna is also design where DCS and DECT bands are vertical pol. while WLAN is horizonal pol.

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Solution to undesirable radiation to human head

Perhaps the way to solve the problem of mobile phone radiation is to remove the human head

- conclusion in a presentation at AP2000

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