Jesper Thaysen, Nokia Denmark; Kaj B. Jakobsen, Technical University of Denmark

Articles by Jesper Thaysen, Nokia Denmark; Kaj B. Jakobsen, Technical University of Denmark

Estimation of the Optimal Location of Metallic Objects Inside a Mobile Phone

lanar near-field measurements of the electric field components are used to determine where to place external components, such as a loudspeaker or camera, without significantly affecting the radiated field. The location of the peak value of the electric...

September 1, 2005

Jesper Thaysen, Nokia Denmark; Kaj B. Jakobsen, Technical University of Denmark

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The planar inverted-F antenna (PIFA) is widely used in cellular phones, primarily due to its compactness and size. 1 The demand for communication devices for personal communication systems has led to a constant search for ways to reduce the cellular phone dimensions. Applications, such as loudspeakers, cameras, etc., are...

A Size Reduction Technique for Mobile Phone PIFA Antennas Using Lumped Inductors

A size reduction technique for the planar inverted-F antenna (PIFA) is presented. An 18 nH lumped inductor is used in addition to a small 0.3 cm3 PIFA. The PIFA is located on dielectric foam, 5 mm above a 40 mm × 100 mm ground plane. It is possible to ...

July 6, 2005

Jesper Thaysen, Nokia Denmark; Kaj B. Jakobsen, Technical University of Denmark

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The demand for smaller communication devices for personal communication systems has led to a constant search for methods to reduce the cellular phone dimensions. However, the wavelength does not decrease with the same speed as the size of the mobile phones due to the higher frequency bands used. Even...