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Bluetooth antenna design

Posted: 10 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Bluetooth antenna? ceramic antenna? antenna design?

This application note is intended for designers using the LMX5251 or LMX5252 Bluetooth radio chips or LMX9820A or LMX9830 Bluetooth modules. Antenna design for various applications is described along with theory, matching circuit description, suppliers and examples.

Any structure that is resonant at 2.45GHz with bandwidth more than 100MHz and efficiency >50 percent can be considered a Bluetooth antenna. Therefore, a countless variety of antennas can be used, and they are application-specific. Some common types are:

  • Wire MonopoleThis consists of a simple wire soldered at one end from which it is fed against a ground plane. It is trimmed to be resonant at 2.45GHz and provides good performance and high efficiency. The disadvantage of this antenna is that it is not low profile because it projects above the PCB.

  • PIFAThe Printed inverted F antenna (PIFA) is like a monopole printed on a PCB, but it has a ground point and feed point along the main resonant structure.

  • HelixSimilar to the wire monopole, except that it is coiled around a central core (usually air) making the physical dimensions smaller. It provides excellent performance, but projects above the PCB.

  • CeramicSurface mount dielectric antennas are the smallest types of antennas available, because they are printed on a high-dk ceramic slab, which makes the electric field concentrated allowing the antenna to be made small while keeping a high resonant frequency.

    This application note only describes PIFA and ceramic antennas because they are the most common, low-profile, smallest, and inexpensive types available.

    View the PDF document for more information.

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