Guideline on the Use of Built-in Antenna

Pay attention to the following to use the pattern antenna configured on the substrate. Although the wireless performance of the antenna is degraded if placed in a case, this degradation could be reduced by reference to this guideline. Also, we offer the antennae suitable for being placed in the enclosure.

Make sure to conduct the wireless test using a simulated enclosure prior to development.

• Place an antenna around which there is no metal object. In particular, there must not be any metal plate or grounding pattern around the antenna as these objects give a significant impact on it (for instance, "exposure of the direction of the radio emission direction with a case made of metal plates at the back side" represents the arrangement that is likely to totally impair the performance.
• Keep the whole circumference of the pattern antenna (see (3) below) 10cm or more away from any metal object.
• A non-metallic case is recommended.
  A case of mesh metal could deteriorate performance.
  A case with a single side made of metal could also deteriorate performance.
• The use of an external antenna is recommended if you use a metal case.
• Use resin bolts and nuts for the mounting holes close to the antenna.
• Place the antenna vertically so the maximized performance is expected.
• Keep the antenna away from other wireless antennae (e.g. wireless LAN).