Efficient, Compact 868MHz Antenna for Retrofit of Electronic Appliance

This paper describes a wire loop antenna with a parasitic element, designed for use in smart smoke detector, acting as a wireless gateway. The antenna has been designed, prototyped and tuned to 868MHz band, then it was characterised and tested in real environment. The antenna can easily be tuned to the 2.45GHz ISM band, and then used by Bluetooth and WiFi devices.