Control of ground plane influence on antenna radiation pattern for mobile handheld devices

This paper presents the effects of a choke-slot on solid ground plane of an antenna, fabricated on FR4 substrate to be used in mobile communication system. Techniques have been discussed to control the ground plane current and reduce any degradation. The simulations and measurements show that introducing a slot on a conventional solid ground plane can significantly improve the radiation pattern of an antenna. Good performance at the Personal Communication Service (PCS 1900) band promises the use of this antenna on personal mobility, advance cellular phone services and wireless communication services. Achieving the maximum gain towards the expected direction for mobile phone application with the help of a choke-slot on antenna´s ground plane demonstrates the effectiveness of this technique.