Design of Antennas for Handheld DVB-H ... - Lunds tekniska högskola

The size of the antenna is another very important characteristic that has been on
consideration during the design. The maximum size of the ground plane that has
been used is 110*60 mm. This size has been chosen to be about the same size as
today’s mobile terminals with a screen large enough to watch TV. The height
above the ground plane is flexible, but the total volume of the antenna is always
kept as small as possible.
To avoid making gain measurements the whole time during the design of different
antennas a 6 dB return loss criterion was used, this is often used when designing
antennas for mobile terminals. To verify the antenna performance, gain
measurement was made in the end of the antenna design.
For covering the whole DVB-H band with a normal size terminal, the total
efficiency must be deteriorated. In a transmitting antenna, the resistive and
matching losses must be minimized because of the valuable battery power and
excessive heat producing. But in a receiver antenna, lower efficiency, can be
accepted if the signal level is high enough compared to the noise level.
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