Advances in Antenna Technology for Wireless Handheld Devices
Figure 29
Simulated current distribution at 1.82 GHz without and with a shortening mechanism consisting of a short circuit plate of at 1.82 GHz. The continuous line is a qualitative approach of the currents on the ground plane. For (a), a current mode having two sinusoids is supported causing a multi-lobe pattern. For (b), the current in the upper PCB board has been mitigated due to the trap.
