Multi-Band WLAN Antennas based on the Principle of Duality

In this paper we apply the principle of duality to printed-bent-strip multi-band antennas. As the electromagnetic dual of a conducting strip is a slot in a conducting sheet, we explore the possibility of achieving multi-band operation with multiple coupled bent slots in a ground plane. A combination of a multi-band printed strip antenna and a multi-band printed slot antenna would exhibit polarization orthogonality. Such a pair can efficiently provide both space diversity and polarization diversity to combat multi-path fading effects in WLAN systems