By R. Hincapie, et. al.,
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Extra resources for Advanced Transmission Techniques in WiMAX
The distance between the antenna and the flat section is hc. For the last reflector, we modified the conductor reflector shape. Instead of the -shaped reflector, we took the conductor reflector to have the form of an inverted shaped reflector. The geometry of the inverted -shaped reflector with the horizontal plate is shown in Fig. 27(d). The inverted -shaped reflector, having a horizontal flat section dimension of Wd1×Wd3, is bent with a bent angle of . The width of the bent section of the inverted -shaped reflector is Wd2.
The obtained bandwidth covers the required bandwidth of the WiFi and WiMAX systems (2300-2500 MHz). Some errors in the resonant frequency occurred due to tolerance in FR4 substrate and poor manufacturing in the laboratory. Corresponding radiation patterns and realized gains of the proposed antenna were measured in the anechoic antenna chamber located at the Rajamangala University of Technology Thanyaburi (RMUTT), Thailand. The measured radiation patterns at 2400, 2450 and 2500 MHz with both co- and cross-polarization in E- and H- planes are given in Fig.
2007) Fig. 29. Measured return losses of three different reflectors :72° (72DegAnt), 90° (90DegAnt), and 120° (120DegAnt) 43 CPW-Fed Antennas for WiFi and WiMAX (a) (b) (c) Fig. 30. , 2011) (a) (b) (c) Fig. 31. , 2011) Fig. 32. 2 Unidirectional CPW-fed slot antenna using metasurface Fig. 33 shows the configurations of the proposed antenna. It consists of a CPW-fed slot antenna beneath a metasurface with the air-gap separation ha. The radiator is center-fed inductively coupled slot, where the slot has a length (L-Wf ) and width W.