Advanced Transmission Techniques in WiMAX by R. Hincapie, et. al.,

By R. Hincapie, et. al.,

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5 mm and 15 mm respectively. The gaps between the slots are mostly 8 mm. The diameter of the circular radiating surface is 150 mm. Generally, by turning the EBRS ON and the sixth and seventh of the BRS OFF, it will result in a beam shape radiation pattern. The pattern will becomes narrower with an increasing number of EBRS switches turned ON. While by turning ON the BRS and the second up to fourth of EBRS turned OFF, a broadside radiation pattern will be obtained. A Reconfigurable Radial Line Slot Array Antenna for WiMAX Application (a) (b) (c) (d) 51 Fig.

0 dBi over the entire viable frequency band. Fig. 27. CPW-FSLW (a) radiating element above, (b) flat reflector, (c)  -shaped reflector with a horizontal plate, and (d) inverted -shaped reflector with a horizontal plate 42 Advanced Transmission Techniques in WiMAX As shown, the gain variations are smooth. The average gains of the 90DegAnt and 120DegAnt over this bandwidth are 6 dBi and 5 dBi, respectively. This is due to impedance mismatch and pattern degradation, as the back radiation level increases rapidly at these frequencies.

019. 20 mm. The 50- SMA connector is used to feed the antenna at the CPW line. 05 GHz, compose of Su, S, and SL. 55 mm. 38 Advanced Transmission Techniques in WiMAX (a) (b) Fig. 23. (a) Configurations of the proposed fractal slot antenna and (b) photograph of the prototype CPW-Fed Antennas for WiFi and WiMAX 39 Fig. 24. 050 mm, are chosen to implement the prototype antenna by etching into chemicals. The prototype of the proposed antenna is shown in Fig. 23(b). The simulated and measured return losses of the antenna are illustrated in Fig.

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