tailieunhanh - Ultra Wideband Part 15

Tham khảo tài liệu 'ultra wideband part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 414 Ultra Wideband and goes on with B then continue with C. For example the prototype 4 A first fixing the taper s height LR2 to then B optimizing the taper width Wt and then C adjust the WC for the radiation-characteristics. The optimized results showed an SWB impedance bandwidth of at least over 150GHz. In fact the result of prototype 4 with parameters listed in column 4 of shown the downtrend of reflection coefficient for increasing frequency Fig. 2 we expect that prototype 4 will well-behave beyond 150GHz as well. Fig. 5. Impedance bandwidth of the developed prototypes. Ordinate magnitude of the reflection coefficient dB Abscissa frequency GHz . Parameter mm Prototype 1 Prototype 2 Prototype 3 Prototype 4 Description Lf Length of the feed section Rf Blending radius in the feed section WGND Width of the ground Ws 2 2 2 2 Width of the signal line Wg Width of the CPW s gap Lt Tapering length in the transition region Wt A B Upper tapering in the transition region Lri Resonator length in the radiating region Lr2 B A Resonator length in the matched radiating region Wr Resonator width in the radiating region Wc 7 7 7 C Circle s separation width r Radius of the top circle area Bandwidth 4-14GHz 5-25GHz 5-150GHz Bandwidth enhancement Table 1. Parameters of the prototypes all dimensions are in mm the alphabetical order A B C indicates the priority-order of parameters in the SVO process. On the Design of a Super Wide Band Antenna 415 5. Design and Fabrication Design All prototypes depicted in Fig. 4 with their design dimensions listed in have been fabricated on Duroid RT 5880 high frequency laminate with substrate height h copper cladding thickness t 17pm relative dielectric constant r electric and magnetic loss tangents are .