4.1 UWB band-pass filter with sharp tuned notched band rejection based on CRLH transmission-line unit cell

A compact UWB BPF with reconfigurable notch bands based on CRLH transmission line unit cell has been designed, simulated, and fabricated [48]. Two packages of software are used, namely, CST MWS and 3D EM commercial software HFSS version 13.0. The simulated and measured results are comparable. This filter has the advantage of very small size, and it also has four notched frequencies in its passband. The notched bands suppress the narrow-band services such as WLAN and WiMAX. One can control the center frequency of the notched band by varying the length L6 of the stub. The total area of the filter is 16.4 5 mm<sup>2</sup> . This small area makes it suitable for modern applications which need miniaturization.
