Compact Liquid Crystal Based Tunable Band-Stop Filter with an Ultra-Wide Stopband by Using Wave Interference Technique

Figure 4

(a) Double-stub structure and (b) its transmission () for at the centre frequency with respect to offset length , and the electric field distribution when the offset lengths are (c) , (d) , and (e) .

(a)

(b)

(c)

(d)

(e)