Variable micro strip line - bandpass filter on the basis of coupled λ / 4 - resonators

摘要

Bandpass filter (fi), consisting of at least one tunable, central bandpass filter (kf), which is located on a support board (t) is coupled with one another and which are arranged λ / 4 - line resonators (lr) and, in order to achieve a variably adjustable center frequency – a filter - control unit with a memory and varactor diodes (v1, v2) in reverse-connected series circuit, characterized in that at least two λ / 4 - line resonators (lr1, lr2) via a common mass (via) are joined to each other, whereby in the case of resonance frequency of which high currents through the centrally arranged mass (via) and form a strong inductive coupling of the two λ / 4 - line resonators (lr1, lr2) is created, which is clearly greater than the purely by way of the field electric coupling.