Tunable filter for filtering radio frequencies and microwaves in e.g. TV, has filtrate network incorporating syntony elements, and additional network electronically reducing intermodulation introduced by syntony elements

摘要

The filter has a filtrate network for filtering radio frequency frequencies and microwaves. The filtrate network consists of printed line segments provided with multiple connections. Frequency of signals is determined by frequency of resonance of lines. The filtrate network incorporates syntony elements. An additional network electronically reduces intermodulation introduced by the syntony elements.