Abstract: A lightning proof device for filter has a lightning proof device provided between a signal source input end and a filtering system of the filter. The lightning proof device has a first and a second metal inducing sheets opposite to each other, a filtering capacitor being provided corresponding to the first metal inducing sheet. The first metal inducing sheet is connected with the signal source input end of the filter and a first electrode end of the filtering capacitor, and a second electrode end of the filtering capacitor with the filtering system of the filter. The second metal inducing sheet is connected to the ground end. A gap is formed between the first and the second metal inducing sheets. In this manner, surge signal is absorbed and released by the gap in preliminary stage and the residual surge energy is filtered and de-energized by the filtering capacitor in final stage.

Abstract: A lightning proof device for filter has a lightning proof device provided between a signal source input end and a filtering system of the filter. The lightning proof device has a first and a second metal inducing sheets opposite to each other, a filtering capacitor being provided corresponding to the first metal inducing sheet. The first metal inducing sheet is connected with the signal source input end of the filter and a first electrode end of the filtering capacitor, and a second electrode end of the filtering capacitor with the filtering system of the filter. The second metal inducing sheet is connected to the ground end. A gap is formed between the first and the second metal inducing sheets. In this manner, surge signal is absorbed and released by the gap in preliminary stage and the residual surge energy is filtered and de-energized by the filtering capacitor in final stage.

Abstract: This invention relates to an isolator. Primarily, an insulation cover is inserted by a connector being disposed with a plug-in unit. At least one iron core is disposed around a tube at the other end of a connector. A front cover is connected with a fixing seat having a first space and a second space in which first and second ring capacitors are respectively received. An insulation sleeve is arranged between the first and second ring capacitors. One end of each ring capacitor is disposed with a circular spring correspondingly. The other end of the fixing seat is connected to an outer tube, the outer end of which is arranged with a terminal portion with a plug-in unit mounted therein. Thereby the simplified structure of the isolator with an isolated ground effect improves the impedance matching and has properties of better bandwidth flatness, lower insertion loss, and better return loss.

Abstract: A wave filter is installed in a multimedia wideband router, and includes a circuit board having a first low-pass wave-filtering circuit, and a band-pass wave-filtering circuit; the band-pass wave-filtering circuit consists of a high-pass wave-filtering circuit and a second low-pass wave-filtering circuit; the first low-pass wave-filtering circuit is connected to the high-pass wave-filtering circuit; the circuit board further includes an input terminal, and a first switching component, which is movable to such a position as to electrically connect the input terminal and a joint between the first low-pass wave-filtering circuit and the high-pass wave-filtering circuit; the circuit board further includes two output terminals, which are connected to the first and the second low-pass wave-filtering circuits respectively; a second switching component is provided on the circuit board, which is movable to such a position as to electrically connect the high-pass wave-filtering circuit and the second low-pass wave-filt

Abstract: An impedance matching wave filter includes an original wave filter and a match circuit. The match circuit is connected in parallel with the original wave filter and is able to be varied to produce impedance matching with the original wave filter in order to improve the condition of the return loss and to lower signal fading and signal distortion.