Patent ID: 8150004
Filing Date: 2012-04-03
Classification: H03H

Abstract:
1. A filter circuit having a frequency response, said frequency response comprising: a low-pass portion at a frequency range less than a first frequency; the low pass portion comprising a first branch that passes forward path signals between a first node and a second node; a blocking capacitor connected between the second node and an output terminal; a flat loss portion at a frequency range between a second frequency and a third frequency, the flat loss portion comprising a third branch providing attenuation for return path signals connected between the first node and the second node; and a high-pass portion at a frequency range higher than a fourth frequency, the high-pass portion comprising a second branch that passes return path signals with no attenuation connected between the first node and the second node; the flat loss portion providing greater attenuation that the low-pass and the high-pass portions; wherein the fourth frequency is higher than the third frequency, which is higher than the second frequency, which is higher than the first frequency.