Patent ID: 8860533

Claim:
A low pass filter, comprising: a first port; a second port; a substantially linear strip shaped signal transmission line connected between the first port and the second port, and operable to transmit radio frequency signals from the first port to the second port, the signal transmission line defining a first side and a second side opposite to the first side; a first open stub disposed on the first side of the signal transmission line and perpendicularly connected to a part of the signal transmission line adjacent to the first port; a second open stub disposed on the first side of the signal transmission line and perpendicularly connected to another part of the signal transmission line adjacent to the second port, the second open stub and the first open stub co-defining a T-shaped gap; a first coupling line parallel to the signal transmission line and disposed in the T-shaped gap, the first coupling line defining a first via; and a second coupling line parallel to the signal transmission line and disposed on the second side of the signal transmission line, the second coupling line defining a second via.