Accurate Design of a Notch Fil...

Accurate Design of a Notch Filter Using Electromagnetic SimulatorsAccurate Design of a Notch Filter Using Electromagnetic Simulators
Circuit simulation and EM analysis are combined to achieve the desired performance

By M. Sankara Narayana and Neeta Gogia Defense Electronics Research Laboratory
trong interfering signals pose problems to receivers operating over a wide frequency band, as in the case of EW receivers. Unwanted signals at known frequencies can be suppressed using notch filters with sufficiently high rejection. A low cost notch filter has been designed with 25 dB minimum rejection at f0 = 13.2 GHz with 50 MHz bandwidth. The circuit was designed and analyzed using the circuit simulator Libra and the layout was analyzed using an electromagnetic simulator, Momentum (HP-ADS from Agilent Technologies). A prototype was developed in microstrip confi