Simulation and realization of bandpass filter (BPF) 456 MHz using thick film technology substrate-based alumina

A research a band-pass filter module uses technology based film thick alumina substrate with the major components using SMT (surface mount technology). With a 60 MHz bandwidth, the −3 dB cutoff signal at a frequency of 486 MHz for the tape top side, as well as for the 426 MHz frequency band lower side. To produce the steepness of the above −30 dB and ripple 0.1 dB the pass-band region, the filter design using a seven pole with family order Butterworth filter used. To lower the cutoff frequency, stopband width (Fs) is designed about 20% at a frequency of 340.8 MHz, with stop-band depth (As) of about −40 dB. As for the upper cutoff frequency, stopband width (Fs) designed about 20% at a frequency of 583.2 MHz, with stopband depth (As) of about −40 dB. Using the components of surface mount technology (SMT), then generated band-pass filter module with small dimensions, compact and has a high Q. In this stage of the simulation, software used Elsie tonne of software version 2.72, the design process of printed circuit board (PCB) using Protel 99SE, while the phase measurements using a Vector Network Analyzer R3770 Advantest type with a frequency range between 300 kHz to 20 GHz. These filters have been using in radar applications ISRA (Indonesian Sea Radar) with good results.