General Electronic Devices
Manufacturer of Quartz Crystals, Oscillators and Filters
(760) 979-1441 • 320 South Pacific St., San Marcos, CA 92078

Sub 1GHz Filter Demonstration

Parameter Min Typ Max Units
IL@434MHz   0.4 0.6 dB
IL@300MHz 30     dB
IL@600 45 50   dB
Ultimate rej.   60   dB
RL in-band     20 dB
Power Handling     50 W
Dimensions 60x20x20 mm^3
Operating Temp. -30 25 85

*Rejection guaranteed up to 1.5GHz.

Figure 1 - Typical BPF performance

The ISM BPF is a highly robust design with a fractional BW between 10 to 15% of its center frequency. Though its main application is 434MHz ISM band, the design allows to be tuned for applications in the 330 to 520MHz frequency range, while delivering performance, ease of manufacturing, repeatability and reliability in a same package.

Parameter Min Typ Max Units
IL@108MHz   0.8 1 dB
IL@88MHz 0.4     dB
IL@176 60     dB
Ultimate rej.   60   dB
RL in-band     -20 dB
Power Handling     100 W
Dimensions 65x25x25 mm^3
Operating Temp. -30 25 85

*Rejection guaranteed up to 0.5GHz.

Figure 2 - Typical LPF performance

The FM Broadcast LPF is intended for FM radio transmitter (medium power) applications. Its main use is, harmonic rejection of HPA's in the FM transmitters. Its main advantage is its small size, ease of manufacturing, repeatability and reliability.