Developed for electronic warfare (EW) systems, Teledyne RF & Microwave offers a family of three tunable notch filters that use its patented shunt yttrium iron garnet (YIG) technology. Because YIG spheres have such high Q, Teledyne’s YIG filters achieve “super notch” performance: greater rejection over a narrower bandwidth than other notch filters, including competing YIG filters.

The three models in Teledyne’s family of band reject filters provide notches across 0.5 to 3 GHz (model F3874), 2 to 6 GHz (F3875) and 2 to 20 GHz (F4002), with 40 dB rejection bandwidths of 6, 30 and 22 MHz, respectively. The 3 dB notch bandwidths are from 50 to 90 MHz (depending on the center frequency) for the F3874, 150 MHz for the F3875 and 160 MHz for the F4002. The typical passband insertion loss is 1.5 to 1.9 dB, less at the lower bands, as expected.

The frequency of the filter’s notch is tuned with a current source, which has a typical tuning sensitivity of 10, 20 and 20 MHz/mA for the three models. The YIGs use a built-in heater, which is biased with 28 V and draws a steady state current of approximately 150 mA. Over the 0°C to +70°C temperature range, the temperature drift is 10 MHz for the F3874 and F3875 models and 20 MHz for the F4002.

Teledyne RF & Microwave also offers oscillators and bandpass filters that use its YIG technology, as well as a complete line of RF/microwave components for aerospace and defense: e.g., amplifiers, switches, power dividers, mixers and circulators.

Teledyne RF & Microwave
Mountain View, Calif.
www.teledynemicrowave.com