Fast Tuned Notch Filters

Fast Tuned

Notch Filter

Teledyne Defence & Space’s (TDS) range of Fast Tuned Notch Filters (FTNF) have been designed to protect Electronic Support Measures (ESM) receivers from high duty cycle, frequency agile interference produced by on board (or cohort) combat radar systems. ESM sensors often need protection from high power nearby radars, and such signals can reduce receiver dynamic range.

Approach	Disadvantages
Synchronous blanking of the ESM sensor	Probability of intercept of the ESM receiver is compromised when operating near a high duty cycle radar. Multiple emitters on the same platform compounds the problem
Front-end filtering of the radar pulses in the ESM sensor	Band-stop filters leave ”holes” in ESM sensor spectral coverage YIG tuned filters are too slow to keep up with modern agile radar

TDS FTNF can track the emitter’s transmissions at its agility rate, ensuring that the ESM sensor’s
Probability of Intercept is maintained at an acceptable level.

PRODUCT	APPLICATIONS
ES005 - Fast Tuned Notch Filter	ESM Receiver Protection Radar Front End & TR Modules Direction Finding (DF) System Protection EW (ESM)

Features & Benefits

Modules for both S- and X-band coverage
Dual, independently controlled notches
Digital Tuning Control with fast tuning speed (<250ns)
High rejection level

Quickly switches from notch to all-pass
Low loss in all-pass state
Can be cascaded
Good power handling