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"Inventing For Tomorrow"
FREQUENCY PROGRAMMABLE
NOTCH FILTERS
Direct frequency filtering for selective interference suppression
PRODUCT OVERVIEW
IMPLEMENTATION IN ACTION
ABOUT
A notch filter is a type of band-stop filter, which is a filter that attenuates frequencies within a specific range while passing all other frequencies unaltered. For a notch filter, this range of frequencies is very narrow.
ARS’s Frequency Programmable Notch Filters (FPNF) are designed to reduce radio front-end desensitization by selectively attenuating strong signals.
THEORY
The ARS Frequency Programmable Notch Filters (FPNF) uses a straight-forward traditional filter design. Specifically, the use of pole and zero manipulation to generate notches.
IMPLEMENTATION
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Frequency Programmable Notch Filters (FPNF) are the most basic technology of the interference reduction architectures.
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The unit consists of variable capacitors and variable inductors that are electrically tuned to the selected notch frequency.
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The FPNF is located between the antenna and the receiver (RX).
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Typically FPNF's are reflective, they represent a short circuit at the notch frequency.
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There are specialized FPNF's that are absorptive, but they are larger and more costly than the reflective versions.
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Notches can be set to any frequency.
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USABLE RANGE WITHOUT FILTER
NOTCH
USABLE RANGE WITH FILTER
APPLICATIONS
Model 730 (Programmable Notch Filter System) is a modular chassis that contains up to sixteen modules of user settable notch filters in a single 4U chassis.
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Customers can configure any combination of notch filter modules.
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Model 730 utilizes a simple ASCII based command set.
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RS-485 operation supports multiple addressing.
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LAN operation utilizes TCP/IP and supports DHCP or static addressing.
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Model 730 allows users to blend a mix of frequency ranges into one chassis.
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Each individual notch filter also has a bypass mode to reduce the insertion loss when a filter is not in use
The High Frequency module (730H) contains two independent channels with two user controllable notch filters in each channel.
