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Broadband notch filter design for millimeter-wave plasma diagnostics.

V Furtula¹, P K Michelsen, F Leipold

¹Association Euratom-Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000 Roskilde, Denmark.

The Review of Scientific Instruments

|November 2, 2010

Summary

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We designed a 140 GHz notch filter using a rectangular waveguide and cylindrical cavities to shield plasma diagnostic systems from stray radiation. This filter offers a narrow rejection band and low insertion loss, crucial for sensitive millimeter-wave receivers.

Area of Science:

Physics
Electrical Engineering
Plasma Science

Background:

Plasma diagnostic systems require protection against intense stray radiation.
Millimeter-wave receivers are particularly vulnerable to interference.
Notch filters are essential components for signal integrity in these systems.

Purpose of the Study:

To present a novel design for a 140 GHz notch filter.
To optimize the filter for plasma diagnostic applications.
To characterize filter performance, including center frequency, rejection bandwidth, and insertion loss.

Main Methods:

Design based on a fundamental rectangular waveguide with eight coupled cylindrical cavities.
Utilized T-junction apertures as thin slits for coupling.

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Investigated the impact of physical lengths and conductor materials on performance.

Excited the fundamental TE(11) resonance mode within the cavities.

Main Results:

Achieved a center frequency of 140 GHz.
Obtained a rejection bandwidth of approximately 900 MHz.
Demonstrated typical insertion loss below 2 dB in the ±9 GHz passband.
Validated design through vector network analyzer measurements across a 30 GHz bandwidth.

Conclusions:

The designed notch filter meets the stringent requirements for protecting millimeter-wave receivers in plasma diagnostics.
The T-junction coupled cavity design offers effective stray radiation suppression.
Experimental results align well with numerical simulations, confirming design validity.