Abstract
Notch filters are integrated in plasma diagnostic systems to protect millimeter-wave receivers from intensive stray radiation. Here we present a design of a notch filter with a center frequency of 140 GHz, a rejection bandwidth of ∼ 900 MHz, and a typical insertion loss below 2 dB in the passband of ±9 GHz. The design is based on a fundamental rectangular waveguide with eight cylindrical cavities coupled by T-junction apertures formed as thin slits. Parameters that affect the notch performance such as physical lengths and conductor materials are discussed. The excited resonance mode in the cylindrical cavities is the fundamental TE11. The performance of the constructed filter is measured using a vector network analyzer monitoring a total bandwidth of 30 GHz. We compare the measurements with numerical simulations.
© 2010 EURATOM
Original language | English |
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Journal | Review of Scientific Instruments |
Volume | 81 |
Issue number | 10 |
Pages (from-to) | 10D913 (5 pages) |
ISSN | 0034-6748 |
DOIs | |
Publication status | Published - 2010 |
Event | 18th Topical Conference on High-temprature Plasma Diagnostics - Wildwood, New Jersey, United States Duration: 16 May 2010 → 20 May 2010 Conference number: 18 http://htpd2010.pppl.gov/ |
Conference
Conference | 18th Topical Conference on High-temprature Plasma Diagnostics |
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Number | 18 |
Country/Territory | United States |
City | Wildwood, New Jersey |
Period | 16/05/2010 → 20/05/2010 |
Internet address |
Keywords
- Fusion energy