Title:
Dielectric Travelling Wave Antennas Incorporating Cylindrical Inserts with Tapered Cavities
Author(s):
Gunnar Armbrecht, Eckhard Denicke, Nils Pohl, Thomas Musch, Ilona Rolfes
Source:
EuCAP 2009
Vol./Issue/Date:
23.03.2009
Year:
2009
Page(s):
Keywords:
Dielectric antennas, endfire antennas, radar
distance measurement, travelling wave antennas, cavities
Abstract:
Dielectric antenna solutions for industrial radar
level measurements are presented to provide monostatic radar
operation from 8.5 to 10.5 GHz. Size limited directional antennas
having low side lobe levels and marginal ringing properties are
needed. Therefore, circular waveguide-fed travelling wave antennas
for endfire radiation, incorporating cylindrical dielectric
inserts solely made of PTFE (Teflon), are evaluated. Tapered cavities
inside the inserts lead to a smoothly raising field expansion far
beyond the maximal geometrical antenna diameter. This yields
directivity improvements in comparison to a solely radiating
conical horn aperture of the same size. A significant length
reduction compared to numerically optimized common dielectric
rod antennas is achieved as well. Finally, the obtained accuracy
gain assuring high-precision radar distance measurements even
in the presence of a parasitic reflector scenario is clarified.
Document:
Reference Id:
485
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