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No ‘twistflex’ required
Wojtkowiak points out that this reduction of higher order modes greatly
reduces the minimum bend radius. “Not only does this solution practically
address the 27.5 to 29.5 GHz band, it has permitted us to reduce the
conventional minimum bend radius to half that listed for the EO38!”
As a result, the final engineered solution avoids the use of conventional
‘twistflex’ assemblies often used to accommodate tighter bends.
These are costly, prone to movement and sources of attenuation.
As this solution is based on overmoded waveguide, attenuation is also
dramatically reduced—just 21dB per 100 metres length.
“What we have now is a waveguide solution for the 28GHz band based
on RFS FLEXWELL 38GHz overmoded waveguide,” Wojtkowiak said. “The
attenuation is around half that of a purpose-designed waveguide at this
frequency, and the flexibility ensures ‘twistflex’ assemblies
aren’t required.”
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RFS’s
FLEXWELL elliptical waveguide is a practical, cost-effective alternative
to conventional rigid waveguide systems. Constructed of longitudinally
continuous seam-welded copper tube, it is corrugated and precision
formed into an elliptical cross-section.
