Abstract
9-km waveguides of 70-ram inner diameter (ID) have been inserted from manholes into ducts of polyvinal chloride (PVC). Expansion joints are provided for taking up length variations. Only a slight increase in attenuation was measured for the helix waveguide after the laying works. Phase-shift-keyed (PSK) signals with bit rates of up to 640 Mbit/s have been transmitted via this line. A new approximation method for calculating the attenuation of practical line routes has been developed. Improved design of lined waveguides should, from theory, reduce the H 01 route and curvature loss to below 1 dB/km. Experimental repeaters work with a double conversion scheme. They have mm-wave branching networks in oversize rectangular waveguide, IMPATT oscillators and p-i-n modulators for two-phase modulation. Printed or folded tape meanderlines serve for delay equalization.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
