Accession Number : AD0478704


Title :   MICROWAVE ROTARY JOINTS FOR X-, C-, AND S-BAND


Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OH


Personal Author(s) : Nicholson, Basil J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/478704.pdf


Report Date : 30 Nov 1965


Pagination or Media Count : 50


Abstract : This report consists of an examination of post-1950 rotary joint designs for use at X-, C-, and S-bands. Among the topics discussed are single and multichannel rotary joints with coaxial line or rectangular waveguide inputs. Since the simplest waveguide rotary joints incorporate transitions from rectangular to circular waveguide or from rectangular waveguide to a coaxial line, calculations are included on the relative power-handling capabilities of circular waveguide, rectangular waveguide, and coaxial line when subject to the conditions necessary for proper functioning of a rotary joint. A detailed examination is made of rectangular waveguide joints of the coaxial line, circular waveguide, coaxial mode converter, and of the annular varieties. It is shown that, in the circular waveguide variety, either a circularly polarized H(11) mode or an E(01) mode can be used. Methods of avoiding undesirable performance due to resonances in the circular waveguide are discussed. Methods are described of using circular waveguide rotary joints for dual-channel applications.


Descriptors :   *ANTENNA FEEDS , *COUPLED ANTENNAS , *RADAR ANTENNAS , *WAVEGUIDE COUPLERS , ANTENNA COMPONENTS , BROADBAND , C BAND , CASCADE STRUCTURES , COUPLING CIRCUITS , RESONANCE , S BAND , WAVEGUIDE CIRCULATORS , X BAND


Subject Categories : Electrical and Electronic Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE