Ka‐band waveguide rotary joint

Abstract

The authors present a design of a waveguide rotary joint operating in Ka‐band with central frequency of 33 GHz, which also acts as an antenna mount. The main unit consists of two flanges with a clearance between them; one of the flanges has three circular choke grooves. Utilisation of three choke grooves allows larger operating clearance. Two prototypes of the rotary joint have been manufactured and experimentally studied. The observed loss is from 0.4 to 0.8 dB in 1.5 GHz band.

Ku Band Rotary Joint Design for SNG Vehicles

“…Design and development of rotary joints have been reported in [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. A single channel RJ presented in [1] consists of two septum polarizers.…”

“…They have designed a six channel RJ by using transition between concentric coaxial lines and double-ridged waveguides. Detailed choke design for coaxial waveguides are presented in [15], [16]. In [16] Ka band rotary joint is designed with additional physical capability which can carry 2 kg antenna but the band width is only 1.5 Ghz.…”

Synthesis of open structures starting from closed‐cross‐section waveguide devices

“…The proposed work is based on completely open structures made out from two monolithic pieces separated by a gap along with the entire structure with the aim of avoiding flanges and joins between pieces of waveguides. On the contrary, quarter‐wavelength chokes are used (especially at high frequency) to guarantee a good equivalent short circuit in the junction between two consecutive standard ‘closed’ cross‐cross section waveguides [29]. Additionally, while the quarter‐wavelength RF‐choke physical length depends on the working wavelength and care must be given to choose the design working frequency, in our approach, the gap lateral extend is not a critical parameter and also the gap size g has undemanding requirements, that is .…”

Design of a Ku-Band High-Purity Transducer for the TM01 Circular Waveguide Mode by Means of T-Type Junctions

“…For example, the TE 21 and TM 01 modes are used in tracking systems for satellite communications [4]- [6]. Modes with azimuthal symmetry like TM 01 and TE 01 are essential in rotary joints to provide continuous rotating movement about the principal axis, preserving the electrical performance [7]- [10]. The circular waveguide TE 01 mode has some special properties that make it suitable for low-loss transmission systems.…”