Challenges DRISHTI
Two-Channel Hybrid Rotary Joint (WR75 SMA) for Polarization Axis of SATCOM-on-the-Move Antenna Systems
To design and manufacture a two-channel hybrid rotary joint consisting of:
● Channel-1: WR75 waveguide interface operating in 13.75–14.5 GHz Ku-band with power handling capability of 100 W and insertion loss ≤ 0.2 dB.
● Channel-2: Coaxial SMA interface operating in L-band (950–2150 MHz) supporting RF, 10 MHz reference and DC supply, with insertion loss ≤ 0.5 dB.
● It must be form-compatible with the existing POL axis mounting and fit within the maximum height of 78mm.
The rotary joint shall support continuous 360° rotation and be compact enough to integrate within a 0.4 m SOTM antenna system.
Application: Polarization axis of SATCOM-on-the-Move (SOTM) antenna system.
SATCOM-on-the-Move (SOTM) antenna systems require continuous polarization rotation to maintain communication with the satellite. The RF signals must pass across the rotating interface between the stationary electronics and the rotating antenna assembly.
Currently BEL is attempting to develop required rotary joints through imported supplier. However, working module has not yet been realised. Development of compact hybrid rotary joint capable of transmitting Ku-band RF power through waveguide and L-band signals through coaxial interface across a continuously rotating axis will enable reliable system operation.
The rotary joint will be integrated into the polarization axis of SATCOM-on-the-Move antenna systems used for any mobile satcom application.
Platform applications include:
• Submarine mast mounted SATCOM systems
• Land mobile SATCOM systems
• Rail mobile SATCOM terminals
• Larger antenna systems such as 1 m and 1.5 m SATCOM antennas
The rotary joint enables continuous polarization rotation while maintaining RF connectivity between stationary and rotating antenna subsystems.
Design, development and testing of a two-channel hybrid rotary joint consisting of:
• WR75 waveguide rotary joint for Ku-band transmit path
• SMA coaxial rotary joint for L-band receive path
Scope:
• RF design
• mechanical design
• precision manufacturing
• RF characterization
• environmental testing
Deliverables:
• Prototype rotary jointTo design and manufacture a two-channel hybrid rotary joint consisting of:
● Channel-1: WR75 waveguide interface operating in 13.75–14.5 GHz Ku-band with power handling capability of 100 W and insertion loss ≤ 0.2 dB.
● Channel-2: Coaxial SMA interface operating in L-band (950–2150 MHz) supporting RF, 10 MHz reference and DC supply, with insertion loss ≤ 0.5 dB.
● It must be form-compatible with the existing POL axis mounting and fit within the maximum height of 78mm.
The rotary joint shall support continuous 360° rotation and be compact enough to integrate within a 0.4 m SOTM antenna system.
Application: Polarization axis of SATCOM-on-the-Move (SOTM) antenna system.
SATCOM-on-the-Move (SOTM) antenna systems require continuous polarization rotation to maintain communication with the satellite. The RF signals must pass across the rotating interface between the stationary electronics and the rotating antenna assembly.
Currently BEL is attempting to develop required rotary joints through imported supplier. However, working module has not yet been realised. Development of compact hybrid rotary joint capable of transmitting Ku-band RF power through waveguide and L-band signals through coaxial interface across a continuously rotating axis will enable reliable system operation.
The rotary joint will be integrated into the polarization axis of SATCOM-on-the-Move antenna systems used for any mobile satcom application.
Platform applications include:
• Submarine mast mounted SATCOM systems
• Land mobile SATCOM systems
• Rail mobile SATCOM terminals
• Larger antenna systems such as 1 m and 1.5 m SATCOM antennas
The rotary joint enables continuous polarization rotation while maintaining RF connectivity between stationary and rotating antenna subsystems.
Design, development and testing of a two-channel hybrid rotary joint consisting of:
• WR75 waveguide rotary joint for Ku-band transmit path
• SMA coaxial rotary joint for L-band receive path
Scope:
• RF design
• mechanical design
• precision manufacturing
• RF characterization
• environmental testing
Deliverables:
• Prototype rotary joint
• Test reports and methodology.
• Test reports and methodology.
