2.4 GHz CubeSat Communications System Overview

The 2.4 GHz CubeSat Communications System, led by Robert Bui, aims to establish a reliable data link between the SDS-1 Cube Satellite and the ASU ground station. Operating on the 13 cm amateur ham radio band at frequencies of 2400-2450 MHz, the system utilizes a Transceiver (MHX-2420) with a link rate of 19.2-230.4 kbps. The SDS-1 system includes a Patch Antenna and Ground Station setup, with plans for further testing and integration in the future.

• CubeSat
• Communications System
• SDS-1
• Ground Station
• Patch Antenna

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1. 2.4 GHz CubeSat Communications System Robert Bui Communications Subsystem Lead http://sdsl.club.asu.edu/

2. Overview Communications System Overview SDS-1 Communications Description Ground Station Description Link Budget Summary The SDS-1 Cube Satellite 2

3. Objective Create and ensure a reliable data link between the SDS-1 and the ASU ground station for transmitting and receiving telemetry, commands and photos. Operate using the 13 cm amateur ham radio band at the frequencies of 2400-2450 MHz. 3

4. SDS-1 Communications System Transceiver (MHX-2420) Link Rate: 19.2 - 230.4 kbps Frequency: 2.4000- 2.4835 GHz (FHSS) Transmit and Receive Bandwidth: 280 kHz Sensitivity: -107 dBm FEC and 32 bits CRC Max Output Power: 1 W MHX-2420 (Courtesy of Microhard Systems Inc.) 4

5. SDS-1 Communications System Patch Antenna (30 mm x 30 mm) Expected Gain: 6 dBi (Boresight) 4 dBi ( 30 ) 0 dBi ( 60 ) Circularly Polarized Radiation Pattern of the Patch Antenna 5

6. SDS-1 Communications System Patch Antenna Composition of the Patch Antenna Front Side Back Side 6

7. Ground Station Two 30 dBi Dish Antennas Linearly Polarized Beam Width: 5.3 Azimuth/Elevation Rotators Tracking Software MHX-2420 Ground Station Design 7

8. Link Budget Summary Orbit Altitude 350 km Without LNA Space Craft Elevation Angle Received Signal Strength MDS Link Margin With LNA deg dBm dBm dB 10 45 90 -110.3 -107 -3.3 -101.7 -107 5.3 -98.9 -107 8.1 Space Craft Elevation Angle Received Signal Strength MDS Link Margin deg dBm dBm dB 10 45 90 -112.3 -116 3.7 -103.7 -116 12.3 -100.9 -116 15.1 8

9. Future Work Test patch antenna in ASU s EMAC facility and finalize design. Assemble ground station. Perform communication tests between the ground station and patch antenna. Integrate the patch antenna with the SDS-1. 9

10. Questions or Comments? Name: Robert Bui Website: http://sdsl.club.asu.edu/ Email: sdsl@asu.edu or robert.bui@asu.edu 10