The L-band HPA module designed, manufactured and tested in the frame of this study has proven its ability to deliver high output power at L band over 50W with efficiency above 60%. These excellent performances made it a perfect candidate to high power SSPA equipment dedicated to Telecom applications. Thus, based on this L-band GH50 HPA module, EM GaN SSPA equipment brings many benefits compared to LTWTA solution and GaAs SSPA solution:
- Improved electrical performances with multi-carrier signal
- Higher operating temperature: 85°C instead of 65°C
- Mass reduction of 66% compared to a L-band LTWTA solution
- Footprint reduction of 65% compared to a L-band LTWTA
- Simplified implementation during payload integration
- Cost reduction compared to LTWTA solution
This competitive EM GaN SSPA equipment is able to address the entire renewal market of constellations of mobile communications satellites.
For Ku-band applications, the introduction of Ku-band GH25 HPA module developed in this study, has been analysed on two types of equipment: SSPA and LC-SSPA
Regarding a 20W Ku-band SSPA based on a single GaN HPA module developed in this study, the comparison between GaAs and GaN SSPA equipment versions shows important improvements and points to be addressed further:
- Improvement of PAE performance: +7 to 10 points
- Footprint reduction : -28%
- Mass reduction: -20%
- Cost reduction estimation: -17% in comparison with the 20W Ku-band GaAs SSPA using 2 HPA modules.
Regarding a 160W Ku-band LC-SSPA based on 8x GaN HPA modules and low loss space combiner technique, the comparison with LC-TWTA show mitigate results for LC-SSPA in particular for electrical performance. It is then clear that a GH25 based LC-SSPA presents insufficient electric performances (low PAE and reduced frequency bandwidth) and that a technological breakthrough is required to increase this performance (Pout/PAE/NPR/Instantaneous frequency bandwidth).