5G Millimeter‐Wave Radio Technology Gabriel M. Rebeiz Distinguished Professor at the University of California Wireless Communications Industry Endowed Chair ECE Department University of California, San Diego Tel: 858‐336‐3186 [email protected]Qualcomm/Ericsson 5G North American Workshop
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5G Millimeter‐Wave Radio Technology
Gabriel M. RebeizDistinguished Professor at the University of CaliforniaWireless Communications Industry Endowed Chair
They know what they want and build it in millions of units/year
Antenna Directivity: 30 dB
77 GHz 16-Element Phased Array with BIST
DC/ control pins
IF pins Bias, others
165x5.5 mm2
Measurements at 79-81 GHz (Scanning to +/-50o)
• Beam steering obtained for 100° field of view.
• Average sidelobe level < -17 dB up to 40o.
Beam 0° 12° 21o 32o 40o 48o
HPBW 5.5o 5.5o 6.0o 6.3o 7.0o 9.6o
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Measurements: 79 GHz Automotive Radar with phased array beam scanning
• Scan picture of car with door closed and door open.
Door Open
Door
No Door
Door Closed
(Car is ~25 meters from radar)
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6x10 cm2
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Wafer-Scale Phased Arrays
• High-efficiency antenna layer• Scalable up to 12(in)• First developed at UCSD
Silicon wafer
Antenna layer(e.g. Quartz)
Phased arrayelement
Trx/Baseband
6x6 mm2
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Do be afraid
(from rain!!!)
It will reduce your data rate!!
Rain attenuation dB/km
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6-12 dB/km for medium to heavy rain (70-80 GHz)
2-4 dB/km for medium to heavy rain (28 GHz) 55-60 dB
antenna gain
Alternative Solution: Beam Scanning with a Multi-Focal Lens
Single beam with switch or multiple beams with a transceiver on every antenna
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231.7‐2.5 GHz Tunable Filters and channelizers
500‐700 MHz tunable notch filter
Rebeiz Group: Antennas and Tunable/Cognitive Wireless Communications
DVC1DVC2 DVC3
DVC4
0 1 cm
0.7-2.2 GHz tunable antennas with 20 dB isolation between ports
Conclusion
Millimeter‐wave hardware is expensive in NRE, but can do be done in large numbers and then low cost CMOS, SiGe, GaAs pHEMT, GaN, packaging, antennas, etc. … are available. Not many people/groups know this stuff. This is not easy. Design techniques are getting better, but there is still (and will always be) some voodoo in RF Just figure out what you want first!!