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Research work is related to RF/microwave circuits and systems:
- Inkjet/3D printed circuits for energy, sensing and commucation
- Ambient backscattering
- RFID and low power sensor design and energy harvesting and wireless power transfer techniques.
- Flexible electronics, textile antennas
- Substrate Integrated Waveguides (SIW) and circuits
- Power amplifier design and thermal energy harvesting from power amplifiers.
- Oscillators and coupled oscillator arrays
- Phased array antennas, retro-directive antennas and rectifying antennas.
Ambient FM back-scattering demo (by my Ph.D. student Spyros Daskalakis)
Energy harvesting and solar-antennas
24GHz SIW rectenna
Multi-band flexible solar rectenna on PET substrate
RFID pasive solar TAG
Dual polarized 2.45GHz patch rectenna (front)
Dual polarized 2.45GHz patch rectenna (back)
Flexible PET 920 MHz active beacon oscillator antenna
Thermal energy harvesting from a power amplifier
Dual band (2.55GHz and 3.45GHz) meta-material based 1W power amplifier
Half-mode SIW power amplifier
5 Watt, 2.4 GHz power amplifier
Sample videos of electromagnetic (EM) harvesting demo experiments
using an UWB monopole antenna and a broadband rectifier in CTTC:
....from a mobile phone
.... and from a microwave oven
The maximum harvested power was about 25uW.
RFID tags integrated in cork stoppers
Painted (silver ink) 866MHz RFID tag
Painted (silver ink) passive retro-directive tag
UHF folded slot antenna inkjet printed on paper (courtesy of Georgia Tech, first prototype 2010)
Active and passive SIW circuits
C-band flexible SIW slot array on PET substrate
C-band flexible SIW filter on PET substrate
X-band compact active antenna oscillator
X-band compact active oscillator array (top-active circuit)
X-band compact active oscillator array (bottom-antenna)
X-band Cavity backed patch antenna
X-band Cavity backed slot antenna
2x1 Slot Antenna Array
X-band Oscillator
29 GHz Push-push Oscillator
24 GHz SIW array, courtesy of Tomas Mikulasek, visiting from Brno University of Technology, CZ
24 GHz SIW array (top side - slot coupled patch array)
24 GHz SIW array (anechoic chamber)
Oscillators and arrays
Triple push oscillator with 2 GHz fundamental frequency
UWB CMOS VCO
4x4 6GHz active antenna coupled oscillator array
X-band 2nd harmonic coupled oscillator array antenna
S-band self-oscillating mixer (SOM) retrodirective array
...and finally, some pictures from my Ph.D. work at UMass (long ago!)...
2.4 GHz tranceiver using off-the-shelf components
Receiver early prototype photo
Receiver photo
Measured QPSK eye pattern at 10MBPS
Outdoor BER measurements
Two versions of the receiver board are shown followed by an eye pattern taken using 5 MSPS QPSK modulation. A corresponding transmitter board was designed and the system was used as a bit error rate test-bed. One of many outdoor measurements is shown taken at the UMASS Amherst campus, outside Marcus Hall, back in 2001 !
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