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Session: THP2F2:00 PM Thursday, June 19, 2008 Room: Hall A3 |
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Session: THP2F | Interactive Forum: |
Chair: | Daniela Staiculescu, Georgia Institute of Technology |
Co-Chair: | Ronglin Li, Georgia Institute of Technology |
| | THP2F-01 | Gunn Oscillator Modeling and Second Harmonic Output Power Optimization at 76 GHz | 1028 | T. Kiuru1, A. M. Safwat2, J. Mallat1, A. V. Räisänen1, 1TKK Helsinki University of Technology, Espoo, Finland, 2Ain Shams University, Cairo, Egypt |
| A combined full-wave/circuit simulator model for a coaxial cavity Gunn oscillator is developed. The Gunn oscillator utilizes the second harmonic for the output power generation at 76 GHz. The model is validated with reflection coefficient and output power measurements. This combined model provides accurate and fast Gunn oscillator cavity design. | | |
THP2F-02 | Application of Terahertz Imaging to Osteoarthritis | 1115 | E. Pickwell-MacPherson1, K. Kan1, W. Lee2, V. P. Wallace3, L. W. Cheung2, 1Chinese university of Hong Kong, Hong Kong, Hong Kong, 2Chinese university of Hong Kong, Hong Kong, Hong Kong, 3University of Western Australia, Perth, Australia |
| Osteoarthritis (OA) is the most common form of arthritis, caused by the breakdown of cartilage. A quantitative approach to monitor articular cartilage is a pressing need. Here, using a rabbit model, we investigate the potential use of terahertz pulsed imaging to determine the variation in cartilage thickness due to OA. We find that our terahertz image data can be used to quantitatively show variation in the cartilage thickness in excised tissue. | | |
THP2F-03 | Full Coverage Millimeter Wave Primary Noise Standards for 18-170 GHz | 1212 | D. R. Vizard1, P. Foster3, B. Lunn2, S. Cherry1, 1Vivatech Ltd , Nice, France, 2Amideon Ltd, Limerick, Ireland, 3Maas Ltd , Malvern , United Kingdom |
| Conventional noise diode transfer standards used in the calibration of sensitive radiometers and other low noise components or instruments can produce large errors due to limitations of frequency coverage and absolute accuracy. The Cryogenic Noise Calibration Standard described features interchangeable waveguide based horn antennas allowing full frequency coverage from 18-170 GHz and beyond. The state-of-art design of the vessel and its temperature profile allows the effects of stray radiation to be controlled within the required accuracy specifications. | | |
THP2F-04 | 60GHz High Isolation SPDT MMIC Switches Using Shunt pHEMT Resonator | 1233 | Y. Tsukahara, H. Amasuga, S. Goto, T. Oku, T. Ishikawa, Mitsubishi Electric Corporation, Itami, Afghanistan |
| This paper describes the successful development of a 60GHz high isolation SPDT MMIC switch for wireless applications. In order to improve the isolation, the shunt pHEMT resonator, which is reduced on-state resistance of FET, is proposed. The developed V-band SPDT switch shows an isolation of over 45 dB and an insertion loss of 1.4 dB at 60 GHz. Input and output return losses are better than 18 dB in ON-state. Moreover, the switch requires no complex off-chip bias circuitry and consumes no DC power. These performances of high isolation and low insertion loss presented here are the best among the V-band pHEMT MMIC switches. | | |
THP2F-05 | A Heterostructure Barrier Charge Swing device for frequency multiplication at 306 GHz | 1371 | B. I. Nicolae1, M. Ruf2, J. Schür2, L. Schmidt2, H. L. Hartnagel1, 1Technical University of Darmstadt, Darmstadt, Germany, 2University of Erlangen-Nuremberg, Erlangen, Germany |
| A new type of frequency multiplier which is called Heterostructure Barrier Charge Swing (HBCS) is proposed. It concerns a bunch of charge carriers swinging in a trough between heterojunction barriers. The behavior of the device is simulated and experimentally verified. Efficiencies of 27% for tripler and 14% for quintupler operation are predicted. A split-block mount with planar circuitry is presented to prove tripler operation capabilities from 102 GHz to 306 GHz. | | |
THP2F-06 | Ka-Band Surface-Mount Directional Coupler Fabricated using Micro-Rectangular Coaxial Transmission Lines | 1545 | K. J. Vanhille1, J. Rollin1, S. Rondineau2, J. W. O'Brien2, J. L. Wood3, S. Raman3, Z. Popovic2, 1Rohm and Haas Electronic Materials, Blacksburg, United States, 2University of Colorado, Boulder, United States, 3Virginia Tech, Blacksburg, United States |
| 2.5-dimensional, 10-dB and 20-dB directional couplers, are designed and fabricated using air-core rectangular coaxial transmission line. The couplers are both smaller than 1.8 by 4.2mm2 with probing points. The measured performance of the coupler is in agreement with full-wave simulations. The components are designed such that probing or flip-chip attachment can be done with the same structures. The integration of AuSn solder, as well as, the transition from rectangular coax to traditional co-planar waveguide is also presented. | | |
THP2F-07 | A W-band Quasi-optical Homodyne Doppler Radar for Detection of Very Slow-Moving Targets | 1628 | J. Y. Suen, R. S. Singh, Z. D. Taylor, E. R. Brown, University of California, Santa Barbara, United States |
| A simple homodyne, quasi-optical W-band (99 GHz) Doppler radar utilizing free-space optics to reduce the number of expensive mm-wave components was designed, assembled, and characterized. The system exploited the low 1/f noise and high responsivity of a zero-bias Schottky diode detector. Target velocity as slow as 1.3 mm/sec was measured with a resolution of 94 µm/sec and an detection time of 16 seconds. A SNR greater than 20 dB was measured, off a target with a radar cross section of 11.3 cm2 at a 1 m range and a total source power of -10 dBm, and was also detected with a target power as low as -26 dBm. From our measurements, a 1/f noise-limited maximum range was found to be 3.6 m at a total power of -10 dBm. | | |
THP2F-08 | A CMOS-Compatible Schottky-Barrier Diode Detector for 60-GHz Amplitude-Shift Keying (ASK) Systems | 1689 | M. Ko, H. Kang, W. Choi, Rm. B629, High-Speed Circuits & Systems Laboratory, Seoul, Republic of Korea |
| A square-law detector for 60-GHz amplitude-shift keying (ASK) systems is implemented by using CMOS-compatible Schottky-barrier diodes (SBDs). The SBDs fabricated in the 0.18-μm CMOS technology have the cut-off frequency of 250 GHz. The fabricated detector has minimum conversion loss of 23.7 dB at the input carrier and RF power of -3 dBm, and has 3-dB bandwidth of 3 GHz. Using the fabricated detector, 622-Mb/s data transmission in the 60-GHz ASK system is demonstrated with 60-GHz variable attenuators instead of antennas. The bit error rate of 10-10 is achieved at the calculated propagation distance of 1.3 meter, and 10-6 at 2.5 meters, assuming the Tx and Rx antenna gain of 24 dBi. | | |
THP2F-09 | Average Capacity of Wireless Optical Communication Systems over Gamma Gamma Atmospheric Turbulence Channels | 1162 | H. E. Nistazakis1, G. S. Tombras1, A. D. Tsigopoulos2, E. A. Karagianni2, M. E. Fafalios2, 1University of Athens, Athens, Greece, 2Hellenic Naval Academy, Piraeus, Greece |
| Optical Wireless Communication (OWC) systems are rapidly gaining popularity as effective means of transferring data at high rates over short distances. OWC facilitates rapidly deployable, lightweight, high-capacity communication without licensing fees and tariffs. Nevertheless, the performance of this new technology depends strongly on the atmospheric conditions and the characteristics of the link. In this work, the influence of the above parameters at the average (ergodic) capacity of an OWC system is studied. | | |
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