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Session: WEP2G2:00 PM Wednesday, June 18, 2008 Room: Hall A3 |
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Session: WEP2G | Interactive Forum: |
Chair: | Daniela Staiculescu, Georgia Institute of Technology |
Co-Chair: | Ronglin Li, Georgia Institute of Technology |
| | WEP2G-01 | Integrated Mixer based on composite right/left-handed leaky-wave antenna | 1655 | Y. Kim1, E. Kim1, A. Lai2, D. S. Goshi2, T. Itoh2, 1Kumoh National Institute of Technology, Gyungbuk, Republic of Korea, 2University of California, Los Angeles, United States |
| This paper presents a novel balanced mixer receiver front-end design based on a metamaterial structure applicable to differential-/common-mode excitation. This metamaterial structure functions as a leaky-wave antenna and provides intrinsic common-mode suppression. Low LO leakage and high RF to LO isolation are achieved without additional filters for the LO and RF paths. The metamaterial is based on a unit-cell which under a differential-mode excitation behaves like a composite right/left-handed (CRLH) metamaterial. In contrast, the metamaterial unit-cell is below cut-off under a common-mode excitation. Experimental results are used to verify the proposed metamaterial’s differential-/common-mode characteristics. The metamaterial is integrated with a balanced mixer design resulting in an operation frequency range of 1.96 GHz – 2.40 GHz with an optimum mixer conversion loss of 21.1 dB at 2.4 GHz. | | |
WEP2G-02 | Blind Source Separation of Human Body Motion using Direct Conversion Doppler Radar | 1759 | A. M. Vergara1, N. Petrochilos2, O. Boric-Lubecke1, V. Lubecke1, A. Høst-Madsen1, 1University of Hawai'i at Manoa, Honolulu, United States, 2University of Reims, Reims, France |
| Direct conversion Doppler radar can provide remote non-invasive monitoring of cardio-pulmonary activity of human subjects. However, real world life signs monitoring requires real-time processing of data over long monitoring periods, during which it is unlikely that the subject can be expected to suppress other body motion. Measurement of cardiopulmonary motion of a human subject with extraneous subject movement in the field of view of a Doppler radar system is a complex problem. The use of multiple antennas and blind source separation signal processing techniques is a logical approach for monitoring humans in real world conditions. Described here is the successful separation of cardiopulmonary motion and hand motion for a single subject. | | |
WEP2G-03 | A Self-Steering Array Using Power Detection and Phase Shifting | 1760 | J. M. Akagi, A. Zamora, M. K. Watanabe, W. A. Shiroma, University of Hawaii at Manoa, Honolulu, United States |
| A half-duplex self-steering array using power detection and phase shifting is presented. The system combines a phase-shifting array and an RF power-tracking control circuit to autonomously steer its beam toward the peak-power direction. Retrodirectivity is reported for angles of 0°, -15°, -30°, and +45° at a transmitting frequency of 6.5 GHz. | | |
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