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The branch-line coupler may be redesigned for crossover application. The bandwidth of such a coupler can be extended by suitably incorporating additional sections into the composite design. Laboratory tests on microstrip prototypes have shown the return loss and isolation of the three- and four-section couplers to be better than 20 dB over bandwidths of 22%(More)
GOAL We propose a novel wireless fully passive neural recording device for unobtrusive neuropotential monitoring. Previous work demonstrated the feasibility of monitoring emulated brain signals in a wireless fully passive manner. In this paper, we propose a novel realistic recorder that is significantly smaller and much more sensitive. METHODS The(More)
A fully-passive and wireless neurosensing system is presented for acquisition of very-low-power brain signals. The system can detect neuropotentials as low as 50&#x03BC;V<sub>pp</sub> in frequency-domain. This is an improvement of up to 22dB in sensitivity compared to previously reported neuropotentials. Importantly, it implies reading of most known and(More)
A high-sensitivity, fully passive neurosensing system is presented for wireless brain signal monitoring. The proposed system is able to detect very low-power brain-like signals, viz. as low as -82 dBm (50 &#x03BC;Vpp) at fneuro &gt; 1 kHz. It is also able to read emulated neural signals as low as -70 dBm (200 &#x03BC;Vpp) at fneuro &gt; 100 Hz. This is an(More)
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