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We demonstrate evanescently-coupled waveguide modified uni-traveling-carrier (MUTC) photodiodes with more than 105 GHz bandwidth. The photodiodes have dark currents as low as nA and deliver RF output powers of 5.1 dBm, 4.4 dBm and 3.5 dBm at 75 GHz, 80 GHz and 90GHz, respectively.
Some experimental study is conducted to validate the Time-Reversal imaging of extended targets in weak cluttered background and to examine some factors that influence the imaging quality.
The solid-state power-combining amplifier is a key for modern communication and radar system. In this paper, a new high isolation power divider/combiner circuit based on improved magic-tee circuit is put forward to investigate. The simulated and tested results show that it can achieve very good performance of high isolation. With using this new power divider/combiner circuit, a 29~31GHz band continuous-wave...
Wireless spread spectrum technologies are widely used in the implementation of WLAN physical layer. Bits error rate (BER) and bandwidth efficiency are the two most important aspects we concern. In this paper, we propose a high efficiency spread spectrum modulation technology based on the definition of non-strictly orthogonal sequences (NS-OS). Simulation shows that the proposed scheme has a better...
A fully differential architecture from the antenna to the integrated circuit is proposed for radio transceivers in this paper. The physical implementation of the architecture into truly single-chip radio transceivers is described for the first time. Two key building blocks, the differential antenna and the differential transmit-receive (T-R) switch, were designed, fabricated, and tested. The differential...
We investigate the transmission spectra in a single-mode fiber excited by two acoustic waves with orthogonal perturbations using a novel composite piezoelectric transducer. Polarization-dependent spectra are observed due to coherent acousto-optic coupling between core-to-cladding modes.
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