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Quantum communication is important for information-theoretic secure key distribution through public channels as well as for beating standard limits to information transfer in finite-bandwidth channels and for performing distributed quantum computation. Practical and theoretical quantum communication is advancing rapidly but key challenges remain. I present the current state of the field and some promising...
Microwave filter is a compulsory sub-system in all the communication systems. Its electric properties and characteristics decisively determine the overall performance of a communication satellite and a wireless communication network. To meet the high demand on more stringent frequency selections, faster manufacturing turnaround time, more compact size and, above all, a better understanding of the...
In this paper, a improved guided wave structure called image transition used in the design of half mode substrate integrated waveguide (HMSIW) power splitter is proposed. The design principle is introduced and three types of HMSIW T-junction are designed and measured with further application in the design of power splitter.
An injection-locked push-push oscillator is developed for millimeter-wave signal source. A V-band push-push CMOS voltage controlled oscillator (VCO) is proposed in this study. A new core complementary Colpitts structure was adopted in a 90 nm CMOS process of FET induced capacitance of LC tank. The measured phase noise at 1 MHz offset is at 59 GHz. The power consumption of the VCO core is only 28.8...
Based on stepped-impedance resonators (SIRs), a trisection filter is proposed to create a pair of real or imaginary zeros. Such zeros are useful to implement quasi-elliptic or flat group-delay response. Y-parameters are formulated for deriving the equivalent circuit. It is found that the sign of Y13 above and below the center frequency can be opposite, leading to a pair of zeros. Two more zeros are...
In this invited talk, the millimetre-wave (mmW) antenna arrays which are fully integrated into low-temperature co-fired ceramic (LTCC) with substrate integrated concept are reviewed. We start with addressing the important challenges in designing mmW antennas such as losses, fabrication, and measurement. After that, three typical designs are introduced as examples. A 60-GHz antenna array with greatly...
The recent researches on transversal signal-interaction concept for ultra-wideband (UWB) filter circuits in Nanjing University of Science and Technology are introduced in this paper. Transversal signal-interaction concept and its newly proposed variations have been finding more and more application in microwave ultra-wideband filter circuits. Two examples of filter circuits based on transversal signal-interaction...
Inspired by conventional lens antennas, the flat transmitarray has been proposed in the last decades, combining with the concept of phased arrays, to carry forward the large aperture antennas for high-gain applications with advantages of low profile, easy fabrication, low cost, and wide scanning angles, etc. The air feed scheme of the transmitarray contributes to the result that a lower loss can be...
As the demand of broadband and high speed communication increases, high performance sub-harmonic mixer solution becomes more and more important for millimeter-wave frequency applications. Low Conversion Loss (CL), high LO to RF/IF isolation, low spurs leakage and high linearity are desired features that are challenging to reach at the same time in SHM designs. This paper briefly reviews three designs...
Due to the high bandwidth utilization efficiency, multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) techniques have become a major trend for modern communications. However, MIMO-OFDM techniques need precise synchronization and channel estimation methods to compensate the frequency offset and utilize the multiple antenna diversity. In our previous research, we have...
We study a two-transmitter two-receiver network where Receiver 1 can only hear the transmitted signal of Transmitter 1. Transmitter 1 has two messages, one of which is intended for Receiver 1 while both are intended for Receiver 2. Transmitter 2 has one message which is intended for Receiver 2. We call this channel model the Z channel with degraded message sets. When the multiple access link between...
In this paper, we address the problem of choosing the right topology for a wireless power transfer (WPT) application to obtain maximum power transfer efficiency. We analyze the series and parallel resonant topologies used in inductively coupled links, derive the efficiency expressions and verify them experimentally using planar inductors built on a PCB. We compare and contrast the two topologies and...
We study THz transmission through two kinds of periodic structures, metamaterial and the array of subwavelength periodic holes, made from the superconducting (SC) NbN thin films. Due to the low loss of superconducting films, we got very high unloaded quality factor of THz metmaterial at 8 K. A large tuning range is displayed when the temperature is just below the superconducting transition temperature...
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