November 09, 2017

Electrochromic Thin Films WO3-LiNbO3-NiO Broadband Microwave Characterization at Various Temperatures

  • Bulja S.
  • Cahill R.
  • Kopf R.
  • Norooziarab M.

This paper describes, for the first time, dielectric characterization of an electronically tunable electrochromic (EC) thin film material using a temperature- controlled microstrip line method between 7C to 50C in a broad frequency band of 1-67 GHz. The two ends of the microstrip line, directly exposed to the tunable EC material, are connected to two broadband CPW to microstrip line transitions. The transitions allow the application of a dc bias voltage for electric stimulation of the material and facilitate on-wafer RF measurements using a standard CPW probe station. In addition, SiO2 is used as a known material to evaluate dielectric extraction algorithm and to establish an understanding of wave propagation mechanism in thin film microstrip lines (TFMLs). This information can help the designer to properly exploit the potentials of the newly introduced tunable material. Finally, the experimental results suggest a broader operating temperature range for this first generation of tunable EC material compared to some liquid crystals such as K15

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Recent Publications

August 09, 2017

A Cloud Native Approach to 5G Network Slicing

  • Francini A.
  • Miller R.
  • Sharma S.

5G networks will have to support a set of very diverse and often extreme requirements. Network slicing offers an effective way to unlock the full potential of 5G networks and meet those requirements on a shared network infrastructure. This paper presents a cloud native approach to network slicing. The cloud ...

August 01, 2017

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
  • Wang H.
  • Wu Q.

Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

July 12, 2017

PrivApprox: Privacy-Preserving Stream Analytics

  • Chen R.
  • Christof Fetzer
  • Le D.
  • Martin Beck
  • Pramod Bhatotia
  • Thorsten Strufe

How to preserve users' privacy while supporting high-utility analytics for low-latency stream processing? To answer this question: we describe the design, implementation and evaluation of PRIVAPPROX, a data analytics system for privacy-preserving stream processing. PRIVAPPROX provides three properties: (i) Privacy: zero-knowledge privacy (ezk) guarantees for users, a privacy bound tighter ...