At the Women in Microwave (WiM) event, we will put the spotlight on distinguished women in microwaves, who advanced the field of Microwaves Theory and Techniques and the field of Automatic Radio Frequency Techniques considerably.
Distinguished women in microwaves will give a review talk of the specific research topic they are working in and advancing. From today's view, the following distinguished women in microwaves will present their research:
- , and
The WiM event at IEEE RWW 2021 will be sponsored by the Microwave Theory and Techniques Society (MTT-S) and the Automatic Radio Frequency Techniques Group (ARFTG).
High-Efficiency Amplifiers for Broadband High-PAR Signals
Speaker: Prof. Zoya Popovic, University of Colorado
Achieving power amplifiers (PAs) with high efficiency and good linearity is challenging if the amplified signals have wide instantaneous bandwidths (>100MHz) and high peak-to-average power ratios (PAPR > 10dB). Examples of such signals include multi-carrier concurrent signals, both closely and widely spaced, and band-limited noise-like signals, typical of 5G and other multi-carrier aggregated signal applications. This talk will overview techniques for supply modulation of broadband signals amplified by different GaN PAs, including a 2-4GHz single ended hybrid PA, an X-band MMIC PA, and a K-band MMIC PA. The signals that are considered include band-limited noise with bandwidths from 10 to 250MHz, and widely spaced multi-carrier with up to 800MHz spacing. Both continuous and discrete supply modulation of multiple amplifier stages is demonstrated, and linearization methods discussed. Specifically, an analog technique for improving power amplifier (PA) linearity for high instantaneous bandwidth signals using gate bias modulation will be presented.
Energy-Autonomous Localization and Tracking
Speaker: Prof. Alessandra Costanzo, University of Bologna
Low-power localization and tracking are crucial features of the Internet of Things (IoT) paradigm that is becoming essential for industrial and civilian applications. This is made possible because of ultra-low power communication technologies and of efficient wireless powering of battery-less nodes. In this talk recent RF systems implementing passive localization with centimeter-level accuracy and using UWB pulses are presented. Demonstration of their potential adoption for tracking objects in harsh EM environments such as industrial plants or inside the space station is discussed.
Metrology for Over-the-Air Tests: Extending the Traceability Path
Speaker: Dr. Kate Remley, National Institute of Standards and Technology
The use of over-the-air (OTA) test is a necessity for characterizing mobile microwave and millimeter-wave wireless devices with antennas that are integrated into transmitters and receivers. I will discuss recent activities in OTA metrology in CTL and complexities related to extending the traceability path for measurements of devices with integrated antennas. This includes the characterization of reference waveforms and environments, methods to assess linear and nonlinear distortion and applications to testing internet-of-things devices in advanced communication systems.
Emerging Developments on Integrated SWIPT Receivers
Speaker: Prof. Dominique Schreurs, KU Leuven
Despite mainstream simultaneous wireless information and power transfer (SWIPT) research focuses on time and power split receivers in the IoT nodes, so called integrated receivers allow for maximally reusing the energy harvesting hardware for information reception. In this talk, we discuss the impact of the choice of the incoming signal's modulation technique on both power conversion efficiency and data rate. The concepts are first explained by means of a tailored behavioral model description of the SWIPT receiver, and are next demonstrated by experimental results.