In electrical engineering, a circulator is a passive, non-reciprocal three- or four-port device that only allows a microwave or radio-frequency signal to exit through the port directly after the one it entered. Optical circulators have similar behavior. Ports are where an external waveguide or transmission line, such as a microstrip line or a coaxial cable, connects to the device. For a three-port circulator, a signal applied to port 1 only comes out of port 2; a signal applied to port 2 only comes out of port 3; a signal applied to port 3 only comes out of port 1, and so on. An ideal three-port circulator has the following scattering matrix:
Microstrip is a type of electrical transmission line which can be fabricated with any technology where a conductor is separated from a ground plane by a dielectric layer known as "substrate". Microstrip lines are used to convey microwave-frequency signals.
A dielectric resonator is a piece of dielectric material, usually ceramic, that is designed to function as a resonator for radio waves, generally in the microwave and millimeter wave bands. The microwaves are confined inside the resonator material by the abrupt change in permittivity at the surface, and bounce back and forth between the sides. At certain frequencies, the resonant frequencies, the microwaves form standing waves in the resonator, oscillating with large amplitudes. Dielectric resonators generally consist of a "puck" of ceramic that has a large dielectric constant and a low dissipation factor. The resonant frequency is determined by the overall physical dimensions of the resonator and the dielectric constant of the material.
The spurline is a type of radio-frequency and microwave distributed element filter with band-stop (notch) characteristics, most commonly used with microstrip transmission lines. Spurlines usually exhibit moderate to narrow-band rejection, at about 10% around the central frequency.
Wilmer Lanier Barrow was an American electrical engineer, inventor, teacher, industrial manager, and a counselor to government agencies. He obtained a BSEE degree in 1926 from Louisiana State University, and a doctorate from the Technical University of Munich in 1931. During the pre-World War 2 development of radar at Massachusetts Institute of Technology, Barrow performed research on microwaves, inventing waveguide in 1936 and the horn antenna in 1938.
Sir Christopher Maxwell Snowden, is a British electronic engineer and academic. He was the former Vice-Chancellor of Surrey University (2005–2015) and of the University of Southampton (2015–2019). He was president of Universities UK for a two-year term until 31 July 2015 and is currently chairman of the ERA Foundation.
The IEEE MTT-S International Microwave Symposium (IMS) is an annual technical professional conference specializing in RF/Microwave theory and applications that is a combination of multiple technical conferences and a commercial exhibition. The IMS is the largest gathering of RF/Microwave professionals in the world and is organized and sponsored by the IEEE Microwave Theory and Techniques Society (MTT-S).
Linda Pisti Basile Katehi-Tseregounis is a Greek-born American engineering professor and former university administrator. Katehi was elected a member of the National Academy of Engineering (2006) for contributions to three-dimensional integrated circuits and on-wafer packaging and to engineering education. Katehi worked as the University of Illinois Urbana-Champaign's provost from 2006 to 2009 and dean of engineering at Purdue University from 2002 to 2006. Beginning in 2009, she served as the sixth chancellor of the University of California, Davis.
A distributed-element filter is an electronic filter in which capacitance, inductance, and resistance are not localised in discrete capacitors, inductors, and resistors as they are in conventional filters. Its purpose is to allow a range of signal frequencies to pass, but to block others. Conventional filters are constructed from inductors and capacitors, and the circuits so built are described by the lumped element model, which considers each element to be "lumped together" at one place. That model is conceptually simple, but it becomes increasingly unreliable as the frequency of the signal increases, or equivalently as the wavelength decreases. The distributed-element model applies at all frequencies, and is used in transmission-line theory; many distributed-element components are made of short lengths of transmission line. In the distributed view of circuits, the elements are distributed along the length of conductors and are inextricably mixed together. The filter design is usually concerned only with inductance and capacitance, but because of this mixing of elements they cannot be treated as separate "lumped" capacitors and inductors. There is no precise frequency above which distributed element filters must be used but they are especially associated with the microwave band.
The history of metamaterials begins with artificial dielectrics in microwave engineering as it developed just after World War II. Yet, there are seminal explorations of artificial materials for manipulating electromagnetic waves at the end of the 19th century. Hence, the history of metamaterials is essentially a history of developing certain types of manufactured materials, which interact at radio frequency, microwave, and later optical frequencies.
IEEE Microwave and Wireless Components Letters is a monthly peer-reviewed scientific journal published by the IEEE Microwave Theory and Techniques Society. The editor-in-chief is Roberto Gómez García. The journal covers research on electromagnetic radiation and the relevant, physical components to achieve such radiations. It focuses on devices, intermediate parts of systems, and completed systems of the interested wavelengths, but also includes papers which emphasize theory, experiment, and applications of the subjects covered.
IEEE Microwave Magazine is a professional magazine for the members of IEEE Microwave Theory and Techniques Society that is published monthly with several special conference issues. It is also available to others as a part of the IEEE Xplore. In addition to providing societal communications to the MTT-S membership, it has regular columns giving insight into a range of technical and non-technical interests and the publication of technical feature-length articles that provide overviews and tutorials on the state-of-the-art in a given area. Currently, a typical print run is approximately 15,000 issues.
Microwave engineering pertains to the study and design of microwave circuits, components, and systems. Fundamental principles are applied to analysis, design and measurement techniques in this field. The short wavelengths involved distinguish this discipline from electronic engineering. This is because there are different interactions with circuits, transmissions and propagation characteristics at microwave frequencies.
IEEE Transactions on Electron Devices (T-ED) is a monthly peer-reviewed scientific journal publishes original and significant contributions relating to the theory, modeling, design, performance and reliability of electron and ion integrated circuit devices and interconnects, involving insulators, metals, organic materials, micro-plasmas, semiconductors, quantum-effect structures, vacuum devices, and emerging materials with applications in bioelectronics, biomedical electronics, computation, communications, displays, microelectromechanics, imaging, micro-actuators, nanoelectronics, optoelectronics, photovoltaics, power ICs and micro-sensors. Tutorial and review papers on these subjects are also published and occasional special issues appear to present a collection of papers which treat particular areas in more depth and breadth.
Nuno Miguel Gonçalves Borges de Carvalho from the Universidade de Aveiro, Aveiro, Portugal was named Fellow of the Institute of Electrical and Electronics Engineers (IEEE) in 2015 for contributions on characterization and design of nonlinear RF circuits.
Natalino Camilleri from the Nitero, Inc., Austin, TX was named Fellow of the Institute of Electrical and Electronics Engineers (IEEE) in 2015 for leadership in radio frequency integrated circuits and systems.
Stepan Lucyszyn FIEEE is a British engineer, inventor and technologist, and has been a Professor of Millimetre-wave Systems at Imperial College London, England, since 2016. He was named a Fellow of the Institute of Electrical and Electronics Engineers (IEEE) in 2014. Lucyszyn's research has mainly focused on monolithic microwave integrated circuits (MMICs), radio frequency microelectromechnical systems, wireless power transfer (WPT), thermal infrared technologies and additive manufacturing.
IEEE Transactions on Circuits and Systems I: Regular Papers is a monthly peer-reviewed scientific journal covering the theory, analysis, design, and practical implementations of electrical and electronic circuits, and the application of circuit techniques to systems and to signal processing. It is published by the IEEE Circuits and Systems Society. The journal was established in 1952 and the editor-in-chief is Weisheng Zhao.
Arthur Aaron Oliner was an American physicist and electrical engineer, who was professor emeritus at department of electrical and computer engineering at New York University-Polytechnic. Best known for his contributions to engineering electromagnetics and antenna theory, he is regarded as a pioneer of leaky wave theory and leaky wave antennas.
