Modern microwave and millimeter wave phased array antennas are attractive because of their ability to steer wave beams in space without physically moving the antenna element. A typical phased array antenna may have several thousand elements fed by a phase shifter for every antenna, which can steer the resulting array beam to different directions. Their low loss, low cost and lightweight phase s...

( ) ABSTRACT: Artificial neural networks ANN recently gained attention as a fast and flexible vehicle to microwave modeling and design. Fast neural models trained from measured simulated microwave data can be used during microwave design to provide instant answers to the task they have learned. We review two important aspects of neural-network-based microwave modeling, namely, model development...

Photonic integration, advanced functionality, reconfigurability, and high radio frequency (RF) performance are key features in integrated microwave photonic systems that still difficult to achieve simultaneously. In this work, we demonstrate an circuit can be reconfigured for two distinct RF functions, namely, a tunable notch filter phase shifter. We achieved >50 dB high-extinction filte...

This paper discusses the use of high integration processes and their applications for telecommunications at microwaves. As a comparison imple-mentation techniques are detailed both in GaAs and Si technologies for active LC filters. A comparison in terms of size and cost is also made with the design of integrated negative resistance circuits.

In this paper a MMIC design technique, oriented to the optimization of the production yields, is illustrated together with the obtained results. This method, based on a sensitivity analysis, i.e. on the circuit behavior for variations of passive elements from their nominal value, and on the contemporary determination of the production yields, allows the identification the circuit elements to ob...

and Introduction: This project focused on the preparation of high electron mobility transistors (HEMTs) and the design of a HEMTbased, single-lithography-layer oscillator with active integrated antenna circuit with target oscillation frequencies up to 100 GHz. HEMT devices are well known for their suitability in high frequency microwave circuits, possibly for two reasons. Firstly, HEMTs offer h...

Accurate modeling of nonlinear microwave devices is critical for reliable design of microwave circuit and system. In this paper, a more general neuro-space mapping (Neuro-SM) method is proposed to fulfill the needs of the increased modeling complexity. The proposed technique retains the capability of the existing dynamic Neuro-SM in modifying the dynamic voltage relationship between the coarse ...

Differential signaling in analog circuits is an old technique that has been utilized for more than 50 years. During the last decades, it has also been becoming popular in digital circuit design, when low voltage differential signaling (LVDS) became common in high-speed digital systems. Today LVDS is widely used in advanced electronics such as laptop computers, test and measurement instrument, m...

Title of Dissertation: INVESTIGATION OF RELIABILITY IN GALLIUM NITRIDE HIGH ELECTRON MOBILITY TRANSISTORS USING EQUIVALENT CIRCUIT MODELS FOR USE IN HIGH POWER, HIGH FREQUENCY MICROWAVE AMPLIFIERS Benjamin D. Huebschman, Doctor of Philosophy, 2010 Dissertation Directed By: Professor Neil Goldsman Department of Electrical and Computer Engineering Gallium Nitride (GaN) is beginning to emerge as a...