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- Andrew C. Guyette
- 2010 IEEE International Conference on Wireless…
- 2010

A new tunable bandstop resonator architecture has been presented which, for the first time, allows for both center frequency and bandwidth tuning using only tuning elements attached to the resonator. A 2nd-order microstrip prototype notch filter demonstrating the concept was successfully designed, built, and measured.

Normal realizations of bandstop resonators with finite unloaded Q suffer from degradation of performance due dissipation loss. In this paper it is shown theoretically that there exists a class of second-order networks which simultaneously exhibit an ideal bandstop resonance, with infinite stopband attenuation, and a perfect match at all frequencies.… (More)

- Andrew C. Guyette
- IEEE Transactions on Microwave Theory and…
- 2012

Intrinsically switched tunable filters are switched on and off using the tuning elements that tune their center frequencies and/or bandwidths, without requiring an increase in the tuning range of the tuning elements. Because external RF switches are not needed, substantial improvements in insertion loss, linearity, dc power consumption, control complexity,… (More)

- William J. Chappell, Eric J. Naglich, Christopher Maxey, Andrew C. Guyette
- Proceedings of the IEEE
- 2014

| The prospects for and the state of the art of adaptable RF hardware are reviewed, focusing primarily on the traditional frequency planning bottleneck, the filtering stages. First, a case is made that even banded systems can be greatly impacted by a modest amount of tuning. This is done by showing the results of a traditional fixed system in an unlicensed… (More)

- Andrew C. Guyette
- 2009 European Microwave Integrated Circuits…
- 2009

A unique design approach for narrowband tunable bandpass filters is presented which focuses on engineering the tuned center-frequency dependence of the coupling coefficient between adjacent resonators. New architectures are presented, and equations for the coupling coefficient are derived from energy expressions. A microstrip prototype with… (More)

- Frédéric Lécuyer, Robert R. Swisher, +9 authors John Cowles
- 2000

We present a 16-element hybrid grid amplifier. This is the first successful grid amplifier to use a reflection architecture, which should provide thermal performance superior to transmission grids. The grid uses custom-made differential-pair chips with TRW InP Heterojunction Bipolar Transistors (HBTs) as the active devices. We measure a peak gain of 15 dB… (More)

- Roberto Gómez-Garcia, Andrew C. Guyette
- IEEE Transactions on Microwave Theory and…
- 2015

An original and simple approach to the design of fully reconfigurable multi-band microwave bandpass filters (BPFs) with an arbitrary number of passbands is reported in this paper. It exploits the use of an innovative quasi-BPF configuration made up of different sets of controllable mono-frequency resonators to separately shape each tunable passband. Thus,… (More)

- Andrew C. Guyette
- IEEE Transactions on Microwave Theory and…
- 2013

This paper presents the theory, design, and implementation of a new class of component called an intrinsically switched multiplexer, which is comprised of a number of contiguous bandpass filter channels that can be independently switched on and off with very low architecture-related insertion loss and flat group delay across adjacent switched-on channels.… (More)

We report a simple theory for the reduction of substrate modes in quasi-optical power-combining arrays. This qualitative theory predicts that detrimental substrate-mode effects can be greatly reduced through a judicious choice of the array unit cell size. Experimental evidence from quasi-optical tripler grids is presented to confirm the theory. Measured… (More)

- Eric J. Naglich, Andrew C. Guyette
- IEEE Transactions on Microwave Theory and…
- 2015

This paper presents a technique that enables the design of high-order microwave bandstop filters with a total through-line length of significantly less than one quarter-wavelength at the filter center frequency. The total through-line length using this technique can be zero regardless of the filter order in theory, but it is limited in practice by the… (More)