Microwave reflection amplifier for detection and tagging applications

Cantú, H.I.; Fusco, Vincent; Simms, S.

doi:10.1049/iet-map:20070122

Cited by 16 publications

(10 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To be stable, such a network should always be terminated to a resistance greater than the input resistance of the reflection amplifier with a sufficient margin. The reported reflection amplifiers are usually narrowband and generate a large positive group delay [42], [47], [48] with a recent report of a 40% bandwidth at -band [49].…”

Section: A Suitable Active Circuit Blocks For Loss Compensationmentioning

confidence: 99%

Realizing Non-Foster Reactive Elements Using Negative-Group-Delay Networks

Mirzaei

Eleftheriades

2013

IEEE Trans. Microwave Theory Techn.

113

View full text Add to dashboard Cite

An intimate relation is established between non-Foster reactive elements and loss-compensated negative-group-delay (NGD) networks. It is shown that any possible network configuration containing a class of non-Foster elements operates as an NGD network. Likewise, it is demonstrated that a loss-compensated NGD network represents a reactive network with a non-Foster behavior. Consequently, these two properties can be intimately linked together and NGD networks can be utilized to implement non-Foster elements, such as negative capacitors and inductors. This result introduces another perspective in realizing non-Foster reactive elements, leading to new designs that are well behaved and more predictable in terms of stability and operation than traditional designs using negative impedance inverters and negative impedance converters. Based on this concept, loss-compensated NGD networks are proposed for realizing high-quality non-Foster reactive elements. Furthermore, entirely passive non-Foster elements with a limited quality ( ) factor are proposed for which the minimum factor and the maximum achievable bandwidth are inversely related. It is shown that the design of non-Foster reactive elements using NGD networks can lead to the realization of standalone unilateral non-Foster reactive elements in a certain bandwidth. Examples of such non-Foster reactive elements and networks are demonstrated experimentally and shown to be stable.Index Terms-Dispersion engineering, negative group delay (NGD), negative group velocity (NGV), non-Foster reactances.

show abstract

Section: A Suitable Active Circuit Blocks For Loss Compensationmentioning

confidence: 99%

Realizing Non-Foster Reactive Elements Using Negative-Group-Delay Networks

Mirzaei

Eleftheriades

2013

IEEE Trans. Microwave Theory Techn.

113

View full text Add to dashboard Cite

show abstract

“…3, a differential active reflector core is interfaced directly to a dipole antenna. In contrast to the single-ended active reflector in [9], the cross-coupled structure [13] is adopted as was originally presented in [2], [7] to reduce common mode noise and allows a match to a wide range of antenna admittances. This is critical in our design procedure because the power consumption can be reduced significantly with an appropriate load admittance selection.…”

Section: Active Scatterermentioning

confidence: 99%

“…Although active reflectors have been previously studied [8], [9], this work reports for the first time the measured reradiation gain of this type of device in a controlled wireless environment. Also, a matching network design between the antenna and the active reflector will be presented to minimize connection loss and to maintain the amplifier stability.…”

Section: Introductionmentioning

confidence: 99%

A 4-GHz Active Scatterer in 130-nm CMOS for Phase Sweep Amplify-and-Forward

Bousquet

Magierowski

Messier

2012

IEEE Trans. Circuits Syst. I

View full text Add to dashboard Cite

This article demonstrates the cooperative diversity improvement achieved using a 120-W active scatterer built in 130-nm CMOS technology. The low-power all-analog device acts as a repeater, or relay, for phase sweep amplify-and-forward cooperative transmission. The device relies on microwave reflection to amplify, dynamically phase modulate, and reradiate the incident signal. This reduces the duration of the fades experienced in the indoor radio channel and improves error correction code performance. Radio channel propagation measurements collected using the relay prototype clearly show the effect of the phase modulation on fading and system level simulations conducted using the propagation data show a fivefold increase in coverage area.

show abstract

“…Reflection amplifiers when operated in the linear mode have been shown to be useful for tagging and detection applications [3]. In the present investigation we attempt to exploit, for the first time, the nonlinear region of reflection amplifier operation in order to generate the phase conjugated signal required for retrodirective action without the need for additional mixers.…”

mentioning

confidence: 99%

“…The linear operation of the amplifier was discussed in detail in [3]. The schematic diagram and photomicrograph of the reflection amplifier are shown in Fig.…”

mentioning

confidence: 99%