5 bit photonic time shifter for wideband arrays

Loo, Ronald K.; Tangonan, Gregory L.; Yen, H.C.; Lee, J.J.; Jones, V. L.; Lewis, Jack B.

doi:10.1049/el:19951098

Cited by 8 publications

(5 citation statements)

References 2 publications

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“…Possible future work for this proposed system includes the hardware implementation and testing over-the-air. Various mature technologies, for example, microwave, photonic, and acousto-optic, can be implemented to realize the switchable delay lines at the RF tag for transmitting different messages, as described in [50][51][52][53][54]. Compact wideband antennas suitable for RFID tags are discussed in many recent papers.…”

Section: Discussionmentioning

confidence: 99%

Delay-Modulated RF Tag System Concept Using Ultrawideband Noise Radar Waveforms

Pan

Narayanan

2011

International Journal of Distributed Sensor Networks

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Radio frequency (RF) tags have been widely used in inventory tracking, environmental monitoring, battlefield situational awareness, and combat identification due to their low cost, small size, and wireless functionality. This paper explores the application of active RF tags in outdoor environments responding to random noise radar interrogations with predetermined messages. A conceptual system design for communication between radar and RF tags using ultrawideband (UWB) noise waveforms is proposed and analyzed theoretically and via simulations. The tag structure comprises a sensing receiver and active receiver/transmitter. The sensing receiver senses the radar header consisting of a prearranged secret realization of the noise waveform. The active receiver/transmitter modulates the RF tag's message onto the radar interrogation signal through weighted tapped delays and reradiates the tag message back to the radar. System performance is evaluated in terms of symbol error probability in an additive white Gaussian noise (AWGN) channel. A technique to combat multipath interference is presented. It is shown that this system is capable of communicating a suite of messages from the tags to the radar.

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Section: Discussionmentioning

confidence: 99%

Delay-Modulated RF Tag System Concept Using Ultrawideband Noise Radar Waveforms

Pan

Narayanan

2011

International Journal of Distributed Sensor Networks

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“…These circuits may exhibit insertion losses as high as 20 dB and amplitude imbalances of Ϯ2 dB [1][2][3][4]. Amplitude compensation may be achieved by methods of (1) providing additional attenuation and/or gain elements, (2) dielectric tuning, or (3) use of negative dielectric circuits to obtain negative group delays.…”

Section: Introductionmentioning

confidence: 99%

“…Broad bandwidth or bandwidth enhancement of a PIFA can be achieved by several efficient approaches, namely using multiadjacent RF by additional resonant element, loading dielectric with high permittivity, attaching chip resistor that is increasing loss term, etc. [4]. All these need an additional element or slit.…”

Section: Introductionmentioning

confidence: 99%

Design and development of a broadband amplitude compensated long time delay circuit on thin‐film liquid crystal polymer

Chen

Zhang

Pham

et al. 2009

Micro & Optical Tech Letters

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and the effect of the finite ground which has not been included in the simulation procedure. The passband insertion loss is about 2.4 dB, which is mainly due to the conductor and dielectric losses of the substrate. The 3-dB bandwidth is 5.3%. Two transmission zeros at 0.97 GHz and 1.04 GHz are observed as expected. The out-of-band rejection is better than 31.5 dB at the lower stopband and 29 dB at the upper stopband. CONCLUSIONIn this article, a novel compact slow-wave open-loop resonator has been presented to build up fourth-order cross-coupled microstrip bandpass filter. Both theory and experiments are provided. The results demonstrate that the filter size can be extremely reduced by using the proposed resonator. The measured results are in good agreement with simulated predictions. In fact, besides the filter mentioned above, the compact slow-wave resonators can also allow various filter topologies to be realized. Using the proposed approach, it is possible to achieve a very compact arrangement and reduce the space needed for the integration of the filters in future wireless communication systems. ACKNOWLEDGMENTSThis present work was supported by Science and Technology Foundation for Youth of University of Electronic Science and Technology of China, JX0620. DESIGN AND DEVELOPMENT OF

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“…Phased array antennas require equal amplitude to provide controlled beam steering. Typical comparable circuits show up to 40 dB insertion loss, ±0.5 dB to ±2 dB amplitude imbalance, and 3 dB to 20 dB return loss [1][2][3][4]. LTDs generally suffer from 1) high insertion losses and 2) amplitude imbalance across different states.…”

Section: Introductionmentioning

confidence: 99%

Thin-film LCP amplitude compensated long time delay circuit

Chen

Zhang

Pham

et al. 2008

2008 IEEE MTT-S International Microwave Symposium Digest

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We present the design and development of an amplitude compensated long time delay circuit (LTD) in multilayer liquid crystal polymer (LCP) films. The design is implemented with MEMS switches. An LTD is built on a thin-film multilayer stack to provide a variety of transmission lines to offer different attenuation characteristics for amplitude compensation. True time delay (TTD) components produce 0 ps, 200 ps, 400 ps, and 600 ps relative delays. This part is intended to work over wide frequency ranges from DC to 10 GHz. Insertion loss mismatch between delays is measured to be less than ±0.4 dB across the band.Index Terms -Delay-lines, flexible structures, packaging, and phase shifter.

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5 bit photonic time shifter for wideband arrays

Cited by 8 publications

References 2 publications

Delay-Modulated RF Tag System Concept Using Ultrawideband Noise Radar Waveforms

Delay-Modulated RF Tag System Concept Using Ultrawideband Noise Radar Waveforms

Design and development of a broadband amplitude compensated long time delay circuit on thin‐film liquid crystal polymer

Thin-film LCP amplitude compensated long time delay circuit

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