&lt;title&gt;True-time-delay beamforming using fiber optic cavities&lt;/title&gt;

Gesell, Leslie H.; Turpin, Terry M.; Rubin, Michele W.

doi:10.1117/12.218517

Cited by 4 publications

(2 citation statements)

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“…Wide aperture arrays for transmitting and receiving wide band signals suffer beam broadening when steered away from the array normal using phase delays between the array elements. This beam dispersion is eliminated if time delays instead of phase shifts are used between antenna array elements [5–8].…”

Section: Introductionmentioning

confidence: 99%

A true-time-delay networks design technique

Leggieri

Passi

Paolo

2014

Int. J. Microw. Wireless Technol.

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A true-time-delay networks design technique alberto leggieri, davide passi and franco di paolo This paper proposes a technique to design wide band switched-line (SL) true-time-delay (TTD) networks, commonly used for phased array antenna (PAA) applications. This study investigates the constant-delay behavior of switched-line phase shifters based on single-pole double-throw (SPDT) switches. Circuit sizing starts by considering the effective S-parameters of the switches, to use their non-idealities as an integral part of the phase shift linearly dependent to the frequency and by considering, from the beginning, the possible spatial positioning of elements that allows the circuit feasibility as a design target. The aim of this study is to provide a technique suitable for the design of well-matched TTD networks with a flat delay in wide bandwidth. In this paper, we propose new design formulas for which we show a single-frequency implementation. A computational strategy is used to obtain numerical solutions of the derived equations with this study. Finally, a monolithic X-band TTD circuit example is shown.

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Section: Introductionmentioning

confidence: 99%

A true-time-delay networks design technique

Leggieri

Passi

Paolo

2014

Int. J. Microw. Wireless Technol.

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“…This concept uses an array of fibers, or other optical waveguides, containing cavities having different resonate frequencies to channelize the signal which is to be delayed. 8 Each spectral component of the signal is phase shifted by an amount proportional to the frequency of that spectral component and proportional to the time delay desired. These phase shifted spectral components are then summed to obtain the delayed signal.…”

Section: Introductionmentioning

confidence: 99%

Optical resonators for true-time-delay beam steering

Gesell¹,

Evanko²

1996

SPIE Proceedings

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Conventional true time delay beaniforming and steering devices rely on switching between various lengths of delay line. Therefore only discrete delays are possible. Proposed is a new photonics concept for true time delay beamforming which provides a finely controlled continuum of delays with switching speeds on the order of 10's of nanoseconds or faster. The architecture uses an array of waveguide cavities with different resonate frequencies to channelize the signal. Each spectral component ofthe signal is phase shifted by an amount proportional to the frequency of that component and the desired time delay. These phase shifted spectral components are then summed to obtain the delayed signal. This paper provides an overview ofthe results of a Phase I SBIR contract where this concept has been refined and analyzed. The parameters for an operational system are determined and indication of the feasibility of this approach is given. Among the issues addressed are the requirements of the resonators and the methods necessary to implement fiber optic Bragg gratings as these resonators.

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Optical True-Time Delay Control Systems for Wideband Phased Array Antennas

Chen

2000

Progress in Optics

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<title>True-time-delay beamforming using fiber optic cavities</title>

Cited by 4 publications

References 2 publications

A true-time-delay networks design technique

A true-time-delay networks design technique

Optical resonators for true-time-delay beam steering

Optical True-Time Delay Control Systems for Wideband Phased Array Antennas

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