A multioctave-band photonically-controlled, low-profile, structurally-embedded phased array with integrated frequency-independent phase-shifter

Synthesis of frequency-independent phase shifters using negative group delay active circuit

“…In that case, comparative nonlinear and noise studies following the different positions available for the resonant networks should be planned to identify the topologies respectively dedicated to receiver or emitter in RF front-end. The design of a reconfigurable NGD PS is also scheduled; indeed, such a device could be particularly attractive for applications in mobile satellite broadcasting systems, e.g., active phasedarray antenna as introduced in [24,25], or in IQ modulator/demodulator for use in digital communication systems [22], or to ensure particular functions such as frequency convertor, balun [17], PLL. In that way, tunable active inductances [29] are a particularly interesting idea and may also bring solutions to overcome lumped-inductor frequency limitations.…”

“…But, this approach is useful only in relative band narrower than 10% [23]. So, to overcome this limitation, PSs were proposed by Wang in [24,25]: their specificities are the use of photovoltaic FET switches controlled by optical fibers and the production of frequency-independent performances, but their implementation in hybrid technology is complex. It is worth recalling that a broadband PS is among the key components within phased-array antennas, radar, and satellite broadcasting/communication systems.…”

Traveling-Wave Antenna (TWA) array as a thin Multioctave Planar Phased Array (MPPA)

“…The next step was to design and layout a physical array that has a feed network and use real-world hardware. Specifically, the layout of the bowtie subelements and the capacitive coupling between bowtie elements benefitted from the techniques partially disclosed in [23]- [26]. The multioctave balun feed was based on a proprietary technology developed at WEO over many years for TWAs [28].…”

Study and Application of Microwave Active Circuits with Negative Group Delay

“…For example, PC was investigated in ultra-fast laser systems (Li et al, 2005), then its use has become more and more common thanks to the development of chirped pulse amplification (Arbore, 1997;. The next step was the compression of a pulse in a Mach-Zehnder-interferometer geometry achieved by passing a broadband ultra-short pulse through two chirped fibre Bragg gratings with different chirp rates (Zeitouny et al, 2005). In radar and communication systems, PC has been used to enhance the range resolution.…”