Wide-band nulling system for antenna array based on a photonic microwave filter and optical delay lines

Mengual, T.; Martínez, B.; Vidal, B.; Martí, J.

doi:10.1016/j.optcom.2009.06.060

Cited by 3 publications

(5 citation statements)

References 16 publications

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“…This approach takes into account the setup nonidealities, in contrast to other works that used simulated radiation patterns based on measured scattering parameters [18,22,38]. The latter approach does not take into account several nonidealities, such as the effects of frequency dependence of the beam shape that do not directly depend on the beamformer (e.g., the mutual coupling between the elements, the change in the active reflection coefficient of the antenna with frequency, and the element beamwidth variations), as described in [37, Section 2.1.5].…”

Section: Antenna Pattern Measurementsmentioning

confidence: 99%

“…When realized optically, they can offer wideband, continuously tunable operation, and can be made independent of the operating RF frequency [13][14][15][16], allowing squint-free beamsteering and controllable nulls positioned on large percentage bandwidths [4,[16][17][18][19][20]. Multibeam capability can also be easily added to a beamformer, without dramatically increasing the network complexity, by using multiple optical wavelengths (as shown in [18,[21][22][23][24]). …”

Section: Introductionmentioning

confidence: 99%

“…For example, some applications show wideband operation but offer only discrete delay values [25][26][27][28], or other examples show that the beamformer can become relatively bulky when based on fibers or free-space optical components [7,8,18,23].…”

Section: Introductionmentioning

confidence: 99%

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System integration and radiation pattern measurements of a phased array antenna employing an integrated photonic beamformer for radio astronomy applications

et al. 2012

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In this paper we describe the system integration and the experimental demonstration of a photonically beamformed four-element receiving array antenna for radio astronomy applications. To our knowledge, the work described here is the first demonstration of the squint-free, continuously tunable beamsteering capability offered by an integrated photonic beamformer based on optical ring resonator true-time-delay units, with measured radiation patterns. The integrated beamformer is realized in a low loss, complementary metal-oxide-semiconductor (CMOS) compatible optical waveguide technology. The measurements show a wideband, continuous beamsteering operation over a steering angle of 23.5 degrees and an instantaneous bandwidth of 500 MHz limited only by the measurement setup.

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Section: Antenna Pattern Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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System integration and radiation pattern measurements of a phased array antenna employing an integrated photonic beamformer for radio astronomy applications

et al. 2012

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“…In addition to the basic operations of beamforming and beam steering, the optical implementation of additional functionalities, such as nulling [MAT99], [MEN09] and multibeam capability, as described in the previous section, has been also proposed. The implementation of these functions using photonic components is needed to maintain the advantages of the optical beamformer (i.e.…”

Section: Direction Of Arrival Estimation Of Broadband Signals In Phasmentioning

confidence: 99%

Photonic Vector Processing Techniques for Radiofrequency Signals

Ruipérez¹,

Ángel²

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The processing of radiofrequency signals using photonics means is a discipline that appeared almost at the same time as the laser and the optical fibre. Photonics offers the capability of managing broadband radiofrequency (RF) signals thanks to its low transmission attenuation, a variety of linear and non-linear phenomena and, recently, the potential to implement integrated photonic subsystems. These features open the door for the implementation of multiple functionalities including optical transportation, up and down frequency conversion, optical RF filtering, signal multiplexing, de-multiplexing, routing and switching, optical sampling, tone generation, delay control, beamforming and photonic generation of digital modulations, and even a combination of several of these functionalities. This thesis is focused on the application of vector processing in the optical domain to radiofrequency signals in two fields of application: optical beamforming, and photonic vector modulation and demodulation of digital quadrature amplitude modulations. The photonic vector control enables to adjust the amplitude and phase of the radiofrequency signals in the optical domain, which is the fundamental processing that is required in different applications such as beamforming networks for direct radiating array (DRA) antennas and multilevel quadrature modulation. DRAs consist of a set of individual antenna elements working simultaneously as an array antenna with an equivalent electrical size of a bigger single antenna. All the antenna elements radiate the same signal and, when all this signals interfere in the far-field, a constructive interference is achieved at a certain angular direction. Conventional implementations in the digital or microwave domain can show a high degree of complexity of the beamforming networks (i.e. the subsystem that performs the signal splitting and the phase and amplitude control) since it increases dramatically with the size of the antenna impacting in their size, mass, volume, v Abstract en explotar la dispersión cromática de la fibra óptica, la multiplexación por división de longitud de onda y la conversión en frecuencia. Además, se presenta una solución heterodina implementada monolíticamente en un circuito integrado fotónico (PIC).

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“…It is not possible to cover every optical beamforming method in this small section. Only the main approaches using dispersive and non-dispersive delays are discussed, since they have received more consideration and/or applications in recent reports [24][25][26][27][28][29][30]. To steer the main beam, the optical beamformer has to be able to vary the group delay.…”

Section: Dispersive and Non-dispersive Delay Optical Beamformersmentioning

confidence: 99%

Investigation on group delay ripple effects and the hybrid approach for optical beamforming

Trung¹

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Optical beamforming techniques can be subdivided into three categories in general [4]. The first approach is the optical implementation of time-integral correlation techniques, which is so difficult in practice that this approach have received considerably less effort. The second approach provides narrow-band phase-only control of a microwave signal at each element. The idea was to reduce size, weight and system complexity while immune to EMI. This idea is further improved in the last category, which includes the optical implementations of large instantaneous bandwidth with true time delay. The optical beamforming proposed in this project

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Wide-band nulling system for antenna array based on a photonic microwave filter and optical delay lines

Cited by 3 publications

References 16 publications

System integration and radiation pattern measurements of a phased array antenna employing an integrated photonic beamformer for radio astronomy applications

System integration and radiation pattern measurements of a phased array antenna employing an integrated photonic beamformer for radio astronomy applications

Photonic Vector Processing Techniques for Radiofrequency Signals

Investigation on group delay ripple effects and the hybrid approach for optical beamforming

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