Theoretical and Experimental Study of Interference in Multibeam Active Phased Array Transmit Antenna for Satellite Communications

Maalouf, K.J.; Lier, E.

doi:10.1109/tap.2004.823900

Cited by 33 publications

(17 citation statements)

References 11 publications

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“…The transmission impairment mechanisms associated with such systems are subsequently addressed. Other and similar characterizations of the transmission mechanisms, interference parameters and bit error analyses were reported (Maalouf et al, 1998), (Purdy & Lier, 2000), (Lier & Maalouf, 2003), (Maalouf & Lier, 2004). Of special interest is the analysis of intermodulation components that result from multicarrier operation of active phased arrays (Sandrin, 1973), (Lier & Charrette, 2005).…”

Section: Introductionmentioning

confidence: 77%

System Aspects of Active Phased Arrays

Zaghloul¹,

Kıłıc²,

C.³

2010

Satellite Communications

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Section: Introductionmentioning

confidence: 77%

System Aspects of Active Phased Arrays

Zaghloul¹,

Kıłıc²,

C.³

2010

Satellite Communications

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“…The peak side lobe level is slightly greater than with the equiripple beamformer, but there is also a significant increase in sensitivity. (20) where the columns of are calibration vectors associated with constraint angles and is a vector of corresponding desired response values.…”

Section: Lcmv Beamformermentioning

confidence: 99%

“…[15]- [18]. Recent work in the area of satellite communications has even included discussion on space platform orbital PAF-fed reflectors to provide adaptation to a changing radio environment [19], [20]. Though phased array antenna theory and design are relatively mature fields, the stringent demands of radio astronomical observation, including observing at very low signal to noise ratios (SNR) and the need for extreme pattern and gain stability, have until very recently kept these techniques from use in feed designs for the large dish instruments.…”

mentioning

confidence: 99%

Beamformer Design Methods for Radio Astronomical Phased Array Feeds

Elmer

Jeffs

Warnick

et al. 2012

IEEE Trans. Antennas Propagat.

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A major emphasis in current radio astronomy instrumentation research is the use of phased array feeds (PAF) to provide radio telescopes with larger fields of view. One of the challenges of PAF systems is the design of beamformers that provide sufficient sensitivity and known, stable beam pattern structure. High sensitivity has been achieved with the maximum sensitivity beamformer without regard to beam pattern shape. Deterministic beamformers provide the desired pattern shape control, but suffer from a significant reduction in sensitivity. We present a hybrid beamforming method, which balances the tradeoff between high sensitivity and precise beam pattern shape control. A comparison of each of these beamforming methods, using measured data, confirms the advantage of the hybrid approach. The pattern distortions introduced by modeled beamformers can be mitigated with a transformation step, but ultimately it is shown that PAF beamformer design is best done using measured calibrators. A PAF calibration vector quality metric based on minimum description length is also introduced.Index Terms-Antenna array feeds, array signal processing, phased arrays, radio astronomy.

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“…On the other hand, as previously studied in many literatures especially, integration of active circuitry into PAAs gives many advantages to output power of the transmitter, efficiency, impedance, and radiation characteristics as well as multi‐functionality at microwave frequencies. In this area, the key parameter of the design is the total transmission quality that is most dependent upon the nonlinear performance of the active module, such as solid state power amplifiers (SSPAs) . In active PAA, the nonlinear performance of the SSPA connected to each radiating element produces un‐desired intermodulation products (IMPs) which can be also radiated .…”

Section: Introductionmentioning

confidence: 99%

Frequency-dependent behavioral-model-based nonlinear analysis and design of a low-profile transmit active phased array antenna

Zaker

Abdipour

Tavakoli

et al. 2018

Int J RF Microw Comput Aided Eng

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Design and behavioral‐model‐based nonlinear analysis of a 3‐GHz active‐phased array antenna (APAA) are presented. Four nonlinear power amplifiers are employed in the output ports of the feeding network (FN) and analyzed based on a 5‐order polynomial model with frequency‐dependent coefficients. The FN is based on 4‐port new Gysel power dividers and combiners arranged in such a way to feed the array with Gaussian‐like amplitude and in‐phase distributions. Beam steering capability is obtained in 2 directions by a new technique including a phase shifter and an amplitude controller (AC). The features result in a low‐profile APAA whose design and fabrication complexity and cost are reduced. Single and 2‐tone power tests are performed to develop analytical expressions in nonlinear region for array factor as a function of the model, FN and the phase and ACs. A similar system with frequency‐independent model is also analyzed for comparison in terms of scan loss, beamwidth, side‐lobe level, beam position, and gain. A microstrip array antenna including the power amplifiers, pre‐amplifiers, AC, delay‐line‐based phase shifters and Gysels is fabricated and measured. The simulation results at the single and dual tones and the intermodulation products are presented which have a good agreement with the measurements.

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Theoretical and Experimental Study of Interference in Multibeam Active Phased Array Transmit Antenna for Satellite Communications

Cited by 33 publications

References 11 publications

System Aspects of Active Phased Arrays

System Aspects of Active Phased Arrays

Beamformer Design Methods for Radio Astronomical Phased Array Feeds

Frequency-dependent behavioral-model-based nonlinear analysis and design of a low-profile transmit active phased array antenna

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