An intermodulation suppression technique for transmit active phased array satellite antennas with multiple shaped beams

Lier, E.; Cherrette, A.

doi:10.1109/tap.2005.846455

Cited by 12 publications

(2 citation statements)

References 8 publications

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“…In a system with multiple single tone beams, IMD can be spatially reduced by using different phase distributions for each frequency to minimize IMD radiation pattern overlapping at the used frequencies [9]. Reduction of IMD in a situation with multiple beams with modulated signals can be done with beams that are narrow by steering the beams to different directions [10].…”

Section: Introductionmentioning

confidence: 99%

Over-the-Air Suppression of Third-Order Intermodulation in a Two-Beam Steered Amplifier-Antenna Array

Kutinlahti,

Lehtovuori,

Viikari

2023

IEEE Access

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The effect of load-pull on 3rd order intermodulation (IM3) radiation characteristics of a transmitting active phased array is studied and a general model for predicting the spatial distribution of fundamental tones and intermodulation products is introduced. The used data is obtained from a load pull measured amplifier prototype and a simulated linear antenna array, which are used in co-simulation of the system behavior. The system is optimized for maximum main tone beam powers with a two-tone excitation while satisfying a signal-to-IM3 ratio (SI3R) of 40 dB. In this paper, we demonstrate the case, where two separate beams are scanned independently from each other. The used load-pull system model achieves on average an improvement of 10.4 dB for SI3R, when compared to traditional small-signal modelling, while decreasing the main beam power densities by only 0.3 dB when compared to traditional small-signal modelling. Optimizing for SI3R degrades beam pattern by increasing beamwidths and decreasing sidelobe levels (SLL).INDEX TERMS Active phased arrays, amplifier, beam-steering, intermodulation, load pull, third-order intermodulation product (IM3)

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Section: Introductionmentioning

confidence: 99%

Over-the-Air Suppression of Third-Order Intermodulation in a Two-Beam Steered Amplifier-Antenna Array

Kutinlahti,

Lehtovuori,

Viikari

2023

IEEE Access

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“…The idea of combining the radiation of multiple antennas to obtain specific pattern shape dates back to the beginning of the 19th century, when the history of wireless communications began [1,2]. Nowadays, antenna arrays are widely used in a large variety of scenarios involving far-and near-field focusing/multifocusing applications for satellite, cellular, vehicular, and sensor networks [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. However, even if the array technology is already widespread, its importance is expected to further increase, since the directionality of the communications will represent a basic enabling functionality of the forthcoming fifth-generation (5G) and Internet of things (IoT) systems [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Geometrical Synthesis of Sparse Antenna Arrays Using Compressive Sensing for 5G IoT Applications

Buttazzoni

Babich

Vatta

et al. 2020

Sensors

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One of the main targets of the forthcoming fifth-generation (5G) cellular network will be the support of the communications for billions of sensors and actuators, so as to finally realize the Internet of things (IoT) paradigm. This pervasive scenario unavoidably requires the design of cheap antenna systems with beamforming capabilities for compensating the strong attenuations that characterize the millimeter-wave (mmWave) channel. To address this issue, this paper proposes an iterative algorithm for sparse antenna arrays that enables to derive the number of elements, their amplitudes, phases, and positions in the presence of constraints on the far-field pattern. The algorithm, which relies on the compressive sensing approach, is formulated by transforming the original nonconvex optimization problem into a convex one. To prove the suitability of the conceived solution for 5G IoT mmWave applications, numerical examples and comparisons with other existing methods are provided, considering synthesis problems with different pattern and aperture specifications.

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Novel Reduction Technique of the Non-linear Distortion at the Receiving Point in the Multi-beam Active Phased Array Antenna

Yamauchi

Nakayama

Ikeda

et al.

2005 Asia-Pacific Microwave Conference Proceedings

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An intermodulation suppression technique for transmit active phased array satellite antennas with multiple shaped beams

Cited by 12 publications

References 8 publications

Over-the-Air Suppression of Third-Order Intermodulation in a Two-Beam Steered Amplifier-Antenna Array

Over-the-Air Suppression of Third-Order Intermodulation in a Two-Beam Steered Amplifier-Antenna Array

Geometrical Synthesis of Sparse Antenna Arrays Using Compressive Sensing for 5G IoT Applications

Novel Reduction Technique of the Non-linear Distortion at the Receiving Point in the Multi-beam Active Phased Array Antenna

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