Low cost electronically steered antenna and receiver system for mobile satellite communications

Alonso, J.I.; Blas, Julio; Garcia, Lino; Ramos, J. I.; Pablos, J. de; Grajal, Jesús; Gentilli, G.B.; Gismero, J.; Pérez, F.

doi:10.1109/mwsym.1996.511237

Cited by 8 publications

(6 citation statements)

References 8 publications

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“…Thus, each array weight can be denoted by a complex number (6) whose amplitude and phase depend on the control voltage. Both and functions do not have exact mathematical expressions and are found via measurements.…”

Section: B Voltage-controlled Beamformingmentioning

confidence: 99%

“…In coherent beamforming each array weight is proportional to the complex conjugate of its corresponding received signal [26]. Let denote the phase of the received signal by the th element, then the total received power through coherent beamforming is (27) where is the insertion loss of phase shifter defined in (6). Provided that all phase shifters are lossless, the coherent power is equal to , which is the maximum achievable power.…”

Section: Non-coherent Beamformingmentioning

confidence: 99%

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Fast Beamforming for Mobile Satellite Receiver Phased Arrays: Theory and Experiment

Fakharzadeh

Jamali

Mousavi³

et al. 2009

IEEE Trans. Antennas Propagat.

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The purpose of this paper is to present a robust and fast beamforming algorithm for the low-cost mobile phased array antennas. The proposed beamforming algorithm uses a sequentially perturbation gradient estimation method to update the control voltages of the phase shifters, with the objective of maximizing the received power by the array. This algorithm does not require either the knowledge of phase shifter characteristics or signal Direction-of-Arrival. Moreover, in this paper, the algorithm parameters are derived for the stationary and mobile platform configurations. For the stationary array, it is shown how the proper selection of the beamforming parameters limits the noise effects and increases the array output power. For the mobile array, a condition for the fast convergence is derived and the advantage of using nonuniform step size to update the control voltages is illustrated. When phase shifters suffer from the imbalanced insertion loss the proposed beamforming technique perturbs the phase-conjugate condition to increase the total received power. This algorithm has been implemented with the low-cost microwave components and applied to a Ku-band phased array antenna with 34 sub-arrays. The experimental results verify the broadband performance, and the fast convergence of the algorithm for different platform maneuvers.Index Terms-Adaptive array, beamforming, mobile phased array antenna, satellite communications, smart antenna.

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Section: B Voltage-controlled Beamformingmentioning

confidence: 99%

Section: Non-coherent Beamformingmentioning

confidence: 99%

Fast Beamforming for Mobile Satellite Receiver Phased Arrays: Theory and Experiment

Fakharzadeh

Jamali

Mousavi³

et al. 2009

IEEE Trans. Antennas Propagat.

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“…This is the case of phased arrays [1]. This kind of antennas has been used in radio frequency identification [2], mobile satellite applications [3,4], and radar systems [5]. In all the cases, the communication is affected by a mobility of the involved transmitter or receiver in the system.…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown that the solvers are accelerated by allocating the total computations and memory across the processors to the local memory of a distributed-memory cluster which communicate using the message-passing interface standard. Usually, the TD-AIM [4] is asymptotically inferior to multilevel PWTD schemes, and yet, it is relatively easy to implement, and efficient enough to remain competitive with the PWTD scheme for many practical problems. Compared to its frequency-domain counterpart, the TD-AIM scheme requires more memory because it needs to store the temporal history of sources to compute retarded fields throughout the auxiliary mesh.…”

Section: Introductionmentioning

confidence: 99%

Monopulse beam‐scanning planar array antenna in L band

Masa‐Campos¹,

Sánchez-Sevilleja²,

Dominguez-Grano-De-Oro³

et al. 2008

Micro & Optical Tech Letters

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part has a range from 0.817 to 0.822 at the frequency range from 0.23 to 0.38 THz.Figures 3(a) and 3(b) show experimental results when only one side is not optically excited and optically excited, respectively. Without light excitation, the measured transmission characteristic of the novel terahertz wave attenuator is shown in Figure 3(a). At this time, the high-resistivity silicon is a lossless dielectric material at terahertz wave. When the high-resistivity silicon wafer is optically excited, the free carriers are generated, and the silicon wafer becomes a lossy dielectric. Figure 3(b) shows the measured transmission characteristic of the novel terahertz wave attenuator with light excitation. A better than 10-dB attenuation with a 15% bandwidth of the center frequency (0.30 THz) is obtained at terahertz frequency range from 0.23 to 0.38 THz. CONCLUSIONA novel terahertz wave attenuator based on a high-resistivity silicon wafer is demonstrated at terahertz wave region by using experiment. The proposed terahertz wave attenuator has high extinction ratio, simplicity, small size, and low cost. It has a potential application to forthcoming terahertz wave communication systems. ABSTRACT: A planar antenna is presented as part of a Signal Identification System working at 1.06 GHz. The antenna presents a monopulse radiation pattern. Likewise, a scanning of the main beam direction is achieved in a Ϯ45°azimuth coverage. A limited 3 dB amplitude drop of the received signal at the edges of the angular scanning area is only permitted. Furthermore, a broad beamwidth is required in the single element of the array. A rectangular linearly polarized double stacked patch has been then designed, with a significant size reduction in the nonresonant length, to increase the azimuth beamwidth of the array single element. The whole antenna structure is composed of 18 elements, which have been distributed in six columns of three patches per column. The feeding network of the array has been developed in microstrip technology, with small individual circuits connected by coaxial cables, to reduce the global losses of the system. The designed compact antenna and the transmitting and receiving equipments will be placed inside a POD on the top part of an airplane. A prototype antenna has been manufactured and measured in three different beam pointing directions. Satisfactory results have been achieved in the entire frequency band. ABSTRACT: This letter presents an alternative implementation of the time domain adaptive integral method (TD-AIM) for solving combined field integral equation (CFIE) pertinent to electromagnetic surface scattering phenomena. We use the cubic spline as temporal basis function and analytically remove the rot operator from the integrals of far-zone interactions. Furthermore, we decompose the huge 4D FFT into several smaller ones in time domain. Consequently, the TD-CFIE can be solved with relatively littler memory and computational resources accurately. Simulation results have been presented and demonstrated the effectiv...

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“…The rapid development of VLSI techniques has made it feasible to take advantage of digital hardware. J. I. Alonso et a1 [12] has reported a 6-element adaptive array for integrated GPS and MSAT applications. The array consists of six broadband rectangular patches that are arranged in a hexagonal fashion.…”

Section: Adaptive Array Antennasmentioning

confidence: 99%

Electronically steerable array antennas for mobile satellite communications-a review

Karmakar

Bialkowski

Proceedings 2000 IEEE International Conference on Phased Array Systems and Technology (Cat. No.00TH8510)

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Low cost electronically steered antenna and receiver system for mobile satellite communications

Cited by 8 publications

References 8 publications

Fast Beamforming for Mobile Satellite Receiver Phased Arrays: Theory and Experiment

Fast Beamforming for Mobile Satellite Receiver Phased Arrays: Theory and Experiment

Monopulse beam‐scanning planar array antenna in L band

Electronically steerable array antennas for mobile satellite communications-a review

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