Electronically steerable array antennas for mobile satellite communications-a review

Karmakar, Nemai Chandra; Bialkowski, M.E.

doi:10.1109/past.2000.858914

Cited by 7 publications

(8 citation statements)

References 9 publications

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“…The rapid growth of broadband services has created an attractive market for several applications such as mobile satellite terminals as well as maritime, aeronautical, and land applications. These terminals provide on-the-move multimedia satellite broadcasting services for several bands of frequency (L-band, Ku-band, and K/Ka-band), and they all require cost-effective, agile, and steerable antenna front-ends [129,130]. The requirement for more complex circuitry and functionality of the RF module for the broadband services stipulated for the development of new integration techniques.…”

Section: Ltcc Application In Electronically Steerable Antennamentioning

confidence: 99%

Antenna in LTCC Technologies: A Review and the Current State of the Art

Ullah

Mahyuddin

Arifin

et al. 2015

IEEE Antennas Propag. Mag.

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This paper presents a chronological review of the research carried out on antennas in low-temperature cofired ceramics (LTCC) technology over the last ten years or so. Major breakthroughs in LTCC technologies and its shortcomings are highlighted. The current state of the art of LTCC-technology-based antennas is then evaluated. All realizable features of the LTCC-based antennas, which are compact and of light weight and offer high-speed functionality for portable electronic devices, are illustrated. Different techniques used by researchers for broadbanding, multiband designs, and fabrication of LTCC-based antennas are also presented. This paper ends with some recommendations and concluding remarks.

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Section: Ltcc Application In Electronically Steerable Antennamentioning

confidence: 99%

Antenna in LTCC Technologies: A Review and the Current State of the Art

Ullah

Mahyuddin

Arifin

et al. 2015

IEEE Antennas Propag. Mag.

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“…They can electronically switch between beams, thus exhibiting some degree of steering. Switched-beam antennas are more cost effective than phased-array antennas [15]. However, their limited beam-steering capability may make the transmitter-receiver beam alignment pretty rigid.…”

Section: A Antenna Modelmentioning

confidence: 99%

A Distributed Asynchronous Directional-to-Directional MAC Protocol for Wireless Ad Hoc Networks

Shihab

Cai

Pan

2009

IEEE Trans. Veh. Technol.

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Abstract-The use of directional antennas in ad hoc networks has received growing attention because of its high spatial reuse and high antenna gains. The medium access control (MAC) protocol design with directional antennas is nontrivial due to the deafness and collision problems. The existing protocols assumed that the nodes can operate in both directional and omnidirectional modes. However, using both modes leads to the asymmetry-in-gain problem. In this paper, we propose a directional-to-directional (DtD) MAC protocol, where both senders and receivers operate in a directional-only mode. We also derive the saturation throughput of ad hoc networks using DtD MAC. The analytical and simulation results show that DtD MAC can significantly improve the throughput and maintain good fairness among competing flows. We further evaluate the DtD MAC with millimeter-wave (mmWave) communication technologies, which rely on a directional antenna to perform well and can achieve gigabit data rates. The results obtained are exciting and show that DtD MAC is a promising candidate for mmWave ad hoc networks.Index Terms-Ad hoc networks, directional antennas, medium access control (MAC) protocols, millimeter wave (mmWave).

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“…Electronically steerable radio-frequency (RF) aperture antennas are highly demanded by a vast number of applications, such as radar, cognitive radio, wireless communications, and microwave imaging [1][2][3][4][5][6][7][8][9]. The design and implementation of digital aperture array beamformers having several octaves of bandwidth at relatively constant far-field beam shape in the polar pattern is of interest for ultra-wide-band (UWB) systems [10].…”

Section: Introductionmentioning

confidence: 99%

“…That is, we attain parallel throughput by processing an UWB signal having RF content of N p ∈ ℤ fold bandwidth in comparison with the maximum clock ceiling F clk,max of the digital VLSI platform under consideration. Such an increase in bandwidth to 1 2 N p F clk;max is accomplished without use of polyphase signal processing or timeinterleaved ADC methods [22,23]. Moreover, polyphase signal processing and time-interleaved methodologies require high phase synchronization, which is a major challenge in its practical implementation.…”

Section: Introductionmentioning

confidence: 99%

Wide‐band aperture array using a four‐channel manifold‐type planar multiplexer and digital 2‐D IIR filterbank

Sengupta

Madanayake

Gómez‐García

et al. 2016

Circuit Theory & Apps

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SUMMARYEmerging wide-band communications and spectrum-sensing systems demand support for multiple electronically scanned beams while maintaining a frequency independent, constant far-field beam width. Realizing existing phased-array technology on a digital scale is computationally intensive. Moreover, digitizing wide-band signals at Nyquist rate requires complex high-speed analog-to-digital converters (ADCs), which is challenging for real developments driven by the current ADC technology. A low-complexity alternative proposed in this paper is the use of radio-frequency (RF) channelizers for spectrum division followed by sub-sampling of the RF sub-bands, which results in extensive reduction of the necessary ADC operative frequency. The RF-channelized array signals are directionally filtered using 2-D digital filterbanks. This mixed-domain RF/digital aperture array allows sub-sampling, without utilizing multi-rate 2-D systolic arrays, which are difficult to realize in practice. Simulated examples showing 14-19 dB of rejection of wide-band interference and noise for a processed bandwidth of 1.6 GHz are demonstrated. The sampling rate is 400 MHz. The proposed VLSI hardware uses a single-phase clock signal of 400 MHz. Prototype hardware realizations and measurement using 65-nm Xilinx field-programmable gate arrays, as well as Cadence RTL synthesis results including gate counts, area-time complexity, and dynamic power consumption for a 45-nm CMOS circuit operating at B DC = 1.1 V, are presented.

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Electronically steerable array antennas for mobile satellite communications-a review

Cited by 7 publications

References 9 publications

Antenna in LTCC Technologies: A Review and the Current State of the Art

Antenna in LTCC Technologies: A Review and the Current State of the Art

A Distributed Asynchronous Directional-to-Directional MAC Protocol for Wireless Ad Hoc Networks

Wide‐band aperture array using a four‐channel manifold‐type planar multiplexer and digital 2‐D IIR filterbank

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