Showing 1-25 of 390 resultsfor "Index Terms":beam squint
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Beam Squint Effect in Multi-Beam mmWave Massive MIMO Systems
2022 IEEE 96th Vehicular Technology Conference (VTC2022-Fall)
Year: 2022 | Conference Paper |
Cited by: Papers (5)
In multicarrier wideband millimeter-wave (mmWave) communications, as the size of antenna array increases, as in massive multiple-input multiple-output (MIMO), an additional propagation delay of the electromagnetic wave at each antenna element is introduced comparable to (or greater than) the symbol duration, resulting in producing a displacement in beam direction at each subcarrier frequency or as...Show More
Wideband Transmit-Reflectarray With Tilted Beams Considering Beam Squint Effect
In this letter, we presents a modified multifrequency phase synthesis approach to design the wideband transmit-reflectarray (TRA) with tilted beams considering the beam squint effect. Unlike the conventional phase synthesis approach, the effectiveness of the method is improved by introducing the predeviated beam direction at optimized frequency point to mitigate the beam squint, thus achieving a w...Show More
A wideband base station antenna with reduced beam squint
12th European Conference on Antennas and Propagation (EuCAP 2018)
Year: 2018 | Conference Paper |
This paper presents the design procedure, theoretical analysis, and experimental results of a novel wideband dual-polarized base station antenna. The proposed antenna consists of four electric folded dipoles arranged in an octagon shape that are excited simultaneously for each polarization. It provides the ±45° slant-polarized radiation that meets all the required specifications for base station a...Show More
Dual-Beam Periodic Leaky-Wave Antenna With Reduced Beam Squinting
In this letter, a dual-beam periodic leaky-wave antenna with a low beam-squinting character is presented. It has a simple and low-profile configuration, which consists of 15 slot radiating elements and one microstrip feedline. The slot radiating element creates nulls in the pattern at forward and backward endfire. By properly arranging the radiating elements with a small separation, the higher ord...Show More
A Study of Multiple Image Acquisition on Stripmap SAR for Wide Beam Antenna and High Squint Case
2019 International Symposium on Antennas and Propagation (ISAP)
Year: 2019 | Conference Paper |
This paper introduces the theoretical explanation of verifying the multiple image acquisition method on Stripmap SAR (Synthetic Aperture Radar). This technique is needed for generating video images when wide beam antenna and high squint conditions are satisfied. It also explains why wide beam antenna and high squint case conditions are required. Furthermore, we show the simulation results using th...Show More
Residual Beam Squint Effect of a Photonic Supported Beam Steering Scheme Based on Continuously Tuneable Mach-Zehnder Interferometers
2020 12th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)
Year: 2020 | Conference Paper |
In this paper, we assess by simulation the residual beam squint effect of a millimeter-wave (mmWave) beam forming scheme of a phased array antenna (PAA) receiver supported by a continuously tunable Mach-Zehnder interferometer (CT-MZI). The CT-MZI provides a delay that depends on the operating frequency. Therefore, a high bandwidth signal will experience a non-constant group delay over its bandwidt...Show More
Beam Squint Mitigation Using Digital Beam Formers for Wideband Radar Applications
2021 2nd International Conference on Range Technology (ICORT)
Year: 2021 | Conference Paper |
Cited by: Papers (2)
In modern phased array radars, digital beamformers are used for beam steering in transmit and receive operations. Most of the conventional radars operate in narrowband applications with phase shift beamformers. The high-resolution imaging radars operating with wide bandwidths suffer from beam squint with phase shift beamformers. In this work, a methodology is proposed to address this effect throug...Show More
Phased-array antenna beam squinting related to frequency dependency of delay circuits
Seyed Kasra Garakoui;Eric A. M. Klumperink;Bram Nauta;Frank E. van Vliet
2011 41st European Microwave Conference
Year: 2011 | Conference Paper |
Practical time delay circuits do not have a perfectly linear phase-frequency characteristic. When these delay circuits are applied in a phased-array system, this frequency dependency shows up as a frequency dependent beam direction (“beam squinting”). This paper quantifies beam squinting for a linear one-dimensional phased array with equally spaced antenna elements. The analysis is based on a (fre...Show More
Phased-array antenna beam squinting related to frequency dependency of delay circuits
Seyed Kasra Garakoui;Eric A.M. Klumperink;Bram Nauta;Frank E. van Vliet
2011 8th European Radar Conference
Year: 2011 | Conference Paper |
Practical time delay circuits do not have a perfectly linear phase-frequency characteristic. When these delay circuits are applied in a phased-array system, this frequency dependency shows up as a frequency dependent beam direction ("beam squinting"). This paper quantifies beam squinting for a linear one-dimensional phased array with equally spaced antenna elements. The analysis is based on a (fre...Show More
A Uniplanar $3\times 3$ Nolen Matrix Beamformer with Beam Squint Reduction
2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting
Year: 2020 | Conference Paper |
Cited by: Papers (1)
In this paper, a uniplanar 3×3 Nolen matrix is proposed to improve the beam squinting for spatial FFT beamformer. The proposed multiple beam feeding network has three input ports and three output ports, and the signal is divided into three equal magnitudes and features unique progressive phase shifts at its output ports for each input ports excitation. To reduce the variation of progressive phase ...Show More
Beamforming on Reconfigurable Intelligent Surface: A Codebook Design for Spatial Coverage with Beam Squint Effect
Xinyi Lin;Yihong Liu;Lei Zhang;Anvar Tukmanov;Qammer Abbasi;Muhammad Ali Imran
2023 IEEE International Conference on Communications Workshops (ICC Workshops)
Year: 2023 | Conference Paper |
In this paper, we propose a novel reconfigurable intelligent surface (RIS) codebook design by leveraging beam squint with the help of half-power beamwidth (HPBW) concept. In particular, the beam squint effect incurs the array responses' direction change of RIS under different frequencies. We aim to design the RIS phase shifts such that the beams with squint generated by different RIS weights could...Show More
Frequency-Domain Signal Reconstruction for Dynamic Time-Domain Weighting Hybrid Precoding with Beam Squint
ICASSP 2024 - 2024 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
Year: 2024 | Conference Paper |
Hybrid precoding is considered in wideband mm-Wave massive MIMO-OFDM systems with beam squint. Traditional wideband hybrid precoding schemes cannot achieve near-optimal sum rate as digital precoding/beamforming (DBF) and may induce high hardware cost. Dynamic time-domain weighting hybrid precoding (DTW-HBF) updates the analog weights during an OFDM symbol, realizing equivalent frequency-dependent ...Show More
Space-Time Block Coding-Based Beamforming for Beam Squint Compensation
In this letter, the beam squint problem, which causes significant variations in radiated beam gain over frequencies in a millimeter wave communication system, is investigated. A constant modulus beamformer design, which is formulated to maximize the expected average beam gain within the bandwidth with limited variation over frequencies within the bandwidth, is proposed. A semidefinite relaxation m...Show More
Beam Squint Compensation in Circularly Polarized Offset Reflector Antennas Using a Sequentially Rotated Focal-Plane Array
The problem of beam squinting in circularly polarized offset reflector antennas is solved by using a novel focal-plane array concept that consists of sequentially rotated linearly polarized elements. This concept can be used to facilitate beam steering in full-duplex communication with satellite Internet (VSAT) operating in the Ka-band. A prototype consisting of a 75-cm offset dish illuminated by ...Show More
Beam squint correction in offset reflector antennas with circularly-polarized tapered primary feeds
2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting
Year: 2015 | Conference Paper |
Cited by: Papers (1)
A circularly polarized matched feed is utilized to correct the adverse property of squinted beams of the secondary radiation patterns in offset parabolic reflector antennas. The matched feed is a circularly polarized dual-mode waveguide antenna, producing a tapered distribution at its fundamental mode. The modes of interest are the TE11 and TE21 type modes of circular waveguides.Show More
Precoding Design for OTFS-MIMO System with Beam Squint Effect
2024 IEEE Wireless Communications and Networking Conference (WCNC)
Year: 2024 | Conference Paper |
The emerging Orthogonal Time Frequency Space (OTFS) technique can achieve stable communication in high-speed mobile scenarios, which combining with multiple-input multiple-output (MIMO) can improve the spectrum and energy efficiency of wireless communication systems. To achieve potential performance gains of OTFS-MIMO systems, this paper considers the precoding design for wideband OTFS-MIMO system...Show More
A modified RD algorithm for airborne high squint mode SAR imaging
2007 1st Asian and Pacific Conference on Synthetic Aperture Radar
Year: 2007 | Conference Paper |
Cited by: Papers (1)
Based on the imaging geometry of the squint mode, this paper derives a modified range-Doppler(RD) algorithm suited for high squint mode Synthetic Aperture Radar(SAR) imaging in detail. On the basis of the high order range mode, the algorithm realizes the fine focusing of targets by correcting range walk while performing range compression and correcting range curvature in two dimensional frequency ...Show More
Cancellation of Beam Squint with Frequency in Serial Beamforming Network-Fed Linear Array Antennas
This communication investigates the capability of serial beamforming networks to cancel beam squint with frequency in linear array applications. Such a property could be of interest for broadband applications with multiple narrow beams. The theoretical aspects are described, as well as the impact on the beamforming network design. It is found that the main limitation to achieving beam-squint cance...Show More
Unit cell structure of Huygens' Metasurfaces Reducing Beam Squint in Series-Fed Array
Maria Ishida;Keizo Cho;Naobumi Michishita;Tanan Hongnara;Takayoshi Sasaki;Warangkana Chaihongsa;Keisuke Sato;Ichiro Oshima;Hiroaki Nakabayashi
2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)
Year: 2022 | Conference Paper |
Huygens' metasurfaces have attracted attention as a method for constructing thin lenses. In this report, we focus on I-shaped elements as an example of a structure of Huygens' metasurface and propose a lens that can change the pass-through phase at 28 GHz with the maximum of −2 dB loss and almost no phase change at 25.75 GHz using Huygens' metasurface.Show More
Surface-micromachined micro-XYZ stages for free-space microoptical bench
Micro-XYZ stages have been monolithically integrated with microactuators and out-of-plane microoptical elements, all fabricated by the same surface-micromachined process, on Si free-space microoptical bench. Optical beam adjustment with three degrees of freedom has been realized without angular squinting. A positioning accuracy of 11 nm has been achieved by the integrated scratch drive actuators, ...Show More
Surface-micromachined micro-XYZ stages for free-space micro-optical bench
Digest IEEE/Leos 1996 Summer Topical Meeting. Advanced Applications of Lasers in Materials and Processing
Year: 1996 | Conference Paper |
The surface-micromachined free-space micro-optical bench (FS-MOB) has demonstrated its potential for monolithically integrating entire micro-optical systems on a single chip. In this paper, we propose a novel integrated XYZ stage with three degrees of freedom for precise on-chip optical alignment as well as input/output coupling for the FS-MOB.Show More
Performance Analysis and Codebook Design for mmWave Beamforming System With Beam Squint
Beamforming technology is widely used in millimeter wave systems to combat path losses, and beamformers are usually selected from a predefined codebook. Unfortunately, the traditional codebook design neglects the beam squint effect, and this will cause severe performance degradation when the bandwidth is large. In this letter, we consider that a codebook with fixed size is adopted in the wideband ...Show More
Magneto-Electric-Dipole-Based Leaky-Wave Radiating Structure with Reduced Frequency-Dependent Beam Squint
Yue-Long Lyu;Fan-Yi Meng;Ke Wu;Qun Wu;Guo-Hui Yang;Cong Wang
2018 IEEE/MTT-S International Microwave Symposium - IMS
Year: 2018 | Conference Paper |
Cited by: Papers (2)
Frequency-induced beam squint is probably the biggest hurdle in some cases that limits the application of leaky-wave antennas (LWAs) and leaky-wave radiating structures (LWRSs) to communication systems. In this paper, we derive a frequency-phase condition of guided-wave radiation elements in an LWA or LWRS to prevent beam squint from frequency scanning. It is found out that magneto-electric (ME) d...Show More
Beam Squint Suppression in Offset-Fed Reflectarrays
E'qab Almajali;Derek A. McNamara;Jafar Shaker;M. Reza Chaharmir
A novel approach is proposed to suppress the frequency-dependent beam squint of offset-fed reflectarray patterns. The design comprises two offset feeds located at opposite ends of the reflectarray, in the plane of offset, simultaneously illuminating the reflectarray. This generates a single beam that does not squint from the desired design direction at off-center frequencies. The concept is valida...Show More
Hybrid Precoding for Mitigating the Beam Squint in Wideband mmWave MIMO System
Hybrid precoding (HPC) can significantly reduce the hardware cost of the massive multiple-input multiple-output (MIMO) system. However, the beam squint cannot be ignored for a wideband MIMO system. In this letter, we design an HPC algorithm to mitigate the beam squint in a wideband system. The alternative minimization framework is used to design the analog precoding with a constant modulus constra...Show More
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