Results 21 to 30 of about 91,608 (298)
Applied Sciences, 2021 For an RF system, a high-gain antenna helps to improve the equivalent isotropic radiated power (EIRP) of the transmitter and an end-fire antenna array helps to improve the directivity (D) and half power beam width (HP) of the antenna.
Yanfei Mao, Shiju E, Chungeng Zhu
doaj +1 more source
PROSPECTS FOR THE DEVELOPMENT OF PHASED ANTENNA ARRAYS
Вестник Дагестанского государственного технического университета: Технические науки, 2016 This article describes the main achievements in the development of phased antenna arrays (par) in the past decade. Provides an overview of the most famous systems based on the PAR and PAR based on MMIC technology - PAR in radar stations, PAR to control ...
A. P. Dzuba
doaj +1 more source
Atacama compact array antennas [PDF]
SPIE Proceedings, 2012 We report major performance test results of the Atacama Compact Array (ACA) 7-m and 12-m antennas of ALMA (Atacama Large Millimeter/submillimeter Array). The four major performances of the ACA antennas are all-sky pointing (to be not more than 2.0 arcsec), offset pointing (to be < 0.6 arcsec) surface accuracy (< 25(20) micrometer for 12(7)m ...
Saito, Masao +10 more
openaire +2 more sources
Sidelobe Reductions of Antenna Arrays via an Improved Chicken Swarm Optimization Approach
IEEE Access, 2020 Antenna arrays are able to improve the directivity performance and reduce the cost of wireless communication systems. However, how to reduce the maximum sidelobe level (SLL) of the beam pattern is a key problem in antenna arrays.
Shuang Liang +5 more
doaj +1 more source
Kernel Antenna Array Processing [PDF]
IEEE Transactions on Antennas and Propagation, 2007 We introduce two support vector machine (SVM)-based approaches for solving antenna problems such as beamforming, sidelobe suppression, and maximization of the signal-to-noise ratio. A basic introduction to SVM optimization is provided and a complex nonlinear SVM formulation developed to handle antenna array processing in space and time.
Martínez Ramón, Manel +3 more
openaire +3 more sources
IEEE Access, 2021 Two designs of conical-beam array antennas are presented for different fifth-generation applications. They are based on slotted cylindrical waveguides and a travelling-wave topology, where the waveguide is used to progressively excite a cross-slot array.
Pablo Sanchez-Olivares +2 more
doaj +1 more source
Sequential Rotation of Antenna Array Elements – Rotation Angle for Optimum Array Polarization [PDF]
Advances in Radio Science, 2023 The principle of sequential rotation, a well-known method to arrange the radiating elements of antenna arrays, is briefly described, and the impact on the polarization of different antenna array configurations is presented. The influence of the number of
K. Kuhlmann
doaj +1 more source
100 GHz Silicon-based micro-machined patch antenna and arrays
The Journal of Engineering, 2019 This study designs a micro-machined BCB-cavity patch antenna and two types of four-element micro-machined antenna arrays at 100 GHz. The patches are fabricated on Benzocyclobutene (BCB) polymer material.
Jingtian Liu +3 more
doaj +1 more source
Comparison of Microwave Hyperthermia Applicator Designs with Fora Dipole and Connected Array
Sensors, 2023 In microwave hyperthermia tumor therapy, electromagnetic waves focus energy on the tumor to elevate the temperature above its normal levels with minimal injury to the surrounding healthy tissue.
Gulsah Yildiz +7 more
doaj +1 more source
Conformal Antenna Array for Millimeter-Wave Communications: Performance Evaluation
, 2015 In this paper, we study the influence of the radius of a cylindrical supporting structure on radiation properties of a conformal millimeter-wave antenna array.
Bisognin, A. +7 more
core +1 more source