Results 21 to 30 of about 518,836 (208)

Large Scale Optical Assisted Mm-Wave Beam-Hopping System for Multi-Hop Bent-Pipe LEO Satellite Networks

Applied Sciences, 2023
By introducing the arrayed waveguide router (AWGR) optical true time-delay (OTTD) architecture in bent-pipe satellite optical inter-link to optically assist the RF phased array in Low-earth orbit satellites will extend the multi-hop bent-pipe satellite ...
Shiyi Xia, Peilong Liu, Mingyang Zhao, Cheng Zou, Fengwei Shao, Jifeng Jin, Haiwang Wang, Guotong Li   +7 more
doaj   +1 more source

Compact digital phase shifter utilising negative phase velocity

Electronics Letters, 2008
A compact digital phase shifter is presented utilising negative phase velocity in metamaterial technology. The phase shifter was designed and it was measured ranging from 0deg to 360deg with discrete increments of 60deg. The measurement result shows that the average increment of phase shift was X = 59.28deg and its standard deviation was sigma = 6 ...
J.H. Choi, C.W. Jung
openaire   +1 more source

Reconfigurable Liquid Metal-Based SIW Phase Shifter

IEEE transactions on microwave theory and techniques, 2021
This article presents the first substrate integrated waveguide (SIW) phase shifter that can be reconfigured using liquid metal (LM). This digital phase shifter exhibits low insertion loss and is reciprocal and bidirectional.
Shaker Alkaraki, A. Borja, J. Kelly, R. Mittra, Yue Gao   +4 more
semanticscholar   +1 more source

Proposing a Modified Switchable Schiffman Structure to Implement a Wideband and Low-Loss 4-bit Digital Phase Shifter

IEEE Access
This paper proposes a modified Schiffman structure to implement a wideband, low-loss 4-bit digital phase shifter. Here, low-cost positive intrinsic negative (PIN) diodes are used for electronically controlling the phase states of the phase shifter.
Mostafa Khazaei, Seyyed Hossein Mohseni Armaki, Amir Saman Noor Amin   +2 more
doaj   +1 more source

Performance Evaluation of Analog Beamforming with Hardware Impairments for mmW Massive MIMO Communication in an Urban Scenario

Sensors, 2016
The use of massive multiple-input multiple-output (MIMO) techniques for communication at millimeter-Wave (mmW) frequency bands has become a key enabler to meet the data rate demands of the upcoming fifth generation (5G) cellular systems.
Sonia Gimenez, Sandra Roger, Paolo Baracca, David Martín-Sacristán, Jose F. Monserrat, Volker Braun, Hardy Halbauer   +6 more
doaj   +1 more source

The Design of a 140 GHz 28 nm CMOS Vector-Sum Phase Shifter Based on Gilbert Cell and Current-Steering Amplifiers

Chips
This paper presents the design of a 140 GHz vector-sum phase shifter in a 28 nm CMOS process. Two variable-gain amplifiers—Gilbert cell and current-steering amplifiers—are investigated and compared.
Junyung Cho, Jung-Hyun Lee, M. Kim
doaj   +1 more source

A Multimode 28 GHz CMOS Fully Differential Beamforming IC for Phased Array Transceivers

Sensors, 2023
A 28 GHz fully differential eight-channel beamforming IC (BFIC) with multimode operations is implemented in 65 nm CMOS technology for use in phased array transceivers. The BFIC has an adjustable gain and phase control on each channel to achieve fine beam
Ayush Bhatta, Jeongsoo Park, Donghyun Baek, Jeong-Geun Kim   +3 more
doaj   +1 more source

A 7-Bit Vector-Sum Phase Shifter for LEO Satellite Communication in 90-Nm CMOS Process

IEEE Access
This paper presents a 7-bit vector-sum phase shifter for low-earth-orbit satellite communication. The phase shifter consists of a differential-type quadrature all-pass filter (QAF) and an analog differential vector adder, where a matching network is ...
Hao-Jen Tu, Hsiao-Chin Chen, Pin-Hsuan Chen, Po-Yen Huang   +3 more
doaj   +1 more source

A Lossy Capacitance Measurement Circuit Based on Analog Lock-in Detection

Elektronika ir Elektrotechnika, 2020
This paper presents a lossy capacitance measuring circuit which is based on analog lock-in detection technique. Lossy capacitance can be modelled as a pure capacitor connected in parallel with a resistor.
Mehmet Demirtas, Mehmet Akif Erismis, Salih Gunes   +2 more
doaj   +1 more source

Periodic template compensation phase feeding method for phased array antenna

IET Microwaves, Antennas & Propagation, 2023
To minimise the beam‐pointing error caused by the digital phase shifter in phased array antenna systems, a periodic template compensation (PTC) phase feeding algorithm is proposed in this study.
Renli Zhang, Nuo Chen, Shuang Qiu, Weixing Sheng   +3 more
doaj   +1 more source