Results 261 to 270 of about 36,924 (279)

A 90° Waveguide Hybrid with Low Amplitude Imbalance in Full W-Band

Journal of Infrared, Millimeter, and Terahertz Waves, 2019
This paper reports a high-performance 90° waveguide hybrid coupler working in the full W-band. We demonstrate an 8-branch hybrid which features the low amplitude imbalance over a wide band by first increasing the waveguide height inwards and second introducing waveguide height discontinuity sections on the other inner side.
Jiangqiao Ding, Yun Zhao, Jun-Xiang Ge, Shengcai Shi   +3 more
openaire   +1 more source

Diagnosis and compensation of amplitude imbalance, imperfect quadrant and offset in resolver signals

2016 7th Power Electronics and Drive Systems Technologies Conference (PEDSTC), 2016
In this paper, a new method for detecting some errors in resolver signals is presented. Sin and cosine signals in resolver to digital converter's (RDC's) input might have errors, such as amplitude imbalance, imperfect quadrant or DC offset. Like other sensors some defects in mechanical structure and electrical or magnetic circuits cause to these errors
N. Noori, D. A. Khaburi
openaire   +1 more source

Quadrature Phase Error and Amplitude Imbalance Effects on Digital Demodulator Performance

1996
This paper analyses the performance of M—QAM and M—PSK modulation schemes after frequency conversion using analogue quadrature hybrid circuits. In particular, the effects of carrier feed-through, quadrature phase error, amplitude imbalance, DC offset in the I and Q channels of the quadrature hybrid circuit are investigated.
J. J. Wojtiuk, M. Rice
openaire   +1 more source

Imbalance of group velocities for amplitude and phase pulses propagating in a resonant atomic medium

Physical Review A, 2016
The dynamics of light pulses with amplitude and phase modulations is investigated for a medium of resonant two-level atoms. It is shown that the pulse-like variations of the phase can be also described in terms of group velocity. It is found that in the nonlinear regime of atom-field interaction, the group velocities of amplitude and phase pulses can ...
M. Yu. Basalaev, A. V. Taichenachev, V. I. Yudin   +2 more
openaire   +1 more source

An amplitude and phase imbalance correction scheme for a switch ULA FMCW SAR system

2016 Progress in Electromagnetic Research Symposium (PIERS), 2016
A switch uniform linear array (ULA) frequency-modulated continuous-wave (FMCW) synthetic aperture radar (SAR) system transmits and receives FMCW waveform by firing elements of the ULA sequentially under the control of a switch network. Resolution in range is achieved by range compression and in ULA direction is achieved by digital beamforming. Compared
X. L. Yang, Y. P. Wang, Y. L. Qi
openaire   +1 more source

A Novel 90° Filtering Coupler With Low Amplitude Imbalance

2023 International Conference on Microwave and Millimeter Wave Technology (ICMMT), 2023
Lujie Liu, Bo Zhang
openaire   +1 more source

Amplitude-Optimized UZH for Polarimetric Channel Imbalance Calibration in PolSAR Data

IEEE Transactions on Geoscience and Remote Sensing, 2023
Lei Shi 0005, Le Yang, Weidong Sun, Jie Yang 0040, Pingxiang Li, Liangpei Zhang 0001   +5 more
openaire   +1 more source

Improving QPSK demodulator performance for quadrature receiver with information from amplitude and phase imbalance correction

2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540), 2002
In communication receivers, the gain and phase inbalance between the inphase and quadrature (I&Q) channels can cause serious degradation in receiver performance. Consider the problem of jointly estimating the four parameters of the received I&Q signals: the amplitude imbalance, the DC offset for each channel, and the phase onsets between the I&Q ...
openaire   +1 more source

A Novel Broadband 3 dB Branch Waveguide Directional Coupler With Ultra-Low Amplitude Imbalance

2023
Bingli Dai
exaly  

The Effect of Amplitude Imbalance on Compensated Carr-Purcell Sequences

Journal of Magnetic Resonance, Series A, 1993
openaire   +1 more source