Single-layer dual-frequency unit for multifunction OAM reflectarray applications at the microwave range

2020 ◽  
Vol 45 (18) ◽  
pp. 5165
Author(s):  
Hui-Fen Huang ◽  
Shuai-Nan Li
Keyword(s):  
Single Layer ◽  
Microwave Range ◽  
Dual Frequency ◽  
Frequency Unit

scholarly journals A Novel Low Profile Dual-Frequency Shorted Patch Antenna

2020 ◽  
Vol 8 (5) ◽  
pp. 2469-2472
Keyword(s):  
Patch Antenna ◽  
Frequency Ratio ◽  
Single Layer ◽  
Patch Antennas ◽  
Dual Frequency ◽  
Planar Antennas ◽  
Radiation Characteristics ◽  
Small Frequency ◽  
Large Bandwidth ◽  
Low Profile

Dual-frequency planar antennas can substitute large bandwidth patch antennas, where there is a requirement for large bandwidth to cover two separate transmit receive bands. In this paper a novel single-feed, single layer, double-band, compact short loaded patch antenna is studied theoretically and experimentally. Besides the compactness, this design provides, dual frequency operation with a small frequency ratio of 1.3 between the two resonant bands. Various radiation characteristics are simulated as well as experimentally studied and good concurrence is observed between the simulated and measured results

scholarly journals Deep learning of total electron content

2021 ◽  
Vol 3 (7) ◽  
Author(s):  
Omid Memarian Sorkhabi
Keyword(s):  
Deep Learning ◽  
Total Electron Content ◽  
Single Layer ◽  
Activation Function ◽  
Satellite System ◽  
Single Frequency ◽  
Electron Content ◽  
Dual Frequency ◽  
Total Electron ◽  
Global Navigation Satellite

AbstractOne of the most notable errors in the global navigation satellite system (GNSS) is the ionospheric delay due to the total electron content (TEC). TEC is the number of electrons in the ionosphere in the signal path from the satellite to the receiver, which fluctuates with time and location. This error is one of the major problems in single-frequency (SF) GPS receivers. One way to eliminate this error is to use dual-frequency. Users of SF receivers should either use estimation models or local models to reduce this error. In this study, deep learning of artificial neural networks (ANN) was used to estimate TEC for SF users. For this purpose, the ionosphere as a single-layer model (assuming that all free electrons in the ionosphere are in this thin layer) is locally modeled by the code observation method. Linear combination has been used by selecting 24 permanent GNSS stations in the northwest of Iran. TEC was modeled independently of the geometry between the satellite and the receiver, called L4. This modeling was used to train the error ANN with two 5-day periods of high and low solar and geomagnetic activity range with a hyperbolic tangential sigmoid activation function. The results show that the proposed method is capable of eliminating ionosphere error with an average accuracy of 90%. The international reference ionosphere 2016 (IRI2016) is used for the verification, which has a 96% significance correlation with estimated TEC.

Single-layer dual frequency patch antenna

1993 ◽  
Vol 29 (16) ◽  
pp. 1441 ◽  
Author(s):  
S. Maci ◽  
Gentili Biffi ◽  
G. Avitabile
Keyword(s):  
Patch Antenna ◽  
Single Layer ◽  
Dual Frequency

Single-layer dual-frequency reflectarray for Ka-band antennas

2016 ◽  
Author(s):  
M. Abdollahvand ◽  
J. A. Encinar ◽  
K. Forooraghi ◽  
Z. Atlasbaf ◽  
M. Barba
Keyword(s):  
Single Layer ◽  
Dual Frequency ◽  
Ka Band
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