Scalable Multibeam Antenna Arrays Fed by Dual-Band Modified Butler Matrices

2016 ◽  
Vol 64 (4) ◽  
pp. 1287-1297 ◽  
Author(s):  
Krzysztof Wincza ◽  
Kamil Staszek ◽  
Izabela Slomian ◽  
Slawomir Gruszczynski
Keyword(s):  
Antenna Arrays ◽  
Dual Band ◽  
Multibeam Antenna

scholarly journals High-Efficiency, Dual-Band Beam Splitter Based on an All-Dielectric Quasi-Continuous Metasurface

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3184
Author(s):  
Jing Li ◽  
Yonggang He ◽  
Han Ye ◽  
Tiesheng Wu ◽  
Yumin Liu ◽  
...  
Keyword(s):  
Wavelength Range ◽  
Conversion Efficiency ◽  
Antenna Arrays ◽  
Beam Splitter ◽  
High Efficiency ◽  
Visible Region ◽  
Polarized Light ◽  
Dual Band ◽  
Phase Gradient ◽  
Total Transmission

Metasurface-based beam splitters attracted huge interest for their superior properties compared with conventional ones made of bulk materials. The previously reported designs adopted discrete metasurfaces with the limitation of a discontinuous phase profile. In this paper, we propose a dual-band beam splitter, based on an anisotropic quasi-continuous metasurface, by exploring the optical responses under x-polarized (with an electric field parallel to the direction of the phase gradient) and y-polarized incidences. The adopted metasurface consists of two identical trapezoidal silicon antenna arrays with opposite spatial variations that lead to opposite phase gradients. The operational window of the proposed beam splitter falls in the infrared and visible region, respectively, for x- and y-polarized light, resulting from the different mechanisms. When x-polarized light is incident, the conversion efficiency and total transmission of the beam splitter remains higher than 90% and 0.74 within the wavelength range from 969 nm to 1054 nm, respectively. In this condition, each array can act as a beam splitter of unequal power. For y-polarized incidence, the maximum conversion efficiency and transmission reach approximately 100% and 0.85, while the values remain higher than 90% and 0.65 in the wavelength range from 687 nm to 710 nm, respectively. In this case, each array can be viewed as an effective beam deflector. We anticipate that it can play a key role in future integrated optical devices.

A Decoupling and Matching Network Design for Dual-Band Two-Element Antenna Arrays

2021 ◽  
Author(s):  
Jinkai Li ◽  
Xiaoxi Zhang ◽  
Yaoxu Lei ◽  
Huiqing Zhai ◽  
Changyuan Liu
Keyword(s):  
Network Design ◽  
Antenna Arrays ◽  
Dual Band ◽  
Matching Network

scholarly journals Suppression of Cross-Band Scattering in Interleaved Dual-Band Cellular Base-Station Antenna Arrays

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 222486-222495
Author(s):  
Hai-Han Sun ◽  
Bevan Jones ◽  
Y. Jay Guo ◽  
Yee Hui Lee
Keyword(s):  
Antenna Arrays ◽  
Base Station ◽  
Dual Band

scholarly journals Untangling the Incoherent and Coherent Scattering Components in GNSS-R and Novel Applications

2020 ◽  
Vol 12 (7) ◽  
pp. 1208 ◽  
Author(s):  
Joan Francesc Munoz-Martin ◽  
Raul Onrubia ◽  
Daniel Pascual ◽  
Hyuk Park ◽  
Adriano Camps ◽  
...  
Keyword(s):  
Antenna Arrays ◽  
Fresnel Zone ◽  
Specular Reflection ◽  
Coherent Scattering ◽  
Global Navigation Satellite Systems ◽  
Dual Band ◽  
Total Power ◽  
Data Set ◽  
Coherent Component ◽  
Leo Satellite

As opposed to monostatic radars where incoherent backscattering dominates, in bistatic radars, such as Global Navigation Satellite Systems Reflectometry (GNSS-R), the forward scattered signals exhibit both an incoherent and a coherent component. Current models assume that either one or the other are dominant, and the calibration and geophysical parameter retrieval (e.g., wind speed, soil moisture, etc.) are developed accordingly. Even the presence of the coherent component of a GNSS reflected signal itself has been a matter of discussion in the last years. In this work, a method developed to separate the leakage of the direct signal in the reflected one is applied to a data set of GNSS-R signals collected over the ocean by the Microwave Interferometer Reflectometer (MIR) instrument, an airborne dual-band (L1/E1 and L5/E5a), multi-constellation (GPS and Galileo) GNSS-R instrument with two 19-elements antenna arrays with 4 beam-steered each. The presented results demonstrate the feasibility of the proposed technique to untangle the coherent and incoherent components from the total power waveform in GNSS reflected signals. This technique allows the processing of these components separately, which increases the calibration accuracy (as today both are mixed and processed together), allowing higher resolution applications since the spatial resolution of the coherent component is determined by the size of the first Fresnel zone (300–500 meters from a LEO satellite), and not by the size of the glistening zone (25 km from a LEO satellite). The identification of the coherent component enhances also the location of the specular reflection point by determining the peak maximum from this coherent component rather than the point of maximum derivative of the incoherent one, which is normally noisy and it is blurred by all the glistening zone contributions.

A Broadband $3\times4$ Butler Matrix and its Application in Multibeam Antenna Arrays

2019 ◽  
Vol 67 (12) ◽  
pp. 7622-7627
Author(s):  
Kai-Ran Xiang ◽  
Fu-Chang Chen ◽  
Qing-Xin Chu ◽  
Michael J. Lancaster
Keyword(s):  
Antenna Arrays ◽  
Multibeam Antenna ◽  
Butler Matrix

Multibeam Antenna Arrays

2016 ◽  
pp. 1893-1932
Author(s):  
Bybi P. Chacko ◽  
Gijo Augustin ◽  
Tayeb A. Denidni
Keyword(s):  
Antenna Arrays ◽  
Multibeam Antenna

Ka-band antenna arrays with dual-frequency and dual-polarized patch elements

2016 ◽  
Vol 8 (6) ◽  
pp. 963-972 ◽  
Author(s):  
Benjamin Rohrdantz ◽  
Thomas Jaschke ◽  
Frauke K. H. Gellersen ◽  
Anton Sieganschin ◽  
Arne F. Jacob
Keyword(s):  
Antenna Arrays ◽  
Patch Antenna ◽  
Communication Systems ◽  
Satellite Communication ◽  
Circuit Board ◽  
Dual Band ◽  
Antenna Element ◽  
Dual Frequency ◽  
Ka Band ◽  
Dual Polarized

In this contribution a dual-band, dual-polarized microstrip antenna element for array applications is presented. The patch antenna is designed to operate simultaneously at around 30 and 20 GHz, the up- and downlink frequencies of modern Ka-band satellite communication systems. The antenna is smaller than half the freespace wavelength at 30 GHz to enable its utilization as array element of dual-band ground terminals. Integrating transmitter and receiver circuits allows, in turn, for a very compact active terminal solution. To minimize production cost, the design is carried out in standard multilayer printed circuit board technology. The antenna features two distinct polarization ports suitable for either dual linear or dual circular polarization if both ports are excited in quadrature. The single antenna design process is described in detail and simulation and measurement results are presented. Finally, different arrays based on this patch antenna are evaluated by simulation and measurements.

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