scholarly journals W-Band Hybrid Unequal Feeding Network of Waveguide and Substrate Integrated Waveguide for High Efficiency and Low Sidelobe Level Slot Array Antenna Application

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Jun Wang ◽  
Yu Jian Cheng
Keyword(s):  
Antenna Arrays ◽  
High Efficiency ◽  
Phase Distribution ◽  
Substrate Integrated Waveguide ◽  
Low Loss ◽  
Sidelobe Level ◽  
Vertical Transition ◽  
W Band ◽  
Low Sidelobe ◽  
Hybrid Waveguide

A W-band hybrid unequal feeding network of waveguide and substrate integrated waveguide (SIW) is presented in this paper. It comprises a two-way hybrid waveguide-SIW E-plane divider and an unequal SIW dividing network. Firstly, the two-way hybrid divider is developed to realize the waveguide-to-SIW vertical transition and power division at the same time. Besides, it has a wider bandwidth and more compact configuration compared with those of conventional structures including a transition and a cascading divider. Secondly, an SIW 1-to-16-way unequal dividing network is developed with the phase self-compensation ability. This W-band dividing network is able to generate the desired amplitude and phase distribution. Finally, two back-to-back SIW 16 × 16 antenna arrays are grouped and fed by the proposed feeding network. The low sidelobe levels (SLLs) can be achieved at E- and H-plane of the antenna. The total aperture size of the antenna is 15% less than that of a conventional antenna with a separated divider and a transition. With such a multifunctional feeding network, the antenna is able to achieve low loss and high efficiency as well.

Broadband Transition between Substrate Integrated Waveguide (SIW) and Rectangular Waveguide for Millimeter-Wave Applications

2011 ◽  
Vol 130-134 ◽  
pp. 1990-1993 ◽  
Author(s):  
Kuang Da Wang ◽  
Wei Hong ◽  
Ke Wu
Keyword(s):  
Millimeter Wave ◽  
Rectangular Waveguide ◽  
Return Loss ◽  
Substrate Integrated Waveguide ◽  
Full Wave ◽  
Vertical Transition ◽  
W Band ◽  
Relative Bandwidth ◽  
Is Design ◽  
Better Than

In this paper, a broadband and simple vertical transition between substrate integrated waveguide and standard air-filled rectangular waveguide is design and experimentally verified. From full-wave simulation of the structure, a relative bandwidth of 19.5% in W-band with return loss better than 20dB is reached. Then, five copies of back-to-back connected transitions are fabricated on RT/Duroid 5880 substrate. The experimental results show that the transition pairs have an average of 15% relative bandwidth with return loss better than 12dB and insert loss lower than 1.2dB. To explain the differences between simulated and tested results, an error analysis is presented.

scholarly journals Circularly Polarized Dielectric Resonator Antenna Arrays with Fractal Cross-Slot-Coupled DRA Elements

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Jia-Hong Lin ◽  
Wen-Hui Shen ◽  
Zhi-Dong Shi ◽  
Shun-Shi Zhong
Keyword(s):  
Antenna Arrays ◽  
Dielectric Resonator ◽  
Design Procedure ◽  
Axial Ratio ◽  
Array Element ◽  
Dielectric Resonator Antenna ◽  
Sidelobe Level ◽  
Circularly Polarized ◽  
Low Sidelobe

In the design of circularly polarized (CP) dielectric resonator antenna (DRA) arrays, the regular-shaped DRAs with simple feeding configurations are mostly used as array elements to make the design procedure more efficient. However, such array element DRA usually achieves only about 6% axial ratio (AR) bandwidth. In this paper, a CP DRA element coupled by a fractal cross-slot which can radiate efficiently and excite the rectangular DRA simultaneously is considered. By adjusting the dimensions of the fractal cross-slot properly, the resonances of the fractal cross-slot and the dielectric resonator can be merged to obtain a wider AR bandwidth. Based on the proposed fractal cross-slot-coupled CP DRA element, two different CP DRA arrays are designed: a wideband CP DRA array and a low-sidelobe-level (SLL) CP DRA array. The designed DRA arrays are fabricated and measured, and structures and performances of the arrays are presented and discussed.

scholarly journals Features of excitation reconstruction in flat multielement phased antenna array face using dynamic directional patterns

2017 ◽  
pp. 32-39
Author(s):  
S. E. Gavrilova ◽  
A. N. Gribanov ◽  
G. F. Moseychuk ◽  
A. I. Sinani
Keyword(s):  
Antenna Arrays ◽  
High Efficiency ◽  
Phase Distribution ◽  
Radiation Patterns ◽  
Phased Array Antennas ◽  
Phased Antenna Arrays ◽  
Phased Antenna Array ◽  
Transformation Algorithms ◽  
Computational Resources ◽  
Research Show

The study focuses on reconstructing the amplitude-phase distribution of flat multielement passive and active phased antenna arrays with the use of dynamic radiation patterns, measured with electronical scanning without mechanical rotations and antenna movements. The paper describes the measurement settings of dynamic radiation patterns, necessary for reconstructing the amplitude-phase distribution. Findings of the research show that to reconstruct the amplitude-phase distribution according to dynamic radiation diagrams, there is no need for increased computational resources due to the use of Fourier transformation algorithms. After the method was experimentally verified on the specific samples of active phased antenna arrays, its high efficiency was established. The paper gives the examples of reconstructing the amplitude-phase distribution from dynamic radiation patterns in the presence of malfunctions in active phased array antennas.

scholarly journals Synthesis of low sidelobe level antenna arrays through only main lobe assumption

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mohammad Khalaj-Amirhosseini
Keyword(s):  
Antenna Arrays ◽  
Main Lobe ◽  
Analytic Method ◽  
Sidelobe Level ◽  
Low Sidelobe ◽  
The Ideal

AbstractAn analytic method is proposed to design uniformly spaced arrays so that have as low as possible sidelobe level and having directivity as close as to that of uniformly excited arrays. The ideal array factor of arrays is assumed to have only one main lobe. The actual synthesized array would have sidelobe levels which can be controlled by a parameter. Some examples are given to verify the effectiveness of the presented method.

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