On the suppression of radiation nulls and broadband impedance matching of rectangular waveguide phased arrays

1971 ◽  
Vol 19 (1) ◽  
pp. 41-51 ◽  
Author(s):  
Shung-Wu Lee ◽  
W. Jones
Keyword(s):  
Rectangular Waveguide ◽  
Phased Arrays ◽  
Impedance Matching

A Novel Impedance Matching Approach with Oblique Waveguide for Arbitary Rectangular Waveguide Devices

2021 ◽  
Author(s):  
Qinghe Zhuang ◽  
Zhicheng Luo ◽  
Min Liu ◽  
Guang Yang ◽  
Yunling Miao ◽  
...  
Keyword(s):  
Rectangular Waveguide ◽  
Impedance Matching ◽  
Waveguide Devices

A wideband right-angle transition between thin substrate integrated waveguide and rectangular waveguide based on multi-section structure

2015 ◽  
Vol 8 (2) ◽  
pp. 185-191 ◽  
Author(s):  
Teng Li ◽  
Wenbin Dou
Keyword(s):  
Insertion Loss ◽  
Rectangular Waveguide ◽  
Return Loss ◽  
Impedance Matching ◽  
Experimental Results ◽  
Center Frequency ◽  
Substrate Integrated Waveguide ◽  
Rectangular Aperture ◽  
Section Structure ◽  
Better Than

In this paper, a novel wideband right-angle transition between thin substrate integrated waveguide (SIW) and rectangular waveguide (RWG) based on multi-section structure operating at center frequency 31.5 GHz is presented. A multi-section SIW with a rectangular aperture etched on the broad wall and two stepped ridges embedded in the RWG flange are introduced to obtain a wide impedance matching. The simulations show that the bandwidth with return loss better than 20 dB is about 17 GHz. In order to verify our designs, two back-to-back transitions with different lengths are fabricated and measured. The experimental results agree well with simulations. The proposed component shows an insertion loss less than 0.44 dB and a return loss better than 14.5 dB over 12.15 GH, which corresponds to 38.57% bandwidth.

scholarly journals DIAMAGNETO-DIELECTRIC ANISOTROPIC WIDE ANGLE IMPEDANCE MATCHING LAYERS FOR ACTIVE PHASED ARRAYS

2016 ◽  
Vol 70 ◽  
pp. 1-12 ◽  
Author(s):  
Fabrizio Silvestri ◽  
Lorenzo Cifola ◽  
Giampiero Gerini
Keyword(s):  
Phased Arrays ◽  
Impedance Matching ◽  
Wide Angle

Elimination of Scan Blindness in Rectangular Waveguide End-Slot Phased Arrays Using High-Impedance Surface

2013 ◽  
Vol 373-375 ◽  
pp. 1569-1572
Author(s):  
Lei Liu ◽  
Qiang Gao
Keyword(s):  
Surface Waves ◽  
Rectangular Waveguide ◽  
Phased Array ◽  
Phased Arrays ◽  
Ground Plane ◽  
Impédance Surface ◽  
Impedance Surface ◽  
High Impedance ◽  
High Impedance Surface

High-impedance ground plane (HIGP) is applied in the design of rectangular waveguide end-slot phased array. The benefits of using such a HIGP are related to the suppression of surface waves because of its obvious frequency bandgap and, therefore, the scan blindness could be eliminated. Both of the bandgap curve of the HIGP structure and the scan properties of the phased arrays have been calculated. The elimination of scan blindness is obtained.

Broadband, Beam-Steering Asymmetric Stacked Microstrip Phased Array with Enhanced Front-to-Back Ratio

2021 ◽  
Vol 36 (3) ◽  
pp. 273-281
Author(s):  
Melih Turk ◽  
Fikret Tokan
Keyword(s):  
Phased Array ◽  
Phased Arrays ◽  
Linear Array ◽  
Beam Steering ◽  
Impedance Matching ◽  
Base Station ◽  
Critical Problem ◽  
Backward Radiation ◽  
Broadside Radiation ◽  
Asymmetric Configuration

The backward radiation is a critical problem that may cause breakdown of the front-end circuits that are integrated behind the antenna. Thus, antennas having high Front to Back Ratio (FBR) are required. For phased arrays, the back lobe suppression is required for all scanning angles at all frequencies of the band. In this work, a stacked patch linear array with asymmetric configuration is proposed. It is capable of scanning the beam in ±40° with less than 1.34 dB scanning loss. Due to the usage of probe-fed stacked patches as the antenna elements, impedance matching in 8-10 GHz is achieved. More than 30 dB FBR is obtained for broadside radiation. It is above 20 dB when the beam is steered to θ = 40°. This is valid for all frequencies of the band. A prototype is fabricated and measured. Higher than 38 dB FBR is observed. With its broadband, high FBR and low scanning loss, the proposed asymmetrical stacked patch phased array is suitable as radar and base station antenna.

Ka Band Transition between Rectangular Waveguide and Substrate Integrated Waveguide

2012 ◽  
Vol 443-444 ◽  
pp. 362-365 ◽  
Author(s):  
Ya Zhou Dong ◽  
Shi Wei Dong ◽  
Zhong Bo Zhu ◽  
Ying Wang
Keyword(s):  
Rectangular Waveguide ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Substrate Integrated Waveguide ◽  
Low Loss ◽  
Ka Band ◽  
Ansoft Hfss ◽  
Tapered Waveguide ◽  
Band Transition ◽  
Better Than

This paper presents novel designs of Ka band transitions between standard rectangular waveguide and substrate integrated waveguide (SIW). The proposed transitions can provide simultaneous field and impedance matching. The transition with a height-tapered waveguide exhibits outstanding low-loss performance over an ultra-wideband range (entire Ka-band). And the other one with Chebyshev transformers has a compact profile and low loss better than 2dB in a bandwidth of 11GHz at Ka band. The simulation and analysis of the transitions are carried out with Ansoft HFSS.

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