Radiation from dielectric-loaded arrays of parallel-plate waveguides

Lee, S.; Mittra, R.

doi:10.1109/tap.1968.1139235

Cited by 16 publications

(6 citation statements)

References 11 publications

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“…In addition, the square impedance (R s ) of the resistive sheet is also included as an optimization variable in the ECM. The resistive sheet [4] and dielectric superstrate are used for extending the impedance bandwidth and wide-angle impedance matching (WAIM) [24], [25] respectively. In addition, all the dielectric slabs can be represented by transmission lines (TLs) [26], and the characteristic impedance (Z d ) and electric length (θ d ) relate with the physical parameters (h d and ε rd ) through the following formula,…”

Section: The Proposed Design Approach and Ecms A Radiator Structmentioning

confidence: 99%

Efficient Design of Tightly Coupled Dipole Array Using an Equivalent Circuit-Based Approach

2020

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This paper proposes an efficient and systematic design approach for tightly coupled dipole array (TCDA) designs. In this approach, the radiator structure and feeding structure are designed and optimized based on their equivalent circuit models (ECM) respectively. A novel ECM is proposed to accurately describe the impedance characteristics of the radiator structure with dual-diamond dipoles. The proposed ECM of the radiator structure keeps its accuracy for variable design parameters. The ECM of the proposed feeding structure is also developed to analyze its impedance characteristics. As compared with conventional brute-force optimizations based on full-wave simulations, the two ECMs make it easy and efficient to design wideband TCDAs. A dual-polarized TCDA is designed with the proposed approach to illustrate the efficiency of the approach. The resultant TCDA operates in a wide frequency band of 0.87-10.14 GHz with VSWR≤2 for broadside radiation. Meanwhile, the VSWR value under all conditions (broadside, ±60 • scanning in E-and H-planes) remains ≤3 over the frequency band of 0.8-9 GHz. A 10 × 10 prototype is fabricated to demonstrate the design. INDEX TERMS Tightly coupled dipole array (TCDA), equivalent circuit model (ECM), phased array. I. INTRODUCTION

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Section: The Proposed Design Approach and Ecms A Radiator Structmentioning

confidence: 99%

Efficient Design of Tightly Coupled Dipole Array Using an Equivalent Circuit-Based Approach

2020

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“…Firstly, the increased scan loss due to the impedance mismatch at the aperture-air interface [3] has to be addressed appropriately. To address this problem, wide angle impedance matching (WAIM) superstrates using dielectrics [4,5] and metasurafaces (MS) [6,7] have been employed. The dielectric WAIMs increase the overall weight of the array and the chance of scan blindness.…”

Section: Introductionmentioning

confidence: 99%

A Low Profile Tightly Coupled Antenna Array with 80° Scanning for Multifunctional Applications

Bah

Bird

Qin

2019

2019 IEEE International Symposium on Phased Array System &Amp; Technology (PAST)

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A wideband wide scanning antenna array for application in multifunctional phased arrays is presented. The dipoles and balun are printed on both sides of a single RT/Duroid TM 6010 substrate with a relative dielectric constant of 10.2. Optimized designs of two thicknesses of a metasurfacebased wide angle impedance matching layer are presented, facilitating the highest figure of merit values in phased array antennas. The feed network, composed of meandered impedance transformer and balun sections, are constructed from Klopfenstein tapered microstrip lines. The overall height of the array above the ground plane is 0.087 λL, where λL is the wavelength at the lowest frequency of operation. For the single sided metasurface design, scanning to 80 o along the E-plane and 55 o along the H-plane over a 5.5:1 impedance bandwidth (0.77 GHz -4.2 GHz) was achieved assuming an active VSWR value of 3.1.

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“…In addition, the dielectric materials can be used to maintain the impedance matching for wide incident angle which is called as the wide-angle impedance matching (WAIM) 7 . The WAIM techniques have been mostly applied in planar array antennas by loading the dielectric constant sheet 7 , dielectric slab 8,9 , or frequency selective surface (FSS) 10–14 on the top of the antenna array. When the WAIM concept is applied to electromagnetic absorbers, wide incidence angle and wide bandwidth absorption can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Meta-Dome for Broadband Radar Absorbing Structure

Jeong

Nguyen

Lim

2018

Sci Rep

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This study focused on the radome and proposed an absorber with a meta-dome structure for ultra-wideband radar absorption using an FR-4 dielectric material on the metasurface absorber for protection. In addition to protecting the absorber, the metasurface absorber exhibited ultra-wideband frequency absorptivity from radar signals, with an absorptivity band from 4.6–12 GHz, including the C and X frequency bands of radar signals. A wide incidence angle should also be considered in addition to the absorption frequency band. Experimental results were obtained for all polarization angles at normal incidence for 5–14 GHz. Sensitivity to incident angle from 0° to 40° in the transverse electric mode and 0° to 60° in the transverse magnetic mode were observed. The proposed concept was demonstrated using full-wave simulation and experimental measurements.

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Radiation from dielectric-loaded arrays of parallel-plate waveguides

Cited by 16 publications

References 11 publications

Efficient Design of Tightly Coupled Dipole Array Using an Equivalent Circuit-Based Approach

Efficient Design of Tightly Coupled Dipole Array Using an Equivalent Circuit-Based Approach

A Low Profile Tightly Coupled Antenna Array with 80° Scanning for Multifunctional Applications

Meta-Dome for Broadband Radar Absorbing Structure

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