Application of Characteristic Mode Theory in HF Band Aircraft-Integrated Multiantenna System Designs

Wang, Chenghui; Chen, Yikai; Yang, Shiwen

doi:10.1109/tap.2018.2874800

Cited by 27 publications

(7 citation statements)

References 24 publications

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“…The excitation of capacitive coupling element (CCE) is achieved by adding a metal patch near the edge of the radiator, and ICE is a direct capacitive excitation [40]. In general, the corresponding mode can be resonated by ICE at the position of the maximum current distribution of the characteristic mode [41][42][43]. On the other hand, applying CCE at the position where the characteristic mode current distribution is the minimum can also make the corresponding mode resonate [44,45].…”

Section: Design Methods Of Uwb-mimo Antenna Based On Tcmmentioning

confidence: 99%

Design of a Coplanar Uwb-Mimo Ground Antenna Based on the Theory of Characteristic Modes

Tang¹,

Zhan²,

Zhong³

et al. 2021

PIER C

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A novel two-element UWB-MIMO ground antenna is designed by using the theory of characteristic modes. The proposed antenna has a simple and compact coplanar structure, which consists of a rectangular metal ground, a four-stage stepped patch, a double L-shaped patch with a corner cut, and a rectangular substrate. By analyzing the most relevant characteristic modes of the metal ground in UWB, the expected characteristic modes are excited by the capacitive coupling elements and the hybrid loading of the capacitive and inductive coupling elements, so as to reduce the size, broaden the bandwidth, and improve the isolation. The simulated and measured results show that the proposed antenna obtains ultra-wide impedance bandwidths (2.7-12.6 GHz for Port 1 and 3.0-11.0 GHz for Port 2). Furthermore, the proposed antenna also achieves high gains (3.1-7.3 dBi for Port 1 and 2.7-5.8 dBi for Port 2), stable radiation patterns, and good diversity characteristics (the minimum isolation > 16 dB, the envelope correlation coefficient < 0.01, the channel capacity loss < 0.08 bps/Hz, the total active reflection coefficient < −4.1 dB, etc.) in the whole impedance bandwidth. The research results can provide a useful reference for the design of UWB-MIMO ground antennas based on the theory of characteristic modes.

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Section: Design Methods Of Uwb-mimo Antenna Based On Tcmmentioning

confidence: 99%

Design of a Coplanar Uwb-Mimo Ground Antenna Based on the Theory of Characteristic Modes

Tang¹,

Zhan²,

Zhong³

et al. 2021

PIER C

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“…According to the analysis in Section 2.1, the induced current generated by the PTL under the excitation of the electromagnetic wave and the reradiation interference generated by it can be attributed to the electromagnetic scattering problems of the electromagnetic target. In addition, existing research shows that under a specifc excitation, only a few characteristic modes play a major role in electromagnetic scattering, so the solution to electromagnetic scattering problems can be simplifed by only considering the main characteristic modes [16]. According to the above mechanism, we can introduce the characteristic modes into the analysis of the induced current on PTL, study the inherent induced current distribution of PTL by the solution of characteristic mode currents, and analyze the main characteristic mode currents under a specifc excitation by the expansion coeffcients.…”

Section: Te Concept and Application Of Characteristic Modesmentioning

confidence: 99%

Analysis of Induced Current on Power Transmission Lines for the Reradiation Interference in Medium Wave Based on Characteristic Modes

Tang

Yang

Zhang³

et al. 2022

International Journal of Antennas and Propagation

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The reradiation interference from power transmission lines (PTL) on the adjacent wireless stations is directly caused by the induced current on metal parts, which means the interference could be suppressed by reducing the induced current. In order to effectively analyze the induced current of PTL, a method for analyzing induced current on PTL based on characteristic modes is proposed combining MoM with intrinsic modes. This method breaks through the traditional antenna resonance theory proposed by IEEE and could effectively avoid model equivalent defects and frequency limitations of traditional methods. Firstly, a generalized characteristic equation about the characteristic mode currents of PTL is constructed, and the numerical solutions of the characteristic mode currents are obtained by the idea of a discrete solution. Then, through the weighted orthogonal relationship between different characteristic mode currents, the expansion coefficients of the characteristic mode currents are obtained; finally, combined with the Poynting theorem, the physical meaning of the expansion coefficients and their related quantities are explained from the perspective of energy and the analysis of the induced current is realized from the physical level. The results of the example analysis show that the error between the peak frequencies of the induced current calculated by the method in this paper and the peak frequencies calculated by MoM does not exceed 2.46% and the method in this paper can well explain the disappearance of the “double wavelength loop resonance frequency” under the excitation of a vertically polarized plane wave.

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“…Characteristic modes are a complete set of orthogonal modes for expanding any induced currents and far fields due to a specific external source. According to the theory of characteristic modes [16], [25], the contribution of a mode current (Jn) to the total currents is characterized by the modal weighting coefficients (αn)…”

Section: A Theory Of Characteristic Modesmentioning

confidence: 99%

Miniaturized-Element Frequency-Selective Rasorber Design Using Characteristic Modes Analysis

Guo

et al. 2020

IEEE Trans. Antennas Propagat.

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A dual-polarization frequency-selective rasorber with two absorptive bands at both sides of a passband is presented. Based on the characteristic mode analysis, a circuit analog absorber is designed using a lossy FSS that consists of miniaturized meander lines and lumped resistors. The positions and values of resistors are determined according to the analysis of modal significances and modal current. After that, the presented rasorber is designed by cascading of the lossy FSS and a lossless bandpass FSS. Equivalent circuits of the frequency-selective rasorber are modelled, and surface current distributions of both FSSs are illustrated to explain the operation mechanism. Measurement results show that, under the normal incidence, a minimum insertion loss of 0.27 dB is achieved at a passband around 6 GHz, and the absorption bands with an absorption rate higher than 80% are 2.5 to 4.6 GHz in the lower band and 7.7 to 12 GHz in the higher band, respectively. Our results exhibit good agreements between measurements and simulations.

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Application of Characteristic Mode Theory in HF Band Aircraft-Integrated Multiantenna System Designs

Cited by 27 publications

References 24 publications

Design of a Coplanar Uwb-Mimo Ground Antenna Based on the Theory of Characteristic Modes

Design of a Coplanar Uwb-Mimo Ground Antenna Based on the Theory of Characteristic Modes

Analysis of Induced Current on Power Transmission Lines for the Reradiation Interference in Medium Wave Based on Characteristic Modes

Miniaturized-Element Frequency-Selective Rasorber Design Using Characteristic Modes Analysis

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