scholarly journals High-Frequency Electromagnetic Field Coupling to Small Antennae in a Rectangular Resonator

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Sergey Tkachenko ◽  
Jürgen Nitsch ◽  
Moawia Al-Hamid
Keyword(s):  
Differential Equation ◽  
High Frequency ◽  
Induced Voltage ◽  
Electrically Small Antenna ◽  
Field Coupling ◽  
Small Antennas ◽  
High Frequency Electromagnetic Field ◽  
Small Antenna ◽  
Loop Antennas ◽  
Integral Differential Equation

The integral-differential equation for the current of an electrically small antenna, inside a resonator, which is induced by given sources, is approximately solved by the so-called “Method of Small Antenna,” both for dipole and loop antennas. The current induced in the antenna is evaluated using the scattering characteristics of small antennas in free space and regularized Green’s function of resonator. As example of application of the theory, a transfer function (“external field→induced voltage”) for the coupling through aperture is calculated.

Metamaterial-inspired electrically small antenna for microwave applications

2021 ◽  
pp. 146442072110114
Author(s):  
Ahmed M Tamim ◽  
Mohammad RI Faruque ◽  
Mohammad T Islam
Keyword(s):  
High Frequency ◽  
Metamaterial Structure ◽  
Electrically Small Antennas ◽  
New Approach ◽  
Electrically Small Antenna ◽  
Small Antennas ◽  
Antenna Performance ◽  
Microwave Applications ◽  
Microwave Communication ◽  
Small Antenna

Electrically small antennas are becoming more important to compete with the rising modern civilization. Hence, this study presents a new approach of electrically small antenna inspired by a metamaterial structure which creates an impact by achieving a multi-band property that can be applied for different microwave applications. A high-frequency electromagnetic simulator was utilized to design, simulate, and analyze the antenna performance. About 58% reduction was achieved due to the incorporation of the modified electric field-driven capacitor-driven metamaterial. The initial length of the antenna was 0.61λ0 × 0.58λ0 × 0.12λ0; however, after embedding metamaterial, 58% reduction was achieved and the size of the electrical length of the reduced antenna becomes 0.254λ0 × 0.207λ0 × 0.013λ0, where λ0 denotes free-space wavelength. The electrical limitation factor (ka) of the antenna that was 0.94 (below 1) satisfied the conditions of electrically small antenna. The antenna achieved the highest measured gain of 4.79 dB. Due to its compact miniaturized size and resonance characteristics, the proposed antenna is compatible for broad spectrum of applications in the field of microwave communication.

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