Compact Triple Band Metamaterial Antenna Based on Modified Electric-field Coupled-LC Resonator

2014 ◽  
Vol 70 (1) ◽  
Author(s):  
B. D. Bala ◽  
M. K. A. Rahim ◽  
N. A. Murad ◽  
M. H. Mokhtar
Keyword(s):  
Electric Field ◽  
Magnetic Moments ◽  
Capacitive Coupling ◽  
Structural Modifications ◽  
Unit Cell Size ◽  
Metamaterial Antenna ◽  
Resonance Frequencies ◽  
Lc Resonator ◽  
Strip Lines ◽  
Triple Band

In this paper, a compact triple band metamaterial antenna based on modified electric-field coupled (ELC) resonator is presented. The modification to the conventional ELC is achieved by the use of strip lines to enhance the capacitive coupling of the capacitive gaps and a stub printed at the back of the resonator. The unit cell’s macroscopic parameters were not affected by the structural modifications as the electric moment dominates the magnetic moments in the ELC response. By employing this structure, three resonance frequencies at 1.65 GHz, 3.5 GHz and 5.8 GHz are obtained. The overall size of the antenna is 40 mm × 45 mm (0.22λo × 0.24λo) with the unit cell size of 12 mm × 11 mm (0.066λo × 0.060λo) at 1.65 GHz. The peak gain of 2.10 dBi and radiation efficiency of 97% is obtained at 5.8 GHz. The proposed antenna has advantages of being compact, small and suitable for WiMAX (3.5 GHz) and WLAN (5.8 GHz) applications. The simulated and measured return losses and the radiation patterns are presented and compared.  

scholarly journals Analysis and design of a triple band metamaterial simplified CRLH cells loaded monopole antenna

2016 ◽  
Vol 9 (4) ◽  
pp. 903-913 ◽  
Author(s):  
Mahmoud Abdelrahman Abdalla ◽  
Zhirun Hu ◽  
Cahyo Muvianto
Keyword(s):  
Simple Structure ◽  
Monopole Antenna ◽  
Proof Of Concept ◽  
Analysis And Design ◽  
Design Procedures ◽  
Left Handed ◽  
Full Wave ◽  
Compact Size ◽  
Resonance Frequencies ◽  
Triple Band

The design and analysis of meta-material inspired loaded monopole antenna for multiband operation are reported. The proposed antenna consists of multi resonators inspired from half mode composite right/left handed cells, which has a simple structure, compact size, and provides multiband functionalities. As a proof of concept, a triple band antenna covering all possible WiMAX operating bands, has been designed, fabricated, and characterized. The hosting monopole patch itself generates resonance for 3.3–3.8 GHz band, whereas the loaded metamaterial cells add extra resonance frequencies. The loading of two resonator cells introduces two extra resonances for 2.5–2.7 GHz and 5.3–5.9 GHz bands, respectively. The antenna's operating principle and design procedures with the aid of electromagnetic full wave simulation and experimental measurements are presented. The antenna has good omnidirectional patterns at all three bands. The monopole patch size is 13.5 × 6.5 mm2and the whole antenna size (including the feed line) is 35 × 32 mm2. Compared with conventional single band microstrip patch radiator, the radiator size of this antenna is only 8.5% at 2.5 GHz, 17% at 3.5 GHz, and 37% at 5.5 GHz.

Frequency Reconfigurable Epsilon Negative Metamaterial Antenna

2017 ◽  
Vol 7 (3) ◽  
pp. 1473
Author(s):  
Arrauzah Razak ◽  
M. K. A. Rahim ◽  
H. A. Majid ◽  
N. A. Murad
Keyword(s):  
Electric Field ◽  
Resonance Frequency ◽  
Software Tool ◽  
Unit Cell ◽  
Reconfigurable Antenna ◽  
Circular Shape ◽  
At Resonance ◽  
Metamaterial Antenna ◽  
Frequency Reconfigurable Antenna ◽  
Radius Size

This paper proposes metamaterial (MTM) inspired frequency reconfigurable antenna based on thecircular electric field coupled (ELC) resonator. It is composed of circular shape ELC resonator with the radius size of 7 mm. By inserting two switches between the gaps at both side of the circular ELC resonator, it is possible to switch ON or OFF the unit cell. The antenna has been simulated using CST Microwave Studio software tool. The simulation result shows that the proposed antenna is capable of reconfiguring between two different frequencies which are2.18 GHz and 2.64 GHz. The simulated bandwidth at -10 dB is 4.12 % at resonance frequency of 2.18 GHz and 8.7% at 2.64 GHz

Parametric Investigation and Analysis of an Electric-LC Resonator by Using LC Circuit Model

2020 ◽  
Vol 35 (10) ◽  
pp. 1113-1118
Author(s):  
Han Xiong ◽  
Xiu-Ming Li
Keyword(s):  
Theoretical Calculations ◽  
Normal Incidence ◽  
Circuit Model ◽  
Critical Parameters ◽  
Left Hand ◽  
Resonance Frequencies ◽  
Lc Circuit ◽  
Lc Resonator ◽  
Specific Frequency ◽  
Lc Resonators

Electric-LC resonators (ELCs) metamaterials, as a kind of common structures, have been extensively investigated from microwave to terahertz frequencies. In this paper, we present a LC circuit model to analyze electric-LC resonator. With the reliable and closed formulas of the effective inductance and capacitance, the expressions of electric and magnetic resonance frequencies were obtained, which is suitable to discuss the resonance characteristic under the normal incidence case. Meanwhile, the mutual relationships among the permittivity, permeability, refractive index, and structure parameters can be explored by using the obtained expressions. Numerical simulations and theoretical calculations reveal that the width and length of the gaps are some of the critical parameters determining the resonator frequency of the example metamaterial. This study provides valuable information for designing the desired left-hand metamaterial at some specific frequency points.

SECOND ORDER NUCLEAR QUADRUPOLE EFFECTS IN SINGLE CRYSTALS: PART I. THEORETICAL

1953 ◽  
Vol 31 (5) ◽  
pp. 820-836 ◽  
Author(s):  
G. M. Volkoff
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Single Crystals ◽  
Electric Quadrupole ◽  
Second Order ◽  
Order Effects ◽  
Axially Symmetric ◽  
Crystalline Electric Field ◽  
Resonance Frequencies ◽  
Principal Axes

The dependence of electric quadrupole splitting of nuclear magnetic resonance absorption lines in single crystals on crystal orientation in an external magnetic field is investigated theoretically following earlier work of Pound, of Volkoff, Petch, and Smellie, and of Bersohn. Explicit formulae are given, applicable to non axially symmetric crystalline electric field gradients (η ≠ 0), and valid up to terms of the second order in the quadrupole coupling constant [Formula: see text], for the dependence of the absorption frequencies on the angle of rotation of the crystal about any arbitrary axis perpendicular to the magnetic field. Some formulae including third order effects in Cz are also given. It is shown that an experimental study of the dependence of this splitting on the angles of rotation about any two arbitrary mutually perpendicular axes is sufficient, when second order effects are measurable, to yield the values of | Cz |, η, and the orientation of the principal axes of the electric field gradient tensor at the nuclear sites. In the case that the direction of one of the principal axes is known from crystal symmetry, a single rotation about this axis gives the complete information.A new method of determining nuclear spin I is proposed which depends on comparing first and second order shifts of the resonance frequencies of the strong inner line components. The method will be of interest in those cases where the total number 2I of line components can not be unambiguously ascertained owing to the outer line components being excessively broadened and weakened by crystal imperfections.

39K, 40K and 41K Nuclear Magnetic Resonance Studies

1974 ◽  
Vol 29 (12) ◽  
pp. 1754-1762 ◽  
Author(s):  
W. Sahm ◽  
A. Schwenk
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Moments ◽  
Relaxation Times ◽  
Isotopic Effect ◽  
Water Molecules ◽  
Potassium Salts ◽  
Rare Isotope ◽  
Resonance Frequencies ◽  
First Time ◽  
Limits Of Error

The NMR lines of 39K and 41K have been investigated in solutions of many potassium salts in H2O, D2O, methanol and ethylenediamine and also in solid potassium halides. The NMR signal of the rare isotope 40K was detected for the first time. The ratio of the Larmor frequencies of 39K and 41K has been measured in various samples: υ(30K)/υ(41K) =1.821873 1 (9). No primary isotopic effect was to be detected within these limits of error (0.5 ppm). The concentration dependence of the chemical shift of the 39K resonance frequencies was determined. Using this dependence, the ratios of the Larmor frequencies of the nuclei 39K, 40K, and 41K for infinite dilution relative to the resonance frequency of 2H in D2O are given. The magnetic moments of the 39K+, 40K+, and 41K+ ions purely surrounded by water molecules are μ(39K+) =0.390 952 9 (24)μN, μ(40K+) = -1.296 262(9)μN , μ(41K+) =0.214 588 4 (13) μN without diamagnetic corrections. Comparison of these values with the results of atomic beam magnetic resonance experiments yields the hyperfine structure anomalies of all pairs of potassium isotopes and also the shielding of potassium nuclei by water molecules around the ions; the shielding constant is σ* (K+ in H2O vs. K atom) = - 0.000 105 2(8). For the liquid samples the relaxation times T2 and for the solid ones the relaxation times T2 and the line widths are given.

Time-Averaged Electric Field Profiles in a Capacitive Coupling Parallel Plate Electrode RF Discharge Helium Plasma

1990 ◽  
Vol 29 (Part 1, No. 11) ◽  
pp. 2497-2498 ◽  
Author(s):  
Teruo Kaneda ◽  
Tadahiro Kubota ◽  
Mikio Ohuchi ◽  
Jen-Shih Chang
Keyword(s):  
Electric Field ◽  
Parallel Plate ◽  
Capacitive Coupling ◽  
Rf Discharge ◽  
Helium Plasma ◽  
Plate Electrode
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