scholarly journals FREQUENCY MODULATION APPROACH BASED ON SPLIT-RING RESONATOR LOADED BY VARACTOR DIODE

2020 ◽  
Vol 10 (3) ◽  
pp. 74-77
Author(s):  
Dmytro Vovchuk ◽  
Serhii Haliuk ◽  
Pavlo Robulets ◽  
Leonid Politanskyi
Keyword(s):  
Bias Voltage ◽  
Frequency Modulation ◽  
Ring Resonator ◽  
Low Cost ◽  
Near Field ◽  
Magnetic Loop ◽  
Split Ring Resonator ◽  
Split Ring ◽  
Suggested Approach ◽  
Varactor Diode

In the paper, an approach to frequency modulation is presented using a split-ring resonator (SRR) loaded by a varactor diode. The modulation occurs due to the continuous time variation of capacitance of the varactor diode via changing of its bias voltage by the signal which is necessary to modulate. The modulation signal is used for bias voltage. As a source of a carrier signal, one more extra magnetic loop antenna is utilized which is coupled with the SRR via near-field interaction. Investigation of two types of signals (harmonic and chaotic) was performed for modulation in the paper. It is shown that it is possibile to provide the frequency modulation with deviation Δfd = ±80 MHz which covers the frequency range 0.95…1.11 GHz for a 1 GHz carrier signal when a SMV1231 varactor diode is used. The major advantages of the suggested approach are the very simple design and ability to easily define the required values of frequency deviation through tuning of the bias voltage magnitude range of the varactor diode. Therefore, the presented investigation and results can be useful in the manufacturing of low-cost radio components.

Design and Fabrication of 3D Printed Reconfigurable Metamaterial-inspired Structures

2019 ◽  
Vol 2019 (1) ◽  
pp. 000595-000598
Author(s):  
Saranraj Karuppuswami ◽  
Avi Rajendra-Nicolucci ◽  
Saikat Mondal ◽  
Mohd Ifwat Mohd Ghazali ◽  
Premjeet Chahal
Keyword(s):  
High Temperature ◽  
Small Volume ◽  
Ring Resonator ◽  
Low Cost ◽  
Microfluidic Channel ◽  
Split Ring Resonator ◽  
Split Ring ◽  
Liquid Samples ◽  
Volatile Organic ◽  
3D Printed

Abstract In this paper, 3D printing is used as an alternative manufacturing technique to fabricate metamaterial-inspired RF structures for liquid profiling. A dual split-ring resonator (SRR) based sensor tag is designed and integrated with a microfluidic channel for detecting different liquid samples. The sensor is 3D printed using a high-temperature resin and metallized using a custom developed metal patterning process. The sensor requires a very small volume of 8.6 μL of sample under test for detection. The resonance frequency of the SRR changes with change in sample loading and the shift is monitored for sample profiling. Different volatile organic compounds are introduced and the shift is monitored demonstrating the sensitivity of the proposed tag. The low-cost, real-time nature of the tag makes it an ideal choice for monitoring liquids along the supply chain.

scholarly journals Efficient and Compact Near-Field Coupled Hybrid Antenna Using a Single Radiating Subwavelength Split-Ring Resonator

Electronics ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 527
Author(s):  
Zinching Dang ◽  
Marco Rahm
Keyword(s):  
Resonance Frequency ◽  
Electromagnetic Waves ◽  
Ring Resonator ◽  
Near Field ◽  
Low Frequency ◽  
Split Ring Resonator ◽  
Dipole Antenna ◽  
Angular Width ◽  
Split Ring ◽  
Broadband Internet

Modern applications in the realms of wireless communication and mobile broadband Internet increase the demand for compact antennas with well defined directivity. Here, we present an approach for the design and implementation of hybrid antennas consisting of a classic feeding antenna that is near-field-coupled to a subwavelength resonator. In such a combined structure, the composite antenna always radiates at the resonance frequency of the subwavelength oscillator as well as at the resonance frequency of the feeding antenna. While the classic antenna serves as impedance-matched feeding element, the subwavelength resonator induces an additional resonance to the composite antenna. In general, these near-field coupled structures are known for decades and are lately published as near-field resonant parasitic antennas. We describe an antenna design consisting of a high-frequency electric dipole antenna at f d = 25 GHz that couples to a low-frequency subwavelength split-ring resonator, which emits electromagnetic waves at f SRR = 10.41 GHz. The radiating part of the antenna has a size of approximately 3.2 mm × 8 mm × 1 mm and thus is electrically small at this frequency with a product k · a = 0.5 . The input return loss of the antenna was moderate at − 18 dB and it radiated at a spectral bandwidth of 120 MHz. The measured main lobe of the antenna was observed at 60 ∘ with a − 3 dB angular width of 65 ∘ in the E-plane and at 130 ∘ with a − 3 dB angular width of 145 ∘ in the H-plane.

scholarly journals Near-field terahertz imaging of a discontinuity in split ring resonator array

2013 ◽  
Vol 41 ◽  
pp. 09006
Author(s):  
F. Blanchard ◽  
K. Ooi ◽  
T. Tanaka ◽  
A. Doi ◽  
K. Tanaka
Keyword(s):  
Ring Resonator ◽  
Near Field ◽  
Split Ring Resonator ◽  
Terahertz Imaging ◽  
Split Ring

scholarly journals A Metamaterial Backed Dipole Antenna for High Gain Directional Communications

2016 ◽  
Vol 5 (1) ◽  
pp. 9
Author(s):  
V. P. Sarin ◽  
M. P. Jayakrishnan ◽  
C. K. Aanandan ◽  
M. Pezholil ◽  
V. Kesavath
Keyword(s):  
Dielectric Constant ◽  
Ring Resonator ◽  
Low Cost ◽  
High Gain ◽  
Split Ring Resonator ◽  
Dipole Antenna ◽  
Metamaterial Structure ◽  
Split Ring ◽  
Reflection Phase ◽  
Continuous Wire

The enhanced radiation performance of a dipole antenna backed by the split ring resonator-continuous wire pair array working in the H┴ excitation scenario is presented in this paper.  The H┴ excitation scenario of the metamaterial is used to get zero reflection phase resulting in enhanced gain performance. The two layer meta-structure along with the dipole is fabricated on a low cost substrate of dielectric constant 4.4 and height 1mm. The reflection properties of the metamaterial structure and its effect on the radiation performance of the dipole antenna are presented in this paper.

scholarly journals Tunable Elliptical Split Ring Resonator Using Single Varactor Diode

2018 ◽  
Vol 7 (1) ◽  
pp. 7-12 ◽  
Author(s):  
A. S. Elkorany ◽  
G. Ahmed ◽  
D. Saleeb ◽  
H. A. Mohamed
Keyword(s):  
Finite Element Method ◽  
Resonant Frequency ◽  
Ring Resonator ◽  
Split Ring Resonator ◽  
Single Variable ◽  
Split Ring ◽  
Varactor Diode ◽  
Maximum Value ◽  
Frequency Tunability ◽  
Metallic Rings

In this paper, the effect of changing the structure of split ring resonator SRR from circular to elliptical shape is presented and tested. The theoretical analysis of circular SRR (CSRR) is tested and its results are compared with the simulated ones. Comparison between both configurations is introduced. The new elliptical SRR (ESRR) can be adapted to operate in multi range of frequencies. The effect of gap position in ESRR resonant is also examined. When both gaps are moved but still aligned, the resonant frequency still the same. But when single gap is moved only the resonant frequency the resonant frequency in changed to reach its maximum value when both gaps are in the same position. Frequency tunability can be offered by loading a single variable capacitor between ESRR metallic rings.  The resonant frequency of the ESRR can be controlled by varying the capacitance of the varactor diode. Finite element method FEM is used to simulate the proposed structures using HFSS.

scholarly journals Shield Optimization and Formulation of Regression Equations for Split-Ring Resonator

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Tahir Ejaz ◽  
Hamood Ur Rahman ◽  
T. Tauqeer ◽  
Adnan Masood ◽  
Tahir Zaidi
Keyword(s):  
Resonant Frequency ◽  
Quality Factor ◽  
Ring Resonator ◽  
Low Cost ◽  
Split Ring Resonator ◽  
Ring Resonators ◽  
Regression Equations ◽  
Split Ring ◽  
Optimum Result ◽  
5 Ghz

Microwave resonators are widely used for numerous applications including communication, biomedical and chemical applications, material testing, and food grading. Split-ring resonators in both planar and nonplanar forms are a simple structure which has been in use for several decades. This type of resonator is characterized with low cost, ease of fabrication, moderate quality factor, low external noise interference, high stability, and so forth. Due to these attractive features and ease in handling, nonplanar form of structure has been utilized for material characterization in 1–5 GHz range. Resonant frequency and quality factor are two important parameters for determination of material properties utilizing perturbation theory. Shield made of conducting material is utilized to enclose split-ring resonator which enhances quality factor. This work presents a novel technique to develop shield around a predesigned nonplanar split-ring resonator to yield optimized quality factor. Based on this technique and statistical analysis regression equations have also been formulated for resonant frequency and quality factor which is a major outcome of this work. These equations quantify dependence of output parameters on various factors of shield made of different materials. Such analysis is instrumental in development of devices/designs where improved/optimum result is required.

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