scholarly journals A Novel Multiband Fractal Antenna for Wireless Application

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Lan Wang ◽  
Jianguo Yu ◽  
Tangyao Xie ◽  
Kun Bi
Keyword(s):  
Dielectric Constant ◽  
Ring Resonator ◽  
Fractal Antenna ◽  
Dielectric Plate ◽  
Fractal Method ◽  
Feeding Method ◽  
Wireless Application ◽  
Simulation Results ◽  
5 Ghz ◽  
Good Agreement

This paper proposes a novel multiband antenna using circle and triangle fractals for wireless application. By cutting a triangle slot in the circular monopole, a novel fractal method of the circular nested triangle structure is presented. The above structure is iterated four times, which forms the proposed fractal antenna. The antenna adopts the microstrip feeding method. In order to improve out band rejection and expand bandwidth, a ring resonator is designed on the back of the dielectric plate. The designed antenna covers 1.8 GHz–2.9 GHz applied to Bluetooth, TD-SCDMA, WCDMA, CDMA2000, and LTE33-41, 3.4 GHz–4.6 GHz applied to LTE 42/43 and WiMAX, and 5 GHz–5.6 GHz applied to WLAN. The substrate is FR4 with a dielectric constant of 4.4 and a loss tangent of 0.02. The size of the fabricated antenna is 87.5 × 61 × 1.6 mm. The measured pick gain achieves 2.98 dBi, 2.58 dBi, and 3.34 dBi at 2.6 GHz, 3.8 GHz, and 5.3 GHz, respectively. The measurement and simulation results are in good agreement, which verifies the rationality of the design.

Design of WLAN/WiMAX band notch super-wideband microstrip fractal antennas

2019 ◽  
Vol 11 (08) ◽  
pp. 844-850 ◽  
Author(s):  
S. S. Abdpour ◽  
N. Azadi-Tinat ◽  
H. Oraizi ◽  
J. Ghalibafan
Keyword(s):  
Ring Resonator ◽  
Measurement Data ◽  
Split Ring Resonator ◽  
Fractal Antenna ◽  
Frequency Range ◽  
Split Ring ◽  
Feed Line ◽  
Simulation Results ◽  
3D Software ◽  
Good Agreement

AbstractA super-wideband microstrip fractal antenna is designed with miniaturized dimensions of 21 mm × 23.5 mm × 1 mm and generation of dual rejection bands for WLAN/WiMAX systems has been achieved. The triangular fractal shape slots are placed inside a circular patch and the antenna is miniaturized by using a repetition frequency resonance technique. The proposed antenna frequency range 2.6–40 GHz operates for VSWR of less than 2. Two band rejections for the frequency ranges 5.1–5.8 GHz and 3.4–3.7 GHz are created by one enhanced slot at the feed line and one split-ring resonator at the back of antenna. HFSS 3D software was used for computer simulation. The proposed antenna is fabricated on the FR4 substrate with 1 mm thickness. The measurement data show good agreement with the simulation results.

scholarly journals A Low Profile Wideband Log Periodic Microstrip Antenna Design for C-Band Applications

2019 ◽  
Vol 8 (2) ◽  
pp. 48-52 ◽  
Author(s):  
M. Yerlikaya ◽  
S. S. Gültekin ◽  
D. Uzer
Keyword(s):  
Dielectric Constant ◽  
Microstrip Antenna ◽  
Microstrip Line ◽  
Ground Plane ◽  
Antenna Design ◽  
Tangent Loss ◽  
Low Profile ◽  
Measurement Results ◽  
Simulation Results ◽  
5 Ghz

In this study, a wideband low profile microstrip antenna design for C-band applications is presented. The proposed antenna consists of a monopol log periodic patch in the equilateral triangular dimensions with the microstrip line fed and a rectangular ground plane. The antenna has 9×19.8 mm2 overall size, thickness of 1.6 mm and 4.3 dielectric constant. According to the simulation results, the proposed antenna has a very wide bandwidth while operating in the frequency band of 4.25-7.95 GHz and 5 GHz resonance frequency. The proposed antenna was also prototyped on FR4 substrate with the 0.02 tangent loss and the measurement results were quite similar by the simulated results.

UWB Bandpass Filter with Ultra-wide Stopband based on Ring Resonator

Frequenz ◽  
2018 ◽  
Vol 72 (5-6) ◽  
pp. 245-252 ◽  
Author(s):  
Maryam Kazemi ◽  
Saeedeh Lotfi ◽  
Hesam Siahkamari ◽  
Mahmood Mohammadpanah
Keyword(s):  
Bandpass Filter ◽  
Ring Resonator ◽  
Ultra Wideband ◽  
Design System ◽  
Filter Performance ◽  
Full Wave ◽  
Measurement Results ◽  
Operational Frequency ◽  
Simulation Results ◽  
Good Agreement

AbstractAn ultra-wideband (UWB) bandpass filter with ultra-wide stopband based on a rectangular ring resonator is presented. The filter is designed for the operational frequency band from 4.10 GHz to 10.80 GHz with an ultra-wide stopband from 11.23 GHz to 40 GHz. The even and odd equivalent circuits are used to achieve a suitable analysis of the proposed filter performance. To verify the design and analysis, the proposed bandpass filter is simulated using full-wave EM simulator Advanced Design System and fabricated on a 20mil thick Rogers_RO4003 substrate with relative permittivity of 3.38 and a loss tangent of 0.0021. The proposed filter behavior is investigated and simulation results are in good agreement with measurement results.

scholarly journals Impact of Dielectric Constant on Embedded Antenna Efficiency

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Van Thuan Nguyen ◽  
Chang Won Jung
Keyword(s):  
Dielectric Constant ◽  
Human Body ◽  
Human Muscle ◽  
Radiation Efficiency ◽  
Liquid Environment ◽  
Antenna Efficiency ◽  
Embedded Antennas ◽  
Simulation Results ◽  
The Impact ◽  
Good Agreement

The impact of dielectric constant on radiation efficiency of embedded antenna located inside human body or another liquid environment is investigated both analytically and numerically. Our research is analysed and simulated at 403 MHz in the MedRadio band (401–406 MHz) and within a block of 2/3 human muscle phantom. Good agreement is achieved between analysis and simulation results. This work provides a guidance in selecting insulator for embedded antennas.

scholarly journals The Improved Radiations in Planar Microstrip Patch Antenna using Linear Slot Etched Ground Plane

2020 ◽  
Vol 8 (6) ◽  
pp. 123-127
Keyword(s):  
Dielectric Constant ◽  
Resonant Frequency ◽  
Patch Antenna ◽  
Ground Plane ◽  
Dominant Mode ◽  
Microstrip Patch Antenna ◽  
Microstrip Patch ◽  
Rectangular Microstrip Patch Antenna ◽  
Simulation Results ◽  
Good Agreement

Radiations improvement in a probe fed rectangular microstrip patch antenna using linear slot etched ground plane is proposed. Conventional MPA is designed using Glass Epoxy FR4 substrate. Substrate has dielectric constant 4.4 and its thickness 1.6 mm, operated at resonant frequency 3.05 GHz. The proposed method is simple and easy to etch on a substrate. This will suppress cross-polarized (XP) radiation field only without disturbing the dominant mode and co-polarized radiations. The concept has been tested using HFSS tool and verified its results experimentally. The experimental results show a good agreement with the simulation results.

scholarly journals Fractal Minkowski Antenna Loaded with Hilbert Curve as Complementary Split Ring Resonator

2015 ◽  
Vol 51 ◽  
pp. 78-86 ◽  
Author(s):  
Amer Basim Shaalan
Keyword(s):  
Ring Resonator ◽  
Split Ring Resonator ◽  
Fractal Antenna ◽  
Hilbert Curve ◽  
Split Ring ◽  
Antenna Size ◽  
Complementary Split Ring Resonator ◽  
Left Handed ◽  
Resonance Frequencies ◽  
Good Agreement

Fractal Minkowski patch antenna is proposed. Classical complementary split ring resonator (CSRR) is slotted on the patch. For comparison, fractal Hilbert shape split ring resonator also slotted on the patch. These slots make the patch behaves as a left-handed material in certain frequency band. Minkowski fractal antenna has three resonance frequencies. The complementary split ring resonator and Hilbert ring affects the upper two frequencies and make the antenna resonate at lower frequencies. Lowering the resonance frequencies cause a reduction in antenna size. More reduction of antenna size is obtained when fractal Hilbert is used as complementary split ring resonator. The simulated results have been done by using (HFSS) software, which is based on finite element modeling. The measurement of fabricated antenna shows good agreement with simulation results

Hexagonal Nested Loop Fractal Antenna for Quad Band Wireless Applications

Frequenz ◽  
2019 ◽  
Vol 73 (3-4) ◽  
pp. 99-108
Author(s):  
Robert Mark ◽  
Nipun Mishra ◽  
Kaushik Mandal ◽  
Partha Pratim Sarkar ◽  
Soma Das
Keyword(s):  
Reflection Coefficient ◽  
Low Cost ◽  
Impedance Matching ◽  
Ground Plane ◽  
Fractal Antenna ◽  
Wireless Applications ◽  
Resonant Modes ◽  
Simulation Results ◽  
Nested Loop ◽  
Good Agreement

Abstract A compact hexagonal nested loop fractal antenna with L shaped slot on the ground plane is presented for multiband applications. In this paper, the effect of fractal iterations and position of L-slot on ground plane are optimized for better performance of the antenna. Multiple hexagon loops excite multiple resonant modes at 1.7, 2.4, 3.1, 4.5 and 6 GHz and an L-shaped slot on the ground plane helps to achieve wide bandwidth response with better impedance matching in the 4.25–6.41 GHz frequency band. An equivalent circuit of the proposed antenna is modelled and the same is verified using ADS. Reflection coefficient and radiation pattern are presented to further confirm the performance of the proposed design for wireless applications. The proposed antenna is fabricated on a low-cost FR4 substrate of dimensions 40×32×1.6 mm3 and measured results show good agreement with simulation results.

scholarly journals Ultrawideband Noise Radar Tomography: Principles, Simulation, and Experimental Validation

2016 ◽  
Vol 2016 ◽  
pp. 1-21 ◽  
Author(s):  
Hee Jung Shin ◽  
Ram M. Narayanan ◽  
Mark A. Asmuth ◽  
Muralidhar Rangaswamy
Keyword(s):  
Hardware Implementation ◽  
Random Noise ◽  
Scattering Data ◽  
Tomographic Images ◽  
Tomographic Image Reconstruction ◽  
Noise Radar ◽  
Dielectric Target ◽  
Simulation Results ◽  
5 Ghz ◽  
Good Agreement

The paper introduces the principles, simulation results, and hardware implementation of ultrawideband (UWB) noise radar for obtaining tomographic images of various scenarios of rotating cylindrical objects using independent and identically distributed UWB noise waveforms. A UWB noise radar was designed to transmit multiple UWB random noise waveforms over the 3–5 GHz frequency range and to measure the backward scattering data for the validation of the theoretical analysis and numerical simulation results. The reconstructed tomographic images of the rotating cylindrical objects based on experimental results are seen to be in good agreement with the simulation results, which demonstrates the capability of UWB noise radar for complete two-dimensional tomographic image reconstruction of various shaped metallic and dielectric target objects.

scholarly journals Molecular Simulation Study of Dielectric Constants of Pure Fluids and Mixtures

2021 ◽  
Author(s):  
Maximilian Kohns
Keyword(s):  
Dielectric Constant ◽  
Dielectric Constants ◽  
Molecular Models ◽  
Liquid Equilibrium ◽  
Pure Fluids ◽  
Wide Range ◽  
Equilibrium Data ◽  
Simulation Results ◽  
Temperature And Pressure ◽  
Good Agreement

The static dielectric constant of fluids is studied with molecular models from the literature. The employed molecular models were developed using only vapor-liquid equilibrium data. No information on the dielectric properties was used, so that the simulation results are predictions. A wide range of different fluids, from slightly to strongly polar, is investigated. Most of the studied models underestimate the dielectric constant, which can be explained by the way the models were developed. For the pure fluids dimethyl ether and acetone, the temperature and pressure dependence of the dielectric constant are also studied. A good agreement with experimental data is found. Additionally, binary mixtures are investigated. Thereby, the validity of several mixing rules for the dielectric constant is assessed.

scholarly journals Wideband frequency reconfigurable metamaterial antenna employing SRR and CSRR for WLAN application

2019 ◽  
Vol 15 (3) ◽  
pp. 1436
Author(s):  
Adamu Y. Iliyasu ◽  
Mohamad Rijal Bin Hamid ◽  
Mohamad Kamal A Rahim ◽  
Mohd Fairus Bin Mohd Yusoff
Keyword(s):  
Ring Resonator ◽  
Split Ring Resonator ◽  
Pin Diode ◽  
Area Network ◽  
Split Ring ◽  
Complementary Split Ring Resonator ◽  
Metamaterial Antenna ◽  
Wireless Application ◽  
Simulation Results ◽  
Peak Gain

This paper presents the design of Wideband Frequency Reconfigurable Metamaterial Antenna by Employing Split Ring Resonator (SRR) and Complementary Split Ring Resonator (CSRR) for Wireles Area Network (WLAN) Apllication. The design is based on reconfiguring wideband metamaterial antenna by applying frequency reconfiguration technique. This was achieved by employing SRR and CSRR for bandwidth enhacement and two PIN Diode switches at different position for reconfiguration. The antenna has electrical dimention of    at 2.4 GHz. Computer Simulation Technology (CST) Software was used to determine the effectiveness of the technique. This design has several advantages like wider bandwidth which cover 2.4 GHz and 5.2 GHz WLAN bands, with three different single bands. From the simulation results, it was found that, the antenna has a bandwidth which covered 2.4 to 5.6 GHz, single bands at 2.5 GHz, 3.0 GHz and 3.5 GHz, with realized peak gain of 2.24 dBi and 3.9 dBi at 2.4 GHz and 5.2 GHz respectively and average efficiency of 96%. The antenna can be used for wireless application and cognitive radio application.

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