scholarly journals UWB Single Port Log Periodic Toothed Terahertz Antenna Design Based on Graphene Artificial Magnetic Conductor

2017 ◽  
Vol 11 (3) ◽  
pp. 86 ◽  
Author(s):  
Hussein A. Abdulnabi ◽  
Refat T. Hussein ◽  
Raad S. Fyath
Keyword(s):  
Chemical Potential ◽  
Single Port ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Antenna Design ◽  
Frequency Range ◽  
Magnetic Conductor ◽  
Dc Voltage ◽  
Artificial Magnetic Conductor ◽  
Log Periodic Antenna

In this work, a single port exponential tapered toothed log periodic antenna based on graphene artificial magnetic conductor (AMC) is suggested for ultra-wideband (1–10) THz operation. The resonance frequency of the proposed antenna can be tuned by changing the connected DC voltage which leads to variation in the chemical potential of the graphene.The radiating toothed log periodic antenna consists of gold patch placed on 25x25 graphene patches which act as an AMC surface unit. Exponential taper is used to satisfy impedance matching between the antenna and the feeder over the frequency range. The simulation results reveal that 90% of frequency range satisfies when the chemical potential is1eV.

Flexible and moon-shaped slot UWB implantable antenna design for head implants

2017 ◽  
Vol 9 (8) ◽  
pp. 1559-1567 ◽  
Author(s):  
Roshanak Elyassi ◽  
Gholamreza Moradi
Keyword(s):  
Flexible Substrate ◽  
Impedance Matching ◽  
Human Head ◽  
Mean Value ◽  
Ultra Wideband ◽  
Antenna Design ◽  
Frequency Range ◽  
Antenna Performance ◽  
Implantable Antenna ◽  
Simulation Results

In this paper, we present a novel flexible moon-shaped slot implantable antenna for neural recording systems and head implants. It covers both medical Industrial, Scientific and Medical band (2.45 GHz) and impulse ratio ultra-wideband (IR-UWB) frequency range (3.1–10.6 GHz) for forward and backward telemetry applications. It has a simple and miniaturized structure in comparison with the antennas reported in the other researches. Furthermore, for adapting with natural curvature of human head, a flexible substrate is chosen with a good antenna performance under the bending. The proposed antenna is analyzed in a multi-layer box model of head tissues to speed up the antenna design procedures. On the basis of the simulation results, we achieved the good impedance matching over the desired frequency range (S11below −10 dB). Far-field characteristics are considered, as well. The directivity is in suitable range for UWB short-range communications and its mean value is 3.84 dBi. Finally, to take into account patents’ safety regulations and the effective isotropic radiated power restriction in the desired frequency range, the maximum power of transmitter has been calculated. A phantom containing a mixture of sugar and water is used to test the fabricated antenna. The measured parameters are well matched to the full-wave simulation results.

Ultra‐wideband circularly polarized crossed‐dual‐arm bowtie dipole antenna backed by an artificial magnetic conductor

2019 ◽  
Vol 61 (12) ◽  
pp. 2801-2810
Author(s):  
Mohamed Elsaid ◽  
Korany R. Mahmoud ◽  
Mohamed Hussein ◽  
Mohamed F. O. Hameed ◽  
Ashraf Yahia ◽  
...  
Keyword(s):  
Dipole Antenna ◽  
Ultra Wideband ◽  
Magnetic Conductor ◽  
Circularly Polarized ◽  
Artificial Magnetic Conductor ◽  
Dual Arm

Design and modeling of an ultra-wideband low-noise distributed amplifier in InP DHBT technology

2019 ◽  
Vol 11 (7) ◽  
pp. 635-644 ◽  
Author(s):  
T. Shivan ◽  
E. Kaule ◽  
M. Hossain ◽  
R. Doerner ◽  
T. Johansen ◽  
...  
Keyword(s):  
Noise Figure ◽  
Impedance Matching ◽  
Low Noise ◽  
Ultra Wideband ◽  
Frequency Range ◽  
Collector Current ◽  
Noise Sources ◽  
Distributed Amplifier ◽  
Double Heterojunction ◽  
High Bandwidth

AbstractThis paper reports on an ultra-wideband low-noise distributed amplifier (LNDA) in a transferred-substrate InP double heterojunction bipolar transistor (DHBT) technology which exhibits a uniform low-noise characteristic over a large frequency range. To obtain very high bandwidth, a distributed architecture has been chosen with cascode unit gain cells. Each unit cell consists of two cascode-connected transistors with 500 nm emitter length and ft/fmax of ~360/492 GHz, respectively. Due to optimum line-impedance matching, low common-base transistor capacitance, and low collector-current operation, the circuit exhibits a low-noise figure (NF) over a broad frequency range. A 3-dB bandwidth from 40 to 185 GHz is measured, with an NF of 8 dB within the frequency range between 75 and 105 GHz. Moreover, this circuit demonstrates the widest 3-dB bandwidth operation among all reported single-stage amplifiers with a cascode configuration. Additionally, this work has proposed that the noise sources of the InP DHBTs are largely uncorrelated. As a result, a reliable prediction can be done for the NF of ultra-wideband circuits beyond the frequency range of the measurement equipment.

scholarly journals Millimeter Wave on Chip Antenna Using Dogbone Shape Artificial Magnetic Conductor

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Guo Qing Luo ◽  
Zheng Zheng Song ◽  
Xiao Hong Zhang ◽  
Xiao Ping Hu
Keyword(s):  
Millimeter Wave ◽  
Metal Layer ◽  
Cmos Technology ◽  
Dipole Antenna ◽  
Antenna Design ◽  
Magnetic Conductor ◽  
Artificial Magnetic Conductor ◽  
On Chip Antenna ◽  
Enhance Efficiency ◽  
On Chip

An artificial magnetic conductor (AMC) applied in millimeter wave on chip antenna design based on a standard 0.18 μm CMOS technology is studied. The AMC consisting of two-dimensional periodic dogbone shape elements is constructed at one metal layer of the CMOS structure. After its performance has been completely investigated, it has been used in an on chip dipole antenna design as an artificial background to enhance efficiency of the dipole antenna. The result shows that 0.72 dB gain has been achieved at 75 GHz when the AMC is constructed by a 4*6 dogbone array.

scholarly journals Design of Tunable Monopole Arm Planar Spiral Antenna for Cognitive Radio

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Rahul Yadav
Keyword(s):  
Cognitive Radio ◽  
Frequency Tuning ◽  
Impedance Matching ◽  
Ground Plane ◽  
Excitation Frequency ◽  
Antenna Design ◽  
Frequency Range ◽  
Spiral Antenna ◽  
Front End ◽  
Quarter Wavelength

This paper presents a spiral antenna design operating in the frequency range of 1–15 GHz having both selective notch bands and wideband response. The main feed arm of spiral antenna is configured as rectangular monopole of width quarter wavelength to achieve impedance matching with standard 50 Ω excitation. Frequency tuning in the design is achieved by placing varactor diode at an appropriate position along the spiral arms and in the ground plane. The design offers a peak gain of 3.4 dB (simulated) and 3 dB (measured). The unique frequency response of antenna makes its suitable to be used for front-end system of cognitive radio for sensing the spectrum in various modes.

Quasi-self-complementary ultra-wideband antenna with band rejection characteristics

2018 ◽  
Vol 10 (3) ◽  
pp. 336-344 ◽  
Author(s):  
Rajarshi Sanyal ◽  
Partha Pratim Sarkar ◽  
Santosh Kumar Chowdhury
Keyword(s):  
Impedance Matching ◽  
Ground Plane ◽  
Equivalent Circuit Model ◽  
Ultra Wideband ◽  
Antenna Design ◽  
Impedance Bandwidth ◽  
Novel Structure ◽  
Quarter Wavelength ◽  
Matching Element ◽  
Rejection Band

This article presents a compact novel quasi-self-complementary semi-octagonal-shaped antenna for ultra-wideband (UWB) application. The proposed novel structure is fed by a microstrip line where different rectangular truncation is etched to the ground plane as an impedance matching element, which results for much wider impedance bandwidth (VSWR<2) from 2.9 to 20 GHz. In order to obtain band-notched characteristics at 5.5 GHz, an open-ended, quarter wavelength, spiral-shaped stub is introduced in the vicinity of the truncated part of the ground plane. An equivalent circuit model is adopted to investigate the band rejection characteristics of the ground plane stub. Sharpness of the rejection band can be controlled by maintaining the gap between stub resonator and the slotted periphery of ground plane. The proposed antenna design is validated by experimental measurements.

scholarly journals An Artificial Magnetic Conductor-Based Wideband Circularly Polarized Antenna with Low-Profile and Enhanced Gain

Electronics ◽  
2021 ◽  
Vol 10 (17) ◽  
pp. 2121
Author(s):  
Lina Qiu ◽  
Gaobiao Xiao
Keyword(s):  
Impedance Matching ◽  
Axial Ratio ◽  
Center Frequency ◽  
Impedance Bandwidth ◽  
Orthogonal Polarization ◽  
Magnetic Conductor ◽  
Circularly Polarized ◽  
Artificial Magnetic Conductor ◽  
Low Profile ◽  
Simulation And Experiment

A broadband circularly polarized (CP) antenna with enhanced gain and low profile is proposed. Two identical dipoles with full wavelength are placed orthogonally to generate radiation waves with equal amplitude and orthogonal polarization. The arms of the dipoles are designed as stepped patches to enlarge the impedance matching bandwidth and axial ratio (AR) bandwidth. Crossed-dipoles with full wavelength are utilized as the main radiators to provide a wide operating bandwidth and enhanced gain, and an artificial magnetic conductor (AMC) structure is introduced as the reflector to reduce the profile of the whole antenna. Due to the introduction of the AMC structure, the antenna profile is reduced from 12.8 to 6.9 mm, that is, reduced to 0.14λ0 (where λ0 denotes the wavelength corresponding to the center frequency of the passband, 4.0–8.5 GHz). A simulation and experiment were carried out to verify the performance of the proposed antenna. Experimental results showed that the antenna realized an impedance bandwidth of 74%, an AR bandwidth of 67.7%, a peak gain of 12.1 dBic, and an average gain of 10.69 dBic.

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