scholarly journals Broadband Dipole-Loop Combined Nanoantenna Fed by Two-Wire Optical Transmission Line

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Janilson L. de Souza ◽  
Karlo Q. da Costa ◽  
Victor Dmitriev ◽  
Felipe Bamberg
Keyword(s):  
Reflection Coefficient ◽  
Transmission Line ◽  
Radiation Pattern ◽  
Method Of Moments ◽  
Input Impedance ◽  
Optical Transmission ◽  
Near Field ◽  
Impedance Matching ◽  
Linear Method ◽  
Geometrical Parameters

This paper presents a broadband nanoantenna fed by a two-wire optical transmission line (OTL). The antenna is defined by a combination of a dipole and a loop, where only the dipole element is connected to the OTL. The analysis is fulfilled by the linear method of moments with equivalent surface impedance to model the conductors. Firstly, the nanoantenna alone is investigated, where the input impedance, current distribution, reflection coefficient, fractional bandwidth, radiation efficiency, and radiation pattern are analyzed. Then, the input impedance matching of this antenna with the OTL is considered. In this case the current, near field distribution, radiation pattern, and reflection coefficient are calculated for different geometrical parameters. The results show that the loop inserted in the circuit can increase the bandwidth up to 42% and decreases the reflection coefficient in the OTL to −25 dB.

scholarly journals Analysis of Nanodipoles in Optical Nanocircuits Fed by Gaussian Beam

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Karlo Costa ◽  
Victor Dmitriev ◽  
Janilson Souza ◽  
Gustavo Silvano
Keyword(s):  
Numerical Analysis ◽  
Transmission Line ◽  
Gaussian Beam ◽  
Method Of Moments ◽  
Optical Transmission ◽  
Impedance Matching ◽  
Linear Method ◽  
Geometrical Parameters ◽  
Cylindrical Conductors ◽  
Incident Gaussian Beam

We analyze impedance matching and excitation properties of a plasmonic optical nanocircuit composed by a receiving and an emitting dipole connected by a two-wire optical transmission line. The circuit is fed by a circular Gaussian beam focused on the receiving dipole. The numerical analysis is performed by linear method of moments with a given surface impedance of gold cylindrical conductors. With this model, we analyze the variation of standing-wave response along the circuit in function of some geometrical parameters. We present some conclusions concerning impedance matching between the transmission line and the emitting dipole and coupling between the receiving dipole and the incident Gaussian beam.

Radome-covered substrate-integrated cavity-backed patch antenna surrounded by dielectric material

2015 ◽  
Vol 8 (2) ◽  
pp. 379-384 ◽  
Author(s):  
Muhammad Javid Asad ◽  
Muhammad Farhan Shafique
Keyword(s):  
Surface Waves ◽  
Radiation Pattern ◽  
Patch Antenna ◽  
Input Impedance ◽  
Dielectric Material ◽  
Impedance Matching ◽  
Dielectric Coating ◽  
Electromagnetic Bandgap ◽  
Close Proximity ◽  
Metallic Strip

The substrate-integrated cavity-backed patch antenna embedded in dielectric-coated structure is presented. The aperture of antenna is covered with composite radome. The close proximity of radome to antenna severely degrades input impedance matching. The dielectric coating, a thick dielectric material, significantly deteriorates radiation pattern of antenna due to propagation of surface waves in the surrounding dielectric coating. The proposed planar electromagnetic bandgap structure reduces the propagation of surface waves in the dielectric coating recovering deterioration in the radiation pattern of the antenna. The problem of input impedance mismatching of antenna is resolved by placing a metallic strip on the top of the radome. The simulated results are in good agreement with measured results.

scholarly journals A Compact Dual-Band Planar Monopole Antenna Using Fractal Rings and A Y-Shaped Feeding Transmission Line

Frequenz ◽  
2019 ◽  
Vol 73 (1-2) ◽  
pp. 25-36
Author(s):  
Kahina Djafri ◽  
Mouloud Challal ◽  
Jordi Romeu
Keyword(s):  
Transmission Line ◽  
Radiation Pattern ◽  
Impedance Matching ◽  
Ground Plane ◽  
Monopole Antenna ◽  
Dual Band ◽  
Laptop Computer ◽  
Rectangular Slot ◽  
Dual Band Antenna ◽  
Band Characteristic

Abstract This paper presents a novel design approach of a compact dual-band monopole antenna with an overall size of 18.9x13x1.6mm3. The proposed antenna is composed of a fractal ring shaped patch fed by a Y-shaped transmission line on the top side of the substrate and a second fractal ring along with a U-shaped ground plane on the bottom side. The second fractal ring, identical to the radiating ring, is loaded and a rectangular slot is etched at the top side of the ground plane respectively, to achieve dual-band characteristic and improve the impedance matching. The effect of standard ground-plane (SGP) of a laptop computer is incorporated in the design; the antenna is mounted on a SGP in order to investigate its performance. The antenna covers widely the frequency bands of the WLAN 2.4 GHz (2.2–2.52 GHz) and WiMAX 3.5 GHz (3.32–4.35 GHz), and exhibits an omnidirectional radiation pattern in the H-plane and a monopole like radiation pattern in the E-plane. A good agreement between the simulated and measured results indicates that the proposed dual-band antenna design is suitable for WLAN/WiMAX applications.

scholarly journals Design of Parallel-Plate Transmission Line Feeding Differentially Driven Patch Antenna for GPS application

2013 ◽  
Vol 12 (4) ◽  
pp. 3411-3416
Author(s):  
Krishna Mani Pandey ◽  
Nitin Muchhal ◽  
Kamal Niwaria ◽  
Dr. Sunanda Manke
Keyword(s):  
Resonant Frequency ◽  
Transmission Line ◽  
Radiation Pattern ◽  
Patch Antenna ◽  
Input Impedance ◽  
Parallel Plate ◽  
Return Loss ◽  
Gain Bandwidth

In this paper a newly developed patch antenna, designated as the parallel-plate transmission line feeding differentially driven patch antenna is presented. The parallel-plate transmission line will not introduce inductance to the input impedance of a patch antenna, thus the height of the patch can be largely increased.  Measurements show that the 3-dB-gain bandwidth can be obtained to 65% (0.86–1.93 GHz), return loss is -20dB, VSWR is 1.3 and impedance is 51 ohm at resonant frequency of 1.58GHz. The radiation pattern is stable and this antenna is designed for GPS application.

scholarly journals On the Design of Conical Antennas for Broadband Impedance Matching Performance

2017 ◽  
Vol 2017 ◽  
pp. 1-13
Author(s):  
Francisco Estêvão Simão Pereira ◽  
Maurício Henrique Costa Dias
Keyword(s):  
Input Impedance ◽  
Impedance Matching ◽  
Closed Form Solution ◽  
Form Solution ◽  
Geometrical Parameters ◽  
Performance Potential ◽  
Biconical Antenna ◽  
Matching Performance ◽  
Design Perspective ◽  
The Impact

In the scope of broadband radiators, the biconical antenna, or its monopole conical counterpart, is long known to be a proper choice. One common form of such radiator, the spherically capped conical antenna (SCCA), has closed-form solution to its input impedance, from which the broadband performance potential is easily verified. Nonetheless, from the design perspective, apart from a few clues inferred from existing solutions, little is found to accurately guide the choice of the main geometrical parameters of the antenna that will enable it to comply with a set of imposed bandwidth requirements. This paper proposes a simple 10-step sequence to derive conical or biconical antenna design charts. These charts provide straightforward information on the geometrical limits within which the required antenna impedance matching broadband performance is achieved. The method is assessed for the SCCA and the open conical antenna (OCA) using theoretical and simulated estimates of the input impedance. A discussion on the impact of the cap and the feed gap is included.

scholarly journals Folded Spiral Resonator with Double-Layered Structure for Near-Field Wireless Power Transfer

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1581 ◽  
Author(s):  
Takaya Arai ◽  
Hiroshi Hirayama
Keyword(s):  
Layered Structure ◽  
Input Impedance ◽  
Near Field ◽  
Impedance Matching ◽  
Wireless Power Transfer ◽  
Transfer Efficiency ◽  
Power Transfer ◽  
Wireless Power ◽  
Conventional Models ◽  
Resonant Capacitor

In this paper, a folded spiral resonator with a double-layered structure for near-field wireless power transfer is proposed. In near-field wireless power transfer, conjugate impedance matching is important to achieve high transfer efficiency. To achieve maximum available efficiency, it is common to connect a matching circuit to the antenna. However, the loss increases if a matching circuit is used. A coupling inductor with a resonant capacitor has the capability to adjust an imaginary part of the input impedance, whereas the folded spiral resonator has the capability to adjust both the imaginary and real parts of the input impedance. This resonator can achieve the maximum available efficiency without a matching circuit. This paper shows that the folded spiral resonator with a double-layered structure realizes high transfer efficiency compared to conventional models.

Broadband multi-layer antenna with improved design for the applications of perfect impedance matching

2014 ◽  
Vol 7 (6) ◽  
pp. 747-752 ◽  
Author(s):  
Mahmoud Abdipour ◽  
Saba Kazemi Alishahi ◽  
Kambiz Noormohammadi
Keyword(s):  
Transmission Line ◽  
Radiation Pattern ◽  
Microstrip Antenna ◽  
Impedance Matching ◽  
Radiation Efficiency ◽  
Impedance Bandwidth ◽  
Cross Polarization ◽  
Measurement Results ◽  
Improved Design ◽  
5 Ghz

In this paper, the design of a broadband multi-layer microstrip antenna is presented. The broadband characteristics are the results of coupled resonances of the patch and transmission line through the resonant aperture. For this purpose, a cross-shaped transmission line, a ring slot, and a shaped ring patch are used. The simulation and measurement results indicate that a wide impedance bandwidth of 70% for |S11| < −10 dB and a perfect impedance matching 35% for |S11| < −20 dB are achieved. The gain is stable over the impedance bandwidth. The maximum gain of the proposed antenna is 8.8 dBi at 5 GHz. The radiation pattern, radiation efficiency, and cross-polarization are also suitable throughout the impedance bandwidth.

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