scholarly journals Cylindrical Bending of Deformable Textile Rectangular Patch Antennas

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Freek Boeykens ◽  
Luigi Vallozzi ◽  
Hendrik Rogier
Keyword(s):  
Resonance Frequency ◽  
Radiation Pattern ◽  
Patch Antennas ◽  
Rectangular Patch ◽  
Full Wave ◽  
Wearable Systems ◽  
Proposed Model ◽  
Textile Antenna ◽  
Bending Radius ◽  
Physical Insight

Textile patch antennas are well known as basic components for wearable systems that allow communication between a human body and the external world. Due to their flexibility, textile antennas are subjected to bending when worn, causing a variation in resonance frequency and radiation pattern with respect to the flat state in which their nominal design is performed. Hence, it is important for textile antenna engineers to be able to predict these performance parameters as a function of the bending radius. Therefore, we propose a comprehensive analytical model that extends the cylindrical cavity model for conformal rigid patch antennas by incorporating the effects of patch stretching and substrate compression. It allows to predict the resonance frequency and the radiation pattern as a function of the bending radius. Its validity has been verified experimentally. Unlike previous contributions, which concerned only qualitative studies by means of measurements and numerical full-wave simulations, the proposed model offers advantages in terms of physical insight, accuracy, speed, and cost.

A wearable textile antenna for wireless power transfer by magnetic resonance

2017 ◽  
Vol 88 (8) ◽  
pp. 913-921 ◽  
Author(s):  
Eunah Heo ◽  
Keun-Yeong Choi ◽  
Jooyong Kim ◽  
Jong-Hu Park ◽  
Hojin Lee
Keyword(s):  
Magnetic Resonance ◽  
Resonance Frequency ◽  
Power Transmission ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Human Body Model ◽  
Spiral Coil ◽  
Textile Antenna ◽  
Bending Radius

The paper presents a wearable textile antenna embroidered on a fabric for wireless power transfer systems. A planar spiral coil was generated with the conductive thread on a cotton substrate, and was connected to a rectifier circuit fabricated on flexible polyethylene terephthalate film to constitute a bendable receiver by the magnetic resonance. At a resonance frequency of 6.78 MHz, the proposed system could achieve −5.51 dB transfer efficiency and 12.75 mW power transmission at a distance of 15 cm. It was also demonstrated that the resonance frequency and transmitted power of the proposed system could be maintained as the same even when the system was bent conformingly to the surface curvature of the human body model for a bending radius up to 50 mm or larger.

Design of S-Band Antenna With L-Shaped Slits on Rectangular Patch With Defected Ground Structure

2018 ◽  
Vol 7 (2) ◽  
pp. 50-58
Author(s):  
Ketavath Kumar Naik ◽  
Ravi Kumar Palla ◽  
Sriram Sandhya Rani ◽  
Dattatreya Gopi
Keyword(s):  
Resonance Frequency ◽  
Radiation Pattern ◽  
Patch Antenna ◽  
Return Loss ◽  
Impedance Bandwidth ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Rectangular Patch ◽  
Antenna Model

Monopole L-shaped slits are embedded on rectangular patch antenna is designed for S-band applications. The proposed antenna is a square patch radiator with four L-shaped slits are presented. The proposed antenna radiates at 3GHz resonance frequency with bandwidth of 1.9GHz and -26.4dB return loss. The impedance bandwidth is enhanced 62.7% with proposed antenna model. The proposed L-shaped slit patch antenna is small in size and compact. The radiation pattern is presented in the results and it works at S-band applications.

Crosspolarisation characteristics of rectangular patch antennas

1988 ◽  
Vol 24 (8) ◽  
pp. 463 ◽  
Author(s):  
T. Huynh ◽  
K.F. Lee ◽  
R.Q. Lee
Keyword(s):  
Patch Antennas ◽  
Rectangular Patch

Mutual coupling between electromagnetically coupled rectangular patch antennas

1991 ◽  
Vol 27 (6) ◽  
pp. 532 ◽  
Author(s):  
R.Q. Lee ◽  
T. Talty ◽  
K.F. Lee
Keyword(s):  
Mutual Coupling ◽  
Patch Antennas ◽  
Rectangular Patch

scholarly journals Design and Modeling of New UWB Metamaterial Planar Cavity Antennas with Shrinking of the Physical Size for Modern Transceivers

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Mohammad Alibakhshi Kenari
Keyword(s):  
Transmission Lines ◽  
Patch Antenna ◽  
Patch Antennas ◽  
Frequency Bandwidth ◽  
Left Handed ◽  
Full Wave ◽  
Radiation Properties ◽  
Unit Cells ◽  
Constitutive Parameters ◽  
Large Frequency

A variety of antennas have been engineered with MTMs and MTM-inspired constructs to improve their performance characteristics. This report describes the theory of MTMs and its utilization for antenna's techniques. The design and modeling of two MTM structures withε-μconstitutive parameters for patch antennas are presented. The framework presents two novel ultrawideband (UWB) shrinking patch antennas filled with composite right-/left-handed transmission line (CRLH-TL) structures. The CRLH-TL is presented as a general TL possessing both left-handed (LH) and right-handed (RH) natures. The CRLH-TL structures enhance left-handed (LH) characteristics which enable size reduction and large frequency bandwidth. The large frequency bandwidth and good radiation properties can be obtained by adjusting the dimensions of the patches and CRLH-TL structures. This contribution demonstrates the possibility of reducing the size of planar antennas by using LH-transmission lines. Two different types of radiators are investigated—a planar patch antenna composed of fourO-formed unit cells and a planar patch antenna composed of sixO-shaped unit cells. A CRLH-TL model is employed to design and compare these two approaches and their realization with a varying number ofL-Cloaded unit cells. Two representative antenna configurations have been selected and subsequently optimized with full-wave electromagnetic analysis. Return loss and radiation pattern simulations of these antennas prove the developed concept.

scholarly journals Characteristics of VLF atmospherics near the resonance frequency of the Earth-ionosphere waveguide 1.6–2.3 kHz by observations in the auroral region

2010 ◽  
Vol 28 (1) ◽  
pp. 193-202 ◽  
Author(s):  
A. A. Ostapenko ◽  
E. E. Titova ◽  
A. P. Nickolaenko ◽  
T. Turunen ◽  
J. Manninen ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Spectral Maximum ◽  
Left Hand ◽  
Ionosphere Plasma ◽  
Full Wave ◽  
Transverse Resonance ◽  
The Earth ◽  
Polarized Waves ◽  
Small Absorption ◽  
The Right

Abstract. Recordings of ELF-VLF waves with the right-hand (RH) and the left-hand (LH) circular polarization were made in Northern Finland. Analysis showed a difference between the RH and LH polarized waves. A pronounced maximum of the wave amplitude was observed at the first critical frequency of the Earth-ionosphere waveguide (the first transverse resonance) around 1.6–2.3 kHz. The wave had the circular LH polarization at this maximum. To interpret observations, we computed the characteristics of the waveguide modes by using the full wave solution in the night model of the ionosphere. Computations show that the spectral maximum at the first transverse resonance frequency arises from a small absorption of the LH polarized radio wave in the magnetized ionosphere plasma, forming the upper boundary of the Earth-ionosphere waveguide.

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