Characterization of a loaded high impedance surface

2009 ◽  
Vol 1 (6) ◽  
pp. 483-487 ◽  
Author(s):  
Fabrice Linot ◽  
Xavier Begaud ◽  
Michel Soiron ◽  
Christian Renard ◽  
Michèle Labeyrie
Keyword(s):  
Incidence Angle ◽  
Transverse Magnetic ◽  
Impédance Surface ◽  
Impedance Surface ◽  
High Impedance ◽  
At Resonance ◽  
Wide Range ◽  
Judicious Choice ◽  
High Impedance Surface

A high impedance surface (HIS) consisting of metallic square patches electrically connected one to each other with resistors is shown. Tunability of the absorption factor is achieved by the resistor value. The absorbing band of the loaded HIS is determined by the phase of the signal reflected by this structure. The main contribution of the paper is to demonstrate the absorption behavior over a wide range of incidence angle for both Transverse Electric (TE) and Transverse Magnetic (TM) polarizations. Using an equivalent circuit the resistor effect is investigated. It is shown that at resonance, the judicious choice of the resistor may lead to a significant absorption. The use of a waveguide simulator to characterize the performance of the loaded HIS is investigated. These methods have been used to design an ultra-thin absorber about λ8.4 GHz/35 thick.

Reflection phase characterization of the MEMS-based high impedance surface

2012 ◽  
Author(s):  
Zhou Du ◽  
Juha Ala-Laurinaho ◽  
Dmitry Chicherin ◽  
Antti V. Raisanen ◽  
Mikael Sterner ◽  
...  
Keyword(s):  
Impédance Surface ◽  
Impedance Surface ◽  
Reflection Phase ◽  
High Impedance ◽  
Phase Characterization ◽  
High Impedance Surface

scholarly journals Tomographic Characterization of a Multifunctional Composite High-Impedance Surface

2018 ◽  
Vol 66 (6) ◽  
pp. 2904-2913 ◽  
Author(s):  
Kelvin J. Nicholson ◽  
Thomas C. Baum ◽  
Richard W. Ziolkowski ◽  
Kamran Ghorbani ◽  
Greg Bain
Keyword(s):  
Impédance Surface ◽  
Impedance Surface ◽  
High Impedance ◽  
High Impedance Surface

scholarly journals Impedance Enhancement of Textile Grounded Loop Antenna Using High-Impedance Surface (HIS) for Healthcare Applications

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3809
Author(s):  
Mohammed M. Bait-Suwailam ◽  
Isidoro I. Labiano ◽  
Akram Alomainy
Keyword(s):  
Impedance Matching ◽  
Loop Antenna ◽  
Healthcare Applications ◽  
Impédance Surface ◽  
Antenna Structure ◽  
Impedance Surface ◽  
High Impedance ◽  
Low Profile ◽  
Close Proximity ◽  
High Impedance Surface

In this paper, impedance matching enhancement of a grounded wearable low-profile loop antenna is investigated using a high-impedance surface (HIS) structure. The wearable loop antenna along with the HIS structure is maintained low-profile, making it a suitable candidate for healthcare applications. The paper starts with investigating, both numerically and experimentally, the effects of several textile parameters on the performance of the wearable loop antenna. The application of impedance enhancement of wearable grounded loop antenna with HIS structure is then demonstrated. Numerical full-wave simulations are presented and validated with measured results. Unlike the grounded wearable loop antenna alone with its degraded performance, the wearable loop antenna with HIS structure showed better matching performance improvement at the 2.45 GHz-band. The computed overall far-field properties of the wearable loop antenna with HIS structure shows good performance, with a maximum gain of 6.19 dBi. The effects of bending the wearable loop antenna structure with and without HIS structure as well as when in close proximity to a modeled human arm are also investigated, where good performance was achieved for the case of the wearable antenna with the HIS structure.

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