A Varactor-Tunable High Impedance Surface With a Resistive-Lumped-Element Biasing Grid

2007 ◽  
Vol 55 (7) ◽  
pp. 1955-1962 ◽  
Author(s):  
Christos Mias ◽  
Jyh Haur Yap
Keyword(s):  
Impédance Surface ◽  
Impedance Surface ◽  
Lumped Element ◽  
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.

An optically transparent wideband High Impedance Surface

2016 ◽  
Author(s):  
Mahmoud M. Mostafa ◽  
Mohamed I. Ibrahim ◽  
Amr M.E. Safwat ◽  
Tamer M. Abuelfadl
Keyword(s):  
Impédance Surface ◽  
Impedance Surface ◽  
High Impedance ◽  
Optically Transparent ◽  
High Impedance Surface
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