scholarly journals Minimized Low-Profile Wideband Antennas Using High Impedance Surface

2017 ◽  
Vol 2017 ◽  
pp. 1-12
Author(s):  
Yizhu Shen
Keyword(s):  
Radio Frequency ◽  
Low Cost ◽  
Dielectric Substrate ◽  
Impédance Surface ◽  
Impedance Surface ◽  
Antenna Size ◽  
High Impedance ◽  
Low Profile ◽  
Wireless Application ◽  
High Impedance Surface

This paper proposes minimized low-profile wideband antenna by employing high impedance surface (HIS), for wireless application scenarios at radio frequency, microwave, and even terahertz. To validate this concept with low cost and easy measurement, two prototypes at radio frequency are fabricated and tested. Firstly, antenna with dielectric-substrate reflector is proposed and analyzed and 4 × 6 HIS array is employed to minimize the antenna size to 0.57λL×0.86λL×0.078λL, while maintaining antenna performances such as bandwidth, gain, and directive radiation. Secondly, a substrate-less HIS is proposed to improve the antenna bandwidth from 36% to 52% and also reduces the antenna weight by 72%.

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.

scholarly journals Varying operating frequency of concentric circular ring patch antenna using high impedance surface

2018 ◽  
Vol 7 (3.29) ◽  
pp. 57
Author(s):  
Rangarao. Orugu ◽  
Srilatha. Gundapaneni ◽  
N Maryleena ◽  
A K.Chaithanya Varma
Keyword(s):  
Patch Antenna ◽  
Return Loss ◽  
Circular Ring ◽  
Impédance Surface ◽  
Impedance Surface ◽  
Antenna Size ◽  
High Impedance ◽  
Circular Patch Antenna ◽  
High Impedance Surface ◽  
Microstrip Feed

In this paper, we design a concentric circular patch antenna excited by microstrip feed and operates at 5.4269 GHz and 6.9419 GHz. After designing the antenna, we would like to tune the frequency without changing antenna size. For that purpose, we use high impedance surface structure to tune the antenna at two different frequencies. A simple mushroom like structure is used as high impedance surface. We will analyze antenna parameters like return loss, gain, directivity, radiation patterns, efficiency, proposed antenna with and without high impedance surfaces and compare the results.  

scholarly journals Low Profile Fully Planar Folded Dipole Antenna on a High Impedance Surface

2012 ◽  
Vol 60 (1) ◽  
pp. 51-62 ◽  
Author(s):  
Andrea Vallecchi ◽  
Javier R. De Luis ◽  
Filippo Capolino ◽  
Franco De Flaviis
Keyword(s):  
Dipole Antenna ◽  
Impédance Surface ◽  
Impedance Surface ◽  
High Impedance ◽  
Low Profile ◽  
Folded Dipole ◽  
High Impedance Surface
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