scholarly journals Circularly Polarized Annular Ring Antenna With Wide Axial-Ratio Bandwidth for Biomedical Applications

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 59999-60009 ◽  
Author(s):  
Li-Jie Xu ◽  
Yaming Bo ◽  
Wen-Jun Lu ◽  
Lei Zhu ◽  
Chengfei Guo
Keyword(s):  
Biomedical Applications ◽  
Axial Ratio ◽  
Circularly Polarized ◽  
Annular Ring ◽  
Ring Antenna

Compact circular polarized CPW antenna for WLAN and biomedical applications

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Navneet Sharma ◽  
Anubhav Kumar ◽  
Asok De ◽  
Rakesh K. Jain
Keyword(s):  
Biomedical Applications ◽  
Impedance Matching ◽  
Ground Plane ◽  
Surface Current ◽  
Axial Ratio ◽  
Breast Tumors ◽  
Maximum Permissible Level ◽  
Circularly Polarized ◽  
Ism Band ◽  
Phantom Model

Abstract A compact, circularly polarized, CPW-fed antenna is proposed for wearable applications in ISM Band (5.8 GHz). The antenna is based on DGS, where the ground plane is responsible for impedance matching. The 10 dB impedance of the proposed antenna varies from 5.39 GHz to 5.94 GHz. The circular stub introduced in the ground plane mitigates the surface current and enriches the 3 dB axial ratio from 5.73 GHz to 5.92 GHz. Proposed antenna exhibits the LHCP and RHCP pattern of circular polarization, the antenna can effectively work for biomedical and wearable applications. The antenna is analyzed on the skin phantom model and the SAR value obtained is 1.218 W/kg, which is below the maximum permissible level. The proposed antenna is also used for the detection of breast tumors.

scholarly journals A CIRCULARLY POLARIZED QUAD-BAND ANNULAR RING ANTENNA WITH ASYMMETRIC GROUND PLANE USING THEORY OF CHARACTERISTIC MODES

2021 ◽  
Vol 100 ◽  
pp. 51-68
Author(s):  
Reshmi Dhara ◽  
Sanjeev Yadav ◽  
Mahendra Mohan Sharma ◽  
Sanjay Kumar Jana ◽  
Mahesh Chandra Govil
Keyword(s):  
Ground Plane ◽  
Circularly Polarized ◽  
Annular Ring ◽  
Characteristic Modes ◽  
Ring Antenna

scholarly journals Design of Planar Microstrip Ultrawideband Circularly Polarized Antenna Loaded by Annular-Ring Slot

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Zhong-Hua Ma ◽  
Jia-Xiang Chen ◽  
Peng Chen ◽  
Yan Feng Jiang
Keyword(s):  
Impedance Matching ◽  
Axial Ratio ◽  
Fractional Bandwidth ◽  
Uwb Antenna ◽  
Compact Structure ◽  
Antenna Structure ◽  
Circularly Polarized ◽  
Annular Ring ◽  
Feed Line ◽  
Communication Devices

A miniaturized planar microstrip circularly polarized ultrawideband (UWB) antenna loaded by annular-ring slot is proposed and implemented in the paper. With the annular-ring slot loaded in the radiating patch of the antenna, the side of the radiating patch is connected by the asymmetric inverted L-shaped microstrip. At the same time, a quarter of a circle is cut off from the radiating patch. The above designed structure shows improvements on the operating frequency band and realization of the circular polarization radiation. A tapered microstrip is placed between the feed line and the radiating patch to achieve the slow-changing impedance transformation. The results of simulation and measurement demonstrate that the 3 dB axial ratio (AR) fractional bandwidth of the antenna structure achieves 21.25%. The peak gain within the 3 dB axial ratio bandwidth fluctuates between 3.74 and 4.59 dBi. The antenna shows good impedance matching in the ultrawideband range. With the compact structure of the UWB antenna, it has potential application in various wireless communication devices.

A Miniaturized Circularly Polarized Implantable Annular-Ring Antenna

2017 ◽  
Vol 16 ◽  
pp. 2566-2569 ◽  
Author(s):  
Rongqiang Li ◽  
Yong-Xin Guo ◽  
Bing Zhang ◽  
Guohong Du
Keyword(s):  
Circularly Polarized ◽  
Annular Ring ◽  
Ring Antenna

Analysis of Woven and Non-Woven Polyester Fabrics Made Flexible CP Annular Ring Textile Antenna

2019 ◽  
Vol 8 (2) ◽  
pp. 53-66
Author(s):  
Kiran Ramesh Rathod ◽  
B. K. Mishra
Keyword(s):  
Surface Wave ◽  
Axial Ratio ◽  
Substrate Material ◽  
Impedance Bandwidth ◽  
Polyester Fabrics ◽  
Circularly Polarized ◽  
Annular Ring ◽  
Textile Antenna ◽  
Wide Range ◽  
Wireless Application

This article reveals the characteristics of a probe-fed wideband circularly polarized (CP) annular ring textile antenna (ARTA). The proposed ARTA is fully flexible due to a conductive stack fabrics configuration for GSM-1800/ISM-2.4 GHz. The foremost aim of this article is to realize its performance under bending circumstances for wearable applications. The combinations of woven and non-woven polyester fabrics are used as a high-low substrate material to attain superb impedance bandwidth (BW) and worthy surface wave efficiency. A decent CP performance is realized by choosing the precise dimension of notches. It has measured and simulated impedance and the axial ratio (AR) BW of 18.33%, 13.88%, 7.86%, 2.86% and 3.97% in the lower and upper band, respectively. The optimization of CP in the upper band is under process. Results clarify that the CPARTA is beneficial for wearable and wireless application under bending circumstances. The proposed method is appropriate where a wide-range of CP bandwidth is essential.

A Broadband Circularly Polarized Cross-slotted Patch Antenna with Horizontal Meandered Strip (HMS)

Frequenz ◽  
2020 ◽  
Vol 74 (5-6) ◽  
pp. 191-199
Author(s):  
M. K. Verma ◽  
Binod K. Kanaujia ◽  
J. P. Saini ◽  
Padam S. Saini
Keyword(s):  
Circular Polarization ◽  
Patch Antenna ◽  
Impedance Matching ◽  
Axial Ratio ◽  
Impedance Bandwidth ◽  
Radiation Patterns ◽  
Circularly Polarized ◽  
Feeding Technique

AbstractA broadband circularly polarized slotted square patch antenna with horizontal meandered strip (HMS) is presented and studied. The HMS feeding technique provides the good impedance matching and broadside symmetrical radiation patterns. A set of cross asymmetrical slots are etched on the radiating patch to realize the circular polarization. An electrically small stub is added on the edge of the antenna for further improvement in performance. Measured 10-dB impedance bandwidth (IBW) and 3-dB axial ratio bandwidth (ARBW) of the proposed antenna are 32.31 % (3.14–4.35 GHz) and 20.91 % (3.34–4.12 GHz), respectively. The gain of the antenna is varied from 3.5 to 4.86dBi within 3-dB ARBW. Measured results matched well with the simulated results.

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