scholarly journals SNR Enhancement of an Electrically Small Antenna Using a Non-Foster Matching Circuit

2020 ◽  
Vol 10 (13) ◽  
pp. 4464
Author(s):  
Yong-Hyeok Lee ◽  
Sung-yong Cho ◽  
Jae-Young Chung
Keyword(s):  
Signal To Noise Ratio ◽  
Impedance Matching ◽  
Antenna System ◽  
Broadband Antenna ◽  
Electrically Small Antenna ◽  
Low Dissipation ◽  
Received Power ◽  
Small Antenna ◽  
The Stability ◽  
Dissipation Loss

A non-Foster circuit (NFC) is known as an active broadband matching technique to improve the impedance matching bandwidth of an electrically small antenna (ESA). There has been a vast amount of papers that report the generation of negative impedance using an NFC and its effectiveness on broadband antenna matching. However, only a few discussed its impact on the signal-to-noise-ratio (SNR), which is one of the most important figures-of-merit for a wireless communication system. In this paper, the SNR enhancement due to an NFC was measured and discussed. An NFC was carefully designed to have a low dissipation loss and to meet the stability conditions. The optimized NFC design was fabricated and applied to an ESA length of λ⁄15 at a frequency range of 150 to 300 MHz. The measured results showed that the NFC enhanced the received power of the antenna system by more than 17 dB. However, due to the noise added by the NFC, the SNR enhancement was not guaranteed for some frequency points. Nevertheless, an average of 7.3 dB of SNR improvement over the frequency band of interest is possible based on the experiment result.

scholarly journals A High-Efficiency Compact Planar Antenna for ISM Wireless Systems

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Tao Zhou ◽  
Yazi Cao ◽  
Zhiqun Cheng ◽  
Martine Le Berre ◽  
Francis Calmon
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Impedance Matching ◽  
Wireless Systems ◽  
Planar Antenna ◽  
Wireless Applications ◽  
Electrically Small Antenna ◽  
Lumped Elements ◽  
Small Antenna ◽  
Compact Planar

A novel high-efficiency compact planar antenna at 433 MHz with minimized size and low-cost and easy to integrate into the ISM wireless applications is designed, fabricated, and measured. Capacitive strips that are formed by cutting inter-digital slots and the meander lines on both sides are introduced to greatly reduce the antenna size yet maintain the high efficiency. The proposed antenna has a simple planar structure and occupies a small area (i.e., 45 × 30 mm2). This novel electrically small antenna can be operated well without any lumped elements for impedance matching. Details of the antenna design and experimental results are presented and discussed.

scholarly journals Design and Characterization of VHF Band Small Antenna Using CRLH Transmission Line and Non-Foster Matching Circuit

2020 ◽  
Vol 10 (18) ◽  
pp. 6366
Author(s):  
Soyeong Lee ◽  
Jonghyup Lee ◽  
Seongro Choi ◽  
Yong-Hyeok Lee ◽  
Jae-Young Chung ◽  
...  
Keyword(s):  
Transmission Line ◽  
Spiral Inductor ◽  
Potential Candidate ◽  
Very High Frequency ◽  
Electrically Small Antenna ◽  
Left Handed ◽  
Received Power ◽  
Low Profile ◽  
Power Enhancement ◽  
Small Antenna

In this paper, we propose an electrically small antenna consisting of a composite right/left-handed (CRLH) transmission line (TL) and a non-Foster matching circuit. An interdigital capacitor (IDC) and spiral inductor are used to fabricate the very high frequency (VHF) band antenna based on CRLH TL. The size of the proposed antenna is as small as 0.025 × 0.014 × 0.0008 λ at 145.5 MHz using the zeroth-order resonant generated by the CRLH TL. The antenna operation bandwidth is extended by the non-Foster circuit (NFC) consisting of a pair of transistors in a cross-coupled manner. An antenna prototype is fabricated and the input impedance, the received power, and gain of the proposed antenna are measured. The results show that the broadband characteristic is maintained while the form factor is extremely small compared to the wavelength. The average received power enhancement and increased bandwidth of antenna are 17.3 dB and 335.5 MHz (from 249.2–268.2 to 145.5–500 MHz), respectively. The calculated gain of the proposed antenna with the non-Foster is about −45 dBi at 155 MHz. The proposed antenna can be considered as a potential candidate of a low-profile antenna for military ground communications at the VHF band.

scholarly journals Impedance Matching of Electrically Small Antenna with Ni-Zn Ferrite Film

2013 ◽  
Vol 18 (4) ◽  
pp. 428-431 ◽  
Author(s):  
Jaejin Lee ◽  
Yang-Ki Hong ◽  
Woncheol Lee ◽  
Jihoon Park
Keyword(s):  
Impedance Matching ◽  
Ferrite Film ◽  
Electrically Small Antenna ◽  
Zn Ferrite ◽  
Small Antenna

Active Impedance Matching

2013 ◽  
Vol 210 ◽  
pp. 3-8 ◽  
Author(s):  
Katarzyna Jagodzińska ◽  
Stanisław Dziura ◽  
Maciej Walkowiak
Keyword(s):  
Impedance Matching ◽  
High Q ◽  
Electrically Small Antenna ◽  
Narrow Bandwidth ◽  
Small Antenna ◽  
Active Matching ◽  
Active Impedance

Electrically small antenna suffer from the high Q impedance such as narrow bandwidth and poor gain. To improve them, passive impedance matching is often used but it is restricted to a Bode-Fano limit. To skip it, active matching incorporating non-Foster circuits can provide a good solution. Using non-Foster theory, in this paper an active reactance circuit (ARC) design is proposed for application to electrically small antenna prototypes.

A High-Directivity, Wideband, Efficient, Electrically Small Antenna System

2014 ◽  
Vol 62 (12) ◽  
pp. 6541-6547 ◽  
Author(s):  
Ming-Chun Tang ◽  
Richard W. Ziolkowski ◽  
Shaoqiu Xiao ◽  
Mei Li
Keyword(s):  
Antenna System ◽  
Electrically Small Antenna ◽  
Small Antenna
Sign in / Sign up

Export Citation Format

Share Document