scholarly journals 2.45 GHz high-gain electrically small antenna with composite right/left-handed ladder structure

2012 ◽  
Vol 48 (16) ◽  
pp. 971-972 ◽  
Author(s):  
K. Takahagi ◽  
E. Sano ◽  
Y. Otsu
Keyword(s):  
High Gain ◽  
Ladder Structure ◽  
Electrically Small Antenna ◽  
Left Handed ◽  
Small Antenna

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.

An Efficient, Wideband, CPW-Fed Antenna Based on Simplified Composite Right/Left-Handed Transmission Line

Frequenz ◽  
2017 ◽  
Vol 71 (1-2) ◽  
pp. 37-40
Author(s):  
Zhaozhan Li ◽  
Cheng Zhou ◽  
Yanhong Lin
Keyword(s):  
Transmission Line ◽  
Resonance Frequency ◽  
Dispersion Analysis ◽  
Order Mode ◽  
Electrically Small Antenna ◽  
Left Handed ◽  
Resonance Frequencies ◽  
Unit Cells ◽  
In Series ◽  
Small Antenna

Abstract A wideband electrically small antenna (ESA) based on simplified composite right/left-handed transmission line (SCRLH-TL) is designed, fabricated and tested. The antenna consists of two different sized SCRLH-TL unit cells with different+1st-order mode resonance frequencies. The wideband property of antenna is achieved when these two+1st-order mode resonance frequency suitably merge. A dispersion analysis of the SCRLH-TL reveals that an increase in series of the dual-spiral capacitor would decrease the+1st-order mode resonance frequency, thus reducing the electrical size of the proposed antenna. The 10 dB fractional bandwidth (FBW10 dB) was 54.5 % and the measured maximum was 96.2 %, with an electrical size of 0.32λ0×0.16λ0×0.015λ0 at 3.0 GHz (where λ0 is the wavelength in vacuum). It is shown that the numerical results closely fit the measured results.

scholarly journals An Overview on Properties, Parameter Consideration And Design of Meandering Antenna

2012 ◽  
pp. 59-62
Author(s):  
V. B. Ambhore ◽  
A. P. Dhande
Keyword(s):  
Ground Plane ◽  
High Gain ◽  
Impedance Bandwidth ◽  
Electrically Small Antennas ◽  
Electrically Small Antenna ◽  
Antenna Performance ◽  
Directional Radiation ◽  
Narrow Bandwidth ◽  
Small Antenna ◽  
Meander Line

Meander line antenna (MLA) is an electrically small antenna. Electrically small antennas pose several performance related issues such as narrow bandwidth, high VSWR, low gain and high cross polarization levels. In this paper overview on properties, parameter consideration and design of MLA is proposed. The proposed antenna is designed for USB based application. The antenna performance parameters are optimized to achieve reasonably wide impedance bandwidth, high gain, VSWR < 2 and an Omni directional radiation pattern. Moreover, the current distribution and the effect of the ground plane size on the altered MLA are discussed in this paper.

scholarly journals High-Efficiency Polarizer Reflectarray Antennas for Data Transmission Links from a CubeSat

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1802
Author(s):  
Eduardo Martinez-de-Rioja ◽  
Daniel Martinez-de-Rioja ◽  
Rafael López-Sáez ◽  
Ignacio Linares ◽  
Jose A. Encinar
Keyword(s):  
Circular Polarization ◽  
Data Transmission ◽  
High Efficiency ◽  
High Gain ◽  
Dual Band ◽  
Left Handed ◽  
Linearly Polarized ◽  
Flat Profile ◽  
First Time ◽  
Collimated Beam

This paper presents two designs of high-efficiency polarizer reflectarray antennas able to generate a collimated beam in dual-circular polarization using a linearly polarized feed, with application to high-gain antennas for data transmission links from a Cubesat. First, an 18 cm × 18 cm polarizer reflectarray operating in the 17.2–22.7 GHz band has been designed, fabricated, and tested. The measurements of the prototype show an aperture efficiency of 52.7% for right-handed circular polarization (RHCP) and 57.3% for left-handed circular polarization (LHCP), both values higher than those previously reported in related works. Then, a dual-band polarizer reflectarray is presented for the first time, which operates in dual-CP in the frequency bands of 20 GHz and 30 GHz. The proposed antenna technology enables a reduction of the complexity and cost of the feed chain to operate in dual-CP, as a linear-to-circular polarizer is no longer required. This property, combined with the lightweight, flat profile and low fabrication cost of printed reflectarrays, makes the proposed antennas good candidates for Cubesat applications.

Integrating Superdirective Electrically Small Antenna Arrays in PCBs

2015 ◽  
pp. 1-1 ◽  
Author(s):  
Abdullah Haskou ◽  
Ala Sharaiha ◽  
Sylvain Collardey
Keyword(s):  
Antenna Arrays ◽  
Electrically Small Antenna ◽  
Small Antenna

A novel metamaterial-inspired electrically small antenna fed by CPW

2008 ◽  
Author(s):  
Meng Li ◽  
Xian Qi Lin ◽  
Jessie Yao Chin ◽  
Ruopeng Liu ◽  
Tie Jun Cui
Keyword(s):  
Electrically Small Antenna ◽  
Small Antenna

A high-gain lens antenna based on novel left-handed metamaterial

2017 ◽  
Author(s):  
Jian Yang ◽  
Feng Xu ◽  
Wenjian Chen ◽  
Lewei Cao
Keyword(s):  
High Gain ◽  
Lens Antenna ◽  
Left Handed
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