Design of resonant small antenna using composite right/left-handed transmission line

2005 ◽  
Author(s):  
Cheng-Jung Lee ◽  
K.M.K.H. Leong ◽  
T. Itoh
Keyword(s):  
Transmission Line ◽  
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.

Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20502
Author(s):  
Behrokh Beiranvand ◽  
Alexander S. Sobolev ◽  
Anton V. Kudryashov
Keyword(s):  
Transmission Line ◽  
Terahertz Radiation ◽  
Transmission Lines ◽  
Software Package ◽  
Optical Pulses ◽  
Capacitively Coupled ◽  
Voltage Difference ◽  
Left Handed ◽  
Microwave Transmission ◽  
Commercial Software Package

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

A Multilayer Compact Solid State Composite Right/Left-Handed Metamaterial Transmission Line

2008 ◽  
Vol 29 (12) ◽  
pp. 1383-1385 ◽  
Author(s):  
Zhirun Hu ◽  
Philip D. Curtis ◽  
Wei Tong
Keyword(s):  
Solid State ◽  
Transmission Line ◽  
Left Handed
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