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The main purpose of this work is to study the directional coupler with left handed transmission lines, investigating the symmetry of the cells, their number and dimensions, presenting the advantages and disadvantages of using a type or another. Moreover, a comparison between the directional coupler built with micro-strip technology by using the metamaterials theory and the classical one designed with...
A miniaturized directive coupler with dual band behavior is presented in this paper. It is suitable for GSM applications and demonstrates good performances in both imposed bandwidths. The physical implementation is done using lumped elements with high quality factor and micro-strip technology with low losses. This ensures good performances while maintaining the dimensions of the device as small as...
The paper presents the results concerning the radiation characteristic scanning of a ferrite supported mm-wave (30 GHz) Zeroth-Order Resonating (ZOR) CoPlanar Waveguide (CPW) antenna based on Composite Right/Left-Handed (CRLH) transmission lines. The scanning effect is obtained by magnetically polarizing the ferrite substrate. The measurements demonstrate steering of the radiation characteristic between...
The Dual Composite Right Left Handed (D-CRLH) transmission lines are a newly introduced type of artificial transmission lines with various microwave applications [1]. This study investigates different types of implementation of these transmission lines and the influence over the performances. The study is carried using both lumped elements and microstrip implementation of the unit cells. The relations...
The paper presents the results obtained by magnetic biasing of a Composite Right / Left Handed (CRLH) CoPlanar Waveguide (CPW) Zeroth-Order Resonating (ZOR) antenna on ferrite substrate. The tuning effect is obtained as a result of remarkable properties of the ferrite substrate in the microwave frequencies domain when applying a biasing magnetic field. Data obtained by simulation with a suitable electromagnetic...
The paper present a mm-wave metamaterial CoPlanar Waveguide Zeroth-Order Resonating antenna on magnetically biased ferrite substrate. The measurements demonstrate affecting of the antenna resonant frequency, return loss and radiation characteristic depending on the strength of biasing magnetic field. The resonant frequency shifts of about 1.1 GHz for magnetic biasing field variation between 0 T and...
In this paper there are studied the electromagnetical phenomena which appear when coupling two Composite Right-Left Handed (CRLH) artificial transmission lines with different cells dimensions, one of them being two times smaller. There are analyzed the frequency ranges where the strong coupling appears and also, the differences between the simulated results and the measured ones are compared.
This paper present the results in designing, processing and measurements of a zeroth-order resonance (ZOR) antenna in the mm-wave frequency domain using Composite Right/Left-Handed (CRLH) structures. Antenna was fabricated on high resistivity silicon substrate seeking for a subsequent integration in a more complex mm-wave circuit. Experimental results show S11 < −45 dB at 38.47 GHz, −3 dB...
The paper presents a zeroth order resonance Composite Right/Left-Handed (CRLH) coplanar waveguide (CPW) antenna on AlSiMag 614 alumina substrate. The device was designed, microprocessed and tested for millimeter wave frequency range (48 GHz). Experimental results for two antenna samples show return loss of −22.72 dB at f = 47.95 GHz and −19.26 dB at f = 48.12 GHz, respectively. The −3 dB beamwidth...
The paper presents a zeroth order resonance (ZOR) Composite Right / Left-Handed (CRLH) coplanar waveguide (CPW) antenna on AlSiMag 614 alumina substrate. The device was designed, microprocessed by laser ablation and tested for millimeter wave frequency range (48 GHz). Experimental results for two antenna samples show return loss of −21.98 dB at 48.01 GHz and −20.42 dB at 48.17 GHz respectively. The...
The paper presents a zeroth order resonance (ZOR) Composite Right / Left-Handed (CRLH) coplanar waveguide (CPW) antenna on AlSiMag 614 alumina substrate. The device was designed, microprocessed by laser ablation and tested for millimeter wave frequency range (48 GHz). Experimental results for two antenna samples show return loss of −21.98 dB at 48.01 GHz and −20.42 dB at 48.17 GHz respectively. The...
A new dual band rat-race coupler with left handed transmission lines is presented in this paper. The main advantage of this novel coupler is that there are used a reduced number of cells, meanwhile the performances improve. In order to reduce the dimensions of the coupler, the 3λ/4 CRLH transmission line has been replaced with a D-CRLH transmission line, and moreover there have been introduced a new...
A new asymmetric backward coupler is obtained by edge-coupling two types of composite right/left handed (CRLH) lines. This novel coupler is analyzed in a microwave range (1-10 GHz) and the magnitude of the scattering parameters reveals tight coupling effects (even 0 dB) in a dual frequency band and also very good directivity in the working band.
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