scholarly journals Continuous Operation of a Bragg Diffraction Type Electrooptic Frequency Shifter at 16 GHz with 65% Efficiency

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Shintaro Hisatake ◽  
Kenji Hattori ◽  
Tadao Nagatsuma
Keyword(s):  
Electric Field ◽  
Millimeter Wave ◽  
Power Efficiency ◽  
Microstrip Line ◽  
Continuous Operation ◽  
Bragg Diffraction ◽  
Frequency Range ◽  
Frequency Shifter ◽  
Modulation Signal ◽  
First Time

We demonstrate for the first time the continuous operation of a Bragg diffraction type electrooptic (EO) frequency shifter using a 16 GHz modulation signal. Because frequency shifting is based on the Bragg diffraction from an EO traveling phase grating (ETPG), this device can operate even in the millimeter-wave (>30 GHz) range or higher frequency range. The ETPG is generated based on the interaction between a modulation microwave guided by a microstrip line and a copropagating lightwave guided by a planner waveguide in a domain-engineered LiTaO3 EO crystal. In this work, the modulation power efficiency was improved by a factor of 11 compared with that of bulk devices by thinning the substrate so that the modulation electric field in the optical waveguide was enhanced. A shifting efficiency of 65% was achieved at the modulation power of 3 W.

scholarly journals Wideband millimeter wave rectangular dielectric resonator antenna for 5G applications

2020 ◽  
Vol 19 (2) ◽  
pp. 1088
Author(s):  
Abinash Gaya ◽  
Mohd Haizal Jamaluddin ◽  
Irfan Ali
Keyword(s):  
Millimeter Wave ◽  
Dielectric Resonator ◽  
Microstrip Line ◽  
High Efficiency ◽  
Axial Ratio ◽  
Radiation Efficiency ◽  
Dielectric Resonator Antenna ◽  
Frequency Range ◽  
Wide Bandwidth ◽  
Rectangular Dielectric Resonator Antenna

<span>A probe fed rectangular dielectric resonator antenna (DRA) is designed here for millimeter wave 5G applications. A wide bandwidth of 5GHz has been achieved with frequency range from 24.24GHz to 29. 20GHz. The calculated percentage banwidth is 19% centered at 26GHz. The DRA is fed by a probe with a microstrip line of unequal strip dimensions over the substrate. <br /> The measured gain of the antenna is 6.25dBi. The calculated radiation efficiency is 96%. The measured axial ratio bandwidth is from 24.08GHz to 23.90GHz, which is about 0.75 percentage bandwidth. The probe height above to the substrate is optimized to exite the DRA. The microstripline coupling is used to resonate the DRA at desizred resonating frequency. <br /> The widebandwidth with high efficiency achived here will make this antenna suitable for the 5G applications at band 30 GHz.</span>

scholarly journals Polydimethylsiloxane Elastomers Filled with Rod-Like α-MnO2 Nanoparticles: An Interplay of Structure and Electrorheological Performance

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2810
Author(s):  
Alexander V. Agafonov ◽  
Anton S. Kraev ◽  
Anastasia A. Egorova ◽  
Alexander E. Baranchikov ◽  
Sergey A. Kozyukhin ◽  
...  
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Relaxation Processes ◽  
Frequency Range ◽  
Filled Elastomers ◽  
Filled Elastomer ◽  
Mno2 Nanoparticles ◽  
Storage And Loss Moduli ◽  
Rheological Effect ◽  
First Time

For the first time, electroactive nanocomposite elastomers based on polydimethylsiloxane and filled with rod-like α-MnO2 nanoparticles have been obtained. The curing of the filled elastomer in an electric field, resulting in the ordering of the α-MnO2 particles, had a significant effect on the degree of polymer crosslinking, as well as on the electrorheological characteristics of the nanocomposites obtained through this process, namely the values of the storage and loss moduli. The dielectric spectra of filled elastomers in the frequency range 25–106 Hz were analysed in terms of interfacial relaxation processes. It has been shown, for the first time, that the application of an electric field leads to a decrease in the value of the Payne effect in composite elastomers. Analysis of the rheological effect in the obtained materials has demonstrated the possibility of designing highly efficient electrorheological elastomers that change their elastic properties by 4.3 times in electric fields of up to 2 kV/mm.

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