Quasi-static analysis of an optically illuminated directional coupler

Safwat, Amr M. E.; Khalil, Diaa; El‐Hennawy, Hadia; Ragaie, H.F.

doi:10.1109/22.618434

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…43 Ω. Using these values a simulation of the circuit with lossy transmission lines, but without considering interconnection effects can be carried out using the Monolithic Microwave Integrated-Circuit Analysis and Design (MMICAD) simulator (Safwat et al, 1997). The analysis of the differences between the constructed and the simulated coupler is very interesting, and may help the students to understand the behavior of the circuit.…”

Section: Prototype Construction and Its Analysismentioning

confidence: 99%

An Experience to Include Advanced Optimization Techniques in Microwave Undergraduate Laboratories

López-Espí¹,

Salcedo‐Sanz²,

Sánchez-Montero³

et al. 2010

Proceedings of the 2nd International Conference on Computer Supported Education

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In this paper, a method to introduce advanced computational optimization techniques in undergraduate laboratory subjects is presented. The experience proposed consists in using evolutionary algorithms to design a microwave device (a directional coupler in this case), and then constructing a prototype following the outcome of the algorithms. The idea is to present the undergraduate student advanced techniques that it is unlikely they study in their degree, but which may be useful for them in postgraduate courses. The results of the application of the experience in the subject Antennas and

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Section: Prototype Construction and Its Analysismentioning

confidence: 99%

An Experience to Include Advanced Optimization Techniques in Microwave Undergraduate Laboratories

López-Espí¹,

Salcedo‐Sanz²,

Sánchez-Montero³

et al. 2010

Proceedings of the 2nd International Conference on Computer Supported Education

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“…When a semiconductor is illuminated with a photon of the appropriate wavelength,an electron-hole pair is generated in the semiconductor substrate creating a variable load that changes the propagation characteristics in the microwave device. This change in characteristics has applications such as in tunable filters [2], phase shifters [3], and microwave matching techniques [4]. One of the new promising applications of microstrip technology is the optically controlled microwaveattenuators [5].Such optical control is based on the fact that when photons of energy greater than the band gap are incident on the silicon substrate, electron-hole plasma created by light absorption [6].…”

Section: Introductionmentioning

confidence: 99%

Optically Controlled Coupled Microstripline Microwave Power Attenuator

Tomar¹,

Sharma²,

Verma³

2014

IOSRJEEE

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This paper presents an optically controlled coupled microstripline microwave powerattenuator on a high resistivity silicon substrate in the 3GHz-7GHz frequency band. The structure is based on the10dB microstrip directional coupler. Attenuation control is performed by optical control of the open end resistances. The open end act as a variable resistance under sufficient optical illumination conditions. The attenuator has been designed for 10dB and 25dB attenuation control for one-port and two port optical illuminations respectively. The analysis has been carried out for one port illumination using a 30mW, 850nm laser diode and two ports illumination using two 20mW, 650nm laser diode. The attenuator has been modeled by the Computer Simulation Technique's Micro Wave Studio (CST MWS) 3D EM simulator. At 5GHz, the structure provides a continuous variation of S41 between 0 and 25dB with both open end illumination.

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“…Si l'éclairement est judicieusement choisi au sein d'un composant microondess en technologie microruban ou coplanaire, la propagation d'une onde hyperfréquence dans ce composant est modifiée. On obtient ainsi des composants accordables optiquement, atténuateurs variables [1], filtres accordables [2], adaptateurs d'impédance [3], déphaseurs [4]. Le recours au contrôle optique trouve son intérêt dans la mesure où il n'est pas limité en fréquence, contrairement aux charges variables actuelles telles que les diodes ou les capacités varactors.…”

Section: Introductionunclassified