Zaghlou, A., El-Awady, R., Kamel, S., Mahfouz, S. (2009). Simplified Analysis and Applications of Single Mode Active Directional Coupler with Parallel Electrodes. test, 19(1), 47-62. doi: 10.21608/mjeer.2009.65239
Adel l Zaghlou; Rasheed El-Awady; Sayed Kamel; Sohair Mahfouz. "Simplified Analysis and Applications of Single Mode Active Directional Coupler with Parallel Electrodes". test, 19, 1, 2009, 47-62. doi: 10.21608/mjeer.2009.65239
Zaghlou, A., El-Awady, R., Kamel, S., Mahfouz, S. (2009). 'Simplified Analysis and Applications of Single Mode Active Directional Coupler with Parallel Electrodes', test, 19(1), pp. 47-62. doi: 10.21608/mjeer.2009.65239
Zaghlou, A., El-Awady, R., Kamel, S., Mahfouz, S. Simplified Analysis and Applications of Single Mode Active Directional Coupler with Parallel Electrodes. test, 2009; 19(1): 47-62. doi: 10.21608/mjeer.2009.65239

Simplified Analysis and Applications of Single Mode Active Directional Coupler with Parallel Electrodes

Menoufia Journal of Electronic Engineering Research
Article 2, Volume 19, Issue 1, January 2009, Pages 47-62
Document Type: Original Article
DOI: 10.21608/mjeer.2009.65239
Authors
Adel l Zaghlou1; Rasheed El-Awady2; Sayed Kamel1; Sohair Mahfouz1
1Electronics & Communications Engineering Dept, Faculty of Eng., Zagazig University, Egypt.
2Electronics & Communications Engineering Dept., Faculty of Eng., El-Mansoura Univ., Egypt.
Abstract
In this work, a method of analysis for directional coupler device is proposed.   Normally, directional coupler operates at lower values of normalized frequency "Vx". So, the corresponding normalized propagation constant "bx" becomes approximately in logarithm to relation to Vx.  Therefore, the simplified model is used to find the propagation constant, coupling coefficient and their changes with the controlled voltage.  As illustrative applications, the proposed method is applied to the power divider/combiner ratios, the bandpass wavelength filter and three waveguides directional coupler. The analysis of the electro-optically controlled directional coupler becomes simple with more evidence and very good agreement. The effect of the controlled voltage on the coupling coefficient is very weak so, the output power of the directional coupler is affected by the change of propagation constants (i.e. by the controlled voltage).
References
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