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http://dx.doi.org/10.5916/jkosme.2008.32.1.147

A Study on the Fabrication of Variable Attenuator using a Diode  

Jeon, Joong-Sung (한국해양대학교 부설 산업기술연구소)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.32, no.1, 2008 , pp. 147-152 More about this Journal
Abstract
This paper has been fabricated the two different type of variable attenuators using a characteristics of a 3 dB directional coupler and pin diodes. One was not analyzed using the conventional even-odd modes but used simple two-port techniques. The resulting scattering parameters described operation characteristics for the general case where the terminating impedances are equal and unequal. After analyzing resistor role of the ${\pi}$ type fixed attenuator. this paper used a pin diode instead of a resistor. The variable attenuators were fabricated using pin diodes for current-controlled attenuation on the coupled ports of a 3 dB branch-line coupler and ${\pi}$ type fixed attenuator. The realized variable attenuators have more than 33 dB attenuation ranges at 2.1 GHz. and the input and output reflection coefficients are less than -13 dB. These results could be applied to mobile communication systems. It can be varied gain of the power amplifier according to change a outdoor environmental temperature and improved linearity.
Keywords
3 dB branch-line coupler; ${\pi}$ type fixed attenuator; Power amplifier;
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