Abstract
This paper has been fabricated the two different type of variable attenuators using a characteristics of a 3 ㏈ 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 π 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 ㏈ branch-line coupler and π type fixed attenuator. The realized variable attenuators have more than 33 ㏈ attenuation ranges at 2.1 ㎓, and the input and output reflection coefficients are less than -13 ㏈. 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.
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