phase difference is attributed to the unbalanced characteristics of the varactor diodes and 3-dB couplers.
CONCLUSIONA novel and compact variable power divider based on 3-dB couplers and varactor diodes is proposed in this article. The variable power divider is initially studied using the even-and odd-mode techniques. Then, based, on the obtained equations a variable power divider operating in the frequency range 2.3-2.7 GHz was fabricated and measured. The measured results reveal that the proposed structure offers a dynamic range of minimum 6 dB, whereas the reflection losses are greater than À13 dB, regardless of the dc bias conditions. It is, however, believed that the dynamic range can be extended by using balanced varactor diodes in the circuit of the reflective loads. The proposed structure is, particularly, suitable for the implementation in the circuit of a variable input power for the Doherty amplifier, due to its inherent 90 o and continuous input power distribution.
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