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2 Bits MMIC Phase Shifter Improving the Phase Characteristic  

정명득 (국방과학연구소)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.40, no.9, 2003 , pp. 392-397 More about this Journal
Abstract
Reflection type phase shifter with Lange coupler is widely used as a circuit topology to obtain phase shift in broadband operation. The phase shift of 33.75$^{\circ}$ at this type is achieved by simultaneously turning on both 11.25$^{\circ}$ and 22.5$^{\circ}$ . In order to improve the phase accuracy of 33.75$^{\circ}$, this paper proposes the additional circuit which is composed of a GaAs PIN diode and a reactive load. By utilizing MMIC technology. Over the 2-6 GHz band, the measured result of phase difference between the previous circuit and the proposed circuit shows average 4.7$^{\circ}$ on the basis of 33.75$^{\circ}$. Insertion loss and return loss are invariant in comparison with the previous circuit.
Keywords
2 bits phase shifter; reflection type; MMIC;
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