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Optimization of noise performance for various topologies of planar microwave active filters using noise wave techniques

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4 Author(s)
Ezzedine, H. ; IRCOM, Limoges Univ., France ; Billonnet, L. ; Jarry, B. ; Guillon, P.

In this paper, two types of microwave active filters are studied. First we show how, using a noise wave formalism, the noise factor of three topologies of active recursive filters can be effectively minimized by using appropriate unbalanced power dividers/combiners and an amplifier. A comparison between the different topologies is given. Simulations and practical results are presented and validate our approach. In a second part, the noise wave formalism is applied to λ/2 microstrip active filters. We show how the appropriate choice of coupling between lines and resonators can achieve low-noise filters. Simulations and practical results are also presented

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:46 ,  Issue: 12 )