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A strategy for the fast synthesis of two-port passive microwave devices with arbitrary frequency responses is proposed. It consists in approximating the coupling coefficient of some device either linearly or by means of an adaptive method, reducing the number of expensive direct calculations. An UWB pulse-shaper is shown as an example to verify the proposed methods, which are compared with the exact...
In this paper, a multipactor analysis of a new type of high-power low-pass harmonic filter in rectangular waveguide technology is performed. The filter is designed following a novel technique which permits to obtain a low-pass filtering function with suppression of the fundamental and all the higher-order modes over a wide frequency band. This is achieved by means of a smooth variation of the waveguide...
In this paper, a novel microstrip directional coupler with high directivity and coupling is proposed. It is based on the introduction of an electromagnetic bandgap (EBG) structure on the coupled lines to strongly enhance the desired backward coupling at the design frequency. The use of microstrip technology implies that the even and odd modes propagate at different speeds. This property causes a frequency...
In this paper, we present a new technique for the design of arbitrary frequency responses in the microwave range, provided that they are causal, passive and stable. A comprehensive theory development is presented starting from the coupled mode theory formalism in order to obtain an exact series solution for the inverse scattering problem. A clear physical meaning for the terms in the series is stated...
A signal processing algorithm is applied to optical spectral analyzer measurements in order to reconstruct phase response of FBGs from easy-to-obtain module data, so avoiding the use of costly and complex equipment for direct measurement of frequency response. In order to prove validity, reconstructed phase, both in transmission and reflection, is then compared to measures from three different techniques...
We introduce a novel scheme to implement tunable incoherent microwave-photonic filters with complex coefficients using optically-induced RF phase shift. A two-tap filter is experimentally demonstrated to highlight its enhanced tuning performance.
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