Open AccessFrequency‐periodic microwave passive circuits and their digital matching
Author(s) -
MuñozFerreras JoséMaría,
GómezGarcía Roberto
Publication year - 2016
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2016.0169
Subject(s) - microwave , electronic circuit , computer science , redundancy (engineering) , microwave engineering , stub (electronics) , electronic engineering , low pass filter , electrical impedance , topology (electrical circuits) , filter (signal processing) , electrical engineering , telecommunications , engineering , operating system , computer vision
Frequency‐periodic microwave passive devices can be analysed in such a way that the coefficients of their digital counterparts can be extracted. In this study, this analysis procedure is exploited with the aim of providing a new theoretical framework to model these circuits, which could hopefully make their synthesis easier in the future. Interesting results observed from the application of this method to three examples of passive devices are as follows: (i) the appearance of zero‐pole cancelations (ZPCs), (ii) the explanation of the required redundancy in certain microwave structures, and (iii) some difficulties observed in the synthesis of some frequency‐periodic circuits, given a predefined digital design as a single starting point. The ZPCs appearing for the first example corresponding to a stepped‐impedance‐stub‐based lowpass filter explain its inherent structure redundancy. Next, the analysis performed for a frequency‐periodic wide‐band matching network as second example also reveals the ZPC phenomenon, which justifies the existence of difficulties in its theoretical synthesis starting from a prefixed digital design. Finally, the third example consists in the application of the procedure to the well‐known 3‐dB branch‐line hybrid, for which no ZPCs arise.