|Title||Development of waveguide filter structures for wireless and satellite communications|
This thesis explores the possibilities of the design and realization of compact conventional and substrate integrated waveguide structures with improved performance taking advantage of recent cross-coupled resonator filters theory achievements such as the modular filter design approach using non-resonating nodes and inline extracted pole filters. Therefore, the core of the thesis presents the following stages of work:
-- Solution of electromagnetic problem for wave propagation in rectangular
waveguide structures; overview of substrate integrated waveguides.
-- Review of available design procedures for cross-coupled resonator filters;
realization of coupling matrix synthesis methods by optimization.
-- Investigation of the possibility to implement filtering modules using E-plane metallo-dielectric inserts in conventional rectangular waveguides. Application of the modules in configurations of bandpass and dual-band filters. Experimental
verification of the filters.
-- Implementation of inline extracted pole filters using E-plane inserts in
rectangular waveguides. Use of generalized coupling coefficients concept for
individual or coupled extracted pole sections. Development of new extracted
pole sections. Application of the sections in the design of compact cross-coupled filters with improved stopband performance.
-- Application of the techniques developed for conventional rectangular
waveguides to substrate integrated technology. Development of a new negative
coupling structure for folded substrate integrated resonators. Design of improved modular and extracted pole filters using substrate integrated waveguides.