Techniques for the design of narrow-band (of the order of a percent or so), bandpass filters using dielectric waveguide gratings are presented. These filters use both single, uncoupled gratings and parallel-coupled configurations of gratings to form multiresonator bandpass filter structures. Transmission-line equivalent circuits are used to model the dielectric waveguide gratings. Using this model, it is then shown how direct-coupled-resonator theory can be applied to such filter structures to synthesize a prescribed passband having Chebyshev or maximally flat characteristic. On the other hand, the parallel-coupled gratings give these filters broad and strong, absorptive stopbands, as is explained. Experimental results are presented which show good agreement between theoretical and measured results.
|Pages (from-to)||681 - 689|
|Number of pages||9|
|Journal||IEEE Transactions on Microwave Theory and Techniques|
|Publication status||Published - 1986|
|MoE publication type||Not Eligible|
Ikäläinen, P., & Matthaei, G. (1986). Design of dielectric waveguide bandpass filters using parallel-coupled gratings. IEEE Transactions on Microwave Theory and Techniques, 34(6), 681 - 689. https://doi.org/10.1109/TMTT.1986.1133417