Browsing by Subject "Cavity filter"
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Item Open Access An analytical approach to the design of multiple mode rectangular cavity waveguide filters(Institute of Electrical and Electronics Engineers Inc., 2017) Kelleci, C.; Atalar, AbdullahThe multiple mode rectangular cavity structure with square corner cuts is revisited. An attempt to predict the physical dimensions of the cavity for dual mode second-order and triple mode third-order filters is made. Analytic expressions are formed to be used in the design process. The classical triple mode cavity filter structure is altered to give a finite frequency transmission zero either in the lower or upper sideband of the center frequency. The concept is illustrated with example designs. A novel additive manufacturing technique is used to fabricate a selected filter structure. The experimental results are in agreement with the expectations.Item Open Access Compact Ka-band filter applications based on the multiple mode rectangular cavity(Bilkent University, 2017-05) Kelleci, CeyhunFilters based on multiple mode cavity resonator technique have the advantage of realizing a given filter function in a reduced volume and weight with the drawback of increased complexity. In order to decrease the dependence on electromagnetic analysis software and to gain a better insight on the physics of the structure, the multiple mode single rectangular cavityfilter structure is investigated with an analytical approach. Expressions are obtained for the modal frequency shifts and for the intermodal coupling due to various types of corner cuts. An algorithm is proposed predicting the physical dimensions of thefinal structure given the corresponding coupling matrix. Example designs are realized. The algorithm is able to determine the physical dimensions of the second and third-orderfilters within a few percent. The classical triple mode rectangular cavityfilter structure is altered to form a triplet. The new triplet structure can be arranged to result in either a lower or higher sideband transmission zero. An example Ka-Band design is fabricated with both machining and a novel 3D printing technology. The results are in agreement with the expectations. Thefilter structure is further tailored to allow integration to Ka-Band waveguide output microwave modules without significant increase in the module's volume requirement.