A novel design procedure for a compact multilayer bandpass¯lter is proposed and examined. The¯lter is realized using quasi-lumped multilayer resonators. Based on the orientation of these coupled-resonator pairs, a second-order bandpass¯lter is realized with transmission zeros. In order to achieve a low external quality factor, i.e., a wider¯lter bandwidth, di®erent types of feeder realization are considered. The design methodology with all relevant steps is presented and the equivalent-circuit of the resonator is also derived and veri¯ed. The¯lter design is simulated using a 3D electromagnetic model and validated by measurements on the fabricated lter. The simulation and experimental results are in good agreement.

Design of RF and microwave filters has always been the challenging engineering field. Modern filter design techniques involve the use of the three-dimensional electromagnetic (3D EM) solvers for predicting filter behavior, yielding the most accurate filter characteristics. However, the 3D EM simulations are time consuming. In this paper, we propose electric-circuit models, instead of 3D EM models, suitable for design of RF and microwave filters with quasilumped coupled resonators. Using the diakoptic approach, the 3D filter structure is decomposed into domains that are modeled by electric networks. The coupling between these domains is modeled by capacitors and coupled inductors. Furthermore, we relate the circuit-element values to the physical dimensions of the 3D filter structure. We propose the filter design procedure that is based on the circuit models and fast circuit-level simulations, yielding the element values from which the physical dimensions can be obtained. The obtained dimensions should be slightly refined for achieving the desired filter characteristics. The mathematical problems encountered in the procedure are solved by numerical and symbolic computations. The procedure is exemplified by designing a triple-bandpass filter and validated by measurements on the fabricated filter. The simulation and experimental results are in good agreement.

Projektovanje filtra propusnika opsega učestanosti sa kvazi-koncentrisanim rezonatorima korišćenjem zamjenske šeme DEJAN M. MILJANOVIĆ, doktorand

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Sadržaj -U radu je prikazano projektovanje višeslojnog filtra sa interdigitalno spregnutim uvodnicima. Filtar je projektovan u tehnici mikrotrakastih vodova. U radu su prikazani rezultati dobijeni u programu WIPL-D 3D EM Solver, koji su upoređeni sa rezultatima dobijenim merenjem na laboratorijskom prototipu i rezultatima dobijenim u softveru Zeland IE3D.Ključne reči -Interdigitalno spregnuti uvodnici, mikrotalasni filtar, Q-faktor, s-parametri. I. UVODAVREMENE računarske konfiguracije omogućavaju da se gotovo svi koraci prilikom izvršavanja nekog projekta mogu odraditi uz pomoć kompjuterskih simulacionih modela. CAD (Computer Aided Design) alati su postali neophodni u procesu projektovanja u savremenoj inženjerskoj praksi. Upotreba pravog softverskog paketa omogućava pregled rezultata bez izrade skupih laboratorijskih prototipa, koji su ranije bili neophodni za verifikaciju svakog koraka u projektovanju. Na ovaj način moguće je značajno smanjiti troškove i ukupnu cenu samog projekta.Softverski alati su osmišljeni tako da pruže što više informacija o razmatranom modelu, ali takođe nude mogućnost izbora parametara koje je potrebno prikazati kada su u pitanju rezultati simulacije. Cilj analize može biti dobijanje parametara rasejanja (s-parametara) ili ekvivalentnog kola za datu strukturu, ali softver takođe omogućava proračun i pregled raspodele magnetskog i električnog polja, kao i površinskih struja strukture, što u mnogome pomaže razumevanju kako data struktura funkcioniše. Softverska optimizacija može dovesti do izmene strukture u pravcu koji se ranije nije mogao predvideti, jer se algoritam za podešavanje parametara i korekciju greške odrađuje automatski. Da bi neki Ovaj rad je finansijski podržan od Ministarstvа prosvete, nauke i tehnološkog razvoja Republike Srbije u okviru projekta TR32005. Sava B. Grković, student master studija, ABSTRACT This paper presents the design of multilayer filter with interdigital feeders. The filter is designed using microstrip technology. In this paper we present the results obtained in WIPL-D 3D EM Solver, compared with the results obtained by measuring on laboratory prototype and those obtained using software Zeland IE3D.