New approaches for designing microstrip filters utilizing mixed dielectrics

Elena Semouchkina, Amanda Baker, George B. Semouchkin, Michael Lanagan, Raj Mittra

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


A strategy is developed for designing capacitively loaded microstrip filters on low-temperature co-fired ceramic (LTCC) substrates with inclusions or superstrate layers of higher permittivity dielectrics. Finite-difference time-domain simulations of the field distribution at resonant frequencies are used to determine the optimal locations and size of capacitive loads. It is demonstrated that strategic capacitive load placement enables altering the center and attenuation pole frequencies, the shape and width of the passband, and input impedance of the filter by modification of selected resonant modes. Capacitive loading with higher permittivity dielectrics is shown to be very efficient in decreasing dimensions of microstrip filters with low-permittivity substrates. The designs of novel compact resonators and filters have been developed and the prototypes fabricated by using LTCC technology. The results of prototype measurements agree with the simulation results, which validates the proposed approach.

Original languageEnglish (US)
Pages (from-to)644-652
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number2
StatePublished - Feb 2005

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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