M. Armendariz

Publications (2)1.85 Total impact

• Source

  Available from: Kamran Entesari

  Article: A 1.2–1.6-GHz Substrate-Integrated-Waveguide RF MEMS Tunable Filter

  V. Sekar, M. Armendariz, K. Entesari
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  ABSTRACT: This paper presents a high-performance substrate-integrated-waveguide RF microelectromechanical systems (MEMS) tunable filter for 1.2-1.6-GHz frequency range. The proposed filter is developed using packaged RF MEMS switches and utilizes a two-layer structure that effectively isolates the cavity filter from the RF MEMS switch circuitry. The two-pole filter implemented on RT/Duroid 6010LM exhibits an insertion loss of 2.2-4.1 dB and a return loss better than 15 dB for all tuning states. The relative bandwidth of the filter is 3.7 ± 0.5% over the tuning range. The measured Qu of the filter is 93-132 over the tuning range, which is the best reported Q in filters using off-the-shelf RF MEMS switches on conventional printed circuit board substrates. In addition, an upper stopband rejection better than 28 dB is obtained up to 4.0 GHz by employing low-pass filters at the bandpass filter terminals at the cost of 0.7-1.0-dB increase in the insertion loss.
  IEEE Transactions on Microwave Theory and Techniques 05/2011; · 1.85 Impact Factor
• Source

  Available from: Kamran Entesari

  Conference Proceeding: Tunable SIW bandpass filters with PIN diodes

  M. Armendariz, V. Sekar, K. Entesari
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  ABSTRACT: This paper introduces a novel tunable SIW filter implemented using PIN diode switching elements. The two-pole filter provides six states ranging from 1.55 GHz to 2.0 GHz (25% tuning). Fractional bandwidth ranges from 2.3% - 3.0% with insertion loss less than 5.4 dB and return loss greater than 14 dB over the entire tuning range. Each SIW cavity is tuned by perturbing via posts connecting or disconnecting to/from the cavity's top metal layer. In order to separate the biasing network from the SIW filter, a three-layer PCB is fabricated using Rogers RT/duroid substrates.
  Microwave Conference (EuMC), 2010 European; 10/2010