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      Investigation of the locking bandwidth in linear and circular arrays of mutually coupled oscillators, intended for microwave power combining

      , Article IEE Proceedings: Microwaves, Antennas and Propagation ; Volume 152, Issue 6 , 2005 , Pages 441-448 ; 13502417 (ISSN) Banai, A ; Farzaneh, F ; Ayazian, S ; Sharif University of Technology
      2005
      Abstract
      An array of N weakly coupled oscillators is investigated in two major configurations. The locking bandwidth for linear and circular arrays is assessed through an array coupling matrix, in a worst-case free-running frequency distribution of oscillators. The superior locking bandwidth for circular arrays is demonstrated  

      Design and Fabrication and Parameter Extraction of Q-band Waveguide Filter with Transmission Zeros

      , M.Sc. Thesis Sharif University of Technology Pourmohammad, Sara (Author) ; Banai, Ali (Supervisor)
      Abstract
      E-plane waveguide filters are good choices due to highly manfacturing accuracy in Q-band microwave devices.To increase the attenuation slop or selectivity of such filters one need to synthesis transmission zeros with cross coupled resonators.With this method for constanst degree and return loss, attenuation slop increases in comparison to direct coupled resonators.
      In this thesis we designed and fabricated a Q-band 4th degree filter,with center frequency at 42.1746 GHz and bandwidth of 350 MHz with two transmission zeros. Results of simulations and measurments are given in chapters 3 and 5.
      Microwave filters using coupled resonators are important components in microwave systems.... 

      Design of Dual Band Filter and Miniturized De-multiplexer Using Orthogonal Modes of Resonators

      , M.Sc. Thesis Sharif University of Technology Hami Golzar, Majid (Author) ; Rejaei, Behzad (Supervisor) ; Memarian, Mohammad (Supervisor)
      Abstract
      In this paper our purpose is introducing new method for designing dual pass band filters that it can make the tuning steps easier and more determinant. This method based on matrix coupling theory. We assign a specific arrange for desired coupling matrix that it helps to our porpuse. After design any effect of matrix element has been apparent, so tune steps can be more routine. we used half cut cylinder resonators for designing dual band filter that it decrease size and mass of the filter intensily.After designing dual band filter we can transform its out put to achieve diplexer. New diplexer method also has been introduced at the end of paper  

      Using frequency coupling matrix for estimation of distribution network losses

      , Article PEDSTC 2013 - 4th Annual International Power Electronics, Drive Systems and Technologies Conferenc ; 2013 , Pages 344-348 ; 9781467344845 (ISBN) Karimi, E ; Najmi, V ; Mokhtari, H ; Sharif University of Technology
      2013
      Abstract
      Harmonic producing loads, which are increasingly used in industries, cause power quality problems as well as increase in system losses. To deal with the problems associated with harmonics and to reduce their effects on power networks, study of the effects of non-linear loads on distribution networks is essential. In this paper, the non-linear loads of residential consumers are modeled and simulated. A typical residential consumer and a simplified short feeder are simulated in order to make an estimation of the power and energy losses and their corresponding costs. The simulations are verified using practical measurements from real customers. ©2013 IEEE  

      Orthogonal-mode dual-band rectangular waveguide filters

      , Article 27th Iranian Conference on Electrical Engineering, ICEE 2019, 30 April 2019 through 2 May 2019 ; 2019 , Pages 1534-1537 ; 9781728115085 (ISBN) Golzar, M.H ; Memarian, M ; Sharif University of Technology
      Institute of Electrical and Electronics Engineers Inc  2019
      Abstract
      In this paper, we present a design method of dual-band waveguide rectangular cavity filters, with a series in-line topology. The coupling matrix is based on asynchronously tuned designs, where two sets of resonances exist for the two bands. Thus the filter is inherently different than the typical dual-band designs in the literature, as existing designs utilize resonators at the same frequency. The design at Ku band validates the underlying idea and concept, and the theory of the detuned coupling matrix. This rectangular waveguide implementation can provide noticeable miniaturization in applications with high-power requirements  
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