A Compact Microstrip T-Type Switch for Narrowband Applications

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© 2017 IEEE. This paper presents a compact T-type switch that involves three different operational states providing high flexibility in signal routing. Two of the states are between adjacent ports, while the other is a crossover state. T-type switches are mainly used as building blocks of redundancy matrices for satellite communications systems, although mobile applications also take advantage of switching devices. The proposed structure uses p-i-n diodes located in specific points to control each state with a specific bias dc voltage, creating open and short circuits. The symmetry of the structure allows even-odd mode analysis in order to obtain the design equations. To validate the concept, a compact microstrip T-type switch is fabricated and measured. The resulting device shows a good performance in terms of transmission and isolation for each state, in agreement with the simulations. The switch exhibits a band-pass response for the crossover state, while low-pass and high-pass responses result for the other two states.
Original languageEnglish
Article number8061035
Pages (from-to)170-176
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number1
Publication statusPublished - 1 Jan 2018


  • Crossover
  • four-port network
  • microstrip
  • p-i-n diode
  • switch


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