New configuration of Waveguide Triplexer with Frequency Multiband BPF with the Purpose of Improvement of Return Signal Losses and Diminution of Time Delay for Application of Short-band Telecommunications Radars and Optic Devices

In this paper, the design and fabrication ofWaveguide Triplexer (WT) model in 1GHz-5GHz frequencyband width, with the capability of determination of threefrequency bands (first band: 1700MHz to 2200MHZ, secondband: 2600MHz to 3100MHz, and third band: 3500MHZ to4000MHz) in Band Pass Filter (BPF) structure in the form ofa separate branch for each of the triplexer branches havebeen simulated. The purpose of this investigation is diminutionof return signal losses and improvement of signal isolationand, as well, diminution of signal time delay in multibandwaveguide triplexer filters. The technical structure ofBPF geometry has been designed in the form of rectangulargeometry of T-shaped waveguide, with regular transversecylindrical cavity configuration in radiation proportional toH-Plane and E-Plane. One of the other advantages of thisinvestigation is seen in full wave transmission with the leastsignal deviation and weakening. Also, it has application intelecommunications radars and optical devices industries.The dimensions of the proposed design are 5.99λ0*2.9 λ0,the dimensions of which have diminished. The proposeddesign has been simulated in CST Microwave Studio.