| Scientific Breakthrough |
IN THIS PATENT DOCUMENTATION, WE PROPOSE A NOVEL DESIGN OF A SUSPENDED SUBSTRATE STRIP-LINE BAND PASS FILTER DESIGN. THE FILTER HAS A CENTRAL FREQUENCY OF 5 GHZ WITH 3.8 GHZ BANDWIDTH AND THE MAXIMUM IN-BAND INSERTION LOSS OF 0.85 DB. TWO TRANSMISSION ZEROS ARE CREATED BY THE FILTER’S PASSBAND FOR ENHANCING THE ENHANCING THE SIGNAL SELECTIVITY.
The filter has two types of modes, which are the odd mode and even mode. And four resonance modes, which are two odd modes and two even modes, are appeared in the frequency response to build its passband response. An equivalent LC circuit model is developed to emulate the filter performance and to accelerate the design procedure. Full-wave electromagnetic software is used to optimize the filter’s structure. The source-load coupling in the I/O feed design renders this filter a cross-coupling effect which creates two transmission zeros by the passband edges for the signal selectivity enhancement. These zeros are controlled by the coupling strength between the source and load. With little effort, the design of this filter structure together with the developed LC circuit model also can easily shift to other frequency range with required bandwidth. Also the circuit is based on PCB technology which has the advantages of low cost and easy of massive production. In conclusion:
1.The circuit can be easily analyzed by its developed LC circuit model which make the design easy and fast without much computational effort.
2.The planar structure and usage of printed circuit board technology of this circuit design has granted itself the advantages of low cost, low profile, and easy of mass production.
3.The introduction of implanted transmission zeros by the passband edges enhances the filter’s signal selectivity.
4.This diplexer design is very unique which is rarely seen in the literature and has been documented by a famous international journal. |
