The improvement program of RFID system microstrip directional couplers design in the UHF band.

　　The bauer coupling manufacturer tells us that the RFID system in the world has been more and more widely used, known as new technology that will gain rapid development in the twenty-first Century. The RFID system can be used in multiple bands, different frequency bands have different characteristics, the UHF band RFID system reads faster, and the identification distance is far, in recent years, it has been developing very fast. This paper will focus on improvement program of RFID system microstrip directional couplers design in the UHF band.

　　According to the bauer coupling manufacturer, we know that, In many RFID systems, there are some microwave multi-port devices, placed in a reader antenna and a signal processing module, is used for separating the output reader signal and tag scattering signal, such as a circulator, and a directional coupler. The annular volume is larger, need the ferrite materials, the manufacture cost is high, and the microstrip directional coupler's volume is relatively small, and easy to process, so it has been widely used in these systems.

　　Microstrip coupler is generally with a length of 1/4 wavelength of the coupled microstrip lines, in parallel to the two section of the conduction band are respectively coupled to the two port directional coupler, composed of four port network.

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