A Novel Design of Wi-Fi Band-pass Filter with Symmetrical Zeros

The basic theory of band-pass filter is introduced, and a RF WIFI band-pass filter is designed by using radio-frequency/microwave software which is named ADS on the basis of theoretical calculations and analysis. Symmetrical zeros are respectively introduced at
${2000}\mathbf{MHz}$
and
${2900}\mathbf{MHz}$
out of band to realize the rapid decline of out of band suppression, and better eliminate out of band interference and improve the anti-interference ability of the communication system. In the common frequency band range of
${2400}\sim {2500}\mathbf{MHz}$
, the standing wave ratio is
${\leq 1.21}$
, the return loss is
${> 20}\mathbf{dB}$
and the insertion loss is
${<} {1.8}\mathbf{dB}$
. It is used in Wi-Fi, Bluetooth and other communication systems, has good anti-interference ability and can improve the noise coefficient of the communication system, and can improve the communication distance of the communication system. The difference between theoretical design and simulation software design is compared. The theoretical calculation is cumbersome and complex, while the simulation software design is simple, efficient, fast and convenient for tuning. This method can be used in the design of other RF filters as low-pass RF filters and high-pass RF filters.