Abstract
The basic theory of coupler is introduced, and a tunable strip-line wideband coupler is designed by using radio-frequency/microwave software which is named ADS on the basis of theoretical calculations and analysis. The broadband coupler can be adjusted appropriately in different frequency regions by using a tunable band line. It has a wide bandwidth of 2G~4G, excellent return loss of (>30.5) dB, stable coupling coefficient of (9.85~10.81) dB, and high isolation of (>20.08) dB, the straight-through pass-band transmission coefficient of (0.41~0.62) dB. The coupler has high power tolerance and small size. It can reduce design costs by used in communication systems.
Highlights
Coupler has always been a very important part of wireless communication system
The coupler design is based on the parameters of the theoretical calculation, and get the actual coupler design parameters, but this method is very tedious and not accurate
Few can adjust the parameters of the wideband coupler
Summary
Coupler has always been a very important part of wireless communication system. It is often used for sampling microwave signals with specified flow direction, such as power monitoring and power gain control in microwave signal generator [1,2,3,4], anti-interference measurement or spurious measurement in receiver. The coupler design is based on the parameters of the theoretical calculation, and get the actual coupler design parameters, but this method is very tedious and not accurate. RF/microwave simulation software is a necessary tool for coupler design to evaluate the performance of the coupler. Aiming at the complicated way of traditional theoretical calculation and design, this paper uses ADS software to design a kind of adjustable stripline wideband coupler quickly and accurately, which saves time and design cost, and reduces the cost of communication system updating and upgrading. Aiming at the problem of poor directivity of general couplers, a tunable design method is proposed. By using this method, the directivity of couplers and other parameters are greatly improved. Using this coupler in communication system can improve the detection accuracy of communication system, and improve the communication quality and effect
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