VSWR detection and protection programs prototype circuit design and testing

VSWR detection and protection programs prototype circuit design and testing, this option is adopted, HPA, VSWR> 15:1 VSWR> 4:1 the failure can still work.Transmission line voltages and currents are linked by a specific ratio, the ratio relationship is commonly referred to as the characteristic impedance (ZO). If the signal source is added to the impedance of the size as the characteristic impedance of the load, then all the power is delivered to the load. Any mismatch will cause the load impedance of the transmission line is changed, thereby causing the reflective current and voltage of the transmission line.

 thereby generating a standing wave. The laptop battery incident and reflected wave interference occurs and destructive interference, resulting in a shown in Figure 1 the maximum value (Vmax) and the minimum value (Vmin). VSWR i.e. describe the parameters of the mismatch, which is defined as the ratio of the Vmax and Vmin Vmax / Vmin.the transmitter signal to receive partially saturated, or cause the radio to overheat. The more serious impact damage to the transmitter and breakdown the transmission dielectric.The detection accuracy of the method will determine the accuracy of the VSWR measurement.

Ideal impedance matching (VSWR = 1:1) allows power lossless transmission, and severe impedance mismatch (VSWR) will cause the transmission to the load power is reduced. High VSWR may cause a variety of system problems, which are the most sensitive to VSWR is the PA preceding the antenna. High VSWR may cause to reduce the operating range of the radio device,  Reflected again at the power amplifier due to the signal reflected back to the antenna, and then re-emitted, resulting in a phenomenon similar to the multipath, and therefore high VSWR may cause the shielding fading of the television broadcasting system.

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