Patent ID: 8497689
Filing Date: 2013-07-30
Classification: G01R

Abstract:
1. An active injection harmonic load pull test setup for reduced injected power comprises a signal source with two coherent output channels, independently adjustable in amplitude and phase, a device under test (DUT), a signal sampler, a source tuner and a load multi-probe harmonic tuner, a circulator, a microwave load and a signal receiver; wherein the signal from the first channel of said signal source is injected through the source tuner into the input port of said DUT and the signal exiting from the output port of the DUT is injected into the input port of said signal sampler; said signal sampler being a four-port RF component, having an input and an output port and two coupled ports which sample, in a contactless manner, a small portion of the forward and backward travelling signal power waves between said input and output ports; said signal sampler being operational at least over the frequency range between an operation frequency (fo) and the third harmonic frequency ( and wherein a small portion of the signal is sampled by said signal sampler and injected into said signal receiver; and wherein the remaining signal at the output of said signal sampler is injected into the input port of said harmonic tuner; said harmonic tuner having an input port and an output port and a slotted airline (slabline) connecting said ports and two or more metallic probes (slugs) capacitively coupled to the center conductor of said slabline, said probes being insertable into said slabline and moveable by remote control vertically approaching said center conductor of said slabline and horizontally parallel to the axis of said slabline; and wherein the output port of said harmonic tuner is connected into port and wherein the signal from the second channel of said signal source is injected into port said signal flow in said circulator is from port