PIM-linearity improvement by the size of a diode mounting hole

概要

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A new method for the dynamic range enhancement of the PIM-producing patch antenna with diode is proposed, and its effectiveness is verified by experiment. In 2GHz-band experiment, we shows that the size reduction of the diode-mounted hole has an equivalent effect of the diode-rotation in the previous work, and contributes to the linearity improvement in the high power excitation. Through the testing result of 800MHz-band antenna, it is demonstrated that good linearity is obtained up to 43dBm excitation in swept-power test when Dh=4.6mm. The frequency characteristics of the employed diode are also verified through a frequency-swept test. The resultant PIM-level variation is less than 2dB, which is negligibly small in comparison with the difference between 800MHz- and 2GHz-antennas.