Abstract
This paper presents an approximate method that allows the calculation of the maximum measurable gain (MMG) in an anechoic chamber. This method is realized by using a low passive intermodulation (PIM) medium-gain directional antenna. By reducing the distance between the antenna and the wall of the chamber to reduce path loss, the purpose of replacing a high-gain antenna with a medium-gain antenna is achieved. The specific relationship between distance and equivalent gain is given in this paper. The measurement interval is determined by the 3 dB beamwidth of the measurement antenna to scan the whole chamber. A set of corresponding data for the residual PIM level and the MMG of the chamber can be obtained by the method of measurement outlined herein. The feasibility of this method was verified by measurements in two PIM measurement chambers.
Highlights
IntroductionPassive intermodulation (PIM) has an important impact on wireless communication systems [1,2,3]
Analyzed during measurement, there are five interference signals in the passive intermodulation (PIM) anechoic chamber, which will increase with increases in the gain of the
As analyzed previously during the PIM measurement, theremeasurement are five interference sigto place a low-PIM, high-gain antenna in the zone, rotate the antenna scan nals in the PIM anechoic chamber, which willquiet increase with increases in the to gain of the whole sphere, and the PIM
Summary
Passive intermodulation (PIM) has an important impact on wireless communication systems [1,2,3]. The novel concept of MMG proposed in this paper is critical for the evaluation of the PIM performance of a chamber for antenna PIM measurements. The direct method of evaluating the MMG of a PIM measurement chamber is to measure corresponding high-gain, low-PIM antennas. We present here a method for evaluating the MMG of a shielded anechoic chamber with a single low-PIM medium-gain directional antenna. The beam of a medium-gain antenna has a certain directivity, and its side lobes and back lobes are small, which can clearly detect the differences in performance in different positions within the anechoic chamber.
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