Small Anechoic Chamber Design Method for On-Line and On-Site Passive Intermodulation Measurement

Cai, Zhanghua; Zhou, Yunfei; Liu, Lie; Qi, Yong; Yu, Wei; Fan, Jun; Yu, Ming; Luo, Qingchun

doi:10.1109/tim.2019.2937425

Cited by 11 publications

(10 citation statements)

References 36 publications

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“…As shown in Figure 3, the reflection of the absorbers is small. It is usually ignored when analyzing the reflection level of an anechoic chamber [7,28]. Thus, the absorbers can be seen just as a loss constant.…”

Section: The Methods For Evaluating the Mmg Of A Pim Measurement Chambermentioning

confidence: 99%

“…in which R AM represents the reflection ratio of the absorbing material. For the same type of absorber, R AM can be considered to be a fixed value [7,30]. Thus, it can be multiplied by Equation ( 4) as a constant.…”

Section: The Methods For Evaluating the Mmg Of A Pim Measurement Chambermentioning

confidence: 99%

“…Thus, the Friis formula is consistent with the simulation when the distance is long. The Friis formula is less accurate when the distance is short, and the simulated received power can be used to calculate the correct measurement distance d 1 using Equations ( 6) and (7).…”

Section: The Methods For Evaluating the Mmg Of A Pim Measurement Chambermentioning

confidence: 99%

“…The PIM source is generated by non-linear factors in radio frequency (RF) systems. It mainly includes contact non-linearity [4,5] and material non-linearity [6,7]. When signals of multiple frequencies are mixed into non-linear passive components, corresponding PIM signals are generated.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the shielding enclosure and absorber of the chamber could also generate PIM signals [7]. The shielding enclosure of the PIM measurement chamber is made of several metal plates, and the connections of the metal plates can be fixed by welding, screws, etc.…”

Section: Introductionmentioning

confidence: 99%

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A Method for Measuring the Maximum Measurable Gain of a Passive Intermodulation Chamber

Cai

Zhou

Liu³

et al. 2021

Electronics

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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.

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Section: The Methods For Evaluating the Mmg Of A Pim Measurement Chambermentioning

confidence: 99%

Section: The Methods For Evaluating the Mmg Of A Pim Measurement Chambermentioning

confidence: 99%

Section: The Methods For Evaluating the Mmg Of A Pim Measurement Chambermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Method for Measuring the Maximum Measurable Gain of a Passive Intermodulation Chamber

Cai

Zhou

Liu³

et al. 2021

Electronics

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A Miniaturized Anechoic Chamber: Omnidirectional Impedance Matching Based on Truncated Spatial Kramers–Kronig Medium

Luo

Liu

et al. 2022

Advanced Optical Materials

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Spatial Kramers–Kronig (KK) medium provides a new platform to achieve omnidirectionally reflectionless absorption without using any gain elements. However, impedance‐matched spatial KK media realized in previous experiments generally have flat geometries with large transverse dimensions. Realizing finite spatial KK absorbers in free space background is important for many practical applications but has not been demonstrated experimentally thus far. Here, the concept of spatial KK relation to cylindrical coordinates is extended and a double‐resonance space‐frequency KK permittivity profile is implemented in a circular geometry. Omnidirectional impedance matching to free space is achieved by truncating the spatial KK absorber at the boundary where the relative permittivity is unity. For the experimental verification, a two‐dimensional 6.6‐wavelength‐diameter doughnut‐shaped anechoic chamber is implemented using the designed spatial KK medium. The measured electric field distributions and experimental imaging confirm the omnidirectionally reflectionless property, demonstrating that this miniaturized anechoic chamber is suitable for electrically small scatterer measurements and imaging. The proposed finite spatial KK absorber and fabricated miniaturized anechoic chamber show great promises for electromagnetic shielding and compatibility.

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Corrugated horn with stable phase center for Ka‐band compact antenna test range measurement systems

Cai

Zhou

Weng

et al. 2022

Int J RF Mic Comp-Aid Eng

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In this article, a corrugated horn feed antenna with a stable phase center is designed for the millimeter wave compact antenna test range (CATR). The calculation method of the phase center of a horn is analyzed in this article.The 45 -plane phase center is used as the combined phase center of the horn in order to perform the phase center calculation only once, thus faster, and to optimize the phase performance more conveniently. By adding an absorbing material surrounding the edge of the outer surface of the horn, the irregular currents on the outer surface of the horn are suppressed, thus achieving a more stable phase center. The absorbing material can also reduce the radar cross section of the antenna. The designed corrugated horn works in the 24-40 GHz wide band with the following performances: the deviation of the phase center in the working frequency band is less than ±0.25 mm, the phase variation within a ±30 beam width is less than ±2.5 . Moreover, the measured return loss is lower than À10 dB, the measured gain is 8-12 dBi, and the measured cross-polarization level is less than À30 dB. The beamwidth is about 56 -70 in the whole band, and the beamwidth difference between different planes is less than 5 . The achieved targets listed above makes the proposed corrugated horn suitable for very precise antenna measurements in CATR systems.

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Small Anechoic Chamber Design Method for On-Line and On-Site Passive Intermodulation Measurement

Cited by 11 publications

References 36 publications

A Method for Measuring the Maximum Measurable Gain of a Passive Intermodulation Chamber

A Method for Measuring the Maximum Measurable Gain of a Passive Intermodulation Chamber

A Miniaturized Anechoic Chamber: Omnidirectional Impedance Matching Based on Truncated Spatial Kramers–Kronig Medium

Corrugated horn with stable phase center for Ka‐band compact antenna test range measurement systems

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