Influence Analysis of mm-Wave DUT Mounting Fixture in 5G OTA Measurement

IF 0.6 4区计算机科学 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Applied Computational Electromagnetics Society Journal Pub Date : 2021-01-01 DOI:10.47037/2021.aces.j.36094

Xudong An, Meijun Qu, Siting Zhu, Xiaochen Chen

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Abstract

─ All of the test cases in the current version of TR 38.810 in 3GPP and CTIA millimeter-Wave (mmWave) test plan are limited to the free space configuration. However, the truly free-space condition does not exist for mm-Wave testing of 5G user equipment since no device can float in the air. Mounting fixtures and supporting structures are needed to fix the device under test (DUT) and move it in two axes. The influence of mounting fixture on 5G mm-Wave wireless device performance is analyzed in this paper. First, a common 4×1 patch array at 28 GHz is simulated as the performance baseline. Various mounting fixture thickness & various spacing between the DUT and the mounting fixture are simulated to get a quick understanding of the mounting fixture’s influence on DUT performance. In different configurations, the working frequency of the antenna would have different degrees of deviation, while the gain could decrease or increase accordingly. Then, to explain these phenomena, an equivalent circuit is extracted utilizing the transmission line theory. Finally, according to the findings, it is recommended that the thickness of the mounting structure should be equal to an integer time of 0.5 λg to minimize the impact of the fixture for practical mounting structure design. Index Terms ─ 5G, effect, millimeter-wave, mounting fixture, OTA.

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毫米波DUT安装夹具对5G OTA测量的影响分析

─在3GPP和CTIA毫米波(mmWave)测试计划中，当前版本TR 38.810中的所有测试用例均限于可用空间配置。然而，5G用户设备的毫米波测试并不存在真正的自由空间条件，因为没有设备可以漂浮在空中。需要安装夹具和支撑结构来固定被测设备(DUT)并在两个轴上移动它。分析了安装夹具对5G毫米波无线设备性能的影响。首先，模拟了一个普通的4×1贴片阵列在28 GHz的性能基准。模拟了不同的安装夹具厚度和被测件与安装夹具之间的不同间距，以便快速了解安装夹具对被测件性能的影响。在不同的配置下，天线的工作频率会有不同程度的偏差，而增益也会相应的减小或增大。然后，为了解释这些现象，利用传输线理论提取等效电路。最后，根据研究结果，建议在实际安装结构设计中，安装结构的厚度应等于0.5 λg的整数时间，以最大限度地减少夹具的影响。索引术语─5G、效应、毫米波、安装夹具、OTA。

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来源期刊

Applied Computational Electromagnetics Society Journal 工程技术-电信学

CiteScore

1.60

自引率

28.60%

发文量

审稿时长

9 months

期刊介绍： The ACES Journal is devoted to the exchange of information in computational electromagnetics, to the advancement of the state of the art, and to the promotion of related technical activities. A primary objective of the information exchange is the elimination of the need to "re-invent the wheel" to solve a previously solved computational problem in electrical engineering, physics, or related fields of study. The ACES Journal welcomes original, previously unpublished papers, relating to applied computational electromagnetics. All papers are refereed. A unique feature of ACES Journal is the publication of unsuccessful efforts in applied computational electromagnetics. Publication of such material provides a means to discuss problem areas in electromagnetic modeling. Manuscripts representing an unsuccessful application or negative result in computational electromagnetics is considered for publication only if a reasonable expectation of success (and a reasonable effort) are reflected. The technical activities promoted by this publication include code validation, performance analysis, and input/output standardization; code or technique optimization and error minimization; innovations in solution technique or in data input/output; identification of new applications for electromagnetics modeling codes and techniques; integration of computational electromagnetics techniques with new computer architectures; and correlation of computational parameters with physical mechanisms.