Del Mar Electronics & Manufacturing Show 2017 San Diego, CA - May 3-4, 2017. Booth #527 between 10:00 am - 5 pm
 

OTA生产测试

TESTxpert 是最快的、 重复性和可扩展性最好的桌面OTA测试系统,可用于定制化的生产线检测

传统的传导测试方法遇到的困难

传导测量是比较慢的,它依赖于操作人员去闭合或断开射频连接器

它是昂贵的,因为射频连接器的电缆在生产过程中将很快磨损

它没有考虑到天线对产品性能的影响。对于无线设备,天线对整个系统性能而言是很关键的部分。所以,这个测试减少了一个大问题。

许多新的设计甚至没有射频连接器。所以这个测试不得不被完全取消,而用OTA测试来代替

传统OTA产品测试方法遇到的困难

耦合板的路径损耗是非常不精确的。待测天线位置的微小变化可以在该路径损耗值中产生极大的不确定性

它每次都必须根据被测试的设备进行调整。如果被测设备的设计发生变化,耦合板就必须被改变,每次一种新设备上线时,都不得不重新设计和调整耦合板。这往往需要花费几周到几个月的时间去完成。

目前几乎没有能满足生产线测试所需的 +/-2dB 精度的耦合板。

OTA 测试的是天线参数,一个设备中有多个天线,每个天线都需要一个独立的耦合元件。某些设备有 7个以上的 天线,这意味着你至少需要有 7个 耦合元件或 7种 耦合补偿因子。每个元件或补偿因子都要单独设计和调试,这将使整个过程更长

传统的全程质量控制测试所遇到的困难

需要经常将产品送到暗室里测试,既慢又贵。

每个产品需要测试几分钟到几十分钟,如果你想要测试大量的正在生产的设备,这将是非常漫长的过程,必然会延迟产品的发布。

必须要有一名受过训练的操作员,这意味着它不能在产线环境中进行。

TESTxpert:
关于OTA测试的新尝试

TESTxpert 是在我们已取得广泛应用的产品—RFxpert的基础上开发出来的产品

RFxpert 是一款成熟产品,在全世界被广泛用于无线产品的研发与设计 (RFxpert 的部分客户清单见右侧的列表)。

TESTxpert: 技术

testxpert_probe_layout 在耦合板上高密度排列的探头效率很低,这意味着他们对位置的变化和背景的噪声都不敏感。

耦合板不需要为每个特殊的模型去重新设计;只需要选择合适的探头去确保最佳的耦合性能。一旦探头的效果被每个被测天线接受,那它对每个相同型号的被测设备都是一样的。

在这项技术中,路径损耗被很好的研究和控制,耦合效应被充分理解。

TESTxpert: 这个概念

testxpert-_phone_3_c

用耦合板做测试的测试盒,需要待测产品的位置非常精确,而用Testxpert,我们只需要把待测产品简单地放在表面上。

TESTxpert 是由探头阵列组成。每个格子对应一个探头。待测产品下面的 探头将作为耦合元件用于 OTA 测试

被测产品被放置在探头阵列上。其中不同的天线元件会放置在某几个探头上,这几个探头便可以被选为对应手机天线的最佳耦合路径。

TESTxpert 的灵活性: 无需改变测试装置,便可以测试不同型号、 不同的频率的设备

TESTxpert 是适用于所有产品型号的通用测试设备

当你测试不同的工艺,不同的频率和不同的天线时,天线阵列传感器可以简单地切换到一组新的近场探头并提供新的耦合路径。

所以即使被测产品型号发生变化。或是天线位置发生变化,同样的探头阵列可以通过重新动态编辑来进行测试

当你在不同型号间切换时,你只需简单地改变了一下探头阵列的编排。如果你想转换到一个新的工艺或者新的频率,也没关系,这些探头的频段范围为 300 MHz至 6 GHz,不需要重新调整

所以这给你带来难以想象的灵活性,可以适应同一生产线上的不同型号产品和不同天线的测试。

TESTxpert 是可靠和可重复的: 时间将证明您的产品线

目前的OTA 测试方案遇到的最大问题是实际的路径损耗具有很大的不确定度。而TESTxpert的 耦合路径有极大的可重复性,误差仅为+ /-0.5 dB,由于位置错误所带来的影响几乎可以忽略不计。这意味着即使一个不合适的定位设备也不会对测量精度造成很大影响。

positional_error_c

 

reduced_false_positive_negative

高测量精度有助于降低”通过/失败”测试的门槛,极大地降低错误肯定和错误否定。直接的好处是更少的不合格产品被送到最终用户手中,同时更少的合格产品被返工。

TESTxpert 清晰显示你的当前参数测试

在 TESTxpert中探头被选定后,它的操作方法和你现有的OTA耦合板一样,不需要对测试设备和测试计划作任何改变。

TESTxpert 处理复杂的带有 MIMO 天线的设备

你可以将并行 OTA 路径集成在同一个的 TESTxpert 阵列中,可以同时测试多个天线,符合更复杂的测试需求

TESTxpert 结果: 媲美传统的传导测量方式

用 TESTxpert进行OTA 测量时,变动与传导模式的几乎一样小,比传统的 OTA 测试设备好得多。

conducted_test_comparison_c

evm_repeatability_c

TESTxpert将为你的生产线增加新的能力

TRP: 绝对辐射功率测量精度可达 1.6 dB,相对辐射功率测量精度可达 + /-0.5 dB

Pattern: 方向图:快速的“通过/失败”方向图比对,对具有波束赋形等功能产品的设计非常重要

Dynamic effects: 动态影响:使用配有头手模型TESTxpert,可在产线上评估人体对被测产品的影响

Tuneable antennas: 可调谐天线:非常快的测量能力可以帮助你验证天线被调到预期的频率

Why RFxpert Is Right For You

You want to avoid the delays and set-up needed for far-field measurements in a chamber.

RFxpert not only require low CAPEX and zero OPEX, they also deliver significant ROI advantages.

You can execute real-time analysis of your design, test multiple design iterations and optimize complex designs on your lab-bench in seconds at each stage of the design process.

Key Benefits

Test results in seconds
Easy to use
Compact and tabletop
Significant time-to-market acceleration
Dramatic increase in production
Substantial cost reduction

Read More

Are you under time-to-market pressure because of the countless number of lengthy measurements in inaccessible anechoic chambers?

Tired of losing valuable project time waiting in line to test your designs in expensive anechoic chambers?

Do you want to test your design and performance quickly to accelerate project completion and delivery?

Are you under budget pressures?

Why did your product fail the compliance test in an anechoic chamber? Why didn’t you see this coming?

With RFxpert, in seconds and a fraction of an anechoic chamber cost you can easily:

  • Analyze your embedded antenna and wireless device designs
  • Prototype / test new designs, components, and forms
  • Iteratively test and optimize embedded antenna designs
  • Perform highly repeatable and rapid over-the-air wireless device measurements
  • Verify final product performance in real-time
  • Gain immediate insight into the root causes of performance issues by analyzing the near-field results

…all for a fraction of the cost of an anechoic chamber.

  •   How does RFxpert work?

    rfxpert-how-does-it-workRFxpert measures the magnetic field (H-Field) in two orthogonal directions using H-field probes and projects this data to the far-field using the planar aperture distribution to angular spectrum transformation or plane wave spectrum (PWS) transformation.

    A second custom algorithm then adjusts the far-field projection to eliminate the predictable coupling effects of the measurement array of probes. Probe response compensation is also taken into consideration in this algorithm.

    EMSCAN meticulously developed this custom algorithm through comprehensive and rigorous R&D efforts to get the most accurate test results.

Companies Who Trust RFxpert Products
What Our Customers Are Saying
“I prefer to use the RFxpert for my antenna design projects instead of simulation software. In a couple of hours, I can model a real antenna out of copper and test it with the RFxpert in the antenna’s intended operating environment. I then use the proven design, based on the RFxpert analysis, to prepare a CAD drawing and send it off to manufacturing for prototyping.”
Jorge I. Ortiz
RF Network & Antenna Engineer, Independent Consultant at Mueller Systems Ocala, Florida Area
“We're impressed with the accuracy of the RFX scanner compared to our external lab measurements for TRP.”
Jeremy Monroe
MoJoose Inc
“We wanted to extend the distance between the hand-held transmitter and the aerial device. Initially we thought that we had to add an additional power amplifier stage. The RFxpert showed us that the real problem was something else: the coax was radiating as much as the antenna. By using better coax and a different coupling method from the final power amplifier stage to the antenna, we were able to transfer more power to the antenna. We managed this significant increase by almost zero cost to the design.”
Director of Engineering
Consumer Electronics Manufacturer
“Designers now evaluate designs in real-time vs. waiting at the back of the queue with $100M+ projects in front”
RF Design Engineer
Leading Military Subcontractor

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