2022年8月20日 · 本文详细介绍了PCB材料的介电常数（Dk）和损耗因子（Df）的各种测试方法，包括X波段钳位带状线谐振器测试、分体式圆柱谐振器测试和微带环形谐振器测试。

The High Density Packaging (HDP) user group has completed a project to evaluate the majority of viable Dk (Dielectric Constant)/Df (Dissipation Factor) and delay/loss electrical test methods, with a focus on the methods used for speeds above 2 GHz.

There are many diferent test methods which can be used to determine the Dk (dielectric constant or εr) and Df (dissipation factor, Tan Delta, loss tangent) for circuit materials. IPC has 12 diferent test methods to determine Dk for materials.

A DK test is essential for feasibility studies when installing a new GWR in an industrial process. This post will guide you through the importance of Dielectric Constant DK testing, the procedure to measure DK, and how to interpret the results to ensure a successful GWR installation.

2022年7月6日 · 确定电路材料的Dk (介电常数，εr)和Df (损耗因数，Tanδ)的测试方法多种多样，比如IPC有12种确定材料Dk的测试方法，行业组织、大学或企业也有各自的测试方法。

“General Information of Dielectric Constants for Circuit Design using Rogers High Frequency Materials” – this paper has much more detail about the different test methods, circuit design and material interactions. Has much more Dk information from other test methods and Design Dk for different material thicknesses.

2019年5月22日 · 通过检查DK的接受态来判断G是否是确定性的。 DK-test要求每一个接受态都要包含以下内容： G通过DK-test当且仅当G是DCFG。 其中，DCFG是确定性的上下文无关文法。 文章浏览阅读359次。 内容整理自书本1。 何为DK-test？ 我们从CFG G出发，构建与之相关的DFA DK。 其中，CFG（Context Free Grammar）是上下文无关文法，DFA（Deterministic Finite Automate）是确定性的有限自动机。 通过检查DK的接受态来判断G是否是确定性的。 DK …

2019年3月30日 · It is a circuit-based test method in which 50-Ω microstrip transmission-line circuits of different lengths are fabricated on a MUT so that differences in the phase-angle measurements on the two circuits provide insights into the Dk characteristics of the MUT.

2020年2月13日 · Test methods for determining the Dk of a material under test (MUT) have been developed for the raw dielectric material, by placing it in a test fixture, and for material with conductive metal cladding, by fabricating well-characterized reference circuits on the material and performing measurements on those circuits.

What is the Driver Knowledge Test? The DKT is a test you must pass to apply for your C class (car) learner licence. To pass the test you need to answer questions about road rules and safe driving behaviour. It can be completed online or in person.