Determination of Impedance Mismatch in Transmission Line using Developed TDR

A differential microwave permittivity sensor and comparator is designed using a microstrip transmission line loaded with a magnetic-LC resonator. The microstrip transmission line is aligned with the electric wall of the resonator. The sensor shows a single transmission zero, when it is unloaded or loaded symmetrically on both halves. A second notch appears in the transmission response by asymmetrical dielectric loading on the two halves of the device. The frequency splitting is used to characterize the dielectric properties of the samples under test. The sensitivity of the sensor is enhanced by removing the mutual coupling between the two halves of the magnetic-LC resonator using a metallic wall. The sensors’ operation principle is explained through a circuit model analysis. A prototype of the designed sensor is fabricated and measurements are used for validation of the sensing concept. The sensor can be used for determination of the dielectric properties in solid materials or detecting defects and impurities in solid materials through a comparative measurement with a reference sample.

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ACSS/TW aerial high-temperature bare conductors as a remedy for increasing transmission line capacity and determination of processing parameters for manufacturing

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2008.05.078 ◽

2009 ◽

Vol 30 (3) ◽

pp. 816-825 ◽

Cited By ~ 8

Author(s):

Sedat Karabay

Keyword(s):

High Temperature ◽

Transmission Line ◽

Processing Parameters

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Design Impedance Mismatch Physical Unclonable Functions for IoT Security

Active and Passive Electronic Components ◽

10.1155/2017/4070589 ◽

2017 ◽

Vol 2017 ◽

pp. 1-8 ◽

Cited By ~ 2

Author(s):

Xiaomin Zheng ◽

Yuejun Zhang ◽

Jiaweng Zhang ◽

Wenqi Hu

Keyword(s):

Transmission Line ◽

Printed Circuit Board ◽

Signal Transmission ◽

Characteristic Impedance ◽

Circuit Board ◽

Physical Factors ◽

Current Feedback ◽

Impedance Mismatch ◽

Feedback Amplifier ◽

Current Feedback Amplifier

We propose a new design, Physical Unclonable Function (PUF) scheme, for the Internet of Things (IoT), which has been suffering from multiple-level security threats. As more and more objects interconnect on IoT networks, the identity of each thing is very important. To authenticate each object, we design an impedance mismatch PUF, which exploits random physical factors of the transmission line to generate a security unique private key. The characteristic impedance of the transmission line and signal transmission theory of the printed circuit board (PCB) are also analyzed in detail. To improve the reliability, current feedback amplifier (CFA) method is applied on the PUF. Finally, the proposed scheme is implemented and tested. The measure results show that impedance mismatch PUF provides better unpredictability and randomness.

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