There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Introduction to Electromagnetic Compatibility

Antenna Theory And Design

Before the emergence of ultra-wideband (UWB) radios, widely used wireless communications were based on sinusoidal carriers, and impulse technologies were employed only in specific applications (e.g. radar). In 2002, the Federal Communication Commission (FCC) allowed unlicensed operation between 3.1–10.6 GHz for UWB communication, using a wideband signal format with a low EIRP level (−41.3dBm/MHz). UWB communication systems then emerged as an alternative to narrowband systems and significant effort in this area has been invested at the regulatory, commercial, and research levels.

IEEE Transactions on Microwave Theory and Techniques and Antennas and Propagation Announce a Joint Special Issue on Ultra-Wideband (UWB) Technology

Embedding capacitive layers inside the printed circuit board (PCB) have demonstrated the ability to reduce the number of surface mount technology (SMT) chip decoupling capacitors on the PCB surface as well as greatly improve the performance of the power distribution system. Many systems today utilize this technology, but most public information is limited to data on test vehicles or emulators. This paper utilizes simulated as well as measured product data to compare the performance of the standard design to one using various types of buried capacitance layers with a reduced number of SMT decoupling capacitors. A methodology is provided that can be utilized for other designs.

Embedded Capacitor Technology: A Real World Example

Design of a MIMO antenna for high throughput WLAN applications

A transient simulation analysis is proposed for printed circuit board (PCB) power distribution network (PDN) by using physics based circuit model. The PCB PDN is divided into different blocks. Different modeling methods are used to provide physics-based circuit models for each block. Then, Hspice simulation is used to do transient simulation for the PCB PDN based on the circuit.

Transient simulation for power integrity using physics based circuit modeling

With improvement in high-density and high-speed printed circuit boards (PCBs), far-end crosstalk (FEXT) problem is one of most critical factors affecting signal quality. This is main because the spacing between adjacent signal lines becomes very small, such as the PCB routes in the fifth generation double data rate technology (DDR5). In this paper, a new method is developed for the mitigation of FEXT in DDR5. First, we investigate two cases, i.e., tabs added on the signal lines and graphene-paraffin materials coated signal lines with tabs. From the simulated S-parameters, the associated FEXT can be suppressed in a very wide frequency range (0~16GHz). Then, graphene-paraffin material is added on signal lines with tabs to further improve the performance. The FEXT can be decreased more than 12dB around 3.2GHz, compared with the traditional signal routing. It has been demonstrated by the final results in both frequency and time domains that, our structure has succeeded in mitigating FEXT in DDR5, in comparison with previous techniques. Thus, this method has a great potential in FEXT mitigation in DDR5.

Far-End Crosstalk Mitigation in DDR5 Using Graphene-Paraffin Material Coated Signal Lines with Tabs

Causality is one of the important properties for quality check of network parameters. Discrete Hilbert Transform (DHT) based delay causality checking and/or enforcing method is discussed in the present paper. DHT based causality checking/enforcing algorithm is known but is not widely used in applications. Comparison analysis between DHT based delay causality and other causality checking algorithms is given and advantage of the DHT based algorithm is discussed. Front delay is used for delay causality definition. Several methods for front delay estimation are suggested. Delay causality is checked and enforced for different test cases using the proposed methodology.

Jun Fan

Papers

Embedded Capacitor Technology: A Real World Example

Design of a MIMO antenna for high throughput WLAN applications

Transient simulation for power integrity using physics based circuit modeling

Far-End Crosstalk Mitigation in DDR5 Using Graphene-Paraffin Material Coated Signal Lines with Tabs

Discrete Hilbert Transform based delay causality enforcement for network parameters