Analysis and design of low loss differential transmission line structures for high speed applications

Rotaru, Mihai; Wagih, Mahmoud

doi:10.1109/eptc.2017.8277541

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…Lossy polyimide and lossy copper models were used for the CPW model. Furthermore, as skin depth losses are significantly affected by the surface roughness [15], the roughness of the copper laminates was set to 1 µm. Figure 2 shows the simulated forward transmission of Polyimide and FR4 12 cm long CPW, verified through measurements, up to 4 GHz, of the fabricated CPW sample, showing lower losses by up to 16% at 20 GHz.…”

Section: Flexible Circuit Design and Fabricationmentioning

confidence: 99%

Flexible 2.4 GHz Node for Body Area Networks With a Compact High-Gain Planar Antenna

Wagih

Wei

Beeby

2019

Antennas Wirel. Propag. Lett.

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A flexible 2.4 GHz wireless sensor node with a bespoke single layer monopole antenna, tuned for on-body operation for wearable applications, is presented. Multiple antenna design approaches for tuning on-body antennas have been investigated. The proposed antennas, patch and meandered, designed for operation in the insole, exhibit a simulated realised gain of-3.98 dB and-1.97 dB respectively. The antennas were fabricated on a 25 µm flexible polyimide substrate, exhibiting up to 16% lower insertion losses at 20 GHz than FR4 PCBs. The integrated node incorporates a commercial Bluetooth Low Energy (BLE) system-on-chip and exhibits 9 dB higher measured gain than commercial modules with reference antenna design. Moreover, through functional radio test, it was confirmed that the designed node passes Bluetooth transmitter certification tests.

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Section: Flexible Circuit Design and Fabricationmentioning

confidence: 99%

Flexible 2.4 GHz Node for Body Area Networks With a Compact High-Gain Planar Antenna

Wagih

Wei

Beeby

2019

Antennas Wirel. Propag. Lett.

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“…The losses in a RF transmission line, and hence in an antenna, are categorized into conductor and dielectric losses. The conductor losses are a main function of the conductor's skin depth and surface roughness [6], and the dielectric losses are usually a function of the antenna's geometry [5].…”

Section: Characterising and Analysing Textile Transmission Linesmentioning

confidence: 99%

Overcoming the Efficiency Barrier of Textile Antennas: A Transmission Lines Approach

Wagih

Weddell

Beeby

2019

International Conference on the Challenges, Opportunities, Innovations and Applications in Electronic Textiles

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Designing high-efficiency antennas on textiles is fundamental for the development of wirelessly-connected smart garments. Furthermore, large antenna arrays could be used to receive or harvest directional and ambient radio-frequency (RF) power from the environment, thus enabling battery-free e-textiles. The key challenges that are hindering the realisation of high efficiency antennas lie in the dielectric properties of fabrics, the conductivity of their traces, and their low textile thickness. This work numerically and experimentally analyses different RF transmission line structures to establish the limitations of widely utilised antenna designs, such as the microstrip patch, and proposes alternative wearable antenna design based on coplanar waveguide (CPW) structures. It is demonstrated that by using a CPW, insertion losses in a 20 mm line can be minimized by up to 40% for the same substrate, as compared to a microstrip, at 30 GHz. A CPW monopole antenna is demonstrated with more than 80% efficiency on a lossy, thin, poly-cotton substrate. Moreover, it is shown that the efficiency of the CPW monopole is independent of the substrate’s thickness and type of fabric.

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Analysis and design of tightly coupled differential pairs with minimum conductor loss for high density and very high speed applications

Rotaru

Kong

Cheah

2019

2019 IEEE Asia-Pacific Microwave Conference (APMC)

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Analysis and design of low loss differential transmission line structures for high speed applications

Cited by 3 publications

References 1 publication

Flexible 2.4 GHz Node for Body Area Networks With a Compact High-Gain Planar Antenna

Flexible 2.4 GHz Node for Body Area Networks With a Compact High-Gain Planar Antenna

Overcoming the Efficiency Barrier of Textile Antennas: A Transmission Lines Approach

Analysis and design of tightly coupled differential pairs with minimum conductor loss for high density and very high speed applications

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