Halbleiter, Halbleiterbauelemente und Elektronenröhren

Zinke, Otto; Brunswig, Heinrich

doi:10.1007/978-3-642-58640-8_1

Cited by 1 publication

(2 citation statements)

References 71 publications

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“…Generally, bending causes a change in the effective length, thus introducing a change in the impedance characteristics of the antenna (i.e., mainly capacitance), causing a shift in the resonance frequency and a potential shift in the radiation pattern. Discontinuity in the shape or geometry of the antenna mainly leads to a distortion of the electric field between the patch and ground plane [11][12][13][14]. The model in Figure 2 describes the bending levels with additional capacitance, where the length L of the patch is broken up into n equal segments.…”

Section: Bending Impacts On the Parameters And Radiation Characteristics Of Flexible Antennamentioning

confidence: 99%

“…Once the comprehensive examination and verification of the properties of the selected materials are completed, the design and the shape selections for the antenna remain crucial. According to different specific applications and frequency requirements, various designs have been previously published for flexible microstrip antennas, their specific applications, and frequency requirements including aperture coupled antennas [22][23][24], planar inverted-F antennas [25,26], monopole and dipole antennas [27][28][29], various alphabetic shaped, E-shaped, F-shaped, and H-shaped antennas [14,[30][31][32], and antennas based on the CPW feed [33][34][35]. These are all microstrip antennas and fabricated on flexible substrates.…”

Section: Antenna Designmentioning

confidence: 99%

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The Impact of Bending on Radiation Characteristics of Polymer-Based Flexible Antennas for General IoT Applications

et al. 2021

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Flexible wearable wireless devices have found practical uses as their cost has fallen and Internet of Things applications have gained further acceptance. These devices are gaining further use and acceptance in the consumer and wearable space for applications such as logistical tracking and maintaining sensor information, including temperature, humidity, and location. In such applications, antennas are exposed to bending and crumbling. Therefore, flexible substrate antennas for use with polymer-based flexible devices are an important area of research that needs to be addressed. In this study, the bending capabilities of flexible polymer substrate antennas for general IoT applications were practically analyzed by fabricating flexible antennas on Polyethylene Terephthalate (PET), Polytetrafluoroethylene (PTFE) Teflon, and Polyvinylchloride (PVC) substrates operating at 2.45, 4.45, and 7.25 GHz frequencies. The basic premise was to investigate the flexibility and bending ability of polymer materials, and their tendency to withstand deformation. In the current paper, we start by providing an equivalent model for the flexible microstrip patch antenna under bent conditions, followed by outlining the process of designing flexible antennas on polymer substrates. Finally, the fabricated flexible antennas were tested in an anechoic chamber for various radiation characteristics such as reflection coefficients, operating frequency shifts, and impedance mismatch with the transmission line, under bending conditions up to 7 mm. The practical outcomes were then compared with our recent investigation on flexible polymer substrate antennas for wearable applications. This study provides a means to select a suitable polymer substrate for future wearable sensors and antennas with high bendability.

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Section: Bending Impacts On the Parameters And Radiation Characteristics Of Flexible Antennamentioning

confidence: 99%