Polymer–Ceramic Composites for Microwave Applications: Fabrication and Performance Assessment

Koulouridis, Stavros; Kızıltaş, Güllü; Zhou, Yijun; Hansford, Derek J.; Volakis, John L.

doi:10.1109/tmtt.2006.885887

Cited by 159 publications

(68 citation statements)

References 16 publications

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“…The composite has a tensile strength of 2.75 MPa with an elongation at break value of about 90%. Thus, the results indicate that the homogeneous distribution of fillers and firm interaction with the polymeric matrix are very important for the mechanical properties of composites [11][12][13].…”

Section: Resultsmentioning

confidence: 91%

Low loss flexible SrTiO3/POE dielectric composites for microwave application

et al. 2008

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Flexible, high dielectric constant and low dielectric loss composites for microwave application fabricated with SrTiO 3 (STO) ceramic filler dispersed inside a thermoplastic polyolefin elastomer (POE) polymer matrix have been studied in this paper. The dielectric property and the mechanical property of STO/POE composites filled with different volume fraction of ceramic filler were investigated. The results indicated that with the increase volume fraction of ceramic filler, both the permittivity and the dielectric loss of composites increased. Good frequency stability within a wide range was observed in all the samples. For the composites containing 40 vol% STO, the composites has a tensile strength of 2.75 MPa with an elongation of about 90% at break value. The permittivity and the dielectric loss of the composites were 11.0 and 0.01 in microwave frequency, respectively. A microstrip transmission line on the composites containing 40 vol% STO as a microwave substrate is designed and measured after bending at different angles, meanwhile the transmission coefficients of the microstrip transmission line were unchanged when bending angle is less than 60°. This indicates that the STO/POE composites have the promising characteristics for potential applications in microwave substrate, flexible dielectric waveguide and related flexible microwave devices.

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Section: Resultsmentioning

confidence: 91%

Low loss flexible SrTiO3/POE dielectric composites for microwave application

et al. 2008

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“…PDMS Composite Substrate Fabrication. Figure 2 shows the process used for fabricating the PDMS composite substrate [9,19,20]. We used Sylgard 184 (Dow Corning Corp.) PDMS and adapted the procedure described in [19,20].…”

Section: Construction Of Pdms Substrate Andmentioning

confidence: 99%

“…Figure 2 shows the process used for fabricating the PDMS composite substrate [9,19,20]. We used Sylgard 184 (Dow Corning Corp.) PDMS and adapted the procedure described in [19,20]. PDMS was chosen due to its mechanical flexibility, water resistance, and inherent chemical stability [19].…”

Section: Construction Of Pdms Substrate Andmentioning

confidence: 99%

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Design and Characterization of a Flexible Wideband Antenna Using Polydimethylsiloxane Composite Substrate

Abbas

Desai

Volakis

et al. 2018

International Journal of Antennas and Propagation

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The design and characterization of a simple, flexible wideband antenna using polydimethylsiloxane (PDMS) composite are presented. Conductive fibers are used to construct the metallic parts on a PDMS composite. To characterize the performance, two identical antennas are designed, one using the PDMS composite while the other on conventional dielectric materials. It was observed that both antennas behave well in terms of the matched bandwidth; however, the radiation towards the broadside direction is reduced when using the PDMS composite as substrate, particularly at higher frequencies. The antenna exhibits a matched bandwidth of 59.9%, ranging from 3.43 to 11.1 GHz. Moreover, the bending analysis carried out for different scenarios show that the wideband behavior of the antenna is well preserved and the variation reaches a maximum of 1% variation.

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“…It is printed on a 31 mils (0.79 mm) FR-4 substrate (εr = 4.6, tanδ = 0.016) and has dimensions La = 15 mm, Wa = 15 mm and Ha = 0.79 mm. This implanted antenna is covered with a 0.7 mm-thick polydimethylsiloxane (PDMS) layer (εr = 2.8, tanδ = 0.001 [36]). This superstrate serves to preserve the biocompatibility of the antenna by insulating its metallization from the surrounding biological tissues [37].…”

Section: B Antennas 1) Antenna Designmentioning

confidence: 99%

A High-Sensitivity Fully Passive Neurosensing System for Wireless Brain Signal Monitoring

Lee

Kiourti

Chae

et al. 2015

IEEE Trans. Microwave Theory Techn.

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Abstract-A high-sensitivity, fully-passive neurosensing system is presented for wireless brain signal monitoring. The proposed system is able to detect very low power brain-like signals, viz. as low as -82 dBm (50 μVpp) at fneuro > 1 kHz. It is also able to read emulated neural signals as low as -70 dBm (200 μVpp) at fneuro > 100 Hz. This is an improvement of up to 22 dB in sensitivity as compared to previously reported neural signals. The system is comprised of an implanted neurosensor and an exterior interrogator. The neurosensor receives an external carrier signal and mixes it with the neural signals prior to retransmitting to the interrogator. Of importance is that the implanted neurosensor is fully passive and does not require a battery nor rectifier/regulator, but is concurrently wireless for unobtrusive neurosensing with minimal impact to the individual's activity. To achieve this remarkable high sensitivity, the sensing system employed: (a) a sub-harmonic mixer using an anti-parallel diode pair (APDP), (b) a pair of implanted/interrogator antennas with high transmission coefficient, |S21|, and (c) a matching circuit between the implanted antenna and the mixer. This neurosensing system brings forward a new possibility of wireless neural signal detection using passive brain implants.Index Terms-Anti-parallel diode pair (APDP), brain implant, neurosensing, passive, wireless medical telemetry, sub-harmonic mixing.

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Polymer–Ceramic Composites for Microwave Applications: Fabrication and Performance Assessment

Cited by 159 publications

References 16 publications

Low loss flexible SrTiO3/POE dielectric composites for microwave application

Low loss flexible SrTiO3/POE dielectric composites for microwave application

Design and Characterization of a Flexible Wideband Antenna Using Polydimethylsiloxane Composite Substrate

A High-Sensitivity Fully Passive Neurosensing System for Wireless Brain Signal Monitoring

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