Quasi-optical measurement of complex dielectric constant at 300 GHz

Stöckel, B.

doi:10.1007/bf02096378

Cited by 13 publications

(2 citation statements)

References 7 publications

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“…The DCA material is polytetrafluoroethylene (PTFE), a low-loss dielectric at 300 GHz. PTFE has a relative permittivity of 2.038 and a loss tangent of 0.0011 at 300 GHz 33 . The phase velocity of an electromagnetic wave in a dielectric is slower than that in free space; therefore, the shape of the wavefront can be changed to generate a photonic jet 34 – 36 .…”

Section: Effects Of Waveguide Flangementioning

confidence: 99%

Design and characterization of mesoscopic dielectric cuboid antenna for operation in WR-3.4 waveguide bandwidth (220–330 GHz)

Ohno,

Yabuki,

Inagaki

et al. 2023

Sci Rep

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We designed a mesoscopic dielectric cuboid antenna connected to a flangeless WR-3.4 open-ended waveguide, and the antenna characteristics at 300 GHz were examined through simulations and experiments. Simulations confirmed that the flangeless design eliminated the flange-induced ripples in the radiation pattern, whose shape varied with frequency, and that the antenna operated in the full bandwidth of the WR-3.4 waveguide (220–330 GHz). Prototypes were then fabricated based on the simulation findings. A prototype with an antenna aperture area of 1.5 mm $$\times$$ × 1.5 mm and an antenna length of 2.35 mm exhibited an antenna gain of 17.2 dBi at 300 GHz and a voltage standing wave ratio of less than 1.5 throughout the WR-3.4 waveguide bandwidth. The level of the side lobes at about $$\pm 30$$ ± 30 degrees in the E-plane pattern was approximately $$-10$$ - 10 dB that of the main lobe. Therefore, the proposed antenna, connected to a flangeless waveguide, is a promising antenna for use in future short-range high-speed terahertz wireless applications such as kiosk downloads and board-to-board communication.

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Section: Effects Of Waveguide Flangementioning

confidence: 99%

Design and characterization of mesoscopic dielectric cuboid antenna for operation in WR-3.4 waveguide bandwidth (220–330 GHz)

Ohno,

Yabuki,

Inagaki

et al. 2023

Sci Rep

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show abstract

“…The shape of a typical DCA is a cuboid with an antenna aperture size of approximately 1.2 mm × 1.2 mm and a length of approximately 1.3 mm. The material used for fabricating the DCA was polytetrafluoroethylene (PTFE) with a dielectric constant and loss tangent of 2.0 and 11 × 10 -4 at 300 GHz, respectively (Stöckel 1993). The DCA features a protruded section of 0.8 mm × 0.4 mm × 1.0 mm to allow connection with a WR-3.4 rectangular waveguide, as shown in Figure 2B.…”

Section: Characteristics Of the J-band Dcamentioning

confidence: 99%

Short-Range Wireless Transmission in the 300 GHz Band Using Low-Profile Wavelength-Scaled Dielectric Cuboid Antennas

et al. 2021

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A short-range terahertz (THz) wireless transmission in the 300 GHz band is demonstrated using low-profile wavelength-scaled dielectric transmitting and receiving cuboid antennas (DCAs). These dielectric cuboid antennas are made of polytetrafluoroethylene with dimensions of approximately 1.2 mm × 1.2 mm × 1.3 mm. The near-field pattern of a DCA at 300 GHz was measured using an electro-optic sensing technique, and its far-field pattern characterization was based on the near-field to far-field transformation. The measured antenna gain was 15.06 ± 0.06 dBi. By employing DCAs as transmitting and receiving antennas, a 17.5 Gbps data transmission rate at distances of approximately 200 and 50 mm with bit error rates of 3.31 × 10–3 and 7.51 × 10–7 respectively, is demonstrated. The proposed mesoscopic scale DCA is a promising antenna type in intra-device communications and Kiosk download applications for future mobile devices operating in the 300 GHz band.

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Obstacle-tolerant terahertz wireless link using self-healing Bessel beams

Katsuue,

Yabuki,

Morohashi

et al. 2023

Applied Physics Letters

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Wireless communications using highly directive terahertz (THz) waves exhibit lower immunity to obstructions than microwaves, limiting their applications. This study demonstrates an obstacle-tolerant THz wireless link established by a self-healing Bessel beam at 300 GHz. The Bessel beam is generated by sending a Gaussian beam through a dielectric axicon lens. Furthermore, experiments were conducted to investigate the short-range transmission (98 mm) reception characteristics with and without the dielectric cubic obstacle (7.5 λ in size) and the metallic obstacle (22 λ in length and 8 λ in width) in the Gaussian beam and self-healing Bessel beam cross sections. The maximum attenuation of the received power due to obstruction was 8.8 and 2.2 dB for the Gaussian and Bessel beams, respectively, when the dielectric obstacle is placed in the middle of the transmission path (49 mm from a transmission lens). This study further investigated the bit error rate (BER) characteristics (1 Gbps, on–off keying) with the dielectric obstacle crossing the beam cross section. When the obstacle crosses the Gaussian beam, the BER degrades as the obstacle approaches the optical axis, breaking the wireless link. In contrast, when the obstacle crosses the Bessel beam cross section, the BER is maintained at <3.8 × 10−3 (the forward error correction limit), and the wireless link is maintained. A self-healing beam, such as the Bessel beam, makes the THz wireless link more tolerant than the Gaussian beam to obstacle and expand applications for THz wireless communications.

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Quasi-optical measurement of complex dielectric constant at 300 GHz

Cited by 13 publications

References 7 publications

Design and characterization of mesoscopic dielectric cuboid antenna for operation in WR-3.4 waveguide bandwidth (220–330 GHz)

Design and characterization of mesoscopic dielectric cuboid antenna for operation in WR-3.4 waveguide bandwidth (220–330 GHz)

Short-Range Wireless Transmission in the 300 GHz Band Using Low-Profile Wavelength-Scaled Dielectric Cuboid Antennas

Obstacle-tolerant terahertz wireless link using self-healing Bessel beams

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