Microwave lens matching by simulated quarter-wave transformers

Morita, T.; Cohn, S.B.

doi:10.1109/iretap.1956.6366295

Cited by 47 publications

(21 citation statements)

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“…Studies on canceling internal reflection in a dielectric lens have been performed since 1954 using quarter-wave antireflection coating (Morita & Cohn, 1956). The coating works according to the principle of phase changing between the reflected waves and depends on the different refractive indices of the lens and the coating.…”

Section: Antireflection Coating Implementationmentioning

confidence: 99%

High-Performance Radiation Design of a Planar Bow-tie Antenna Combined with a Dielectric Lens and Cascaded Matching Layers at Terahertz Frequency

Apriono¹,

Aji²,

Wahyudi³

et al. 2018

IJTech

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The demand for high-speed data transmission has increased significantly in the last decades. Terahertz (THz) frequencies, which lie between 100 GHz to 10 THz, have been considered to be the solution to the demand. However, the low gain and low efficiency of a THz antenna remain issues that hinder reasonable performance for various applications. This paper proposes the design of a high-gain and high-efficiency planar bow-tie antenna for applications using THz frequencies. A planar bow-tie on a high-resistivity silicon substrate is considered in order to obtain broadband characteristics. To increase gain and efficiency, a dielectric silicon lens and a matching layer based on the quarter-wavelength are applied in the design. From simulations using Computer Simulation Technology (CST) Microwave Studio, gain and radiation efficiency of up to 32.69 dB and 90.4% are obtained, respectively. This proposed design has shown high radiation performance suitable for high-speed transmission systems.

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Section: Antireflection Coating Implementationmentioning

confidence: 99%

High-Performance Radiation Design of a Planar Bow-tie Antenna Combined with a Dielectric Lens and Cascaded Matching Layers at Terahertz Frequency

Apriono¹,

Aji²,

Wahyudi³

et al. 2018

IJTech

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“…Elements such as lens trains [1,14] or corrugated cylindrical waveguide [8] have been employed to transmit radiation with low losses over distances of several meters. In our initial design we have utilized a set of polymethylpentene (TPX) lenses with antireflection blazing [15] to transmit mm-waves from the source to the sample area. The optimal spacing of the lenses was determined by the design diameter of 28.6 mm for the guide aperture according to the criteria given by Goldsmith [14].…”

Section: Quasioptical Waveguidementioning

confidence: 99%

Quasioptical design for an EPR spectrometer based on a horizontal-bore superconducting solenoid

et al. 1999

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We describe a novel high-frequency electron paramagnetic resonance (HF-EPR) spectrometer design based on a horizontal-bore superconducting solenoid. Designs for components of a quasioptical HF-EPR spectrometer operating with a horizontal-bore 7.85 T solenoid are discussed. A rigid concentric tube construction permits precise placement and control of the optical elements in the magnet bore. A mechanically coupled, sliding optical table bearing the quasioptical bridge is another essential feature of the design. The horizontal configuration greatly improves optical alignment as well as physical access to the sample area compared to existing vertical-bore instruments. As a result, the minimum spin concentration that is detectable with an inexpensive room-temperature diode is comparable to the lowest values reported for aqueous samples in vertical-bore magnets using highsensitivity detectors.

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“…For the junction of hollow waveguide and that containing dielectric of refractive index n, a quarter wavelength transformer containing dielectric with refractive index of n is frequently used to decrease mismatches [3]. Instead of using a different medium, corrugations, arrays of small cylinders, and holes are formed on the surface of dielectric which act as if they were a medium with lower refractive indices [4].…”

Section: Introductionmentioning

confidence: 99%

Beam Expansion of Blind Spot Detection Radar Antennas Using a Radome with Defected Corrugated Inner Wall

Kim¹,

Lee²,

Cho³

et al. 2017

International Journal of Antennas and Propagation

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A beam expanding radome for 76.5 GHz automotive radar antennas is presented whose inner surface is engraved with corrugations. The radar used for blind spot detection (BSD) requires a very wide beam width to ensure longer time for tracking out-of-sight objects. It is found that the corrugations modulate the phase velocities of the waves along the surface, which increases beam width in the far field. In addition, defects in the corrugation increase beam width even further. The presented structure satisfies the beam width requirement while keeping a low profile.

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Microwave lens matching by simulated quarter-wave transformers

Cited by 47 publications

References 0 publications

High-Performance Radiation Design of a Planar Bow-tie Antenna Combined with a Dielectric Lens and Cascaded Matching Layers at Terahertz Frequency

High-Performance Radiation Design of a Planar Bow-tie Antenna Combined with a Dielectric Lens and Cascaded Matching Layers at Terahertz Frequency

Quasioptical design for an EPR spectrometer based on a horizontal-bore superconducting solenoid

Beam Expansion of Blind Spot Detection Radar Antennas Using a Radome with Defected Corrugated Inner Wall

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