Yuichi Kimura

Multi-band and wideband planar antennas are strongly desired for recent wireless applications. Microstrip antennas (MSAs) are attracted by various wireless applications due to the practical advantages of small size, low profile, light weight, and low-cost manufacturing. The authors have developed multi-ring microstrip antennas (MR-MSAs) as multiband planar antennas [1]. The MR-MSA consists of multiple ring patches arranged concentrically and an L-shaped feeding probe (L-probe) with a double-layered dielectric substrate. The MR-MSA exhibits flexible multiband design capability because the resonant frequencies can be tuned flexibly and because stable unidirectional radiation patterns are obtained. Furthermore, linear and circular polarizations can be also designed individually at the resonant frequencies. However, bandwidths of the MR-MSA become narrow when a thin dielectric substrate is used. In order to solve this problem, the authors have presented single- and dual-band MR-MSAs fed by an L-probe with a thick dielectric substrate for wideband operation [2]. The single-band and wideband ring MSA provides approximately 45% fractional reflection bandwidth of below −10 dB reflection, where a thick double-layered dielectric substrate with a thickness of approximately 0.15 wavelengths at the center frequency is used. On the other hand, a single-layer wideband ring MSA fed by an L-probe have been proposed [3]. A split ring patch and an L-probe are arranged in the same layer of a thick substrate with a thickness of approximately 0.12 wavelengths at the center frequency and approximately 30% fractional reflection bandwidth is obtained.

This paper presents measurement of a microstrip antenna array fed by longitudinal slots on a narrow wall of the rectangular waveguide with standing wave excitation for linear polarization perpendicular to the axis. A dual-ring microstrip antenna with a circumference of 5 wavelengths excited by the longitudinal slot on the narrow wall of the waveguide with a dielectric substrate is used as an element of the proposed array for grating lobe suppression due to the longitudinal slots arrayed at a spacing of one guided wavelength. In this paper, a prototype array consisting of the dual-ring microstrip antennas fed by three longitudinal slots on the narrow wall of the rectangular waveguide with standing-wave excitation is designed and fabricated. The measured results are agreed with the simulated ones obtained by HFSS. The measured radiation pattern reveals that grading lobes due to the longitudinal slots are well reduced by the proposed array. Validity of the design of the proposed array is confirmed by the measurement.

1．はじめに日本の放送の歴史は1925（大正14）年の中波のAMラジオ放送からスタートした。以来，テレビ放送，FMラジオ放送，人工衛星によるBS放送，インターネット放送（厳密には

USP9X variants have been reported in patients with X-linked intellectual disability. Here, we report two female patients with intellectual disability and pigment abnormalities along Blaschko lines. Targeted resequencing identified two novel heterozygous variants, c.4068_4072del (p. (Leu1357Tyrfs*12)) and c.1201C>T (p. (Arg401*)), in USP9X. Our findings provide further evidence that USP9X variants cause intellectual disability.

With the advent of next-generation sequencing (NGS), a blended phenotype has been shown to be caused by multilocus molecular diagnosis. Here, we present siblings of neurofibromatosis type 1 (NF1) with discordant phenotypes. Further genetic investigation revealed that the younger sister had trisomy 8 mosaicism with a low ratio and a known pathogenic mutation in the CASK gene. This is the first report of a blended phenotype caused by NF1, CASK disorder, and trisomy 8 mosaicism.

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Porencephaly and schizencephaly are congenital brain disorders that can be caused by COL4A1 mutations, though the underlying mechanism and developmental processes are poorly understood. Here, we report a patient with schizencephaly, detected by fetal ultrasonography and fetal magnetic resonance imaging, with a de novo novel mutation in COL4A1 (c.2645_2646delinsAA, p.Gly882Glu). Our results suggest that the onset of damage that potentially results in schizencephaly occurs mid-pregnancy.

We describe a novel de novo heterozygous variant in SYNGAP1 (c.1741C>T, p.R581W), identified through targeted resequencing in an 8‐year‐old boy with intellectual disability, autism spectrum disorder, distinctive dysmorphic features, and no seizures. Our data strongly suggest that the SYNGAP1 variant is causative of intellectual disability in this patient.

This paper presents basic operation of a frequency-tunable circularly-polarized ring microstrip antenna (MSA) fed by an L-probe with four varactor diodes. In order to develop a frequency-tunable circularly-polarized MSA, four varactor diodes are mounted on the corners of a square ring patch element. An L-shaped probe is arranged under the ring patch to excite the ring patch from a 50Q feeding coaxial cable. When two DC bias voltages applied for two varactor diodes on the adjacent corners of the ring patch are changed, resonant frequencies of two orthogonal modes of the ring patch can be controlled independently. Therefore, by tuning the appropriate combination of the two DC bias voltages, the frequency of circular polarization of the ring MSA can be changed. When the two DC bias voltages are changed within 0V to 8V, respectively, the measured circularly-polarized frequency with an axial ratio less than 3 dB of the ring MSA can be controlled from 3.32 to 3.59 GHz.