摘要:
An antenna element (115) of an antenna device has first and second root sections (117) and (118) and an intermediate section lying between the first and second root sections (117) and (118). A feed section (114) is provided in the first and second root sections (117) and (118). The first and second root sections (117) and (118) are arranged so as to surround the feed section (114), and are provided in a wind section (113). Tail end linear parts in the wind section (113) extend in respective opposite directions. At least one of the first and second root sections (117) and (118) has a wider width part, which is formed such that a portion that overlaps a feed line connected with the feed section (114) is larger in width than other portions. This makes it possible to realize high radiant gain and improve a VSWR characteristic for each radio wave.
摘要:
An antenna device (100) includes an antenna element (101) and an electric conductor plate (102) provided so as to face the antenna element (101). The antenna element (101) and the electric conductor plate (102) are short-circuited by a short-circuit section (104). The antenna element (101) is connected with both of external and internal electric conductors (122) and (123) constituting a feed line (121).
摘要:
A dipole antenna of the present invention is more compact and has a wider bandwidth as compared with a conventional dipole antenna. A dipole antenna (DP) includes antenna elements (E1) and (E2) on a single plane. (E1) includes a linear section (E1a) extending from an end of (E1) in a first direction, and a linear section (E1b) connected to (E1a) via a bending section (E1c), (E1b) extending from (E1c) in a direction opposite to the first direction. (E2) includes a linear section (E2a) extending from an end of (E2) in the direction opposite to the first direction, and a linear section (E2b) connected to (E2a) via a bending section (E2c), (E2b) extending from (E2c) in the first direction. (E1) and (E2) are such that (E1a) is provided between (E2a) and (E2b), and (E2a) is provided between (E1a) and (E1b).
摘要:
There is provided an optical waveguide element comprises: a core of an optical waveguide; and a Bragg grating pattern that is provided on the core, wherein a pitch of the Bragg grating pattern takes a value from among three or more predetermined discrete values; the pitches that take the respective discrete values are present in a plurality of locations over an entire length of the optical waveguide respectively; and if a value from among all of the discrete values which has the highest distribution frequency is taken as M, and if the closest value to the M which is larger than the M is taken as A, and if the closest value to the M which is smaller than the M is taken as B, then a difference expressed as A−M is equal to a difference expressed as M−B.
摘要:
A method for manufacturing a planar optical waveguide device including a core of which a top face is provided with a groove section filled with a groove section filler made of a low refractive index material having a refractive index lower than that of the core, the method including; a first high refractive index material layer forming step of forming a high refractive index material layer; a low refractive index material layer forming step of forming a low refractive index material layer made of the low refractive index material on the high refractive index material layer; a groove section filler forming step of forming the groove section filler by trimming both lateral portions of the low refractive index material layer; and a second high refractive index material layer forming step of forming a high refractive index material layer so as to fill the both sides of the lateral portions of the groove section filler.
摘要:
There is provided a planar optical waveguide element comprises a core of an optical waveguide; and first Bragg grating pattern and second Bragg grating pattern that are provided on the core, wherein the first Bragg grating pattern and the second Bragg grating pattern are mutually parallel along a propagation direction of guided light.
摘要:
An extended triangular lattice type photonic bandgap fiber, includes a cladding and a capillary core, the cladding having a plurality of holes disposed within a silica glass portion in a longitudinal direction of the fiber and arranged in an extended triangular lattice shape, the capillary core having a plurality of holes arranged in a triangular lattice shape, wherein the cross-sectional area of the respective holes in the capillary core is smaller than that of the respective holes in the cladding.
摘要:
A photonic band gap fiber is provided having multiple air holes in a silica portion extending in the longitudinal direction of the fiber. The fiber includes a cladding containing an air hole periodic structure in an extended triangular lattice configuration, wherein first rows each having a number of air holes at a first pitch are arranged alternately in the cross section of the fiber with multiple second rows of air holes each with multiple air holes at a second pitch which is twice the first pitch. The fiber further includes an air hole core.
摘要:
Provided is a reflection-type bandpass filter for ultra-wideband wireless data communication. The filter includes a substrate including a dielectric layer and a conducting layer layered on the top and bottom surfaces thereof, and a center conductor provided within the dielectric layer and serving as a strip line. A width distribution of the center conductor is non-uniform in a length direction of the center conductor.
摘要:
A reflection-type bandpass filter for ultra-wideband (UWB) radio data communications is provided. The reflection-type bandpass filter includes a substrate formed by laminating a conducting layer and a dielectric layer, and a microstrip line made of a conductor of a non-uniform width and provided on the dielectric layer. The width distribution of the microstrip line in the lengthwise direction is set such that the absolute value of the difference in reflectivity at the frequency f in the regions f 10.6 GHz and the reflectivity in the region 3.7 GHz≦f≦10.0 GHz is not less than 10 dB, and the variation of the group delay in the region 3.7 GHz≦f≦10.0 GHz is between −0.2 and 0.2 ns.
摘要翻译:提供了一种用于超宽带(UWB)无线电数据通信的反射型带通滤波器。 反射型带通滤波器包括通过层叠导电层和电介质层而形成的基板以及设置在电介质层上的由不均匀宽度的导体构成的微带线。 微带线在长度方向的宽度分布被设定为使得区域f <3.1GHz和f> 10.6GHz的频率f处的反射率的差绝对值和3.7GHz的区域的反射率<= f <= 10.0GHz不小于10dB,并且在3.7GHz <= f <= 10.0GHz的区域中的群延迟的变化在-0.2和0.2ns之间。