摘要:
A slot antenna apparatus includes a grounding conductor having an outer edge including a first portion and a second portion, a one-end-opened slot formed in the grounding conductor along a radiation direction such that an open end is provided at a center of the first portion, a first feed line intersecting with the slot to feed radio-frequency signals, a second feed line connected to an external circuit, and a signal processing circuit including active elements and connected between the first and second feed lines and connected to the grounding conductor. The grounding conductor is configured to be symmetric about an axis parallel to the radiation direction and passing through the slot, and is provided with a grounding terminal on the axis of symmetry at the second portion. The grounding terminal is to be connected to a ground of the external circuit.
摘要:
A photonic crystal device according to the present invention includes: a first dielectric substrate 104 having a first lattice structure, of which the dielectric constant changes periodically within a first plane; a second dielectric substrate 105 having a second lattice structure, of which the dielectric constant changes periodically within a second plane; and an adjustment device (pivot 303) for changing a photonic band structure, defined by the first and second lattice structures, by varying relative arrangement of the first and second lattice structures. The first and second dielectric substrates 104 and 105 are stacked one upon the other.
摘要:
A variable-directivity antenna according to the present invention includes at least three linear passive elements, which are arranged parallel to a Z-axis so as to surround a feed element. Each of those passive elements includes at least two element pieces, etc. that are arranged parallel to the Z-axis and switching elements, etc. of a first type. The passive element assembly further includes at least one switching element, etc. of a second type that makes two adjacent passive elements electrically continuous with each other when turned ON but electrically insulates them from each other when turned OFF. By turning ON and OFF the at least one switching element of the first type and the at least one switching element of the second type, the antenna can change its directivities. As a result, a linear variable-directivity antenna, which can change its radiation directivities within a vertical plane and of which the overall length in the longitudinal (or major-axis) direction does not increase excessively due to the presence of the passive elements, is realized.
摘要:
A slot antenna according to the present invention includes: a ground conductor 12 provided on a rear face side of a dielectric substrate 101, the ground conductor having a finite area; a slot 14 which recesses into the ground conductor 12, beginning from an open-end point on a side edge of the ground conductor 12; and a feed line 261 for supplying a high-frequency signal to the slot 14, the feed line 261 intersecting the slot 14. At a first point near the slot, the feed line 261 branches into a group of branch lines including at least two branch lines, such that at least two branch lines in the group of branch lines are connected to each other at a second point near the slot to form at least one loop line 209. A maximum value of a loop length of each loop line 209 is prescribed to be less than 1× effective wavelength at an upper limit frequency of an operating band of the slot antenna. In the group of branch lines, any branch line that does not constitute a part of the loop line 209 but terminates with a leading open-end point has a branch length which is less than a ¼ effective wavelength at the upper limit frequency of the operating band.
摘要:
The invention relates to an electrolytic capacitor having a flame retardant electrolyte and a high safety even if the electrolyte leaks out to outside, and more particularly to an electrolytic capacitor comprising a positive electrode provided with an insulating oxide layer formed through anodic oxidation, a negative electrode, a separator and an electrolyte containing a solute in an organic solvent, characterized in that the electrolyte contains not less than 3% by mass of a phosphazene derivative and/or an isomer of a phosphazene derivative.
摘要:
A pointing device includes a movement detector adapted to detect movement of an operating object, a pressure detector adapted to detect an operating pressure of the operating object, and a controller adapted to direct movement of a target object, wherein the controller controls the moving direction of the target object in accordance with the detected movement of the operating object and controls the moving speed of the target object in accordance with the operating pressure detected when the operating object is moving.
摘要:
A slot antenna according to the present invention includes: a ground conductor 12 provided on a rear face side of a dielectric substrate 101, the ground conductor having a finite area; a slot 14 which recesses into the ground conductor 12, beginning from an open-end point on a side edge of the ground conductor 12; and a feed line 261 for supplying a high-frequency signal to the slot 14, the feed line 261 intersecting the slot 14. At a first point near the slot, the feed line 261 branches into a group of branch lines including at least two branch lines, such that at least two branch lines in the group of branch lines are connected to each other at a second point near the slot to form at least one loop line 209. A maximum value of a loop length of each loop line 209 is prescribed to be less than 1×effective wavelength at an upper limit frequency of an operating band of the slot antenna. In the group of branch lines, any branch line that does not constitute a part of the loop line 209 but terminates with a leading open-end point has a branch length which is less than a ¼ effective wavelength at the upper limit frequency of the operating band.
摘要:
A differential transmission line according to the present invention includes: a substrate 101; a ground conductor layer 105 formed on a rear side of the substrate 101; and a first signal conductor 102a and a second signal conductor 102b disposed in parallel to each other on a front side of the substrate 101. The first signal conductor 102a and the ground conductor layer 105 compose a first transmission line, whereas the second signal conductor 102b and the ground conductor layer 105 compose a second transmission line. The first transmission line and the second transmission line compose a differential transmission line 102c. The differential transmission line 102c includes a curved region 104a, with a straight region 104b being connected to each end of the curved region 104a. In the ground conductor layer 105 in the curved region 104a, a plurality of slots 106a which are orthogonal to a local transmission direction of signals in the curved region 104a are formed, the slots 106a being connected to one another on the inner side of the curvature.
摘要:
A demultiplexer receives a multiplexed signal, in which a plurality of electrical signals with mutually different frequencies are multiplexed together, and divides the multiplexed signal into the electrical signals. The demultiplexer includes at least one line for propagating the multiplexed signal and a plurality of resonators arranged along the line. The dispersion characteristic of the line has a nonlinear portion, caused by electromagnetic coupling between the line and the resonators, and the phase velocities of the electrical signals which propagate through the line change according to their frequencies.
摘要:
A magnetron that includes a choke coil which is connected at one end to a cathode terminal and at the other end to a capacitor to form an LC circuit. The choke coil is made up of a first core type inductor, a second core type inductor and an air-core inductor, connected to the cathode terminal, all of which are connected in series and where the first and second core type inductors are separated by a 1 mm to 6 mm gap. The first and second core type inductors have a bar like, high-frequency absorbing member located within their respective windings.