Abstract: A vehicular communication device is mounted on a vehicle and includes antenna elements, and a wireless circuit connected to the antenna elements and performing communication with another device using the antenna elements. Each antenna element of the antenna elements has a feeding point and a feeding direction in which the antenna element extends from the feeding point. The antenna elements include two antenna elements that are separated by a distance less than a predetermined coupling distance. Feeding directions of the two antenna elements are perpendicular to each other.

Abstract: An in-vehicle electronic device includes an electronic component and a latent heat storage material. The latent heat storage material contacts the electronic component either directly or indirectly through a heat transfer member. A phase transition temperature of the latent heat storage material is between: a temperature, which is to be reached at night under a circumstance the latent heat storage material is used; and an operating upper limit temperature of the electronic component.

Abstract: A small antenna includes: a first element having a pair of conductors with a power feeding point; and a second element as a conductor arranged to sandwich a dielectric body. A part of the first and second elements has an inductance shape. A first resonance mode with a same current direction of the first element as the second element has a first resonant frequency. A second resonance mode with an opposite current direction of the first element to the second element has a second resonant frequency. A length from each power feeding point to the inductance shape is determined to hold the first resonant frequency within a range from a frequency slightly higher than the second resonant frequency to a high anti-resonant frequency of the second resonance mode, or a range from a frequency slightly lower than the second resonant frequency to a low anti-resonant frequency of the resonance mode.

Abstract: A deformed folded dipole antenna includes: a feed-side parallel part; a non-feed side parallel part arranged to be parallel to the feed-side parallel part; and a pair of short circuit portions respectively connecting to both ends of the feed-side parallel part and both ends of the non-feed side parallel part. The non-feed side parallel part includes: a pair of opposite sides that are arranged to be opposite from each other; and a connecting side that connects one ends of the pair of opposite sides together. The feed-side parallel part includes a first L-shaped portion and a second L-shaped portion. At least one of the feed-side parallel part and the non-feed side parallel part has one portion arranged with an inward protruding part, which protrudes inwardly.

Abstract: A small antenna includes: a first element having a pair of conductors with a power feeding point; and a second element as a conductor arranged to sandwich a dielectric body. A part of the first and second elements has an inductance shape. A first resonance mode with a same current direction of the first element as the second element has a first resonant frequency. A second resonance mode with an opposite current direction of the first element to the second element has a second resonant frequency. A length from each power feeding point to the inductance shape is determined to hold the first resonant frequency within a range from a frequency slightly higher than the second resonant frequency to a high anti-resonant frequency of the second resonance mode, or a range from a frequency slightly lower than the second resonant frequency to a low anti-resonant frequency of the resonance mode.

Abstract: A deformed folded dipole antenna includes: a feed-side parallel part; a non-feed side parallel part arranged to be parallel to the feed-side parallel part; and a pair of short circuit portions respectively connecting to both ends of the feed-side parallel part and both ends of the non-feed side parallel part. The non-feed side parallel part includes: a pair of opposite sides that are arranged to be opposite from each other; and a connecting side that connects one ends of the pair of opposite sides together. The feed-side parallel part includes a first L-shaped portion and a second L-shaped portion. At least one of the feed-side parallel part and the non-feed side parallel part has one portion arranged with an inward protruding part, which protrudes inwardly.

Abstract: An antenna is integrated with a solar battery. The antenna has a radiation-element portion arranged above the solar battery. The radiation-element portion is made of metallic wire rods and formed in a net-like fashion.

Abstract: In a U-shaped deformed folded dipole antenna, a first parallel section having a feeding point includes first and second L-shape sections, and a second parallel section without a feeding point includes first and second opposing side portions and a connecting side portion coupling ends of the first and second opposing side portions. Portions of the first and second L-shape sections arranged in parallel with the first and second opposing side portions have a width W1. Portions of the first and second L-shape sections arranged in parallel with the connecting side portion have a width W2. The first and second opposing side portions have a width W3. The connecting side portion has a width W4. An impedance of the deformed folded dipole antenna is controlled by setting the width W2 to be larger than the widths W1, W3, and W4.

Abstract: In a U-shaped deformed folded dipole antenna, a first parallel section having a feeding point includes first and second L-shape sections, and a second parallel section without a feeding point includes first and second opposing side portions and a connecting side portion coupling ends of the first and second opposing side portions. Portions of the first and second L-shape sections arranged in parallel with the first and second opposing side portions have a width W1. Portions of the first and second L-shape sections arranged in parallel with the connecting side portion have a width W2. The first and second opposing side portions have a width W3. The connecting side portion has a width W4. An impedance of the deformed folded dipole antenna is controlled by setting the width W2 to be larger than the widths W1, W3, and W4.

Abstract: A vehicle-mounted antenna system includes a combined antenna apparatus that has a GPS antenna and a short-range wireless communication antenna. The GPS antenna is directional in a vertical direction and the short-range wireless communication antenna is directional in a horizontal direction. The combined antenna apparatus is mounted below an instrument panel of the vehicle by a mounting bracket in such a manner that the short-range wireless communication antenna is directional in the horizontal direction toward an interior of a vehicle. This approach ensures adequate performance of the short-range wireless communication antenna and standardizes a manner in which the short-range wireless communication antenna is mounted to the vehicle.

Abstract: A planar antenna has a radiating element and a ground plate. A body of a vehicle has an internal edge that is formed by making a hole in the body. The planar antenna is located in the hole so that an imaginary plane of the internal edge is located between the radiating element and the ground plate. In such a structure, electric lines of force perpendicularly pass through the body beside the planar antenna. As a result, electric fields are maintained in the vertical direction even if the planar antenna is mounted on the vehicle. This maintains a horizontal directivity of the planar antenna.

Abstract: A vehicle-mounted antenna system includes a combined antenna apparatus that has a GPS antenna and a short-range wireless communication antenna. The GPS antenna is directional in a vertical direction and the short-range wireless communication antenna is directional in a horizontal direction. The combined antenna apparatus is mounted below an instrument panel of the vehicle by a mounting bracket in such a manner that the short-range wireless communication antenna is directional in the horizontal direction toward an interior of a vehicle. This approach ensures adequate performance of the short-range wireless communication antenna and standardizes a manner in which the short-range wireless communication antenna is mounted to the vehicle.

Abstract: An antenna device includes a ground plane, a first radiation element, and a second radiation element that is entirely disposed within the first radiation element. Of the first radiation element, a portion from a first end portion to a first bending portion electromagnetically couples with, of the second radiation element, a portion from a first end portion to a first bending portion. Further, of the first radiation element, a portion from a second end portion to a second bending portion electromagnetically couples with, of the second radiation element, a portion from a second end portion to a second bending portion. This structure enables the second radiation element to be resonant with the first radiation element.

Abstract: In an antenna unit, a radiating element and an antenna ground element are held to a dielectric member, which is primarily provided for increasing electric lines of force passing from the radiating element to the antenna ground element. The radiating element and the antenna ground element are arranged with a predetermined slant relative to a circuit board. Therefore, the number of parts or the complexity of the assembly work for the antenna unit does not increase in comparison with an antenna unit holding a radiating element with an antenna base or a bracket. Furthermore, the slant can be adjusted to any angle during the assembly work. Thus, the maximum gain angle of the directional patterns can be adjusted without increasing the size of the antenna unit.

Abstract: An antenna device includes a ground plane, a first radiation element, and a second radiation element that is entirely disposed within the first radiation element. Of the first radiation element, a portion from a first end portion to a first bending portion electromagnetically couples with, of the second radiation element, a portion from a first end portion to a first bending portion. Further, of the first radiation element, a portion from a second end portion to a second bending portion electromagnetically couples with, of the second radiation element, a portion from a second end portion to a second bending portion. This structure enables the second radiation element to be resonant with the first radiation element.

Abstract: In an antenna unit, a radiating element and an antenna ground element are held to a dielectric member, which is primarily provided for increasing electric lines of force passing from the radiating element to the antenna ground element. The radiating element and the antenna ground element are arranged with a predetermined slant relative to a circuit board. Therefore, the number of parts or the complexity of the assembly work for the antenna unit does not increase in comparison with an antenna unit holding a radiating element with an antenna base or a bracket. Furthermore, the slant can be adjusted to any angle during the assembly work. Thus, the maximum gain angle of the directional patterns can be adjusted without increasing the size of the antenna unit.

Abstract: A planar antenna has a radiating element and a ground plate. A body of a vehicle has an internal edge that is formed by making a hole in the body. The planar antenna is located in the hole so that an imaginary plane of the internal edge is located between the radiating element and the ground plate. In such a structure, electric lines of force perpendicularly pass through the body beside the planar antenna. As a result, electric fields are maintained in the vertical direction even if the planar antenna is mounted on the vehicle. This maintains a horizontal directivity of the planar antenna.

Abstract: A high-frequency amplifier has a semiconductor element for amplifying a high-frequency signal, an input matching circuit connected to an input side of the semiconductor element, and an output matching circuit connected to an output side of the semiconductor element. A stabilizing circuit is connected to at least one of a signal input path between the input matching circuit and the semiconductor element, and a signal output path between the semiconductor element and the output matching circuit. The stabilizing circuit includes a first element having a first end which is short-circuited with respect to a high frequency, a parallel resonant circuit connected in series with a second end of the first element and performing parallel resonance at an operating frequency of the high-frequency amplifier, and a second element connected to a side of the parallel resonant circuit which is opposite to the first element.

Abstract: Series reactance elements constituted by capacitors are connected to an input side corresponding to the gate electrode of an amplifying FET and an output side corresponding to the drain electrode of the amplifying FET, respectively. Parallel variable reactance circuits are connected to the input and output sides, respectively. Each variable reactance circuit includes a FET, where the source electrodes of the FET are connected to the input and output sides through MIM capacitors, respectively. Additionally, drain electrodes of the FETs are grounded through inductive loads which are constituted by spiral inductors, respectively. The source electrodes of the FETs constituting the variable reactance circuits are grounded through choke coils, respectively. The drain electrodes of the FETs receive control bias voltages through the choke coils, respectively.

Abstract: A Doppler radar speed detecting method in which periods of a Doppler signal are measured within a predetermined sampling time, and frequency data corresponding to the thus obtained period data are obtained. Upper and lower limit values are set based on the previous Doppler frequency F(k-1). The frequency data are compared with these limit values. Frequency data within a low region lower than the lower limit value, and intermedaite region between the lower and upper limit values, and a high region higher than the upper limit value are respectively counted in accordance with the comparison. Further, for the frequency data between the lower and upper limits, an integrated value of differences between these data and the previous Doppler frequency is obtained. From these integrated value and the numbers of frequency data, the change from the previous to the present Doppler frequency is calculated. By adding this change and the previous Doppler frequency together, the present Doppler frequency is obtained.