摘要:
A mobile communication base station antenna has a first array antenna and a second array antenna. Antenna elements of the first and second array antennas are classified into the first, second and third groups G1, G2 and G3. A first feeding port is connected to the antenna elements in the odd number groups (the first group G1 and the third group G3) of the first array antenna and the antenna elements in the even number group of the second array antenna. On the other hand, a second feeding port is connected to the antenna elements in the even number group (the second group G2) of the first array antenna and the antenna elements in the odd number groups (the first group G1 and the third group G3) of the second array antenna.
摘要:
An LED drive circuit is provided that is connectable to a phase-control light controller and drives an LED load by use of a voltage obtained by rectifying a phase-controlled alternating current voltage inputted from the phase-control light controller. The LED drive circuit includes: a first phase angle detection portion that detects a phase angle in a present cycle; a second phase angle detection portion that detects a phase angle in a cycle preceding the present cycle by at least one cycle; a bias portion that generates a detection signal by adding a predetermined delay time to a phase angle obtained by averaging the phase angle detected by the first phase angle detection portion and the phase angle detected by the second phase angle detection portion; and a drive portion that starts current supply to the LED load at timing based on the detection signal generated by the bias portion.
摘要:
An LED drive circuit in which an alternating voltage is input and an LED is driven, and which can be connected to a phase control dimmer The LED drive circuit is provided with an edge detector for detecting an edge of the output voltage of the phase control dimmer; and a current extractor for extracting a current from a current feed line for feeding an LED drive current to the LED; wherein the value of the current extracted from the current feed line by the current extractor is varied in accordance with the detection results of the edge detector.
摘要:
An LED drive circuit that is connectable to a phase control type of light adjuster and receives a voltage based on an a.c. voltage to drive an LED load, the LED drive circuit has a structure which includes: an adjustment signal generation portion that generates an adjustment signal in accordance with a characteristic of a phase control type of light adjuster which is connected to the LED drive circuit; and an adjustment portion that receives the adjustment signal to adjust a characteristic for driving the LED load.
摘要:
A mobile communication base station antenna has two array antennas juxtaposed in a horizontal direction. Each of the array antennas includes a plurality of antenna element pairs arranged in a vertical direction. Each of the antenna element pairs includes two antenna elements having polarization characteristics perpendicular to each other. A shield plate is provided between the two array antennas. The plurality of antenna element pairs of each of the two array antennas are classified into a first group of M-antenna element pairs, a second group of N-antenna element pairs, and a third group of P-antenna element pairs from one end to another end of the two array antennas (M, N, and P are positive integers, respectively). The electric power is fed from one feeding point to the antenna elements of the first and third group of one of the two array antennas and the antenna elements of the second group of another of the two array antennas, and a tilt angle of the two array antennas with respect to a horizontal plane is set to be a predetermined tilt angle by electrical tilting.
摘要:
Disclosed is a highly reliable organic electroluminescent device, in particular, a phosphorescent organic electroluminescent device using a low-molecular-weight host material, wherein a good balance between electron and hole injection and an efficient mechanism of phosphorescence are maintained. The organic electroluminescent device contains a light-emitting layer between an anode layer and a cathode layer and the light-emitting layer comprises a phosphorescent dopant material and a host material with a molecular weight of not more than 10,000. The host material is composed of a first host material and a second host material that is different from the first host material and the first host material differs from the second host material by not more than 0.1 eV in the ionization potential (IP), by not more than 0.1 eV in the electron affinity (EA), and by not more than 0.1 eV in the triplet energy (T1).
摘要:
A document management system which can reduce the space used in a storage medium of an information processing apparatus which receives data. It is determined whether or not the resolution of image data generated by an image forming apparatus connected to the information processing apparatus managing image data via a network is higher than a predetermined resolution. If the resolution of the generated image data is higher than the predetermined resolution, the resolution of the generated image data is converted into a low resolution. The resultant image data is registered in association with log information in a storage medium, in the information processing apparatus.
摘要:
A mobile communication base station antenna has a plurality of polarization diversity antenna blocks, each of the polarization diversity antenna blocks including a plurality of polarization diversity antenna elements, each of the polarization diversity antenna elements including antenna elements that are disposed to be orthogonal to each other. The polarization diversity antenna elements of one of the polarization diversity antenna blocks are interposed between the polarization diversity antenna elements of another one of the polarization diversity antenna blocks, and tilt angles in the vertical plane of the respective polarization diversity antenna blocks are different from each other.
摘要:
A mobile communication base station antenna has a plurality of array antennas. Each of the array antennas has an antenna element pair array including a plurality of antenna element pairs arranged in a vertical plane. Each of the antenna element pairs has two antenna elements having polarization characteristics orthogonal to each other. Two feeding points are provided for feeding an electric power to the two antenna elements respectively. The array antennas are arranged in a vertical plane, and the antenna element pairs included in one of the array antennas and the antenna element pairs included in other of the array antennas are arranged alternately, at least in a part between the array antennas adjacent to each other.
摘要:
An antenna apparatus has a first antenna element and a second antenna element branched from one power feed point. The first antenna element and the second antenna element, which have different lengths, are arranged nearly in a loop as a whole with a predetermined clearance provided between distal ends thereof. The first antenna element and the second antenna element are arranged in such a way that the end faces of the distal ends thereof do not face each other with a lengthwise direction of the end face of the distal end of the first antenna element being approximately orthogonal to a lengthwise direction of the end face of the distal end of the second antenna element. Therefore, the antenna apparatus can suppress electric coupling of a plurality of antenna elements which transmit and/or receive radio waves of different frequency bands.