摘要:
In an apparatus for measuring a specific absorption rate (SAR), a first near magnetic field distribution of a radio wave radiated from an array antenna of a reference antenna including a plurality of minute antennas is measured, and an SAR distribution with respect to the radio wave radiated from the array antenna is measured with a predetermined phantom. Then a distribution of a transformation coefficient α is calculated by dividing the measured SAR distribution by a square of the measured first near magnetic field distribution, a second near magnetic field distribution of a radio wave radiated from a measured radio communication apparatus is measured, and an SAR distribution with respect to the radio wave radiated from the radio communication apparatus is calculated by multiplying a square of the measured second near magnetic field distribution by the calculated distribution of the transformation coefficient α.
摘要:
In an apparatus for measuring a specific absorption rate (SAR) for use in a radio apparatus, a first near magnetic field of a radio wave radiated from a reference radio apparatus is measured in free space, and an SAR of the radio wave radiated from the reference radio apparatus by using a predetermined phantom according to a predetermined measurement method. A transformation factor α is calculated by dividing the measured SAR by a square value of the measured first near magnetic field, and a second near magnetic field of a radio wave radiated from a radio apparatus to be measured is measured in free space. Then an SAR of the radio wave radiated from the radio apparatus to be measured is estimated and calculated by multiplying a square value of the measured second near magnetic field by the calculated transformation factor α.
摘要:
An electromagnetic wave measuring apparatus includes a loop probe section having loop probes whose loop planes are placed so as to be perpendicular to each other, and each loop probe is placed so that its magnetic field detection space is not interfered with by other loop probes. If the loop probe section is placed at measurement position coordinates xi, yj, it detects a magnetic field component at the measurement position coordinates xi, yj, which is parallel to an XY plane, and a magnetic field component in a Z-axis direction at measurement position coordinates xi, yj−1, and repeats measurement by pitch p in a positive Y-axis direction. By calculating the root sum square of the detection results at each measurement position coordinate, a three-dimensional magnetic field level of an object to be measured can be obtained at each measurement position coordinate as electromagnetic field distribution with high-precision.
摘要:
A portable wireless unit capable of ensuring high speed, large capacity communication by lowering the correlation coefficient between antennas under various use states of a user. An antenna element (1) is arranged outside from the upper end of a case (4) on the side opposite to the display section (23) of the case, an antenna element (2) is arranged in parallel with and on the same side of the antenna element (1) while spaced apart in the width direction, and an antenna element (3) is arranged in parallel with the antenna element (1) from the display section (23) side spaced apart from the antenna element (1) in the thickness direction. The antenna element (1) is connected with a transmitter/receiver (14), and any one of the antenna element (2) or (3) is selected by controlling a high frequency switch (11) by angle information from a gravity sensor (22) and connected with the transmitter/receiver (14). A receiving signal is amplified by receiving circuits (18, 19) through the transmitter/receiver (14, 15) and then separated at a demodulating section (20) thus extracting reception information.
摘要:
The objective of the present invention is to provide a connection cable that serves as an external antenna for a radio apparatus, and whose antenna performance is not deteriorated in the use state by an adverse affect attributable to the near proximity of a human body.According to the present invention, an antenna device, integrally formed with first connection means, which is to be connected to a radio apparatus, second connection means, which is to be connected to a peripheral device, and a connection cable and an antenna element, which are located in between and which transmit a plurality of signals from the radio apparatus to the peripheral device, includes: first relay means, located at a middle position in the connection cable, for relaying the plurality of signals; the antenna element, located between the second connection means and the first relay means; and a coaxial line, located between the first connection means and the first relay means for transmitting, to the radio apparatus, an antenna reception signal that has been received at the antenna element and has been extracted by the first relay means, wherein the antenna element serves as an external antenna for the radio apparatus.
摘要:
There is disclosed a mobile telephone device capable of getting a high reception sensitivity whatever the use state is. In this device, a loop element (104) is arranged in the vicinity of a hinge unit (103) of an upper case (101). The loop element (104) is connected via a matching circuit (105) to a broadcast reception circuit (106). The device is configured so that a helical element (111) is selected in an earphone connector (109) when an earphone cable (108) is removed. A reception signal of the antenna selected by the earphone connector (109) is inputted to a broadcast reception circuit (110). Demodulation signal selection circuit (113) operates to select a demodulation signal having a higher signal quality outputted from the broadcast reception circuit (106) or the broadcast reception circuit (110).
摘要:
There is provided a mobile telephone assuring a high reception sensitivity over a wide band without deteriorating the design of the mobile telephone. In the mobile telephone, a helical antenna (4) operating as an antenna for television reception is formed by winding a conductive element along the external surface of the case several times at the upper end of the upper case (1). The helical antenna (4) is impedance-matched by a matching circuit (5) in a range of the order from 470 MHz to 700 MHz which is the television broadcast frequency. The matching circuit (5) is connected to a broadcast reception circuit (6). The broadcast reception circuit (6) operates as a reception circuit for receiving the television broadcast wave.
摘要:
The objective of the present invention is to provide a connection cable that serves as an external antenna for a radio apparatus, and whose antenna performance is not deteriorated in the use state by an adverse affect attributable to the near proximity of a human body.According to the present invention, an antenna device, integrally formed with first connection means, which is to be connected to a radio apparatus, second connection means, which is to be connected to a peripheral device, and a connection cable and an antenna element, which are located in between and which transmit a plurality of signals from the radio apparatus to the peripheral device, includes: first relay means, located at a middle position in the connection cable, for relaying the plurality of signals; the antenna element, located between the second connection means and the first relay means; and a coaxial line, located between the first connection means and the first relay means for transmitting, to the radio apparatus, an antenna reception signal that has been received at the antenna element and has been extracted by the first relay means, wherein the antenna element serves as an external antenna for the radio apparatus.
摘要:
Provided is an antenna which has a small-sized planar constitution as can be easily mounted on a small-sized radio device and which can form a principal beam having a vertical polarization in directions of low and high elevation angles.On the surface of a substrate 11, slot elements 13A and 13B having a length of about one half wavelength are arranged in parallel at a predetermined distance d1, and a reflecting plate 14 is arranged at a predetermined distance h from the mounting face of the slot elements 13A and 13B. On the back of the substrate 11, parasitic elements 15A to 15D are made of a copper foil pattern and are arrayed to intersect the slot elements 13A and 13B at right angles. A switching element 16A is connected with the parasitic elements 15A and 15B, and a switching element 16B is connected with the parasitic elements 15C and 15D.
摘要:
A portable wireless device in which, in various states where the user uses the portable wireless device, the correlation coefficient between antennas can be reduced, and high-speed and high-capacity communication can be ensured is provided.In a portable wireless device 10, from the upper end of a case on the side opposed to a side of a display portion 37 of a case 11, a first antenna element 12 which is slightly shorter by 0.05 wavelengths than the half wavelength is placed, and a second antenna element 13 in which the element length is slightly shorter by 0.05 wavelengths than the half wavelength is placed at a predetermined gap in the width direction in parallel to the first antenna element 12. The first antenna element 12 is connected to a first shared transmitting/receiving unit 23, and the second antenna element 13 is connected to a second shared transmitting/receiving unit 24. The first antenna element 12 and a first wireless circuit portion 38 connected to the element are set as a first communication system. The second antenna element 13 and a second wireless circuit portion 39 connected to the element are set as a second communication system. The communication systems operate as wireless communication systems having low spatial correlation, respectively.