Source: http://www.google.com/patents/US8073407?dq=7,172,682
Timestamp: 2017-07-29 12:29:22
Document Index: 300657993

Matched Legal Cases: ['art) 120', 'art 130', 'art 130', 'art 120', 'art 120', 'arts 120', 'arts 120', 'art 120', 'art 120', 'art 130', 'arts 130', 'art 120', 'art 120', 'Application No. 2007']

Patent US8073407 - Radio communication device and power supplying method for radio ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA radio communication device in which the output transmission signal of a high-frequency power amplifying part is sent out to an antenna via a circulator, a high-frequency signal reflected from the antenna is transferred via the circulator to a rectifying part to obtain a direct current power, and the...http://www.google.com/patents/US8073407?utm_source=gb-gplus-sharePatent US8073407 - Radio communication device and power supplying method for radio communication deviceAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS8073407 B2Publication typeGrantApplication numberUS 12/108,087Publication dateDec 6, 2011Filing dateApr 23, 2008Priority dateApr 27, 2007Fee statusPaidAlso published asCN101295887A, CN101295887B, EP1986335A2, EP1986335A3, EP1986335B1, US20080268796Publication number108087, 12108087, US 8073407 B2, US 8073407B2, US-B2-8073407, US8073407 B2, US8073407B2InventorsAtsushi Fukuda, Hiroshi Okazaki, Shoichi NarahashiOriginal AssigneeNtt Docomo, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (19), Non-Patent Citations (1), Classifications (6), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetRadio communication device and power supplying method for radio communication device
US 8073407 B2Abstract
It is an object of the present invention to provide a radio communication device capable of operating a high-frequency power amplifier in an optimum state and having high power utilization efficiency.
FIG. 1 shows a functional construction of a radio communication device according to a first embodiment;
Description will be made below for the embodiments of the present invention. Note that the same reference numbers are applied to constituent parts having the same function and duplicate description may be omitted.
FIG. 1 shows the functional constitution example of those parts related to the present invention of the radio communication device of the first embodiment. A radio communication device 100 has an antenna 110, a high-frequency power amplifying pail (hereinafter, also simply referred to as an amplifying part) 120 that supplies a transmission signal to the antenna 110, a rectifying part 130 that converts a high-frequency signal power into a direct current power, a circulator 140, a signal source 150 that generates a transmission signal, and a power supply unit 160.
The above-mentioned description shows an example using the output current of the rectifying part 130 as an aid to power supply to the amplifying part 120 for transmitting a high-frequency signal, but a subject of electric power feeding is not limited thereto. A radio communication device generally includes a receiver and a display device other than the constitution parts shown in FIG. 1. Further, some of recent multifunctional mobile phones which can operate as radio equipment are provided with various functions such as a digital camera function, an Internet connection function, a game function, and an IC card function (credit card function) in addition to a conversation function and an e-mail function. Therefore, ICs which implement such functions as a data-processing device, a memory for holding processing data, and a memory for storing programs to execute functions are used in a mobile phone. Some of those ICs acting as functional constituent parts may have extremely small power consumption.
FIG. 6 shows a functional constitution example of the radio communication device of the second embodiment. A radio communication device 200 is different from the radio communication device 100 of FIG. 1 in that a phase shifter 250 is provided between the circulator 140 and the antenna 110. The circulator 140 transfers a signal inputted to the 1st port P1 to the 2nd port P2. However, a trace amount of the signal inputted to the 1st port P1 leaks to the 3rd port P3. The phase shifter 250 aligns the phase of the reflected wave from the antenna 110 with the phase of a transmission signal leaked to the 3rd port P3, in phase, or at least adjusts the two phases not to be in reverse relation to each other. Since this makes it possible to convert the reflected wave and the leaked transmission signal into an electric power, power utilization efficiency can be further increased.
FIG. 7 shows a functional constitution example of the radio communication device in which carriers of a plurality of frequency bands share a single antenna. A radio communication device 300 is provided with an amplifying part 120-n (n is 1 or 2 in the example of FIG. 7), a circulator 140-n and a signal source 150-n for each frequency band. Further, the antenna 110 is selectively connected to either one of the circulators (140-1, 140-2) by a switch 360. With such a constitution of sharing a single antenna by carriers of a plurality of frequency bands, the power utilization efficiency can be enhanced. Although FIG. 7 shows the case of using two carrier frequency bands, the number of the amplifying parts 120-n, the circulators 140-n and the signal sources 150-n should only be increased (n is 3 or more) in the case of using three or more carrier frequency bands in the same manner. In the constitution of FIG. 7, a switch 370 that operates in synchronism with the switch 360 is further provided to selectively supply to one of the amplifying parts 120-1, 120-2. As a result, wasteful consumption of electric power in the non-selected amplifying parts can be avoided by feeding the electric power only to the amplifying part 120-n corresponding to the frequency band selected by the switch 360.
FIG. 8 shows an embodiment in which the present invention is applied to a radio communication device that is simultaneously communicable in different frequency bands using a plurality of antennas, for example. A radio communication device 400 is provided with plural sets of the antenna 110-n, the amplifying part 120-n, the circulator 140-n, the rectifying part 130-n and the signal source 150-n (n is 1 or 2) employed in the radio communication device 100 (FIG. 1). Further, outputs from the rectifying parts 130-n are combined by a power combiner 380, and the combined power is used as an aid to power supply to each amplifying part 120-n. Since the radio communication device 400 has such a constitution, the power utilization efficiency can be increased similarly to the radio communication device 100.
FIG. 9 shows a functional constitution of the radio communication device in the case where a plurality of antennas are used for the same frequency band. The carrier frequency bands of the signal sources 150-n (n is 1 or 2) in FIG. 9 should be the same. A radio communication device 500 is provided with plural sets of the antenna 110-n, the circulator 140-n, the amplifying part 120-n and the signal source 150-n shown in FIG. 6. In addition, plural phase shifters 330-n and a power combiner 380 are also provided.
According to the present invention, even if a high-frequency transmission signal is reflected by the antenna, the reflected signal can be converted into a reusable electric power. Therefore, it is possible to provide a radio communication device with higher power utilization efficiency than a conventional device in which the reflected wave is consumed by converting it into heat or the like. Further, by aligning the phases of a plurality of high-frequency signals using phase shifters and combining them, the power utilization efficiency can be further increased.
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