Source: http://www.google.com/patents/US6466774?dq=mirroring+data+in+a+remote+data+storage+system
Timestamp: 2016-08-27 05:26:34
Document Index: 396060668

Matched Legal Cases: ['art\n55', 'art 50', 'art 50', 'art 55', 'art 15', 'art 15']

Patent US6466774 - Wireless handset - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA novel wireless handset is provided which can provide control so as to tune a center frequency of impedance matching of a tunable antenna to a call frequency. A first control signal sent from the central processing unit 51 to the synthesizer 41 or data used in the central processing unit to generate...http://www.google.com/patents/US6466774?utm_source=gb-gplus-sharePatent US6466774 - Wireless handsetAdvanced Patent SearchPublication numberUS6466774 B1Publication typeGrantApplication numberUS 09/663,206Publication dateOct 15, 2002Filing dateSep 18, 2000Priority dateJul 21, 1998Fee statusLapsedAlso published asUS6198441Publication number09663206, 663206, US 6466774 B1, US 6466774B1, US-B1-6466774, US6466774 B1, US6466774B1InventorsHiroshi Okabe, Ken TakeiOriginal AssigneeHitachi, Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (20), Referenced by (89), Classifications (13), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetWireless handset
US 6466774 B1Abstract
A novel wireless handset is provided which can provide control so as to tune a center frequency of impedance matching of a tunable antenna to a call frequency.
A first control signal sent from the central processing unit 51 to the synthesizer 41 or data used in the central processing unit to generate the first control signal is used to generate a second control signal by the central processing unit or the control signal generator 52 provided in the outside connected with the central processing unit, and the second control signal is applied to the control circuit 30 for center frequency of impedance matching, whereby center frequencies of impedance matching of the tunable antenna 10 are controlled.
What is claimed is: 1. A wireless handset used in a communication system that switches a plurality of call frequencies for use, comprising: a tunable antenna having a circuit for center frequency of impedance matching; a strength detector for retaining received signal strength for each call frequency; a circuit that refers to a frequency to voltage conversion table retaining a relationship between a digital signal for controlling a DC voltage value for setting a center frequency of impedance matching of said tunable antenna and each call frequency, to output a digital signal corresponding to information about a call frequency indicating an input maximum received signal strength; and a digital to analog converter for generating a DC voltage for setting a center frequency of impedance matching of the tunable antenna in accordance with said digital signal, wherein control is performed by said DC voltage so that a center frequency of impedance matching of the tunable antenna tunes to a call frequency.
This application is a continuation of Ser. No. 09/353,284 filed on Jul. 14, 1999 now U.S. Pat. No. 6,198,441.
Generally, the band of frequencies used for calls between a specific base station and terminal equipment is much smaller than an entire frequency band of a system. Accordingly, for each call, by adaptively changing a center frequency of impedance matching of an antenna to a frequency used for the call, a frequency band that the antenna should have can be decreased and the volume of the antenna can be reduced. As such an antenna, there is suggested by U.S. Pat. No. 6,034,644 a coaxial resonant slot antenna which supplies RF power to a strip conductor disposed within a conductive flat cubic with a slot provided on the top thereof and insulation from the conductive flat cubic, wherein the coaxial resonant slot antenna is a tunable slot antenna in which at least one island conductor is provided within the slot and center frequencies of impedance matching of the antenna can be changed in a wide range by changing capacitance values between the island conductor and the wall face of the conductive flat cubic.
The above described problem of the present invention can be effectively solved by providing a wireless handset with a built-in tunable antenna, comprising a built-in antenna provided within a case of the wireless handset, an RF circuit part connected to the built-in antenna, a logic circuits part connected to the RF circuit part, and a frequency synthesizer connected between the logic circuits part and said RF circuit, which generates a local oscillation frequency signal in said frequency synthesizer in accordance with a first control signal from a central processing unit contained in said logic circuits part and performs sending/receiving operations with a frequency determined by said local oscillation frequency signal in said RF circuit, wherein said built-in antenna is a tunable antenna including a control circuit for center frequency of impedance matching and a control signal generator is provided within said central processing unit or in the outside connected to the central processing unit and is connected to said control circuit for center frequency of impedance matching, and wherein the control signal generator generates a second control signal from said first control signal sent to said frequency synthesizer or data used in said central processing unit to generate the first control signal, and controls a center frequency of impedance matching of said tunable antenna by applying said second control signal to said control circuit for center frequency of impedance matching.
In a wireless handset, comprising a receive-only built-in antenna, an outer antenna for sending and receiving, an RF signal switching circuit connected between said built-in antenna and said outer antenna, an RF circuit part connected to said RF signal switching circuit, a logic circuits part connected to said RF circuit part, a frequency synthesizer connected between said logical circuit and said RF circuit, and a received signal strength detector provided within said RF circuit or in the outside connected thereto and connected to said logic circuits part, which generates a local oscillation frequency signal in said frequency synthesizer in accordance with a first control signal from a central processing unit contained in said logic circuits part, performs sending/receiving operations with a frequency determined by said local oscillation frequency signal in said RF circuit, and performs diversity receiving wherein an antenna with which higher received signal strength is detected in said received signal strength detector is used for receiving when an antenna connected with said RF circuit by said RF signal switching circuit is said built-in antenna or said outer antenna, wherein said built-in antenna is a tunable antenna including a control circuit for center frequency of impedance matching and a control signal generator is provided within said central processing unit or in the outside connected to the central processing unit and is connected to said control circuit for center frequency of impedance matching, if the control signal generator generates a second control signal from said first control signal sent to said frequency synthesizer or data used in said central processing unit to generate the first control signal and controls a center frequency of impedance matching of said tunable antenna by applying said second control signal to said control circuit for center frequency of impedance matching, since a center frequency of impedance matching of a tunable antenna can be tuned to a call frequency using the call frequency information using the first control signal containing the call frequency information or data used in the central processing unit to generate the first control signal, a compact tunable antenna with a narrow bandwidth could be used as a built-in antenna.
50: Logic circuits part
55: Arithmetic and logic circuits part
FIG. 1 shows a perspective view of circuits and a circuit board of a wireless handset with a built-in tunable antenna which includes a tunable antenna, an RF circuit, and a logic circuits part on an identical circuit board. In FIG. 1, the reference numerals 10, 30, 40, 41, 51, 52, and 60 designate a tunable antenna, a control circuit for center frequency of impedance matching of the tunable antenna, an RF circuit, a frequency synthesizer, a central processing unit provided in a logic circuits part 50, a control signal generator, and a circuit board, respectively.
The RF circuit 40 is connected with the tunable antenna 10, the logic circuits part 50, and the frequency synthesizer 41. Furthermore, the frequency synthesizer is connected with the central processing unit 51. A send signal is generated in the logic circuits part and is sent to the RF circuit, and is sent from the antenna after being subjected to frequency conversion using a local oscillation frequency signal generated by the frequency synthesizer within the RF circuit. Reversely, a receive signal, after being received in the antenna, is sent to the RF circuit and, after being subjected to frequency conversion using a local oscillation frequency signal generated by the frequency synthesizer within the RF circuit, is sent to the logic circuits part.
FIG. 4 shows a perspective view of circuits and a circuit board for explaining a fourth embodiment of the present invention. A control circuit 30 for center frequency of impedance matching changes a center frequency of impedance matching of a tunable antenna 10 in accordance with a DC voltage value of a control signal input to the circuit. A control signal generator comprises an arithmetic and logic circuits part 55, a frequency to voltage conversion table 53, and a digital to analog converter 54.
When a central processing unit 51 sends a first control signal to a frequency synthesizer 41 to determine a send/receive frequency of an RF circuit 40, the first control signal or data used in the central processing unit to generate the first control signal is sent to the arithmetic and logic circuits part. The frequency to voltage conversion table retains several relationships between a first control signal input to the arithmetic and logic circuits part or data used in the central processing unit to generate the first control signal, and digital signals to be output from the arithmetic and logic circuits part so as to generate from the digital to analog converter a second control signal having a DC voltage value which enables a center frequency of impedance matching of the tunable antenna 10 to tune to a call frequency determined by the first control signal. When a first control signal input to the arithmetic and logic circuits part or data used in the central processing unit to generate the first control signal is input to the arithmetic and logic circuits part, the arithmetic and logic circuits part refers to the relationships between input and output signals, retained in the frequency to voltage table, compensates data related to input and output signals by approximate computations, and generates digital signals. The digital to analog converter generates a DC voltage in accordance with a digital signal output by the arithmetic and logic circuits part. Since the DC voltage is applied to the control circuit for center frequency of impedance matching as a second control signal having a DC voltage value that enables a center frequency of impedance matching of the tunable antenna to tune to a call frequency determined by the first control signal, control is performed by the control circuit for center frequency of impedance matching so that a center frequency of impedance matching of the tunable antenna tunes to a call frequency determined by the first control signal.
In order that the arithmetic and logic circuits part generates output signals for inputs corresponding to input/output signal relationships not retained in the frequency to voltage conversion table, for example, when a center frequency of impedance matching of a tunable antenna is proportional to a DC voltage value of a second control signal input to the control circuit for center frequency of impedance matching, two first control signals or two pieces of data used in the central processing unit to generate the first control signals having frequency information corresponding to two different call channels of call frequencies, and two digital signals to be input to the digital to analog converter to generate DC voltage values of a second control signal that tune center frequencies of impedance matching of the tunable antenna to frequencies corresponding to the two call channels are retained in the frequency to voltage conversion table, whereby a frequency change to unit voltage, determined by a potential difference of DC voltages generated in the digital to analog converter from the former two frequency intervals and the latter two, and a frequency and a DC voltage value corresponding to one of the call channels can be used to linearly and approximately compute a DC voltage value required for a certain frequency, so that a required DC voltage value could be found by performing the above linear, approximate computation for a frequency determined by a signal input to the arithmetic and logic circuits part and a digital signal for generating the DC voltage value in the digital to analog converter could be output. When a center frequency of impedance matching of a tunable antenna is not proportional to a DC voltage value of a second control signal input to the control circuit for center frequency of impedance matching, by retaining the relationship among input and output signals in the frequency to voltage conversion table for each section in which the relationship between center frequencies of impedance matching and DC voltages of second control signals appears almost proportional, a linear, approximate computation can be performed for each section. When a center frequency of impedance matching of a tunable antenna is not proportional to a DC voltage value of a second control signal input to the control circuit for center frequency of impedance matching, polynomial equation approximation might be used as an approximate computation method, in which case the number of pieces of data the input/output signal relationships to be retained in the frequency to voltage conversion table can be reduced, compared to the linear approximation by section.
According to this embodiment, as described previously, since data related to input and output signals can be compensated by approximate computations by the arithmetic and logic circuits part from several pieces of data of input/output signal relationships retained in the frequency to voltage conversion table, in order that the arithmetic and logic circuits part, in response to an input signal, outputs a signal that causes the tunable antenna to be tuned to a call frequency, the frequency to voltage conversion table need not retain input/output signal relationships corresponding to all call channels, so that a more inexpensive circuit with a smaller storage capacity can be used as the frequency to voltage conversion table, compared to the wireless handset according to the fourth embodiment, and the process of retaining required input/output signal relationships in the frequency to voltage conversion table can be simplified, and thereby the cost of fabricating a wireless handset can be reduced.
If the resistor has a sufficiently higher resistance value than RF impedance that the strip conductor has for the conductive flat cubic, the resistor 33 can be handled as a first element for blocking RF power which prevents an RF signal fed from the coupling part 15 from leaking from the strip conductor to the island conductor via the resistor 33. If the value of the resistor 33 is set sufficiently lower than DC resistance of the variable capacitance diode, a DC voltage applied to the coupling port can be effectively applied to the variable capacitance diode via the strip conductor, resistor 33, and island conductor. Since RF impedance that the strip conductor has for the conductive flat cubic is several ohms to hundreds of ohms and DC resistance of the variable capacitance diode is generally in the order of 10 MΩ, If the resistor 33 has a resistance value of tens to hundreds of kiloohms, the above conditions both are satisfied. By doing so, the coupling part 15 can be handled as a feeding point for RF signals to the antenna and as a feeding point for DC voltage applied to the variable capacitance diode.
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