Abstract: In a tunable duplexer combining a tunable filter with a canceler, calibration for optimizing passband characteristics and stop band characteristics is accelerated, and the deterioration of performance due to variations is highly accurately compensated. The tunable filter is calibrated to acquire isolation characteristics, and then coarse calibration and fine calibration are performed on the canceler. In coarse calibration, the use band of the tunable filter is set to a suppression band, and the isolation characteristics of the canceler are acquired. An amplitude, a phase, and a bias voltage are adjusted based on a result of comparison with the acquired isolation characteristics of the tunable filter for determining an approximate convergence. Fine calibration is further performed, and the optimum point is determined in a narrow range near the convergence.

Abstract: A tunable filter has an out-of-band signal suppression amount of 30 dB that is smaller than 50 dB, the suppression amount of a typical duplexer. Thus, a canceller having a suppression amount of about 20 dB is necessary (particularly, a method is provided to obtain a suppression amount over a wide band without being adversely affected by the group delay characteristics and frequency characteristics of an amplifier included in a canceller). Delay devices corresponding to the group delay of the amplifier are disposed on the signal path of the tunable filter. The canceller includes a matching circuit that adjusts an amplitude, a phase, and a delay, a wide-band amplifier that has small amplitude fluctuations and small phase fluctuations over the frequency bands of a transmission signal and a reception signal, a variable-impedance transmission coupler, and a variable-impedance reception coupler.

Abstract: A tunable filter and a tunable duplexer are provided, both of which comprise an input terminal, an output terminal, four fixed capacitors, three variable capacitors and three fixed coils; wherein the variable capacitors are grounded at one end and, at the other end, connected to the fixed coils to form three sets of series-connected LC circuit; wherein the connecting points of the three sets of series-connected LC circuit, the input terminal and the output terminal are connected with the fixed capacitors, respectively.

Abstract: A tunable filter in a tunable DPX module has frequency characteristics, and thus needs to be controlled with high accuracy so as to simultaneously cancel a transmission signal and noise in a reception band on a transmission side. For this reason, a canceller includes a filter having the same frequency characteristic as that of a tunable filter, and a structure having functions of compensating for an amplitude, a phase, and a delay. And, two lines of the cancellers are used to individually cancel a leak component of a transmission signal and a leak component of thermal noise in a reception band. In order to save the power consumption of the amplifier, a coupler is loosely coupled, and a combiner is tightly coupled. Further, in order to suppress the influence on a reception system due to the tough coupling, the combiner uses the amplifier for in-phase inputs.

Abstract: For providing a module for use of a mobile communication terminal, being small in sizes and high in reliability, and enabling with plural numbers of bands, and also a mobile communication terminal with using the same therein, canceling is conducted on transmission signal and/or noises of reception band on reception side with using a feed forward technology, for maintaining a degree of suppression of the transmission signal and/or the noises of reception band on the reception side. In this case, for achieving the cancellation of wide band signals from the transmission signal to the reception band, a delay adjusting function is used, in addition to gain and phase adjusting functions. Also, for conducting stable canceling of jamming signals, controls are conducted on the gain, the phase and the delay of a loop with using a reception SN and/or a CQI signal, etc. Further, for achieving low power consumption, a feed forward loop can be made ON/OFF depending on a level of the transmission signal.

Abstract: A piezoelectric thin-film acoustic wave device formed of a piezoelectric thin film of AlN on the +C plane and having the polarization strength of not lower than 0.63×10?20 F/V and an information processing unit using the same are disclosed. This is the result of the inventors having studied the factors other than the C-axis orientation affecting the electromechanical coupling factor and developing a method of improving the electromechanical coupling factor in view of the occasional fact that the electromechanical coupling factor cannot be improved by improving the C-axis orientation and the electromechanical coupling factor required for the piezoelectric thin-film acoustic wave device is not obtained. In such a case, the receiving sensitivity of the receiving system may be deteriorated and the transmission strength of the transmission system is required to be increased undesirably having an adverse effect on the power saving efforts.

Abstract: A high-frequency circuit has a duplexer and a filter. The duplexer performs wave separation of send and received signals as input thereto. The filter filters the input send signal. When the send and received signals of the first modulation method are input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer. When the received signal of the first modulation method is input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer, and the send signal of the second modulation method is filtered by the filter.

Abstract: A piezoelectric thin-film acoustic wave device formed of a piezoelectric thin film of AlN on the +C plane and having the polarization strength of not lower than 0.63×10?20 F/V and an information processing unit using the same are disclosed. This is the result of the inventors having studied the factors other than the C-axis orientation affecting the electromechanical coupling factor and developing a method of improving the electromechanical coupling factor in view of the occasional fact that the electromechanical coupling factor cannot be improved by improving the C-axis orientation and the electromechanical coupling factor required for the piezoelectric thin-film acoustic wave device is not obtained. In such a case, the receiving sensitivity of the receiving system may be deteriorated and the transmission strength of the transmission system is required to be increased undesirably having an adverse effect on the power saving efforts.

Abstract: A piezoelectric thin-film acoustic wave device formed of a piezoelectric thin film of AlN on the +C plane and having the polarization strength of not lower than 0.63×10?20 FN and an information processing unit using the same are disclosed. This is the result of the inventors having studied the factors other than the C-axis orientation affecting the electromechanical coupling factor and developing a method of improving the electromechanical coupling factor in view of the occasional fact that the electromechanical coupling factor cannot be improved by improving the C-axis orientation and the electromechanical coupling factor required for the piezoelectric thin-film acoustic wave device is not obtained. In such a case, the receiving sensitivity of the receiving system may be deteriorated and the transmission strength of the transmission system is required to be increased undesirably having an adverse effect on the power saving efforts.

Abstract: A dust cover for a steering shaft includes a bush of low-frictional material, through which a steering shaft penetrates; a plurality of bellows made of rubber, provided in an axial direction of the steering shaft, and arranged between the bush and a panel for sealing the clearance; and an annular seal lip in contact with the outer periphery of the steering shaft.

Abstract: A telescopic shaft for vehicle steering assembled into a steering shaft for a vehicle and having a female shaft and a male shaft that are so fitted to each other as to be unable to relatively rotate but to be slidable, the female shaft having its end portion attached with a seal member for preventing rain water etc from entering inside a fitting portion between the female shaft and the male shaft by sealing this fitting portion. The seal member is constructed of a high-rigidity support member and an elastic member, and an intermediate portion of the support member is bent, one end of the support member is a fixed portion fixed to the end portion of the female shaft, and at least an end portion on the other side of the support member is a fitted portion to which the elastic member is fitted so as to be in contact with an outer peripheral surface of the male shaft with frictional force.

Abstract: A high-frequency circuit has a duplexer and a filter. The duplexer performs wave separation of send and received signals as input thereto. The filter filters the input send signal. When the send and received signals of the first modulation method are input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer. When the received signal of the first modulation method is input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer, and the send signal of the second modulation method is filtered by the filter.

Abstract: A high-frequency appliance, which is allowed to have an ESD tolerance by using a small-sized and low-cost ESD protection circuit, and in particular, an antenna duplexer having a multi-band high-frequency switch function. There are provided a signal separation unit for separating a first frequency band signal from a second frequency band signal, the second frequency band being lower than the first frequency band, a first SAW filter for inputting the first frequency band signal outputted from the signal separation unit, a second SAW filter for inputting the second frequency band signal outputted from the signal separation unit, and a high-pass filter for permitting passing of the second frequency band signal, and limiting passing of a signal whose frequency band is lower than the second frequency band, the high-pass filter being located on a signal line connecting the signal separation unit and the second SAW filter to each other.

Abstract: [Problem] A dust cover for a steering prevents offensive sounds from emitting during an operation of a steering wheel. [Means for Solving] A dust cover for a steering shaft according to the present invention includes: a bush 2 of low-frictional material, through which a steering shaft 20 penetrates; a plurality of bellows 3 made of rubber, provided in an axial direction of the steering shaft 20, and arranged between the bush 2 and a panel 19, for sealing the clearance; and an annular seal lip 4 in contact with the outer periphery of the steering shaft 20.

Abstract: A high-frequency circuit has a duplexer and a filter. The duplexer performs wave separation of send and received signals as input thereto. The filter filters the input send signal. When the send and received signals of the first modulation method are input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer. When the received signal of the first modulation method is input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer, and the send signal of the second modulation method is filtered by the filter.

Abstract: A multi-band transceiver has a function of sharing transmitted and received signals of multiple frequency bands by the same antenna. The multi-band transceiver mounts multiple filters that correspond to the multiple frequency bands and multiple amplifiers for amplifying the transmitted signals on the same substrate, and arranges the multiple filters in close vicinity to the amplifier in the order where the multiple filters are excellent in their temperature characteristic.

Abstract: A high-frequency circuit has a duplexer and a filter. The duplexer performs wave separation of send and received signals as input thereto. The filter filters the input send signal. When the send and received signals of the first modulation method are input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer. When the received signal of the first modulation method is input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer, and the send signal of the second modulation method is filtered by the filter.

Abstract: A high-frequency circuit has a duplexer and a filter. The duplexer performs wave separation of send and received signals as input thereto. The filter filters the input send signal. When the send and received signals of the first modulation method are input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer. When the received signal of the first modulation method is input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer, and the send signal of the second modulation method is filtered by the filter.

Abstract: A structure of a spectrum spreading communication device which solves the problem with the conventional spectrum spreading communication using Barker codes, etc., and limits the rise of the side-lobe of a correctional signal independently of the order of information codes by use of a code sequence having a code length of at least 14. The spectrum spreading communication device uses a pseudo-noise code having code length of at least 14 and a self-correlation side-lobe of not greater than 3 as a pseudo-noise code of a direct spreading communication device which uses the pseudo-noise codes whose polarities are inverted so as to deal with also digital information. Thus, even when the pseudo-noise code length is 14 or more, the side-lobe of the correction coefficient can be restricted. Accordingly, the error rate of the spectrum spreading communication device is reduced and the processing gain is improved.

Abstract: A high-frequency circuit has a duplexer and a filter. The duplexer performs wave separation of send and received signals as input thereto. The filter filters the input send signal. When the send and received signals of the first modulation method are input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer. When the received signal of the first modulation method is input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer, and the send signal of the second modulation method is filtered by the filter.