Aspects of the subject disclosure may include, for example, receiving, by a feed point of a dielectric antenna, electromagnetic waves from a dielectric core coupled to the feed point without an electrical return path, where at least a portion of the dielectric antenna comprises a conductive surface, directing, by the feed point, the electromagnetic waves to a proximal portion of the dielectric antenna, and radiating, via an aperture of the dielectric antenna, a wireless signal responsive to the electromagnetic waves being received at the aperture. Other embodiments are disclosed.

Method and apparatus for coupling an antenna to a device

A distributed antenna system is provided that frequency shifts the output of one or more microcells to a 60 GHz or higher frequency range for transmission to a set of distributed antennas. The cellular band outputs of these microcell base station devices are used to modulate a 60 GHz (or higher) carrier wave, yielding a group of subcarriers on the 60 GHz carrier wave. This group will then be transmitted in the air via analog microwave RF unit, after which it can be repeated or radiated to the surrounding area. The repeaters amplify the signal and resend it on the air again toward the next repeater. In places where a microcell is required, the 60 GHz signal is shifted in frequency back to its original frequency (e.g., the 1.9 GHz cellular band) and radiated locally to nearby mobile devices.

Remote distributed antenna system

Aspects of the subject disclosure may include, for example, a device that facilitates transmitting electromagnetic waves along a surface of a wire that facilitates delivery of electric energy to devices, and sensing a condition that is adverse to the electromagnetic waves propagating along the surface of the wire. Other embodiments are disclosed.

Method and apparatus for sensing a condition in a transmission medium of electromagnetic waves

Aspects of the subject disclosure may include, for example, a system for detecting a fault in a first wire of a power grid that affects a transmission or reception of electromagnetic waves that transport data and that propagate along a surface of the first wire, selecting a backup communication medium from one or more backup communication mediums according to one or more selection criteria, and redirecting the data to the backup communication medium to circumvent the fault. Other embodiments are disclosed.

Method and apparatus that provides fault tolerance in a communication network

Aspects of the subject disclosure may include, for example, a transmission device that includes a transmitter that generates a first electromagnetic wave to convey data. A coupler couples the first electromagnetic wave to a single wire transmission medium having an outer surface, to forming a second electromagnetic wave that is guided to propagate along the outer surface of the single wire transmission medium via at least one guided wave mode that includes an asymmetric or non-fundamental mode having a lower cutoff frequency. A carrier frequency of the second electromagnetic wave is selected to be within a limited range of the lower cutoff frequency, so that a majority of the electric field is concentrated within a distance from the outer surface that is less than half the largest cross sectional dimension of the single wire transmission medium, and/or to reduce propagation loss. Other embodiments are disclosed.

Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith

Provided is a touch panel system (1) capable of reliably removing a wide variety of noises. The touch panel system (1) includes a main sensor (31) which detects a touch operation, a sub sensor (32) which does not detect a touch operation but detects a noise component, and a subtracting section (41) which subtracts, from an output signal of the main sensor (31), an output signal of the sub sensor (32). The subtracting section (41) performs a subtracting operation to remove a noise component from the output signal of the main sensor (31), thereby extracting a signal derived from the touch operation itself.

Touch panel system and electronic device

PROBLEM TO BE SOLVED: To prevent, in a highly sensitive touch panel system that allows a touch operation by an approach of a human finger or the like without contact, an operational error caused by an unintentional approach of a human finger or the like.SOLUTION: A touch panel system 1 comprises: a touch panel 10; and a touch panel controller 20 that receives a signal from the touch panel 10 and detects a touch operation by a user referring to the received signal. The touch panel controller 20 includes touch operation sensitivity change means 23 that changes sensitivity to the touch operation detected at the touch panel.

Touch panel system and electronic apparatus using the same

A novel power reduction technique is proposed for a switched-capacitor amplifier (SCA) with two-stage operational amplifier. This technique improves both the bandwidth and the slew rate of the SCA with only two additional switches, and therefore, the power consumption of the SCA is reduced. This power reduction technique is applied to a variable gain amplifier (VGA) which is implemented in an analog front-end of camera modules for cellular phones. This reduces 30% of the VGA power consumption compared to the conventional one. Fabricated in 0.25-/spl mu/m CMOS process with 3.3-V transistors and MIM capacitors, the VGA occupies 0.49/spl times/0.49 mm/sup 2/ and dissipates 18.7 mW at 18 MHz with a supply voltage of 3.1 V.

A low-power switched-capacitor variable gain amplifier

A seventh-order single-loop single-bit delta-sigma modulator for a 1-bit digital audio switching amplifier is presented. To achieve high SNR and ensure the modulator stability for a large input range, the positions of the modulator loop filter poles and zeros are optimized, and a feedback comparator is used. A test chip was fabricated in a 0.35-μm CMOS process with optional 5-V transistors. The modulator achieves an SNR of 111 dB and 0.0015-% THD+N over the audio band. The normalized maximum allowable input range is 0.89. There are two modulators on one chip, one for each left and right audio channel. The isolation between both channels is over 135 dB. The chip area is 12.6 mm 2 and it draws 60 mA from a 5-V supply.

A delta-sigma modulator for a 1-bit digital switching amplifier

A capacitance distribution detection circuit (102) includes a multiplexer (104), a driver (105), and a sense amplifier (106), and the multiplexer (104) switches states between a first connection state in which first signal lines (HL1 to HLM) are connected to the driver (105) and second signal lines (VL1 to VLM) are connected to the sense amplifier (106), and a second connection state in which the first signal lines (HL1 to HLM) are connected to the sense amplifier (106) and the second signal lines (VL1 to VLM) are connected to the driver (105). The first connection state (A) (a) drives, on the basis of code sequences (di (= di1, di2,..., diN, where i = 1,..., M)) which include +1 or -1 and each of which has a length N, the first signal lines (HL1 to HLM) in parallel so that voltages +V or -V are applied and (b) outputs, along each of the second signal lines (VL1 to VLM), a linear sum of electric charges stored in capacitors corresponding to that respective one of the second signal lines, and (B) estimates, on the basis of an inner product operation of the linear sum of the electric charges outputted along the second signal lines (VL1 to VLM) and the code sequences di, a capacitance of the capacitors formed along that second signal line, for each of the plurality of second signal lines (VL1 to VLM), and the second connection state (C) (a) drives, on the basis of code sequences (di (= di1, di2,..., diN, where i = 1,..., M)), the second signal lines (VL1 to VLM) in parallel so that voltages +V or -V are applied and (b) outputs, along each of the first signal lines (HL1 to HLM), a linear sum of electric charges stored in the capacitors corresponding to that respective one of the first signal lines, and (D) estimates, on the basis of an inner product operation of the linear sum of the electric charges outputted along the first signal lines (HL1 to HLM) and the code sequences di, a capacitance of the capacitors formed along that first signal line, for each of the plurality of first signal lines (HL1 to HLM).

Masayuki Miyamoto

Papers

Touch panel system and electronic device

Touch panel system and electronic apparatus using the same

A low-power switched-capacitor variable gain amplifier

A delta-sigma modulator for a 1-bit digital switching amplifier

Linear device value estimating method, capacitance detection method, integrated circuit, touch sensor system, and electronic device