35results about How to "Improve signal reception sensitivity" patented technology

Disclosed is a bandpass filter comprising a first resonator 1 to a sixth resonator 6 having lengths of basically ¼ wavelength, an input section IN connected to an ungrounded end of the first resonator, and an output section OUT connected to an ungrounded end of the sixth resonator, wherein the second to fifth resonators 2-5 are electromagnetically coupled with each other, the second and the third resonators are respectively coupled to the first resonator via the first and the second capacitances C1,C2, the third and the fourth resonators are respectively coupled to the sixth resonator via the third and the fourth capacitances C3,C4, and the input section IN and output section OUT are coupled to the first resonator and sixth resonator through an input and output capacitances C5, C6, respectively. This bandpass filter can be a small size, low loss filter suitable for UWB (Ultra Wide Band).

According to a WDM optical transmission system of the present invention, wavelength numbers information of a WDM signal light output from an upstream side optical amplifying unit to a transmission path fiber, and signal output level information thereof are transmitted to a downstream side optical amplifying unit utilizing a supervisory control light. In the downstream side optical amplifying unit, a loss (span loss) in the transmission path fiber is computed using the upstream side signal output level information and downstream side signal input level information, so that a gain to be set for a downstream side optical amplifier is calculated based on the computed loss, and also, the gain is corrected based on a difference between a target value of the signal output level computed using the wavelength numbers information and an actual measurement value thereof, so that the optical amplifier is controlled in accordance with the post-corrected gain. As a result, it becomes possible to reduce an influence by a measurement error of the span loss, to thereby control the optical amplifier at a high-speed and with high precision.

The invention discloses an ultrashort wave folding type discone antenna which comprises a telescopic component, a core rod, a top control disk, a sliding shaft, a flange casing, a main supporting pipe, a vertical-polarization conductor casing, a lower connecting disk, an upper connecting disk, eight horizontal-polarization long oscillators, eight horizontal-polarization short oscillators, eight oblique-polarization antenna vibrators and a signal processing circuit module. Under the mode that the operating frequency range of ultrashort waves is met, the range of operating frequency range of the antenna is expanded furthest to 20-3600MHz, and the signal receiving sensitivity is improved. The structure size of the antenna is reduced furthest, the weight is decreased, the size is reduced, and the force distribution of the whole cylindrical antenna structure is improved.

The invention discloses a transmission system and method for transmitting wide frequency band simulating radio frequency signals through optical transmission media. The transmission system comprises an antenna, indoor receiving equipment, a light emission box located at an antenna end, a light receiving box at a receiving equipment side and the optical transmission media connected with the light emission box and the light receiving box, wherein radio frequency signals output by the antenna are transmitted to the light emission box through a cable, the light emission box converts the radio frequency signals into light signals and then transmits the light signals to the light receiving box through the optical transmission media, the light receiving box recovers the light signals to the radio frequency signals and then transmits the radio frequency signals to the indoor receiving equipment through a cable, and the indoor receiving equipment analyzes and processes the radio frequency signals. The radio frequency signals are converted into the simulating light signals for signal transmission, the transmission system is large in transmission bandwidth, large in capacity, small in chromatic dispersion and free of electromagnetic interference, loss of the signals on the transmission line is largely reduced, the signal quality, safety and reliability of the system are improved, and the construction cost is reduced.

A wireless power transmitting device for a wireless power communication system. The wireless power transmitting device includes: a circuit board including an insulating layer and a ground formed on the insulating layer; a core of a magnetic substance disposed on the circuit board to have a concave portion; a wire-wound coil accommodated in the concave portion to have one end for receiving a power through the circuit board and the other end connected to the ground; and a metal layer disposed between the core and the insulating layer to be connected to the ground.

The invention discloses a three-in-one tuner with the compatibility of DVB-T / C and ATV, comprising an input selection module, a selection control circuit, a radio-frequency gain adjustment module, a down-conversion module and a decoding demodulation module, wherein, the input selection module is used for selecting two groups of input signals of a ground signal and a wired signal; the selection control circuit is used for controlling the input selection module to carry out input selection on a radio-frequency signal; the radio-frequency gain adjustment module is used for controlling the gain of the radio-frequency signal; the down-conversion module is used for converting the received radio-frequency signal into an intermediate-frequency signal suitable for the decoding demodulation module; and the decoding demodulation module is used for decoding and demodulating the intermediate-frequency signal after being amplified. In the invention, two signal lines are connected to the two input ends of a high-frequency head, which one of the ground signal and the wired signal is input to a lower-level circuit by the input selection module, the invention has simple circuit formation structure, realizes the compatibility of the DVB-T / C and the ATV and has good performance and high sensitivity; and compared with the prior art, the invention has more convenient debugging and use.

A wireless modem and noise cancellation method for the same for noise cancellation effectively cancels a noise signal induced from a device to which the wireless modem is connected. A primary antenna receives a radio signal that includes a first noise signal coming from a device to which the wireless modem is connected; a secondary antenna receives a second noise signal from the connected device; a noise signal adjuster for adjusting the second noise signal received by the secondary antenna using a correlation parameter between noise signals received by the primary antenna and the secondary antenna; and a noise remover subtracts the noise signal adjusted by the noise signal adjuster from the radio signal received by the primary antenna.

The invention discloses a wide-frequency-range, high-sensitivity, spurious-free and large-dynamic-range light emitting case and a light emitting method thereof. The wide-frequency-range, high-sensitivity, spurious-free and large-dynamic-range light emitting case comprises a radio frequency selecting switch, a radio frequency processing unit, a filter bank and an optical modulator. The input of the radio frequency selecting switch is connected with radio frequency input signals, and the output of the radio frequency selecting switch is connected with the input of the radio frequency preprocessing unit; the output of the radio frequency preprocessing unit is connected with the input of the filter bank; the output of the filter bank is connected with the input of the optical modulator; the radio frequency selecting switch selects one of multiple paths of radio frequency signals as the input, the radio frequency preprocessing unit preprocesses the input radio frequency signals, the filter bank filters out the interference signals of the preprocessed radio frequency signals, the optical modulator converts the radio frequency electric signals into optical signals, and the optical signals output by the optical modulator is connected with optical transmission medium. The wide-frequency-range, high-sensitivity, spurious-free and large-dynamic-range light emitting case is low in signal transmission loss, high in signal receiving sensitivity, large in transmission signal dynamic range, free from frequency deviation during the optical modulation process and capable of avoiding interference signals.

A television receiving apparatus 100 includes a television receiver 20, and a smart antenna 10 having directivity capable of being electrically changed so as to match radio waves to be received. A handle 50 is provided with a mechanism holding the smart antenna 10 therein, fixed to the television receiver 20 and capable of changing the distance between the smart antenna 10 and the television receiver 20 as an antenna holding box. The antenna having directivity capable of being electrically changed so as to match with radio waves to be received is disposed so that the aesthetic appearance can be improved and the signal receiving sensitivity of the antenna can be enhanced.

An optical coherence tomographic device configured to acquire a tomographic image of a subjected eye is disclosed herein. The optical coherence tomographic device may include a light source of wavelength sweeping type; and a measurement optical system configured to irradiate the subjected eye with light outputted from the light source, where D / S×λ>1.61 may be satisfied, with a diameter of the light outputted from the light source at an incident position to the subjected eye is D, a wavelength swept frequency of the light source is S, and a center wavelength of the light outputted from the light source is λ.

The invention discloses a three-in-one tuner with the compatibility of DVB-T / C and ATV, comprising an input selection module, a selection control circuit, a radio-frequency gain adjustment module, a down-conversion module and a decoding demodulation module, wherein, the input selection module is used for selecting two groups of input signals of a ground signal and a wired signal; the selection control circuit is used for controlling the input selection module to carry out input selection on a radio-frequency signal; the radio-frequency gain adjustment module is used for controlling the gain of the radio-frequency signal; the down-conversion module is used for converting the received radio-frequency signal into an intermediate-frequency signal suitable for the decoding demodulation module;and the decoding demodulation module is used for decoding and demodulating the intermediate-frequency signal after being amplified. In the invention, two signal lines are connected to the two input ends of a high-frequency head, which one of the ground signal and the wired signal is input to a lower-level circuit by the input selection module, the invention has simple circuit formation structure,realizes the compatibility of the DVB-T / C and the ATV and has good performance and high sensitivity; and compared with the prior art, the invention has more convenient debugging and use.

First and second signal processing units are each configured by an IC, so that the circuit space occupying in a receiver apparatus can be reduced. The signal path can be shortened from a BPF section inputting a program signal coming from a broadcasting station to a demodulation section compared with the related art. The transmission loss on the signal path can be thus reduced compared with the related art. The possible route for noise entering from the outside to the first and second signal processing units can be made as short as possible. This enables to reduce the noise entering from the outside, and prevents the signals coming over the signal path from being attenuated by the noise so that the signal reception sensitivity can be increased.

The invention discloses a wireless sensor testing system and method. The system uses a signal line control module to establish a dual-polarized antenna and The communication antenna signal link, and then establish wireless communication with the wireless sensor under test in the microwave anechoic chamber through the dual-polarization antenna and communication antenna, and at the same time use the control of the measurement and control host to realize the connection between different analysis test equipment and the wireless sensor under test The wireless communication is carried out through the dual-polarization antenna and the communication antenna, thereby realizing the integration of testing schemes of various types of wireless sensor equipment, and the whole system and method have strong compatibility and a high degree of automation. In the method of the present invention, the accuracy of the measured signal receiving sensitivity of the wireless sensor is higher by using six gradually smaller adjustment step values.

Disclosed is a bandpass filter comprising a first resonator 1 to a sixth resonator 6 having lengths of basically ¼ wavelength, an input section IN connected to an ungrounded end of the first resonator, and an output section OUT connected to an ungrounded end of the sixth resonator, wherein the second to fifth resonators 2-5 are electromagnetically coupled with each other, the second and the third resonators are respectively coupled to the first resonator via the first and the second capacitances C1,C2, the third and the fourth resonators are respectively coupled to the sixth resonator via the third and the fourth capacitances C3,C4, and the input section IN and output section OUT are coupled to the first resonator and sixth resonator through an input and output capacitances C5, C6, respectively. This bandpass filter can be a small size, low loss filter suitable for UWB (Ultra Wide Band).