Abstract: The present invention describes a RF signal control method and device that adjusts the first down-converter gain attenuation and uses the adjusted first down-converter gain attenuation to change the RF signal. The RF signal control method and device also uses a determined linear filter parameter to perform linearity improvement on the digital signal after the RF signal goes through a down-converter and analog-to-digital converter. The RF signal control method and device use an increased up-converter gain attenuation value to correct the RF input signal after digital pre-distortion operation, so that the adjusted and/or improved signals after power amplification have better quality than the RF signal with just a simple analog-to-digital converter and clipping equipment. Thus, the current application improves the linearity effect of digital pre-distortion operation and the dynamic effect of the power amplifier operation, thereby promoting the coverage effect of the RF output signal.

Abstract: An electrically adjustable antenna control system includes a controller, an actuation mechanism controlled by the controller, and a feedback loop connected to both of the controller and actuation mechanism. Herein, the controller includes a control board and its imbedded program. The actuation mechanism includes a DC geared motor controlled by the control board and embedded program and an electrically adjustable antenna phase shifter driven by the geared motor. The feedback loop has a travel plate electrically coupled to both of the control board and DC geared motor and a counter device installed on the geared motor. The present invention also provides an electrically adjustable antenna control method realized by the above-mentioned electrically adjustable antenna control system.

Abstract: A broadband radiation unit includes first and second pairs of symmetric dipoles operable to transmit communication signals and to receive communication signals. The first pair of symmetric dipoles has a polarization that is orthogonal to that of the second pair of symmetric dipoles. The first and second pairs of symmetric dipoles together define an annular structure. A plurality of baluns are associated with the first and second pairs of symmetric dipoles such that a given one of the baluns is associated with a respective symmetric dipole of the pairs of symmetric dipoles. Each one of the baluns feeds a balanced current to its associated symmetric dipole. Each symmetric dipole of the first and second pairs of symmetric dipoles has two unit arms which are disposed on and arranged symmetrically about its associated balun.

Abstract: The invention discloses a DCS/WCDMA dual frequency multiplexer. On one hand, the multiplexer utilizes distributed parameter type capacitors in place of conventionally used capacitors. On the other hand, within the multiplexer, a direct circuit and a RF circuit are isolated from each other physically. All components including capacitors co-exist together physically. Similarly, the invention further discloses a dual frequency multiplexer with large application range. It also utilizes the distributed parameter type capacitors like the DCS/WCDMA dual frequency multiplexer. Because the invention has redesigned the entire construction of the multiplexer, it results good effects such as small size, less differential loss, large power capacity, as well as high isolation degree between circuits.

Abstract: A mobile communication coverage distribution system in corridor is used for mobile communication signal coverage in corridor environment. The system includes a radio frequency (RF) cable arranged along longitudinal direction of the corridor and intended for signal transmission and having a plurality of spaced access nodes; a signal source for transmitting signal to from the RF cable or receiving signal to from the RF cable; a number of coupled radiation units corresponding to each access node and used to realize signal coverage in a limited range near the access node, said signal being transmitted across the RF cable. The mobile communication coverage distribution system in corridor according to the invention has simple structure, low cost, is convenient in construction and has reliable performance.

Abstract: The invention discloses a dual frequency multiplexer by which a first and second coaxial harmonic oscillator type band pass filters are disposed in a box. The box includes a base body, a cover plate and a cover body. The two coaxial harmonic oscillator type hand pass filters are located on the base body and spaced each other by a metal plate; the multiplexer port, first and second ports are positioned on lateral side of the base body. The blocking capacitors are contained in the coaxial chamber of the two coaxial harmonic oscillator type band pass filters. The cover plate is secured on the base body; the first and second direct current circuits are placed on the cover plate; the low pass filters of the first and second direct current circuits are fixed on an edge of a top surface of the coaxial chamber by means of a support member; the cover body and the base body are fastened with each other. The blocking capacitors each are of distributed parameter capacitor.

Abstract: An ultra wideband dual-frequency combiner includes a combination port (Port 1), a first port (Port 2), a second port (Port 3), two coaxial resonator band pass filters and two direct current channels. The first direct current channel is connected between the first port (Port 2) and the combination port (Port 1). The second direct current channel is connected between the second port (Port 3) and the combination port (Port 1). One end of the first coaxial resonator hand pass filters (610, 611) is electrically connected with the first port (Port 2) via a first blocking capacitor. One end of the second coaxial resonator hand pass filter (620, 621) is electrically connected with the second port (Port 3) via a second blocking capacitor. The other ends of the first coaxial resonator band pass filter and the second coaxial resonator band pass filter are connected with the combination port (Port 1) via a third blocking capacitor. The blocking capacitors are parameter distributed capacitors.

Abstract: A planar oscillator is provided includes an oscillator portion formed by four oscillator arms, the four oscillator arms defining two orthogonal half-wave oscillators, each oscillator arm being of a square and these oscillator arms being arranged in a square configuration, each oscillator arm having a feeding terminal defined at a corner thereof facing another oscillator arm; a connective portion connected among these oscillator arms so that these arms are connected with each other; and a medium base plate for printing the oscillator portion and connective portion thereon. In addition, a plurality of through holes is defined in the medium base plate. The antenna made according to the invention is simple and compact in construction and good in performance. In addition, the antenna is easy to be manufactured and assembled. Moreover, the antenna of the invention benefits from wide bandwidth, high gain and cross polarization ratio, and excellent isolation.

Abstract: A broadband radiation unit includes first and second pairs of symmetric dipoles operable to transmit communication signals and to receive communication signals. The first pair of symmetric dipoles has a polarization that is orthogonal to that of the second pair of symmetric dipoles. The first and second pairs of symmetric dipoles together define an annular structure. A plurality of baluns are associated with the first and second pairs of symmetric dipoles such that a given one of the baluns is associated with a respective symmetric dipole of the pairs of symmetric dipoles. Each one of the baluns feeds a balanced current to its associated symmetric dipole. Each symmetric dipole of the first and second pairs of symmetric dipoles has two unit arms which are disposed on and arranged symmetrically about its associated balun.

Abstract: The invention discloses a dual frequency multiplexer by which a first and second coaxial harmonic oscillator type band pass filters are disposed in a box. The box includes a base body, a cover plate and a cover body. The two coaxial harmonic oscillator type hand pass filters are located on the base body and spaced each other by a metal plate; the multiplexer port, first and second ports are positioned on lateral side of the base body. The blocking capacitors are contained in the coaxial chamber of the two coaxial harmonic oscillator type band pass filters. The cover plate is secured on the base body; the first and second direct current circuits are placed on the cover plate; the low pass filters of the first and second direct current circuits are fixed on an edge of a top surface of the coaxial chamber by means of a support member; the cover body and the base body are fastened with each other. The blocking capacitors each are of distributed parameter capacitor.

Abstract: The invention discloses a DCS/WCDMA dual frequency multiplexer. On one hand, the multiplexer utilizes distributed parameter type capacitors in place of conventionally used capacitors. On the other hand, within the multiplexer, a direct circuit and a RF circuit are isolated from each other physically. All components including capacitors co-exist together physically. Similarly, the invention further discloses a dual frequency multiplexer with large application range. It also utilizes the distributed parameter type capacitors like the DCS/WCDMA dual frequency multiplexer. Because the invention has redesigned the entire construction of the multiplexer, it results good effects such as small size, less differential loss, large power capacity, as well as high isolation degree between circuits.

Abstract: An ultra wideband dual-frequency combiner includes a combination port (Port 1), a first port (Port 2) a second port (Port 3), two coaxial resonator band pass filters and two direct current channels. The first direct current channel is connected between the first port (Port 2) and the combination port (Port 1). The second direct current channel is connected between the second port (Port 3) and the combination port (Port 1). One end of the first coaxial resonator hand pass filters (610, 611) is electrically connected with the first port (Port 2) via a first blocking capacitor. One end of the second coaxial resonator hand pass filter (620, 621) is electrically connected with the second port (Port 3) via a second blocking capacitor. The other ends of the first coaxial resonator band pass filter and the second coaxial resonator band pass filter are connected with the combination port (Port 1) via a third blocking capacitor. The blocking capacitors are parameter distributed capacitors.