摘要:
The present invention provides systems and methods for phase shifting signals wherein the phase shifting circuitry may be disposed in a relatively small footprint. The preferred embodiment utilizes PIN diodes to provide switched line phase shifting, wherein the switched lines are microstrip and/or stripline transmission lines of predetermined lengths. To minimize the space required, the switched lines of the preferred embodiment are disposed on different layers of a multi-layered support structure, such as a multi-layer circuit board. Layer changing vias are preferably adapted to provide a constant impedance to thereby make changes in layers in the transmission path electrically transparent to a transmitted signal.
摘要:
A receiving system 100 is disclosed which includes at least one antenna 101 providing a plurality of antenna beams providing signal diversity between communicated signals. A first processing branch 103 is included for processing a first plurality of signals appearing within a first plurality of the antenna beams. The first processing branch 103 includes a plurality of signal paths, some of which include delays 105, each receiving a one of the first plurality of signals from a corresponding one of the first plurality of antenna beams. Delays 105 apply a predetermined amount of delay proportionate to the corresponding one of the beams. First processing branch 103 further includes a combiner 106 for combining the first plurality of signals after output from the plurality of signal paths. A second processing branch 104 is provided for processing a second plurality of signals appearing within a second plurality of the antenna beams. Second processing branch 104 includes a plurality of signal paths, some of which include delays 105, each receiving one of the second plurality of signals from a corresponding one of the second plurality of antenna beams. Delays 105 applying a pre-selected amount of delay to the corresponding one of the beams. Second processing branch 104 further includes a combiner 106 for combining the second plurality of signals after output from the plurality of signal paths. Finally, a radio 102 is provided having a first port coupled to an output of first processing branch 103 and a second port coupled to a second processing branch 104.
摘要:
A method is disclosed for determining a technician to dispatch to a customer site requiring a service call. A first plurality of technicians assigned to a customer site requiring a service call is determined. A location of each of the technicians is also determined. A first plurality of distances is determined between each of the technicians and a plurality of locations at which is disposed equipment needed for the service call. A second plurality of distances is determined between each of the technicians and a plurality of service vehicles at which is disposed the equipment needed for the service call. One of the technicians is dispatched to the customer site based on the location of each of the technicians, on the first plurality of distances, and on the second plurality of distances. A system for implementing the method is disclosed.
摘要:
A method is disclosed for determining a technician to dispatch to a customer site requiring a service call. A first plurality of technicians assigned to a customer site requiring a service call is determined. A location of each of the technicians is also determined. A first plurality of distances is determined between each of the technicians and a plurality of locations at which is disposed equipment needed for the service call. A second plurality of distances is determined between each of the technicians and a plurality of service vehicles at which is disposed the equipment needed for the service call. One of the technicians is dispatched to the customer site based on the location of each of the technicians, on the first plurality of distances, and on the second plurality of distances. A system for implementing the method is also disclosed.
摘要:
Disclosed are systems and methods for providing amplitude or power adjustment of a plurality of corresponding signals by shifting power among various outputs associated with the corresponding signals. Accordingly, power steering circuitry of the present invention is provided in a signal path to accept input signals and distribute the power of the input signal among output signals. A preferred embodiment of the power steering circuitry of the present invention provides a multiple stage configuration wherein a first stage operates to shift power and select a power bias among subsets of the outputs while a subsequent stage or stages provide further granularity with respect to shifting of power among the outputs. According to a preferred embodiment, power shifters include an arrangement of back-to-back hybrid combiners having phase adjusting circuitry disposed there between. Accordingly, a preferred embodiment of the power steering circuitry of the present invention provides a matrix of back-to-back hybrid combiners to provide desired steering of signal power.
摘要:
The invention provides a power sharing amplifier system for a cellular communications system, having with an 8th order transform matrix circuit, eight power sharing amplifiers and an 8th order inverse transform matrix circuit. The 8th order transform matrix circuit has six input ports and responds to six RF input signals for providing 8th order transform matrix RF input signals. The 8th order transform matrix circuit also has two input ports that do not receive input signals, but instead are coupled through a resistor to ground. The eight power sharing amplifiers respond to the 8th order transform matrix RF input signals, for providing eight amplified transformed RF signals. The 8th order inverse transform matrix circuit responds to the eight amplified transformed RF signals, for providing six inverse transform amplified RF output signals to six output ports. The 8th order inverse transform matrix circuit also has two output ports that do not provide output signals to an antenna, but instead are coupled through a resistor to ground for dissipating intermodulation distortion products.
摘要:
A method is disclosed for determining a technician to dispatch to a customer site requiring a service call. A first plurality of technicians assigned to a customer site requiring a service call is determined. A location of each of the technicians is also determined. A first plurality of distances is determined between each of the technicians and a plurality of locations at which is disposed equipment needed for the service call. A second plurality of distances is determined between each of the technicians and a plurality of service vehicles at which is disposed the equipment needed for the service call. One of the technicians is dispatched to the customer site based on the location of each of the technicians, on the first plurality of distances, and on the second plurality of distances. A system for implementing the method is disclosed.
摘要:
A method and apparatus for calibrating an antenna apparatus and testing an antenna connected thereto is provided. The calibration is conducted without an antenna connected to establish a baseline return loss calibration coefficient. Thereafter, after an antenna is connected, a test may be conducted to measure the performance of the antenna on the antenna site apparatus. The calibration process includes measuring a leakage signal, measuring an average of the magnitude of a ripple output of the reflection signal over a frequency range to determine the baseline return loss calibration. Thereafter, if the antenna is connected and the test signal is again swept over frequency, then a new ripple factor is determined for the antenna and a new mean output voltage for Vant is determined. By comparing the new average output voltage for Vant and the baseline return loss calibration, one can determine information about the performance of the antenna.
摘要:
An improved antenna system for use at high frequencies such as cellular communication and PCS frequencies, having a steerable, multi co-linear array antenna in which the number of radiating elements per co-linear array increases monotonically from the periphery of the antenna to the middle of the antenna, and wherein the antenna is connected to a Butler matrix feed network, thereby providing steerability of the radiation pattern associated with the antenna. The improved antenna system achieves significantly lower sidelobe generation as compared to antenna systems using multiple co-linear arrays of radiating elements in which the number of radiating elements per co-linear array is constant. The Butler matrix feed network is implemented via a microstrip fabricated printed circuit board without crossovers.
摘要:
A method is disclosed for determining a technician to dispatch to a customer site requiring a service call. A first plurality of technicians assigned to a customer site requiring a service call is determined. A location of each of the technicians is also determined. A first plurality of distances is determined between each of the technicians and a plurality of locations at which is disposed equipment needed for the service call. A second plurality of distances is determined between each of the technicians and a plurality of service vehicles at which is disposed the equipment needed for the service call. One of the technicians is dispatched to the customer site based on the location of each of the technicians, on the first plurality of distances, and on the second plurality of distances. A system for implementing the method is also disclosed.