摘要:
A waveguide connector for connecting an elliptical waveguide to a rectangular waveguide includes an elliptical-waveguide-receiving portion adapted to receive an end portion of an elliptical waveguide. The waveguide connector also includes a rectangular-waveguide-connecting portion adapted to connect to an end portion of a rectangular waveguide. After the end portion of the elliptical waveguide has been received in the elliptical-waveguide-receiving portion of the waveguide connector, the elliptical waveguide and the waveguide connector are soldered together. The rectangular-waveguide-connecting portion of the waveguide connector includes a flange with attachment points therein. The rectangular-waveguide-connecting portion of the waveguide connector is attached to a rectangular waveguide through the attachment points via screws, bolts, or the like. One embodiment of the waveguide connector includes unitary construction wherein a stepped transformer having transition sections is formed therewith.
摘要:
A surge protector comprises a coaxial through-section having a first inner conductor, a first outer conductor, and a first dielectric disposed between the first inner conductor and the first outer conductor, and a coaxial shorting stub having a second inner conductor and a second outer conductor. The stub has a first end and a second end. The stub being coupled to the coaxial through-section wherein the second inner conductor is conductively coupled to the first inner conductor at the first end of the stub and the second outer conductor is conductively coupled to the first outer conductor at the first end of the stub. The second inner conductor is substantially hollow. The second inner conductor has at least one helical aperture disposed therein. The at least one helical aperture is continuous for at least about one revolution around the second inner conductor. A shorting plate is conductively coupled to the second inner and second outer conductors at the second end of the stub.
摘要:
A corrugated coaxial cable including a core with at least one inner conductor and a highly expanded polymeric foam dielectric surrounding the inner conductor. This coaxial cable has a corrugated outer conductor closely encapsulating the foam dielectric. The corrugated coax cable has a velocity of propagation of greater than 90% of the speed of light, resulting in improved signal propagation characteristics, especially in attenuation, while still maintaining the high flexibility and bending properties which are characteristic of corrugated coaxial cables designs.
摘要:
A planar antenna array for linearly polarized waves is proposed which offers a technique of improving the radiation pattern of the antenna by compensating for amplitude and phase imbalance due to coupling between adjacent lines in the feed network. This imbalance causes the radiation patterns to be severely distorted. The proposed configuration uses slots offset in certain parts of the array and then bonds the slots to an aperture/waveguide layer and produces an antenna with good gain, good match over a wide frequency band and good cross polar discrimination as well as providing an improvement in the overall radiation pattern of the antenna.
摘要:
A repeater for transmitting and receiving radio frequency (RF) signals to and from a pager. The repeater includes a forward path for receiving a first RF signal from a base station and a reverse path for receiving a pager signal from a pager. The forward path includes a channelizer which down converts the first RF signal to an intermediate frequency (IF) signal, amplifies the IF signal, and up converts the IF signal to a second RF signal suitable for transmission to a pager. The reverse path includes a second amplifier which amplifies the pager signal to an amplified signal suitable for transmission to a base station antenna.
摘要:
A flange adaptor assembly for coupling a waveguide to any number of flange interfaces, wherein the assembly includes a flange adaptor having a predetermined flange coupling interface. The flange adaptor of the present invention is constructed for engaging the common adaptor side of a number of waveguide flanges, while being semi-permanently secured to the end of a waveguide. The flange interface side of the waveguide flanges varies in accordance with the flange interface to which the waveguide is to be connected. In this manner, a single waveguide can be manufactured and assembled for use with multiple waveguide flanges.
摘要:
A dry gas production system (10) for supplying dry gas to a pressurized space, such as an underground conduit or an aerial cable. The dry gas production system (10) may include a modular enclosure (12) that has a removable support (28) to which multiple dry gas production modules (30,32) are mounted. The support may be a mobile rack wheeled inside the enclosure and likewise removed from the enclosure (12) while supporting the dry gas production modules (30,32). The dry gas production system may include multiple dry gas production modules that are operated as required to meet the dry gas demand for the pressurized space. The module compressor may include a variable frequency drive for driving the compressor motor at different speeds and may optionally include a mount with vibration isolation.
摘要:
A transmitter comprises an amplifier operable for receiving an input signal and amplifying the input signal to produce an output signal. A power supply is coupled to the amplifier for supplying power to the amplifier, the power supply operable for tracking the input signal and varying the level of power supplied to the amplifier in response to variation of the input signal. A predistortion circuit is coupled to the power supply, the predistortion circuit operable for receiving the input signal and predistorting the input signal to the power supply for addressing input signal tracking capabilities of the power supply.
摘要:
An antenna system incorporating at least two pluralities of antennas 12, 27 circumferentially arranged with a side-by-side relationship about a monopole tower 15. The main beam direction of the radiation pattern emanating from each antenna 10 may be remotely adjusted in elevation and/or azimuth. The main beam direction of the radiation pattern emanating from adjacent antennas 10 may be varied independently. The antennas may be partitioned in one or more vertically-spaced groups 12, 27 each of which is arranged about a circumference of the monopole tower 15.