Abstract: A circulator is used as a notch filter having a notch at a notch frequency band outside its frequency band of operation as a circulator. It has been observed that circulators operate as a notch filter at a relatively narrow band of operation outside its typical band of operation as a circulator. In certain embodiments, the circulator operates as a narrowband notch filter with sharp edges. Such a notch filter can be used between frequency bands carrying communications signals to reduce energy from one frequency band from spilling into a different frequency band. Since the notch has been observed to be relatively narrow and deep with sharp edges, such a notch filter can be used to reduce the guard bands between frequency bands, thereby increasing the amount of bandwidth that can de used to transmit communications signals. Furthermore, since a typical ferrite circulator is a relatively low cost component, the resulting notch filter can also be of low cost.

Abstract: A radiation source location technique includes focusing a plurality of receivers (i.e., antennas) at the same location. At least one determined characteristic of the radiation received at each receiver provides information regarding the source of that radiation relative to each receiver. Determining a relationship between the determined characteristics allows for determining when the source of radiation is at the location where the receivers are focused. One example includes using high directivity, narrow beamwidth antennas and time based markers from a wireless digital communication signal for locating a mobile unit source of radiation.

Abstract: A communication device (20) includes a wireless communication terminal (22) and a coupling device (24) that facilitates communications between the wireless terminal (22) and a physical line (26). The coupling device (24) includes a stripline conductor (40) that is placed near the antenna (30) of the wireless terminal to establish a proximity coupling between the strip line conductor and the antenna (30). Communication in either direction between the wireless terminal (22) and the physical line (26) are facilitated by the coupling device (24) of this invention.

Abstract: A radiation source location technique includes focusing a plurality of receivers (i.e., antennas) at the same location. At least one determined characteristic of the radiation received at each receiver provides information regarding the source of that radiation relative to each receiver. Determining a relationship between the determined characteristics allows for determining when the source of radiation is at the location where the receivers are focused. One example includes using high directivity, narrow beamwidth antennas and time based markers from a wireless digital communication signal for locating a mobile unit source of radiation.

Abstract: Disclosed is a side-lobe-modification antenna system comprising: an antenna including a base plate and an RF radiating arrangement attached to the base plate; and a side-lobe modifier bracket having a first planar surface and a second planar surface intersecting the first planar surface. The second planar surface can extend aside the base plate at an angle relative to the first planar surface. The first planar surface can be parallel to and abut the base plate.

Abstract: A circulator is used as a notch filter having a notch at a notch frequency band outside its frequency band of operation as a circulator. It has been observed that circulators operate as a notch filter at a relatively narrow band of operation outside its typical band of operation as a circulator. In certain embodiments, the circulator operates as a narrowband notch filter with sharp edges. Such a notch filter can be used between frequency bands carrying communications signals to reduce energy from one frequency band from spilling into a different frequency band. Since the notch has been observed to be relatively narrow and deep with sharp edges, such a notch filter can be used to reduce the guard bands between frequency bands, thereby increasing the amount of bandwidth that can de used to transmit communications signals. Furthermore, since a typical ferrite circulator is a relatively low cost component, the resulting notch filter can also be of low cost.

Abstract: A multi-band radial horn antenna is disclosed that has a precision 50 ohm feed air line to ensure a match to a 50 ohm transmission line. The feed probe of the antenna has a threaded section that allows the antenna to be tuned quickly and precise in the field to provide maximum antenna performance. Once adjusted, a small locking nut is tightened to retain the physical location position. The antenna is economical to build as it has only four major parts. In operation, the antenna was found to have a 1.15 to 1 Standing Wave Ratio, a decade of frequency bandwidth and a low angle of radiation.

Abstract: Disclosed is a side-lobe-modification antenna system comprising: an antenna including a base plate and an RF radiating arrangement attached to the base plate; and a side-lobe modifier bracket having a first planar surface and a second planar surface intersecting the first planar surface. The second planar surface can extend aside the base plate at an angle relative to the first planar surface. The first planar surface can be parallel to and abut the base plate.

Abstract: A multi-band radial horn antenna is disclosed that has a precision 50 ohm feed line to ensure a match to a 50 ohm transmission line. The feed probe of the antenna has a threaded section that allows the antenna to be tuned quickly and precise in the field to provide maximum antenna performance. Once adjusted, a small locking nut is tightened to retain the physical location position. The antenna is economical to build as it has only four major parts. In operation, the antenna was found to have a 1.15 to 1 Standing Wave Ratio, a decade of frequency bandwidth and a low angle of radiation.