Abstract: An antenna system having a dynamic radiation pattern is provided. The antenna system comprises at least one antenna unit that includes an antenna dipole, a plurality of reflectors disposed around the antenna dipole, and a plurality of switches each corresponding to one of the reflectors. Each of the switches is coupled between the corresponding reflector and an electrical ground of the antenna system. The antenna system further includes a control unit configured to dynamically change a radiation pattern of the antenna system by controlling the plurality of switches.

Abstract: Techniques of designing an antenna array or antenna system are described. The antenna system includes a plurality of antenna units structured in a way to form a desired antenna pattern. According to one aspect of the present invention, each of the antenna units includes two antennas disposed orthogonally or in parallel. These antenna units are arranged in a pre-defined geometric pattern to create two substantially similar main beam radiation characteristics for independent polarizations.

Abstract: An antenna system having a dynamic radiation pattern is provided. The antenna system comprises at least one antenna unit that includes an antenna dipole, a plurality of reflectors disposed around the antenna dipole, and a plurality of switches each corresponding to one of the reflectors. Each of the switches is coupled between the corresponding reflector and an electrical ground of the antenna system. The antenna system further includes a control unit configured to dynamically change a radiation pattern of the antenna system by controlling the plurality of switches.

Abstract: Techniques of designing an antenna array with antenna units controlled electronically are described. Through controlling the combination of the reflectors in each of the antenna units, a desired antenna pattern is formed, adapting to the environment, and providing reliable and efficient links between two transceivers. According to one aspect of the present invention, a switch (e.g., a diode) is used to couple two reflectors. The diode is controlled to be on or off so that the reflectors are conductively integrated or separated.

Abstract: Techniques of designing a smart antenna system are described. An antenna system includes at least two integrated antenna units arranged with a predefined angular angle therebetween to form a desired antenna pattern without any significant nulls. According to one aspect of the techniques, at least two sets of antenna units are interlaced but polarized differently to form an integrated antenna unit. Each of the antenna units is formed with an array of antennas. The antennas in an array or the antenna units in an integrated antenna unit can be selectively energized to form a desired antenna pattern in accordance with a signal determined from radio frequency signals communicated between a device equipped with the antenna system and another device (e.g., a Wi-Fi router in communication with a mobile device), where the desired antenna pattern provides an optimized antenna pattern to facilitate seamless or QoS communication between the two devices.

Abstract: Techniques of designing an antenna array with antenna units controlled electronically are described. Each of the antenna units includes a reflector, a driven element and one or more directors. A substrate with conductive material on its surface provided to support the antenna array is designed to be the reflector. The driven element is separated into two halves with each on one side of a non-metal substrate vertically bonded to the conductive substrate. Two driving lines provided to drive the two halves of the driven element are disposed on both sides of the non-metal substrate to minimize possible interactions with other elements of the antenna unit or the antenna array.

Abstract: Techniques of designing an antenna array with antenna units controlled electronically are described. Each of the antenna units includes a reflector, a driven element and one or more directors. A substrate with conductive material on its surface provided to support the antenna array is designed to be the reflector. The driven element is separated into two halves with each on one side of a non-metal substrate vertically bonded to the conductive substrate. Two driving lines provided to drive the two halves of the driven element are disposed on both sides of the non-metal substrate to minimize possible interactions with other elements of the antenna unit or the antenna array.

Abstract: Techniques of designing an antenna array with antenna units controlled electronically are described. Through controlling the combination of the reflectors in each of the antenna units, a desired antenna pattern is formed, adapting to the environment, and providing reliable and efficient links between two transceivers. According to one aspect of the present invention, a switch (e.g., a diode) is used to couple two reflectors. The diode is controlled to be on or off so that the reflectors are conductively integrated or separated.

Abstract: Techniques of designing an antenna array or antenna system are described. The antenna system includes a plurality of antenna units structured in a way to form a desired antenna pattern. According to one aspect of the present invention, each of the antenna units includes two antennas disposed orthogonally or in parallel. These antenna units are arranged in a pre-defined geometric pattern to create two substantially similar main beam radiation characteristics for independent polarizations.

Abstract: Techniques of designing an antenna array or antenna system are described. The antenna system includes a plurality of antenna units structured in a way to form a desired antenna pattern. According to one aspect of the present invention, each of the antenna units includes two antennas orthogonally disposed. These antenna units are arranged in a pre-defined geometric pattern to create two substantially similar main beam radiation characteristics for independent polarizations.

Abstract: Techniques of designing a smart antenna system are described. An antenna system includes at least two integrated antenna units arranged with a predefined angular angle therebetween to form a desired antenna pattern without any significant nulls. According to one aspect of the techniques, at least two sets of antenna units are interlaced but polarized differently to form an integrated antenna unit. Each of the antenna units is formed with an array of antennas. The antennas in an array or the antenna units in an integrated antenna unit can be selectively energized to form a desired antenna pattern in accordance with a signal determined from radio frequency signals communicated between a device equipped with the antenna system and another device (e.g., a Wi-Fi router in communication with a mobile device), where the desired antenna pattern provides an optimized antenna pattern to facilitate seamless or QoS communication between the two devices.

Abstract: A short wave omnidirectional antenna for the 26 Megahertz band provides line-of-sight broadcasting at comparatively low power to serve local communities while suppressing sky wave propagation. Sky wave suppression is achieved by a critically configured reflector above the radiator or by a co-located second active or parasitic radiator spaced to achieve sufficient beam tilt to create a null at critical angles, generally from the horizon to thirty degrees above. This arrangement allows local broadcasts to be originated at numerous sites despite the narrow extent of the band (330 kHz) and the narrow (10 kHz) channel width. Among other possible applications, the antenna supports transmission using the Digital Radio Mondiale® (DRM®) system for COFDM. COFDM technology can suppress ghosting and most noise, while low emission angle of the antenna and low intended transmitter power largely prevent interference between broadcasts at moderate distances.

Abstract: A slot antenna is described. The slot antenna includes a waveguide having a first side, a second side, a third side, and a fourth side, a closed end and an open end. The second side extends substantially perpendicularly from a first end of the first side. The third side extends substantially perpendicularly from a second end of the first side. The fourth side extends between the second side and the third side with the fourth side substantially parallel to the first side. The sides and the closed end form a cavity. A feeding point is located substantially midway between the first end of the first side and the second end of the first side. A T-Bar is located inside the cavity, the T-bar having a center member extending from the feeding point into the cavity and a cross member having a length extending across the cavity between the second side and the third side.

Abstract: A slot antenna is described. The slot antenna includes a waveguide having a first side, a second side, a third side, and a fourth side, a closed end and an open end. The second side extends substantially perpendicularly from a first end of the first side. The third side extends substantially perpendicularly from a second end of the first side. The fourth side extends between the second side and the third side with the fourth side substantially parallel to the first side. The sides and the closed end form a cavity. A feeding point is located substantially midway between the first end of the first side and the second end of the first side. A T-Bar is located inside the cavity, the T-bar having a center member extending from the feeding point into the cavity and a cross member having a length extending across the cavity between the second side and the third side.

Abstract: A slot antenna is described. The slot antenna includes waveguide having a first side, a second side, a third side, and a fourth side, a closed end and an open end. The second side extends substantially perpendicularly from a first end of the first side. The third side extends substantially perpendicularly from a second end of the first side. The fourth side extends between the second side and the third side with the fourth side substantially parallel to the first side. The sides and the closed end form a cavity. A feeding point is located substantially midway between the first end of the first side and the second end of the first side. A T-Bar is located inside the cavity, the T-bar having a center member extending from the feeding point into the cavity and a cross member having a length extending across the cavity between the second side and the third side.