Mark T. Montgomery - Melbourne Beach FL, US Frank M. Caimi - Vero Beach FL, US Mark W. Kishler - Rockledge FL, US
Assignee:
SkyCross, Inc. - Viera FL
International Classification:
H01Q 9/16
US Classification:
343820, 343844, 343850, 4555521
Abstract:
One or more embodiments are directed to a multimode antenna structure for transmitting and receiving electromagnetic signals in a communications device. The communications device includes circuitry for processing signals communicated to and from the antenna structure. The antenna structure is configured for optimal operation in a given frequency range. The antenna structure includes a plurality of antenna ports operatively coupled to the circuitry, and a plurality of antenna elements, each operatively coupled to a different one of the antenna ports. Each of the plurality of antenna elements is configured to have an electrical length selected to provide optimal operation within the given frequency range. The antenna structure also includes one or more connecting elements electrically connecting the antenna elements such that electrical currents on one antenna element flow to a connected neighboring antenna element and generally bypass the antenna port coupled to the neighboring antenna element. The electrical currents flowing through the one antenna element and the neighboring antenna element are generally equal in magnitude, such that an antenna mode excited by one antenna port is generally electrically isolated from a mode excited by another antenna port at a given desired signal frequency range without the use of a decoupling network connected to the antenna ports, and the antenna structure generates diverse antenna patterns.
Mark T. Montgomery - Melbourne Beach FL, US Frank M. Caimi - Vero Beach FL, US Mark W. Kishler - Rockledge FL, US
Assignee:
SkyCross, Inc. - Viera FL
International Classification:
H01Q 9/16
US Classification:
343820, 343844, 343850, 4555521
Abstract:
One or more embodiments are directed to a multimode antenna structure for transmitting and receiving electromagnetic signals in a communications device. The communications device includes circuitry for processing signals communicated to and from the antenna structure. The antenna structure is configured for optimal operation in a given frequency range. The antenna structure includes a plurality of antenna ports operatively coupled to the circuitry, and a plurality of antenna elements, each operatively coupled to a different one of the antenna ports. Each of the plurality of antenna elements is configured to have an electrical length selected to provide optimal operation within the given frequency range. The antenna structure also includes one or more connecting elements electrically connecting the antenna elements such that electrical currents on one antenna element flow to a connected neighboring antenna element and generally bypass the antenna port coupled to the neighboring antenna element. The electrical currents flowing through the one antenna element and the neighboring antenna element are generally equal in magnitude, such that an antenna mode excited by one antenna port is generally electrically isolated from a mode excited by another antenna port at a given desired signal frequency range without the use of a decoupling network connected to the antenna ports, and the antenna structure generates diverse antenna patterns.
Methods For Reducing Near-Field Radiation And Specific Absorption Rate (Sar) Values In Communications Devices
Mark T. Montgomery - Melbourne Beach FL, US Frank M. Caimi - Vero Beach FL, US Mark W. Kishler - Rockledge FL, US Li Chen - Melbourne FL, US
Assignee:
SkyCross, Inc. - Viera FL
International Classification:
H01Q 1/24
US Classification:
343702, 343820, 343844, 342159, 4555751, 4555755
Abstract:
A method is provided for reducing near-field radiation and specific absorption rate (SAR) values in a communications device. The communications device includes a multimode antenna structure transmitting and receiving electromagnetic signals and circuitry for processing signals communicated to and from the antenna structure. The method includes adjusting the relative phase between signals fed to neighboring antenna ports of the antenna structure such that a signal fed to the one antenna port has a different phase than a signal fed to the neighboring antenna port to provide antenna pattern control and to increase gain in a selected direction toward a receive point. The method features using a transmit power lower than the transmit power used in a non-pattern control operation of the antenna structure such that the communications device obtains generally equivalent wireless link performance with the receive point using reduced transmit power compared to the non-pattern control operation, thereby reducing the specific absorption rate.
Bing Chiang - Melbourne FL, US Michael Lynch - Merritt Island FL, US Douglas Wood - Palm Bay FL, US Thomas Liu - Melbourne FL, US Govind Kadambi - Melbourne FL, US Mark Kishler - Melbourne FL, US
Assignee:
InterDigital Technology Corporation - Wilmington DE
International Classification:
H01Q001/24
US Classification:
343702000, 343749000
Abstract:
A low profile smart antenna includes an active antenna element carried by a dielectric substrate, and active antenna element has a T-shape. Passive antenna elements are carried by the dielectric substrate, and they have an inverted L-shaped portion laterally adjacent the active antenna element. Impedance elements are selectively connectable to the passive antenna elements for antenna beam steering.