Abstract: The present disclosure relates to a method of preparing a polymer, which includes: adding an alkyl-substituted aromatic vinyl-based monomer and a vinyl cyanide-based monomer to a reactor and initiating polymerization; and performing polymerization while continuously adding an alkyl-substituted aromatic vinyl-based monomer and a multifunctional initiator to the reactor, wherein the continuous addition of the alkyl-substituted aromatic vinyl-based monomer and the multifunctional initiator is initiated when a polymerization conversion rate is 10 to 30%, and the continuous addition of the alkyl-substituted aromatic vinyl-based monomer and the multifunctional initiator is terminated when a polymerization conversion rate is 70 to 80%.

Abstract: Systems and methods are provided for an antenna switch module (300) for an electronic device (302) including wireless communication circuitry (308) and an antenna (304) configured to transmit and receive signals over a plurality of frequency bands. The antenna switch module may include a plurality of antenna switches (310, 312) positioned in series and configured to pass signals between the antenna and wireless communication circuitry and to selectively operate in one of the bands. The first antenna switch (310) may include a plurality of pins (314) arranged in a first configuration, and the second antenna switch (312) may include a plurality of pins (316) arranged in a second configuration that is a mirror image of the first configuration. The antenna switch module may further include a plurality of non-overlapping signal paths (318) configured to selectively deliver signals between the antenna switches, each signal path being associated with a respective band.

Abstract: Systems and methods are provided for arranging antennas in an electronic device (200). According to one aspect, the electronic device includes a housing (202) and an antenna arrangement. The antenna arrangement includes a first volume (206) positioned adjacent to an edge (212) of the housing, the first volume enclosing a first antenna structure (230) shaped substantially according to a geometry of the edge; a second volume (208) positioned adjacent to a first corner (216) of an opposing edge (214) of the housing, the second volume including a second antenna structure (232) shaped substantially according to a geometry of the first corner; and a third volume (210) adjacent to a second corner (218) of the opposing edge, the third volume including a third antenna structure (234) shaped substantially according to a geometry of the second corner, wherein the first, second, and third volumes do not overlap and are discontinuous.

Abstract: Systems and methods are provided for an antenna structure (100) configured for attachment to a circuit board (102). The antenna structure includes a main body (103) having a first end (105), a second end (107) opposite from the first end, and a side (109) extending between the first end and the second end. The antenna structure further includes a first support (104) formed from the first end, a second support (106) formed from the second end, and a third support (108) extending from the side of the main body. The main body, the first support, the second support, and the third support are formed from a single conductive sheet. Each of the supports is mechanically attached to the circuit board, and only one of the supports is electrically coupled to an antenna feed of the circuit board.

Abstract: Systems and methods are provided for an antenna switch module (300) for an electronic device (302) including wireless communication circuitry (308) and an antenna (304) configured to transmit and receive signals over a plurality of frequency bands. The antenna switch module may include a plurality of antenna switches (310, 312) positioned in series and configured to pass signals between the antenna and wireless communication circuitry and to selectively operate in one of the bands. The first antenna switch (310) may include a plurality of pins (314) arranged in a first configuration, and the second antenna switch (312) may include a plurality of pins (316) arranged in a second configuration that is a mirror image of the first configuration. The antenna switch module may further include a plurality of non-overlapping signal paths (318) configured to selectively deliver signals between the antenna switches, each signal path being associated with a respective band.

Abstract: Systems and methods are provided for arranging antennas in an electronic device (200). According to one aspect, the electronic device includes a housing (202) and an antenna arrangement. The antenna arrangement includes a first volume (206) positioned adjacent to an edge (212) of the housing, the first volume enclosing a first antenna structure (230) shaped substantially according to a geometry of the edge; a second volume (208) positioned adjacent to a first corner (216) of an opposing edge (214) of the housing, the second volume including a second antenna structure (232) shaped substantially according to a geometry of the first corner; and a third volume (210) adjacent to a second corner (218) of the opposing edge, the third volume including a third antenna structure (234) shaped substantially according to a geometry of the second corner, wherein the first, second, and third volumes do not overlap and are discontinuous.

Abstract: An antenna includes a U-shaped radiator portion having a first extending arm and a second extending arm parallel and adjacent the first extending arm and coupled to the first extending arm by a junction portion, where the first and second extending arms and the junction portion defining a slot. The antenna further includes a ground plane physically coupled only to the first extending arm and a distributed feed element disposed at least partially within the slot and operable to radiate electromagnetic signals within a first frequency range and electrically excite at least portions of the radiator portion at at least a second frequency range having frequencies outside the first frequency range, thereby causing the radiator portion to radiate electromagnetic signals within the second frequency range.

Abstract: An antenna includes a U-shaped radiator portion having a first extending arm and a second extending arm parallel and adjacent the first extending arm and coupled to the first extending arm by a junction portion, where the first and second extending arms and the junction portion defining a slot. The antenna further includes a ground plane physically coupled only to the first extending arm and a distributed feed element disposed at least partially within the slot and operable to radiate electromagnetic signals within a first frequency range and electrically excite at least portions of the radiator portion at at least a second frequency range having frequencies outside the first frequency range, thereby causing the radiator portion to radiate electromagnetic signals within the second frequency range.

Abstract: An antenna module for a cellular phone which is capable of minimizing the effect of electromagnetic radiation of the cellular phone on the human body and enhancing the quality of speech of the cellular phone. The antenna module comprises two helix antennas installed in the cellular phone transversally apart from each other, and a power supply unit connected to the helix antennas for applying two power signals with the same power level and opposite phases respectively to the helix antennas. This antenna module is able to radiate a minimized amount of electromagnetic waves in the longitudinal direction of the cellular phone, or toward either the top or rear part of the cellular phone, and an increased amount of electromagnetic waves in the transversal direction of the cellular phone, respectively, thereby minimizing electromagnetic radiation to the human body while at the same time enhancing the quality of speech of the cellular phone.