公开(公告)号：MY121293A

公开(公告)日：2006-01-28

申请号：MYPI9801349

申请日：1998-03-26

Applicant: QUALCOMM INC

Inventor： DANIEL FILIPOVIC ,  ALI TASSOUDJI ,  TIDWELL STEPHEN B ,  ODENWALDER JOSEPH P ,  TIEDEMANN EDWARD G JR ,  YU-CHEUN JOU

IPC: H01Q1/36 ,  H01Q1/38 ,  H01Q5/00 ,  H01Q5/378 ,  H01Q5/40 ,  H01Q11/08 ,  H01Q21/28

Abstract: A DUAL-BAND HELICAL ANTENNA PROVIDES OPERATION IN TWO FREQUENCY BANDS. THE DUAL-BAND HELICAL ANTENNA INCLUDES TWO SINGLE-BAND ANTENNAS BANDS. THE DUAL-BAND HELICAL ANTENNA INCLUDES TWO SINGLE-BAND ANTENNAS (1304, 1308), EACH HAVING A FEED NETWORK (1804, 1808), A GROUND PLANE (412) OPPOSITE THE FEED NETWORK, AND A SET OF ONE OR MORE RADIATORS (104A TO 104D) EXTENDING FROM FEED NETWORK. A TAB (1504) EXTENDS FROM THE FEED NETWORK OF ONE OF THE ANTENNAS WHICH PROVIDES A FEED FOR THAT ANTENNA. THE TAB (1504) ALSO PROVIDES A PATH FOR CURRENT TO FLOW FROM THE RADIATORS OF THE SECOND ANTENNA ALONG THE AXIS OF THE SECOND ANTENNA TO THEREBY INCREASE THE ENERGY RADIATED IN THE DIRECTIONS PERPENDICULAR TO THE AXIS. THE GROUND PLANE OF ONE ANTENNA IS USED AS A SHORTING RING FOR THE OTHER ANTENNA.

公开(公告)号：MY127914A

公开(公告)日：2006-12-29

申请号：MYPI20010962

申请日：2001-03-02

Applicant: QUALCOMM INC

Inventor： SAED YOUNIS ,  THOMAS WILBORN ,  DANIEL FILIPOVIC ,  JIAN LIN ,  EMILIJA SIMIC ,  HAITAO ZHANG ,  RALPH KAUFMAN

IPC: H04B1/04 ,  H03G3/20 ,  H04L27/04 ,  H03G3/30 ,  H04B7/005 ,  H04B7/24

Abstract: TRANSMITTER ARCHITECTURES FOR A COMMUNICATIONS SYSTEM HAVING IMPROVED PERFORMANCE OVER CONVENTIONAL TRANSMITTER ARCHITECTURES.THE IMPROVEMENTS INCLUDE A COMBINATION OF THE FOLLOWING: FASTER RESPONSE TIME FOR THE CONTROL SIGNALS (PA_ON, PA_R, PA_RI, PA_RU, VGA_GAIN, TX_AGC, OS_GAIN), IMPROVED LINEARITY, REDUCED INTERFERENCE, REDUCED POWER CONSUMPTION, LOWER CIRCUIT COMPLEXITY, AND LOWER COSTS. FOR A CELLULAR APPLICATION, THESE IMPROVEMENTS CAN LEAD TO INCREASED SYSTEM CAPACITY, SMALLER TELEPHONE SIZE, INCREASED TALK AND STANDBY TIMES, AND GREATER ACCEPTANCE OF THE PRODUCT. CIRCUITRY IS PROVIDED TO SPEED UP THE RESPONSE TIME OF A CONTROL SIGNAL. THE CONTROL LOOP FOR VARIOUS ELEMENTS IN THE TRANSMIT SIGNAL PATH ARE INTEGRATED. A GAIN CONTROL MECHANISM ALLOWS FOR ACCURATE ADJUSTMENT OF THE OUTPUT TRANSMIT POWER LEVEL. CONTROL MECHANISMS ARE PROVIDED TO POWER DOWN THE POWER AMPLIFIER (128, 840), OR THE ENTIRE TRANSMIT SIGNAL PATH, WHEN NOT NEEDED. THE GAINS OF THE VARIOUS ELEMENTS IN THE TRANSMIT SIGNAL PATH ARE CONTROLLED TO REDUCE TRANSIENTS IN THE OUTPUT TRANSMIT POWER, AND TO ALSO ENSURE THAT TRANSIENTS ARE DOWNWARD.(FIG 1)