公开(公告)号：GB2394145A

公开(公告)日：2004-04-14

申请号：GB0223538

申请日：2002-10-10

Applicant: MOTOROLA INC

Inventor： GROSSMAN OVADIA ,  BEN-AYUN MOSHE ,  ROZENTAL MARK

IPC: H04B1/04 ,  H04B1/52

Abstract: A wireless communication unit (200) includes a transmitter (220) and an antenna 202. An isolator circuit 226 is coupled between the transmitter (220) and the antenna 202 and includes a first directional coupler 310 providing a first transmission path for routing a first portion of the transmit signal, and a second transmission path 320 for routing a second portion of the transmit signal. The first directional coupler is preferably a magic-T four-port device, also known as a 3 dB hybrid. A second coupler 340, is coupled to the first directional coupler 310, for combining the first portion of the transmit signal and the second portion of the transmit signal and providing a combined transmit signal to the antenna 202. The second coupler is preferably a 3 dB three-port device. An advantage of the invention is that a return path to the transmitter for signals reflected at the antenna has acceptable isolation, with minimised insertion loss.

公开(公告)号：GB2390777A

公开(公告)日：2004-01-14

申请号：GB0214694

申请日：2002-06-26

Applicant: MOTOROLA INC

Inventor： BEN-AYUN MOSHE ,  ROZENTAL MARK ,  GROSSMAN OVADIA

IPC: H04B7/185 ,  H04Q7/38

Abstract: A wireless communication system (100) includes a first cellular network (150) to serve terrestrial mobile stations and a second cellular network (110-1) to serve airborne mobile stations. Handover means facilitates handover of communications between the first network and the second network by producing information relating to the location of the mobile station (170) and deriving from this information a list of selected cells to be scanned by the mobile station for prospective handover. A wireless subscriber unit and method of cell re-selection are also described. In this manner, calls are not dropped when transferring a call from, say, an AGA non-terrestrial cell to a terrestrial cell.

公开(公告)号：GB2390265A

公开(公告)日：2003-12-31

申请号：GB0214695

申请日：2002-06-26

Applicant: MOTOROLA INC

Inventor： BEN-AYUN MOSHE ,  ROZENTAL MARK ,  GROSSMAN OVADIA

IPC: H04B7/185 ,  H04W36/14 ,  H04Q7/38

Abstract: A wireless communication system (200) supports cell handover between terrestrial cells (250)and non-terrestrial cells(210-240), where each cell incorporates a wireless serving base unit serving a plurality of subscriber units with a communication resource. An airborne-capable subscriber unit (270) is capable of communicating to both terrestrial based cells and non-terrestrial based cells and receives transmissions from one or more base unit(s). The subscriber unit calculates a rate of change of the received one or more signal levels and determines whether to hand over communication from a non-terrestrial cell to a terrestrial cell based on the calculation. In a second embodiment, the subscriber unit recognizes a substantially simultaneous increase in received signal levels from a plurality of terrestrial base units and hands over the communication to a terrestrial base unit. A wireless subscriber unit and method for determining when to handover are also described. In this manner, by early determination of a handover need, calls are not dropped when the subscriber unit is landing, or severe interference caused when the unit is taking off.

公开(公告)号：GB2380323A

公开(公告)日：2003-04-02

申请号：GB0123502

申请日：2001-09-29

Applicant: MOTOROLA INC

Inventor： GROSSMAN OVADIA ,  BEN-AYUN MOSHE ,  ROZENTAL MARK

IPC: H01Q1/36 ,  H01Q9/36 ,  H01Q11/08

Abstract: An antenna for use in a mobile radio communication unit has a helical coil portion 3 located between and electrically connected to two further portions, namely a second portion 5 having a conductive stub for connection to the radio unit, and a third portion 7 comprising a conductive capacitive cylinder or curved plate. The length of the antenna is not greater than 100 mm, preferably not greater than 0.1 g . The antenna has applications in TETRA digital communications. Superior return loss and bandwidth characteristics are claimed.

公开(公告)号：GB2466072B

公开(公告)日：2011-03-23

申请号：GB0822730

申请日：2008-12-12

Applicant: MOTOROLA INC

Inventor： AYUN MOSHE BEN ,  BEN-SALMON AVI ,  GROSSMAN OVADIA ,  ROZENTAL MARK

IPC: H03F1/32

Abstract: An integrated circuit includes a linearizer circuit in which excessive delay is compensated. The linearizer circuit includes a power amplifier, forward and feedback paths, and a microprocessor. A signal from the power amplifier is routed by the forward path to be transmitted while a portion of the signal to be transmitted is routed back to the power amplifier via the feedback path. The microprocessor applies phase training signals to the forward path. The microprocessor uses the phase training signals to determine the amount of delay in the linearizer circuit and alters the frequency position of poles and zeros in the linearizer circuit to compensate for the delay. The gain of the linearizer circuit is also altered by the microprocessor depending on the measured delay.

公开(公告)号：GB2460274B

公开(公告)日：2010-08-04

申请号：GB0809412

申请日：2008-05-23

Applicant: MOTOROLA INC

Inventor： BEN-AYUN MOSHE ,  GROSSMAN OVADIA ,  ROZENTAL MARK

IPC: H04B1/10 ,  H03D7/16 ,  H04B1/30

公开(公告)号：GB2466072A

公开(公告)日：2010-06-16

申请号：GB0822730

申请日：2008-12-12

Applicant: MOTOROLA INC

Inventor： AYUN MOSHE BEN ,  BEN-SALMON AVI ,  GROSSMAN OVADIA ,  ROZENTAL MARK

IPC: H03F1/32

Abstract: Loop delay in a Cartesian feedback linearised transmitter is computed during a training episode from the settings of the phase shifter 242 required to achieve phase quadrature balance at two frequencies. The pole and zero frequencies of the loop filters 206,209, and the DC loop gain, are then adapted in dependence on the loop delay to maintain stability of the Cartesian loop while minimizing adjacent channel power. If the delay is found to be excessive the transmitter bandwidth may be reduced or the transmitter may be operated in an open loop mode. Improved loop stability allows a Cartesian loop transmitter to be used for broadband signals such as LTE (Long Term Evolution), WiMax, WCDMA and EDGE.

公开(公告)号：GB2460274A

公开(公告)日：2009-11-25

申请号：GB0809412

申请日：2008-05-23

Applicant: MOTOROLA INC

Inventor： BEN-AYUN MOSHE ,  GROSSMAN OVADIA ,  ROZENTAL MARK

IPC: H03D7/18 ,  H03D7/16 ,  H04B1/30

Abstract: A wireless communication receiver 200 includes a primary RF quadrature mixer 242, 248 and chopping mixer stages 226, 228, 250, 252 (also referred to as dynamic matching mixers) located on each side of the primary quadrature mixer. When active, the chopping mixers translate second order intermodulation products out of the band of interest. The receiver also includes an off-channel signal detector 218. The off-channel signal detector 218 is arranged to detect when an off-channel interfering signal level exceeds a threshold and, in response, to activate at least one of the chopping mixer stages. The chopping mixers are de-activated, or bypassed, when the off-channel signal level is below a threshold, allowing the receiver to operate acceptably with a lower lP2 performance, but with beneficially reduced current consumption. The chopping mixers are controlled autonomously by the off-channel detector so that the receiver is able to react very quickly.

公开(公告)号：GB2453160B

公开(公告)日：2009-09-30

申请号：GB0718929

申请日：2007-09-28

Applicant: MOTOROLA INC

Inventor： BEREZIN MAKSIM ,  ASTANOVSKY MICHAEL ,  GROSSMAN OVADIA

IPC: H01Q9/04 ,  H01Q5/00 ,  H01Q5/10 ,  H01Q5/357 ,  H01Q13/10

公开(公告)号：GB2453160A

公开(公告)日：2009-04-01

申请号：GB0718929

申请日：2007-09-28

Applicant: MOTOROLA INC

Inventor： BEREZIN MAKSIM ,  ASTANOVSKY MICHAEL ,  GROSSMAN OVADIA

IPC: H01Q9/04 ,  H01Q1/24 ,  H01Q5/10 ,  H01Q5/357

Abstract: A patch antenna comprises a dielectric substrate 101 on which there is a resonant patch 107 formed with at least two slots 117, 119. The patch 107 may be formed on a circuit board type substrate, such as FR4. A microstrip feed 113 may be arranged on the same surface 103 of the substrate 101 as the patch 107 such that it is in direct contact with an edge 108 of the patch 107. An earth connection 114 and a signal connection 116 may be made to the said microstrip feed 113. The patch 107 may be directly driven while the slots 117, 119 may be driven to resonance by electromagnetic coupling arrangements. The patch 107 may have radiating edges 106, 108 and non-radiating edges 102, 104. The slots 117, 119 may be arranged with a short open ended portion propagating into the patch from respective non-radiating edges 102, 104 with a larger slot portion running parallel with the said edges. Specific dimensions associated with the location and slot parameters may be used to obtain desired operational characteristics. A conductive ground frame 200 may be arranged with a separation layer from the substrate 101 to obtain the desired antenna resonance performance. The antenna provides a compact, broadband or multi-band antenna for mobile devices.