Method for controlling an input impedance of an antenna ( 100 ). The method can include the steps of coupling RF energy from an input RF transmission line ( 106 ) to an antenna radiating element ( 102 ) through an aperture ( 112 ) defined in a ground plane ( 110 ). For example, the aperture ( 112 ) can be a slot and the radiating element ( 102 ) can be a patch type element. The input impedance can thereafter be controlled by selectively varying a volume or a position of a conductive fluid ( 128 ) disposed in a predetermined region between the RF transmission line and the antenna radiating element. The volume of conductive fluid ( 128 ) can be automatically varied in response to at least one control signal ( 132 ).

Shaped ground plane for dynamically reconfigurable aperture coupled antenna

An antenna (100) includes at least one antenna radiating element (108, 110) and a dielectric structure (102) defining a cavity containing a fluid dielectric (106). The dielectric structure (102) can be a dielectric circuit board substrate with a ground plane (116) provided opposed to the antenna radiating elements (108, 110). The fluid dielectric (106) is electrically and magnetically coupled to the antenna radiating element. Further, a composition processor (301) is provided for selectively varying a composition of the fluid dielectric (106) so as to dynamically change an electrical characteristic of the antenna radiating element (108) in response to a control signal.

Antenna with dynamically variable operating band

Disclosed are a method and an apparatus for active scanning in a wireless LAN. In the method for active scanning in the wireless LAN, a scanning STA, which has received from a different STA a first probe request frame, can start a probe timer and perform a clear channel assessment (CCA) for detecting a channel state of a receiving channel. When the channel state is not busy until the probe timer reaches a minimum channel time, the scanning STA transmits to an AP from the receiving channel a second probe request frame, and when the channel state is busy until the probe timer reaches the minimum channel time and the scanning STA does not receive a probe reply frame, which includes at least the same information expected to be received based on scanning information, the scanning STA can transmit to the AP from the receiving channel the second probe request frame.

Method and apparatus for active scanning in wireless lan

Techniques for dynamically switching between synchronous and asynchronous operation modes in body area networks (BANs). One embodiment includes a method (400) for transitioning from an asynchronous mode to a synchronous mode in a medium access control (MAC) of a BAN. A device receiving a switch mode command (S410) performs the acts comprising: setting a timer to a time period specified in the switch mode command (S430); propagating the received switch mode command to other devices in the BAN (S440); upon expiration of the time period, tuning to a channel selected from a set of channels reserved for the synchronous mode (S460); and initializing a device to operate as either a master device or a slave device in the synchronous mode of operation (S470). Another embodiment includes a method (300) for transitioning from a synchronous mode to an asynchronous mode in a MAC of a body area networks (BAN).

Techniques for dynamically switching between synchronous and asynchronous operation modes in body area networks

A method and a system for processing dictated information into a dynamic form are disclosed. The method comprises presenting an image (3) belonging to an image category to a user, dictating a first section of speech associated with the image category, retrieving an electronic document having a previously defined document structure (4) associated with the first section of speech, thus associating the document structure (4) with the image (3), wherein the document structure comprises at least one text field, presenting at least a part of the electronic document having the document structure (4) on a presenting unit (5), dictating a second section of speech and processing the second section of speech in a speech recognition engine (6) into dictated text and associating the dictated text with the text field.

Method and system for processing dictated information

A shielding apparatus for EMI-sensitive electronic components, especially for radio transmitting devices and/or radio receiving devices of telecommunication terminals for contactless telecommunication, such as cordless telephones and mobile telephones and similar, which can be constructed without using expensive manufacturing and assembly steps without any extra space requirement. The EMI-sensitive electronic components and/or circuits are arranged on a separate, at least double-layered printed circuit board and are embodied as a printed circuit board module. Said circuit board and another separate, at least two-layered circuit board which includes a recess for the EMI-sensitive electronic components and/or circuits and which is embodied in the form of a base printed circuit board, are joined together by soldering, preferably in the region of contact areas, to form a unit such that a cage is formed by the recess which is disposed between two metal surfaces being respectively connected to the shielding surfaces by means of continuous, highly adjacent contacts. The cage shields the EMI-sensitive electronic components and/or circuits on all sides.

Shielding for emi-endangered electronic components and/or circuits of electronic devices

In order to be able to control the creation of a user channel connection in a communication system using wireless communication between at least one mobile part and one wired part in such a way that a user channel connection is established more quickly upon a connection request indicated by the mobile part or the wired part for the purpose of transmitting user data and, at the same time, due to market requirements, no synchronization pulses are sent by the wired part in the idle state, an initiating device of the communication system (for example, for an incoming call: base station; for an outgoing call: mobile part) sends, from an asynchronous idle state, synchronization pulses (SB) to all available physical resources. Due to the plurality of the sent, available synchronization pulses (SB), rapid synchronization is ensured because the probability is sufficiently increased thereby that a pulse will fall in the search window of a receiver.

Device and method for controlling the creation of a user channel connection in a communication system and associated communication system, digital storage medium, computer program product, and computer program

The invention relates to a radio transmitter/radio receiver unit which is capable of transmitting and receiving in different frequency ranges with a stable antenna gain that remains practically constant. According to the invention, a dielectric body, whose dielectricity can be modified is placed in the vicinity of an antenna body. A control unit supplies a d.c. voltage to the antenna which causes the dielectricity of the dielectric body to be modified. The control unit modifies the d.c. voltage value until the dielectricity guarantees an optimum value for at least one physical input variable, which represents the reception and transmission quality.

Radio transmitter/radio receiver unit comprising a tuneable antenna

A screening device for screening of electromagnetic radiation at and from electronic components (T) has a first screening chamber (A) and at least a second screening chamber (B). The screening device has an integral design, wherein the at least second chamber forms an inner chamber (B) which lies within the first screening chamber (A), and the inner chamber (B) is more specifically is additionally fixed to the first screening chamber via a crimp-connection.

lectromagnetic radiation SMD-screening device especially in mobile radio devices or mobile phones

A mobile radio transmitting and receiving device with a tunable antenna wherein, in order to provide a transmission/reception capability in different frequency bands, with a virtually constant, stable antenna gain, with the radio transmitting and receiving device, a dielectric body which is mounted such that it can be moved is guided by adjusting part, which are controlled by a control device, in a near area of an antenna body, such that the extent of an overlap of the two bodies in the near area of the antenna body is changed until at least one physical input variable, which represents the reception and transmission quality, reaches an optimum.

Matthias Lungwitz

Papers

Shielding for emi-endangered electronic components and/or circuits of electronic devices

Device and method for controlling the creation of a user channel connection in a communication system and associated communication system, digital storage medium, computer program product, and computer program

Radio transmitter/radio receiver unit comprising a tuneable antenna

lectromagnetic radiation SMD-screening device especially in mobile radio devices or mobile phones

Mobile radio transmitting/receiving device comprising a tunable-antenna