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Fault Detection

Active-receiving-antenna

Method and apparatus for testing a connection between digital processing modules, such as in digital printing

We claim: 1. A method of testing a connection between a first module and a second module, the first ...

Testing circuitry of internal peripheral blocks in a semiconductor memory device and method of testing the same

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Double-row address decoding and selection circuitry for an electrically erasable and programmable non-volatile memory device with redundancy, particularly for flash EEPROM devices

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I claim: 1. A method of testing memory having a set of M memory locations, said method comprising ...

Standby current detecting circuit for use in a semiconductor memory device and method thereof

Therefore, it is an object of the present invention to provide a standby current detecting circuit ...

Process and device for checking substrate wafers

Since a defect counting process, particularly a counting process carried out by an operator, is ...

Synchro-to-digital converter

Accordingly, a primary object of the present invention is to provide a synchro-to-digital converter ...

Duty cycle control apparatus

What is claimed is: 1. Apparatus for controlling the duty cycle of an input signal having a period, ...

Signal level comparing circuit

It is accordingly an object of this invention to provide a signal level comparing circuit which can ...

Active receiving antenna

Details

Inventors: Biebl, Erwin; Luy, Johann-Friedrich;
Assignee: Daimler-Benz Aktiengesellschaft (Stuttgart, DE)
Primary Examiner: Wong; Don
Assistant Examiner: Ho; Tan
Attorney, Agent or Firm: Venable, Kunitz; Norman N.

An active receiving antenna for vehicles, including a slot-shaped antenna cut into the metallic vehicle body, and having small-depth cavity filled with a dielectric material which closes off the antenna toward the back or interior of the vehicle. A low-noise preamplifier, which is integrated into the dielectric material, is connected to the antenna via two feed lines of different length. The desired polarizations of the received signals are set via this preamplifier, which can be changed over and be switched off.

DETAILED DESCRIPTION It is the object of the present invention to provide a high-powered slot antenna arrangement with which different polarized waves are received and which can be easily adapted to a vehicle body.
The above object generally is achieved according to the present invention by a slot antenna arrangement which is used as receiving aerial for differently polarized waves and which is closed off from the rear by a cavity filled with a dielectric material, and wherein: the slot antenna is connected in-phase with a low-noise preamplifier via a pair of feed lines for coupling of the slot structure such that a specific phase position of the received waves is set via different lengths of the feed lines, and the preamplifier and the feed lines are placed or inserted in the cavity.
Advantageous embodiments and/or modifications of the basic invention are disclosed and discussed.
The slot antenna arrangement according to the invention has the advantage that excellent receiving results are accomplished by means of the integrated, low-noise preamplifier (LNA) which can be changed over and be switched off.
By means of the LNA, which can be changed over and be switched off, the antenna can receive waves which are polarized in a circular and linear manner.
Also advantageous are the flat, mechanically robust configuration of the antenna as well as its invisible and aerodynamically optimum arrangement in the vehicle body.
The invention is described below by way of an embodiment with reference to schematic drawings.

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