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Multiple-antenna system

An antenna system and antenna technology, applied in the field of multi-antenna systems, can solve problems such as difficult antenna diagnosis

Active Publication Date: 2014-02-12
HARMAN BECKER AUTOMOTIVE SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when using a single feeder, antenna diagnostics are difficult, if eventually possible, to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] exist figure 1 , the illustrated exemplary improved multi-band multi-antenna system includes a rear end 1 and a front end 2 connected via a feeder 3 (eg coaxial cable).

[0014] Exemplary rear end 1 is shown in figure 2 . The backend 1 comprises a splitter network which may have capacitors 4 and inductors 5 . By means of the capacitor 4 the useful antenna signal is separated from the DC voltage or current provided by the back end 1 to the front end 2 via the inductor 5 . In this embodiment, the constant reference voltage U is provided by the reference voltage source 6 R , and the current measurement circuit 7 measures the DC current I taken from the reference voltage source 6 by the front end portion 2 M . Measured DC current I M Evaluated by the current evaluation circuit 8, which determines one of the various states of the front end 2 when in test mode. Each state corresponds to a certain internal resistance R of the front end 2 present on the feeder 3 i . C...

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PUM

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Abstract

An antenna system is disclosed herein which comprises a frontend portion, a backend portion and a feed line which connects frontend portion and backend portion with each other. The frontend portion comprises at least two antennas, a combiner circuit connected downstream of the antennas and upstream of the feed line and antenna connectors that electrically connect through antenna plugs the antennas to the combiner. The backend portion comprises an electrical power source connected to the feed line and a resistance evaluation circuit that is connected between the power voltage source and the feed line and that measures the resistance of the frontend portion through the feed line. At least one of the antenna connectors is in mechanical contact with a jumper having jumper plugs between which a high resistance connection and a low resistance connection is provided dependent on whether the corresponding antenna is connected to the combiner or not. The jumper plugs are connected to the feed line such that the total resistance of the frontend portion depends on whether the corresponding antenna is connected to the combiner or not. The resistance evaluation circuit is configured to detect if the antenna is not connected to the antenna signal amplifier by evaluating the resistance of the frontend portion.

Description

technical field [0001] This paper discloses a radio frequency antenna system, especially a multi-antenna system capable of working in multiple frequency ranges. Background technique [0002] An antenna is usually connected to a transmitter or receiver by means of a feeder. Antennas for radio frequency are effective over a limited frequency range. When operation over a wide frequency range is required, multiple antennas are typically used, each optimized for a specific narrow frequency band. The desired antenna is manually selected with a switch or other device that connects the feed line of that antenna to the transmitter or receiver. [0003] The antenna amplifier can easily be powered if the antenna is a so-called active antenna, ie includes an antenna (pre)amplifier. Furthermore, antenna diagnostics can be easily performed for each individual antenna. However, in such an antenna system a separate feed line must be provided for each antenna, which makes such a system c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04
CPCH04B1/0064H04B1/0466H04B17/0022H01Q5/0093H04B17/17G01R27/08H01Q1/46H01Q21/00H01Q5/15
Inventor K-A.贝克尔A.拉特泽尔
Owner HARMAN BECKER AUTOMOTIVE SYST