RU2716856C1 - Automotive antenna-shutter - Google Patents

Abstract

FIELD: antenna equipment.

SUBSTANCE: invention relates to the antenna equipment. Automotive antenna-shutter consisting of two arms, first of which is fan-shaped structure 1 of thin metal conductors woven into sun screen fabric mesh 2 of a typical automotive shutter, and the second arm is formed based on the metal weighting bar 3, simultaneously serving as the lower base of the shutter. Narrow end 4 of the fan of the first arm of antenna 1 is connected to central cable 5, and the central part of the second arm of antenna 3 is connected to the shielding braid of the given cable. At the antenna output, cable 5 passes through the electromagnetic compatibility filter (EMC filter) 6 and then is connected to the high frequency device (radio station) by means of high-frequency connector 7.

EFFECT: this technical solution provides concealment of antenna-shutter, symmetrical total pattern of antenna in a wide frequency range with low losses; antenna is protected against external climatic factors, easy to install and configure.

1 cl, 5 dwg

Description

This technical solution relates to antenna technology, namely to car antennas, and can be used in stealth anti-theft alarm systems.

A known antenna device for installation on glass (car) and, to be placed in the glass, a high-frequency "mass field" made in the form of a grid field of metal wires laminated to glass (patent for invention RU 2546608, IPC H01Q 1/00, H01Q 1 / 32. Antenna device / author-HAIZE Berid (DE); patent holder-DR. ING. H.C.F. PORSCHE AKTSIENGESELLSHAFT (DE). No. 2013153083/08; declared. 28.11.2013; publ. 10.04.2015. Bull . No. 10).

The basis of this invention is a device and method for manufacturing a high-frequency "mass field" of the antenna, which, as described, is located in the rear window of the car, has a minimum size and is able to work as an SDARS antenna only in a narrow frequency range from 2320 to 2332.5 MHz.

In addition, despite the minimum size, this “mass field” on the rear window of the car is clearly visible and attackers, if necessary, can easily detect it and neutralize it with the antenna.

A known antenna for terrestrial digital multimedia broadcasting (antenna of a mobile communication terminal device) for a mobile communication terminal containing such an antenna (patent RU 2331146, IPC H01Q 9/46. Antenna for terrestrial digital multimedia broadcasting and a mobile communication terminal containing such an antenna / authors: Mamrukov A.V. (RU), Beloded V.I. (RU), Bolikhov O.L. (RU) and others; patentee: ELGI ELECTRONICS INC. (KR). - No. 2005141108/09; 12/28/2005; published on 08/10/2008. Bull. 22).

This antenna includes a feeder line, an emitter containing a number of emitting components forming a fan-shaped shape in the working position of the antenna.

The disadvantages of this technical solution are the design complexity and rigidity of the antenna, eliminating the possibility of hidden installation of the antenna in the car.

Closest to the claimed technical solution is the layout of the antenna for a car window, made in the form of a plurality of antenna conductors having electrical connection with a high-frequency device located on a dielectric panel (car window) (patent for invention RU 2312433, IPC H01Q 1/32. car window antennas / authors: WALTON Eric K. (US), KHORIKI Yasutaka (US), ROSIN Martino (IT); patent holders: ZE OGAYO STATE UNIVERSITY RICECH FOUNDATION (US), KALEARO ANTENNA S.P.A. (IT) - No. 2004134340/09; claimed 22.04.2003; opu Bl 10.12.2007. Bull. 34).

This device is selected for the prototype.

The disadvantages of this antenna are:

- the antenna configuration is limited by existing heating conductors in the glass, which does not allow to optimize the size and orientation of the antenna conductors according to the requirements of electrodynamics;

- the configuration and geometric dimensions of the glass heater depend on the type of vehicle, which requires an individual determination of the configuration and dimensions of the additional antenna conductors;

- the placement of the printed conductors of the antenna on the rear window of the car involves interference in its design;

- antenna conductors must cross each power conductor at an angle of about 90 degrees to limit the interference caused by the power flow of the heater grid;

- antenna conductors cross adjacent power lines of the heater at points of different potential, which can lead to the flow through the inclined antenna conductors of direct current;

- The antenna conductors are clearly visible on the rear window of the car, which unmasks the antenna.

The aim of the present invention is to remedy these disadvantages.

This goal is achieved by the fact that in a car antenna-curtain, containing many antenna conductors located on the dielectric panel, and having electrical connection with a high-frequency device, the dielectric panel is made in the form of a sunshade, in which the antenna conductors of the first shoulder are a fan-shaped structure , and as the second arm of the antenna, a horizontal metal bar-weighting plate of the sun blind is used.

The proposed technical solution has novelty, inventive step and industrial applicability, i.e. all the criteria of the invention.

The novelty and inventive step is confirmed by patent research, and industrial applicability is due to the fact that for the implementation of the antenna it is enough to use any commercially available automotive sunblind, for example, such as Dollex SD778 or Altabede AL7030.

The invention is illustrated in the drawings (Fig. 1 - Fig. 5), where in Fig. 1 is a structural diagram of a curtain antenna; FIG. 2 shows a general view of the assembled antenna shutter; FIG. 3 shows a variant of the location of the curtain antenna in the passenger compartment, FIG. 4 is a distribution diagram of the relative radiation power of the curtain antenna; FIG. Figure 5 shows a graph of the dependence of the standing wave coefficient (SWR) on the radiation frequency.

The car antenna-curtain (Fig. 1, Fig. 2) consists of two shoulders, the first of which is a flat fan (pos. 1, Fig. 1) of thin metal conductors woven into the sun-screen fabric (pos. 2, Fig. 1 and Fig. 2) of a typical automobile curtain, and the second shoulder is formed on the basis of a metal strap-weighting (pos. 3, Fig. 1 and Fig. 2), which simultaneously performs the function of the lower base of the shutter. The narrow end (pos. 4, Fig. 1) of the fan-shaped cone of the first antenna arm (pos. 1, Fig. 1) is connected to the central core cable (pos. 5, Fig. 1), and the central part of the second antenna arm (pos. 3 , Fig. 1 and Fig. 2) is connected to the shielding braid of this cable. At the antenna output, the cable (pos. 5, Fig. 1) passes through an electromagnetic compatibility filter (ESM filter) (pos. 6, Fig. 1 and Fig. 2), which is the inductance on the ferrite ring, eliminating the influence of subsequent circuits on the parameters antenna shutters, and then connected to a high-frequency device (radio station) through a high-frequency connector (pos. 7, Fig. 1 and Fig. 2).

The shutter antenna shown in FIG. 1, according to its technical parameters, corresponds to the class of conical antennas, the characteristic features of which are a wide frequency range with high efficiency (Rothammel K., Krishke A. Antennas. Volume 2 (11th edition) .: Translated from German - M: DMK Press. 2007).

The optimal location of the curtain antenna in the passenger compartment is the area of the rear window of the car (Fig. 3), which provides it with a natural look and stealth for external observers.

In FIG. 4 shows a diagram of the distribution of the relative radiation power of the curtain antenna at a given location in the vehicle. All measurements were carried out in an open area free of buildings and cars within a radius of 100 m from a test car with a measured antenna. The distribution of radiated power was measured in the horizontal plane in the range of angles from 0 to 360 ° in increments of 30 °. The diagram of radiated power depending on the angle of rotation of the car with the measured antenna is built in orthogonal coordinates. An angle of 0 ° corresponds to the orientation of the vehicle axis on the measuring antenna. The radiated power in FIG. 4 is shown in relative logarithmic units (dB). The maximum radiation is observed along the axis of the car hood-trunk when the car is oriented by the trunk to the measuring antenna. The amount of radiated power in the direction perpendicular to the axis of the car is less than the maximum power, which is explained by the shielding effect of the wide rear pillar of the car. The ellipticity coefficient of the diagram (Fig. 4), defined as the ratio of the maximum attenuation (minus 32 dB) to the minimum (minus 22 dB), is 10 dB, which is acceptable for work in urban conditions with multipath propagation of radio waves.

As practice has shown, the configuration of the radiation zones of the curtain antenna is resistant to the design of the antenna and the type of vehicle.

In FIG. Figure 5 shows a graph of the standing wave coefficient (SWR) of the curtain antenna versus the radiation frequency. As follows from the graph, in the most heavily used frequency range for land mobile radio communications of 146-174 MHz, the SWR of the curtain antenna is no more than 2.5.

Tuning of the curtain antenna to the operating frequency of the radio station is carried out by changing the length of the conductors of the fan-shaped cone of the antenna (pos. 1, Fig. 1) according to the criterion of the minimum SWR.

The advantages of the proposed car antenna shutter are:

- broadband and low power loss;

- ensuring the secrecy of the antenna without changing the design of the car due to its disguise as a sun blind;

- use for mounting the antenna of the popular commercially available sun blinds;

- a symmetric total antenna pattern with an ellipticity factor of not more than 10 dB;

- protection of the antenna elements from external factors (moisture, dirt, etc.) and, as a result, the stability of the electrical characteristics of the antenna.

Claims (1)

Automobile antenna-curtain, containing many antenna conductors located on the dielectric panel and having electrical connection with a high-frequency device, characterized in that the dielectric panel is made in the form of a sunshade, in which the antenna conductors of the first arm are a fan-shaped structure, and as the second arm of the antenna uses a horizontal metal strap-weighting sunshade.

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