GB2319896A - Aerial arrangement with means of reducing unwanted signals - Google Patents

Abstract

An aerial arrangement comprises two arrays in which each array comprises parallel rod elements 1 formed on one surface of an insulating substrate. Conductors 2, 8, perpendicular to the said elements 1, are formed on the other side of the substrate and are arranged to connect the rod elements 1 to earth and to a signal transmission arrangement 9. A constant magnetic field, independent of the magnetic field present in the vicinity of the aerial, is produced by the interaction between an aluminium sheet 6 and two copper coils 7, present in a module 3. The module 3 is sandwiched between the arrays such that the rod elements 1 face outward. The aerial arrangement may be in the form of a flat planar array or a spherical array. The parallel rod elements 1 and module 3 are interconnected to an output terminal 10 in a manner such that unwanted signals are filtered out. The aerial arrangement may be applied to any FM or AM receiver which is subject to scattered or faded signals.

Description

NON-ELECTRI-4L RECEIVINJ AERIAL USING TW" MAGNETIC FIELDS' S DIFFERENCIAL AND TIME DIFFERENCIAL This invention concerns all types of receiving arials for domestic radio sets or professional ones,using frequency modulation.

Radio waves are regular disturbances of the magnetic field,under some frequency,and are liable to be scattered or weakened by the environment (buildinds,hills,weather.,.),and by the mere distance from the emitting point.Waves can also be partly or entirely faded by oppositite signals on the same wave length.

The position of the receiving set,on a choosen frequency,cannot help the reception by its arial of surrounding disturbances accoun -ting for the state of the magnetic field at that location.

Telescopic and directional arials,given the technics acknowled -ged todayn R able to develope an area that can be conceived of as a net which catches the wanted signal and those on the same frequency,in correspondance to its scope and orientation.

Resorting to electronics is necessary to amplify and clear the wanted signal,since the classical arial does not contribute in streaming the signal from the disturbances.

A conventional arial,whether teMscopic or directional,does not provide with a filter to distinguish amongst wanted and unwanted signals.

Moreover,while creating an area,or net,this sort of arials can only capt any signal according to the electromagnetic difference existing between the top and bottom part of the arial itself;how- -ever,that is making it necessary that a flux variation amplitude gears with the bracket of eXctromagnetic potential differencial of the receiving arial.

Then again,the flux variation near the arial creates a new poten -tial difference between top and bottom parts of the arial,and generates the new conditions for another bracket.

The incidence of the flux in the receiving process is then con -ditioned ,amongst other eeasons,by the diverse variations of the field and by the interactions between the arial and its en -vironment,the latter also depending on a condition that time has sufficiently elapsed so that a new potential difference has settled on the arial.

Consequently,a conventional arial is submitted to a function with time,and to an initial amplitude which make it relatively inadequate to convoy the whole of the real variations of the mag -netic field,these latter being independant from any factor in regards for the actual concept of the arial.

In summary,a conventional arial does not provide with any filtering between wanted signals and unwanted disturbances, and its perfor -mances in receiving are liable to a function with time and to the question of its anterior amplitude.

These 3 points are absent from the new concept which I display hereby.

she purpose of this invention is to rebance > the proportion of flux variations which make up the signal,in a rapport to the disturbances,in a fictive manner,owing to the connection inseries of the capting rods and also to the use of a counter fiC ,iso -lated from the exterior field ,and produced by the "parameter amplifier module1,1 thence releasing the reading of a signal from the electromagnetic bracket of each capting rod,setting the re -ception on a ground whichisthen independant from the functions with time or anteriority of amplitude that have been displayed.

This invention allows the reading of a signal on a more conti -nus lapse of time.

In summary, this invention presents two new qualities: -The new balance of"useful flux" operating as a filter which reduces the part of disturbances.

-The reading of the exterior field's variations through a con -frontation to another field,made independant from the nature and concept of the capting rod and from the state of the surroun -ding magnetic filed,allowing a reading through a constant counterfield,as a reading parameter.

The drawing shows the 2 panes(making up the whole of the object as seen after assembling,both giving the measures of its surface and width,but it also shows the parameter amplifier module)and its attending connections.

The 2 panes (4) are set face to face,the capting rods (1) showing towards outside.The parameter amplifier module (3) is inserted between the 2 panes (4).

The capting rods (1) are well shown on the facial view (A) and the conveying wires (2) on the back view.(B).

The connection of the 2 panes (4) to the parametrer amplifier module (3) appears on the shema;the whole is contained in the ob -ject made up by the 2 panes (4).

The coil (7) on the parameter amplifier module (3) is directed towards the centre of the object after assembly.

The material infrastructure of the panes (4) is an insulator which is deprived of any electrostatic quality(resined plastic,hardened c ardboard.

Each pane bears the capting rods (l),which are made of copper,on its exterior side (A),the capting rods (1) being connected to the conveying wires (2(,which are set up on the opposite side of the pane (B),perpendicularly to the set of the capting rods (1).

The connection is made possible through an orifice inside the pane (4),each of them at an end of the different capting rods(l).

The setting of the capting rods(1) into parallels to one another; and their connection in series,allow for their functionning each as an independant arial,with it that a scattered or weakened signal will not be overflown by the electromagnetic variations owing,first of all,to the short length of each rod,aiming at the seizing of these variations on a shorter length in real terms,and also to the repeating of this signal by each capting rod,at re -gular time intervals.

The conveying wires (2)as they are shielded from the exterior field by the insulator of the pane (4),do transmitt the pulse received by each of the capting rods (1) to which they are con -nected,as soon as the capting rods (1) undergo a variation of their electromagnetic potential differently from a moment when the potential 's difference has to suffice the amplitude of the field variation.

From the caracteristics of a radio wave,propagating a t a certain speed,the lapse of time between the instants when a same field varia -tion is received by two different capting rods (1) ,and because

o the connection of the capting rods (1) in series to the con -veying wires,the potential 's difference on the conveying wire is thinly linked to the propagation speed of the radio wave while each conveying wire reproduces and repeats the potential's difference which is imputed to the parameter amplifier module (3) through its input terminal,this all occuring at intervals which are dictated by the radio wave speed.

The "quantity" of useful signal is multiplied and its reading is carried out all along during a lapse of time which is made longer, Note:The capting rods(l)are,besides,connected in series to a con -veying wire to the ground,not encountering any further develope ments here.

The folding part makecus appreciate the filtering effect of such connections.

There is a frequency going with a radio signal whereas disturban -ces can be on a same wave length but do not have pre-set fre -quencies.If,at t time,they are reproduced by each capting rod (1) as much as the radio signal,at t time,giving the startof a ew period for the signal,the disturiance may may be neal then aswell.

Setting up the premice of the disturbances being caracterised by the temporarity of their signal,opFsed to the radio signal having a given frequency,it is possible to write that: l-Between to and tl,duration of a radio signal period,this signal and its consequent magnetic variations during one period are multiplied by the number of "n" capting rods (1).Thence,the time that is allowed for the receiver to read each signal is thereby increased in its duration.Let 's call this period of time the period of "continuity of the signal,equal to Fn/t -t in a rapport to the second,t being given in seconds and F in hertz.

2-In a same rapport to the second,the whole of variations generated by the disturbances happens during a time "x" ,and the "part"of disturbances is then expressed through the quotient x/(t1-t0)Fn.

It appears then that the quotient of continuity by part of distur -bances is equal to F2n/x,showing the by that the part of use -ful signal exists in a proportion to the square of the number n relating to the capting rods (l),and reversely proportioned to the duration of the variations which are generated by the distur -b ances ,all this at a given frequency.

This filtering effect is provided by the technical multiplication og the magnetic field variations in regards for the connection of tte capting rods in series.(l).

The parameter amplifier module (3) is made of an aluminium sheet (6),bearing two copper coils (7),made independant and isolated from one another.The parameter amplifier module (3) is connected to the main conveying wire (9) through the aluminium sheet (6), and to the receiving set through the coils (7) ' out put termi -nals,which are connected into a single wire (10).

The coils (7) are disposed on the sheet (6) and apply following its shape,so the copper wire of the coils is always applying the aluminium.The interrelated reactions of Aluminium and Copper atoms which are sustained by the electronic scaled current circulating between the receiver and the ground and in this direction,allows a powerful field to exist,and which is kept isolated from the exterior field surrending the arial.

So that the exterior field variations are confronted to the cons -tantly operating field which is generated by the parameter ampli -fier (3),the confrontation taking place at the stage of the con -veying wires (2),the so-named constantly operating field appea -ring now as a counter-field contrasting the electromagnetic va -riations coming from the exterior field.

The resulting field varying around the value of that constantly operating field,grounds this latter's name as parameter field for the receiver.

So,the electromagnetic potential difference on each capting rod(l) is transcripted in terms of an oscilliating value about the nomi -nal value of the constarti y operating field, This could also be written as:The electromagnetic difference in potential which is resulting from the confrontation of 2 fields (exterior and constantly operating),if 1 is the nominal value given to the constantly operating field,belongs to the bracket [l-x;l+x];x = unknown.

In consequence,whichever are the amplitudes of the exterior field 's variations,,for each of them,a relevant bracket exists which is independant from the concept of the capting rod (1),of the quali -ty of its interactions with the electromagnetic exterior field,a and of the time lapse imposed to the rebalancing of a potential difference on the capting rod (1) coming as a result.

To conclude,this. arial allows the reading of each variation constantly,in using a constantly operating field,set as a referen -cial field for the reading.

Then,this arial make it for a gain in intensity of the signal.

Owing to the specific connection of the capting rods(l) and to the use of the parameter module (3),this non-electrical arial regulates a timing differencial and an electromagnetic differen -cial,and associates both the assets of a gain in intensity of the signal aswell as the qualities of a filter for the disturban -ces.

This creation avails itself being efficient in receiving distant signals or faded ones,and can be fitted to any receiver,the t wo facing panes will be possibly oval in sha,giving to this arial the qualities of an omnidirectional one.

The different connecting sockets and plugs can be choosen to equip hi-fi,mobile radios etc.

Eventually,the overall format can be modelled to be possibly inserted in the casing of a set,or in the bodywork of a car.

In a loundge or in a kitchen,this arial can be possibly set on a foot,or else integrate a hook to hang on a wtull,or adhesive tapes used for stiking on a wall or a piece of furniture,at a convenient place.

The 2 versions,in a plane or a sphere,allow its use as an outdoor arial system.

Claims (1)

1. CiAIMS

   -i-Non-electrical aerial using two magnetic fields'differencial a and time differencial,convenient to all types of frequency and amplitude modulation receiver, It is composed of: -Two insulating panes (4),each of them on their exterior sides (A) bearing the copper capting rods (l),set into parallels,and on their exinterior sides (B),the copper conveying wires (2),disposed of in a perpendicular fashion to the ranks of capting rods.

   -One parameter amplifier module (3),made up with an aluminium sheet (6) and two copper coils applying to,which is connected in line between the conveying wires junction(9) and the receiver.

   This aerial is caracterised by: -The insertion between the 2 insulating panes (4 ) of the parame -ter amplifier module (3) -The setting of the capting rods (1) into parallels and of the conveying wires (2) into a perpendicular fashion to the sets of capting rods (1).

   -The connection of the capting rods (1) to the conveying res (2) and to earth (5),according to a connection in series of the capting rods (1) to the conveying wires (2),the latter (2) being set on the interior sid)of the insulating panes (B) (4),the capting rods (1) being set on the exterior side (A).

   2-In respect for claim 1,this aerial cnan be made of two demi -spher shaped panes (4) so as to make up just one sphere after assembly.

   3-In respect for claims 1 and 2,this aerial can be made of two panes (4) incorporating adhesive devices to adhere,or a hook to hang,or rest upon a fact.

   4-In respect for claims 1 and 2,this aerial can be made op two panes in a format which meets the requirements for their insertion in the casing of a receiver or into a bodywork or anu other struc -ture.