fig1 demonstrates in a simple drawing a preferred embodiment of a miniaturized antenna unit 1 for a mobile phone according to the present invention . the antenna unit 1 , for instance for an operating frequency around 900 mhz , contains a radiator element 10 consisting of a first helical coil and a reflector element 12 consisting of a second helical coil which will be slightly larger in total length to act as a reflector element . to maintain a small height of the entire antenna unit 1 the top portion 12a of the reflector element 12 is circularly curved towards the top of the radiator element such that the two elements 10 , 12 form an inverted u shape . this helps to keep the measure of mechanical height low without shortening the electrical length , but it also ties the charges at the top of the radiator to the charges at the top of the reflector . the total height of this inverted u shaped arrangement , for an operating frequency around 900 mhz , will then be of the order 35 mm . between the two elements 10 , 12 is placed a material 14 , for instance plastic containing ceramic powder . the mechanical spacing between the radiator and the reflector has to be shortened by the introduction of a dielectric material to obtain an electrical spacing of the order 0 . 1 λ to 0 . 15 λ between the two elements 10 , 12 at the operating frequency range . it is desired that this material inserted between the two elements 10 , 12 exhibits an effective dielectric constant of the order 20 to 90 , to practically be able to in some way match the antenna size for larger differences in wavelength used . the first helical coil is adapted to present a 1 / 2 λ at the operating frequency band and may in one particular embodiment present a top - load 11 having a slightly larger diameter of the coiling . the first coil constituting the radiator element 10 is electrically matched and connected to the center conductor 17 of a miniature male coaxial connector 15 , which will be inserted into a corresponding female coaxial connector , normally at the top of the mobile phone . however , it should be noted that the term &# 34 ; electrically connected &# 34 ; or just &# 34 ; connected &# 34 ; in this description refers to any galvanic , capacitive or inductive coupling , or any combination thereof . the second helical coil constituting the reflector arrangement may be electrically connected to the circumference of the male miniature coaxial connector 15 via a metal strip 20 . a first end of the strip 20 it is bent upwards at the position of the reflector element to connect to the helical coil of the reflector element 12 . consequently the reflector element 12 is thereby connected to connector screen . a further metal strip 21 below the strip 20 is also connected in the same way to the circumference of the male coaxial connector 15 and will be acting as an extra screening choke as this strip is not electrically connected to anything else but the ground portion of the coaxial connector 15 . in a particular embodiment a second end portion 22 at the opposite side of the strip 20 is also bent upwards along a small portion of the radiator element 10 to add an extra capacitive choke as a screening of the bottom of the helical coil constituting the radiator element . in an additional embodiment this portion 22 need not be the strip 20 itself but just a piece of electrically conducting wire connected to the strip 20 . the further metal strip 21 below the strip 20 electrically connected in the same way to the circumference of the male coaxial connector 15 will be acting as an extra screen as this strip is not electrically connected to anything else but the screen of the miniature coaxial connector 15 . thus this second l - bend or u - bend construction ( also see fig1 ) further reduces the coupling between the antenna radiator and the mobile phone . the entire arrangement is baked into a unit using a non - conducting material , e . g . rubber or the like . the small antenna unit will have a circular or semicircular shape as demonstrated in fig2 . in an preferred embodiment the antenna unit , for instance for a frequency in the 900 mhz range , will have a height of about 35 mm and a maximum width of about 15 mm and a minimum width of about 10 mm for a semicircular shape . there is also another embodiment available if a very short antenna is desired ( length ≈ 0 . 1 λ - 0 . 2 λ ). this embodiment involves a top and bottom loaded dipole with a reflector , miniaturized by using a thin helical shaped radiator and one or two likewise helical shaped reflectors in a similar manner as demonstrated by fig1 . the shortening of the distance between the radiator element , or elements , and the reflector is done in the same way as previously described by means of a corresponding dielectric material according to the already described embodiment along with fig1 according to the present invention . in a further embodiment the radiator element is a helical coil corresponding to the element 10 of the preferred embodiment of fig1 but the reflector element is made out of a metal strip which may be cut into a meander - like pattern to get the correct electrical length within the mechanically desired size . however , a better solution is to let the lower part of the strip instead make a 90 degree bend in under the antenna radiator for an end - feed dipole to its transformer and for a half - wave dipole and its transformer , whereby the bend of the reflector is electrically connected to the screen of the coaxial antenna connector corresponding to what was discussed regarding the elements 20 and 21 in fig1 . this l - bend construction of the reflector reduces the coupling between the antenna radiator and the mobile phone carrying the antenna . fig3 shows schematically a dipole antenna 10 in front of a metallic reflector strip 28 . most of the near - field related to the head - side of the antenna radiator is now enclosed in the space between the radiator and the reflector , but the current induced in the reflector strip will be concentrated to its parallel current edges and seen from the head - side of the antenna unit the currents are dependent of this and the result is a new near - field . however , this field may be eliminated by the twin - lead principle . this is achieved if according to fig4 a thin printed circuit board 30 comprising at least two thin isolated metallic strips 32 running parallel to the current edges of the reflector strip 28 and given the same length as the vertical part of the metallic reflector strip , is applied to the head - side of the reflector strip . the near - fields are now concentrated to the area in between the edge twin - leads . fig5 demonstrates a result using several such metallic strips on the printed circuit board carrying the metallic strip 28 . the thin metallic strips 32 on the board are electrically connected to the upper edge of the reflector strip , forming chokes on the back of the reflector . something must additionally be done to the concentration of charges at the top and bottom of the half - wave dipole . at the top it is recommended to apply some sort of top - load , and the same type of load can be applied also at the bottom for an end - fed dipole . this is applicable to fig1 where such a coil 11 will collect the field flux from the upper part of the radiator , and beneath this coil the two parallel u shaped , dielectrically loaded metallic strips are connected , which form a miniaturized integrated ground plane , for example , including two chokes . consequently in the solution in accordance with the principle of the present invention most of the near - fields in a direction towards a user will be concentrated in the dielectric area between the reflector and the radiator by the further action of the chokes thereby additionally improving the efficiency of the antenna in a desired direction towards a cellular base . at the same time an antenna unit is obtained , which is permanently operative without any further handling actions by a user .