KR20070017383A - Modified Printed Dipole Antennas For Wireless Multi-Band Communication Systems - Google Patents

Abstract

The dipole antenna (FIG. 1) for the wireless communication device is separated from the second conductive element by the first insulating film 12 and includes a first conductive element 20 superimposed on a portion of the second conductive element. The first conductive via 40 connects the first and second conductive elements through the first insulating layer. The second conductive element is generally U-shaped. The second conductive element comprises a plurality of spaced apart conductive strips 34, 35, 36, 37 extending laterally from an adjacent end of the U-shaped leg 33. Each strip is sized to have a different center frequency of zero. The first conductive element can be replaced by a coaxial feed 60 towards the second conductive element. And extending from the leg sized to have a difference of λ 0 relative to another strip of the leg.

Description

Modified Printed Dipole Antennas for Wireless Multi-Band Communication Systems

TECHNICAL FIELD The present invention relates to antennas for wireless communication devices and systems, and more particularly to a printed dipole antenna for communication in a multi-band wireless communication system.

Wireless communication devices and systems are generally portable or included as part of a portable laptop computer. Therefore, the antenna must be very small in order to meet the proper device specifications. The system is used for general communication and likewise for wireless local area network (WLAN) systems. Dipole antennas have been used in such systems because they are small and can be tuned to the appropriate frequency. The printed dipoles are generally narrow rectangular strips, having a width of less than 0.05λ0 and an overall length of less than 0.5λ0. The theoretical gain of a λ / 2 dipole (see isotropic radiator) is typically 2.15 dBi, and the gain of a dipole athena (two-wire λ / 4 length, middle exited, isotropic copy) is 1.76 dBi. same.

The present invention includes a printed dipole antenna for a wireless communication device. And a first conductive element separated from the second conductive element by the first insulating film but superimposed on a portion thereof. The first conductive via connects the first and second conductive elements through the first insulating layer. The second conductive element is generally U-shaped. The second conductive element includes a plurality of spaced apart conductive strips. The conductive strip extends transversely from the adjacent ends of the U-shaped legs. Each strip on the leg is sized to have a different center frequency λ 0 than other strips on the same leg.

The first conductive element is L-shaped, and one of the L-shaped legs is superimposed on one of the U-shaped legs. The first conductive via connects the remaining L-shaped legs to the remaining U-shaped legs. Instead, the first conductive element can be connected to the end of the strip by individual vias.

The first and second conductive elements are each flat. Such strips may have a width of less than 0.05λ0 and a length of less than 0.5λ0.

The antenna is omnidirectional or directional. In the case of directivity, it comprises a ground plane conductor overlaid and separated from the second conductive element by the second insulating film. The third conductive element is overlaid and separated from the strip of the second conductive element by the first insulating film. A second conductive via connects the third conductive element to the ground conductor through the insulating film. The first and third conductive elements can be in the same plane. The third conductive element comprises a plurality of fingers nested on the side edge duvet of each strip.

1 is a perspective view showing an omni-directional, quad-band dipole antenna according to the present invention.

FIG. 2A is a plan view illustrating the dipole conductive film of FIG. 1.

FIG. 2B is a diagram showing a broadband modification example of the dipole conductive film of FIG. 2A.

3 is a plan view illustrating the antenna of FIG. 1.

4 is a coordinate diagram illustrating the antenna of FIG. 1.

5 is a graph showing the directional gain of two tuned frequencies.

6 is a graph showing the gain of frequency versus voltage standing wave ratio (VSWR) and S11.

FIG. 7A is a graph showing the effect of changing supply points or vias on the characteristics of the dipole antenna of FIG. 1, as shown in FIG. 7B.

FIG. 8 is a graph illustrating a slot S width change effect of the dipole of FIG. 1.

9 is a graph showing the effect on the 2-, 3-, and 4- strip dipoles of FIG.

10A is a graph showing the effect of changing the dipole width of FIG. 1, as shown in FIG. 10B.

11 is a perspective view illustrating a directional dipole antenna in accordance with the present invention.

FIG. 12 is a top view illustrating the antenna of FIG. 11.

FIG. 13 is a bottom view of the antenna of FIG. 11.

FIG. 14 is a graph showing the directional gain of the antenna shown in FIG. 11 for five frequencies.

FIG. 15 is a graph showing VSWR and S11 versus frequency of the antenna shown in FIG.

FIG. 16A is a graph showing the effect of changing a supply point or via at the feed position shown in FIG. 16B for the dipole antenna of FIG.

FIG. 17 is a graph illustrating a width change effect of the slot S for the dipole antenna of FIG. 11.

18A is a graph showing the effect of varying the width of the dipole (as shown in FIG. 18B) of the antenna shown in FIG. 11.

FIG. 19A is a graph showing the effect of varying the length of the directional dipole (as shown in FIG. 19B) of the antenna shown in FIG. 11.

20 is a plan view showing a dipole conductive film of another dipole antenna according to the present invention.

FIG. 21 is a graph showing the frequency versus VSWR and S11 of the antenna shown in FIG.

22 is a graph showing frequency vs. directivity for 4 theta of the antenna shown in FIG.

FIG. 23 is a graph showing the directional gain of the antenna shown in FIG. 20 for three frequencies.

24A, 24B, and 24C are plan views showing a dipole conductive film of still another dipole antenna modification according to the present invention.

25 is a graph of VSWR and S 11 versus frequency of the antenna shown in FIG. 24A.

FIG. 26 is a frequency versus directivity graph for 3 theta of the antenna shown in FIG. 24A.

FIG. 27 is a graph showing the directional gain of the antenna shown in FIG. 24A for three frequencies.

28A, 28B, 28C, and 28D are plan views showing a dipole conductive film of yet another dipole antenna modification with coaxial supply according to the present invention.

FIG. 29 is a graph showing VSWR and S11 versus frequency of the antenna shown in FIG. 28A.

30 is a frequency versus directivity graph for 1 theta of the antenna shown in FIG. 28A.

FIG. 31 is a graph showing the directional gain of the antenna shown in FIG. 28A for 3 theta.

Although the antenna system of the present invention describes a WLAN having dual frequency bands of about 2.4 GHz and about 5.2 GHz and a GSM / 3G multiband subwire communication device of about 0.824-0.960 GHz, 11.710-10990 GHz, and 1.885-2.200 GHz, The antenna of the present invention can be designed for operation in any frequency band of a portable wireless communication device. This includes the GPS (1.575 GHz) or Bluetooth designated (2.4-2.5 GHz) frequency range.

Antenna system 10 of FIGS. 1, 2A, and 2 includes an insulated substrate covered with films 14, 16. A first conductive film 20 (which is a micro stream line) is printed on the substrate 12 and a separate dipole conductive film 30 is printed on the opposite side. The first conductive film 20 is generally L-shaped with legs 22 and 24. The second conductive film 30 generally comprises a U-shaped strip balloon line portion 32 having a curved bite 31 and a pair of separate legs 33. A plurality of strips 35, 37, 34, 36, strips extend across and adjacent the ends of the legs 33. The legs 22 of the first conductive film 20 are superimposed on one leg 33 of the second conductive film 30 by another leg 24 extending across the pair of legs 33. . The conductive via 40 connects the end of the leg 24 to one leg 33 through the insulating substrate 12. The terminal 26 located at the other end of the first conductive film 20 receives a drive for the antenna 10.

The four strips 34, 36, 35, 37 are each set to have a unique size and are tuned to different frequency signals or received different frequency signals. Instead, each strip on each leg is tuned to a different frequency signal than the rest of the strips or strips on the same leg, or specified to be of a specific magnitude. They are sized to have a width of less than 0.05λ0 and an overall length of less than 0.5λ0.

FIG. 2B shows a modification of FIG. 2A. This variant includes six strips 35, 37, 39, 34, 36, 38, each extending from a point adjacent the end of the leg 33 of the second conductive film 30. This allows for tuning and reception of wideband frequencies. The strips of the two embodiments are generally parallel to each other.

The insulating substrate 12 is a printed circuit board or a flexible film substrate made of glass fiber or polyamide. Covers 14 and 16 are added to the insulating film or are hollow casing structures. Preferably, the conductive films 20 and 30 are printed on the insulating substrate 12.

As an example of the quadband dipole antenna of FIG. 1, the frequency falls within the range of 2.4-2.487, 5.15-5.25, 2.25-5.35 and 5.74-5.824 GHz, for example. For the directional diagram of FIG. 4, the directional gain for two frequencies is shown in FIG. 5. The two frequencies are 2.4 GHz (graph A) and 5.6 GHz (graph B). The maximum gain at 90 degrees is 5.45 dB at 2.4 GHz and 6.19 dB at 5.6 GHz. The sizes of VSWR and S11 are shown in FIG. VSWR is less than 2 in the 2.4 GHz and 5.6 GHz frequency bands. The band from 5.15-5.827 is integrated at the 5.6 GHz frequency.

The height h of the insulating substrate 12 changes depending on the permeability and dielectric constant composed of the film.

Narrow rectangular shapes of suitable size strips 34, 36, 35, 37 increase the overall gain by reducing the loss of surface waves and conductive films. Also, a plurality of conductive strips affects the frequency subbands.

The width of the slot S between the position of the via 40 and the legs of the U-shaped subconductor 32 affects the antenna performance with respect to the gain distribution in the frequency band. The width of the slot size S and the location of the vias 40 are chosen to have approximately the same gain in all frequency bands of the strips 34, 36, 35, 37. Theoretically the maximum gain obtained is more than 4dB, 5.7dB at 2.4GHz and 7.5dB at 5.4GHz.

FIG. 7A is a graph of the effects of various locations of feed point (fp) or via 40 and on VSWR and S11. The central feed point fp1 also corresponds to the result of 6. A change in the supply point fp has a small effect on the gain, but a great effect on shifting λ 0 in the second frequency band within the 5 GHz range.

8 shows the effect of changing the slot width from 1 mm to 3 mm or 5 mm. The 3mm slot width corresponds to FIG. 6. Not many changes occur in VSWR, but a substantial change in S11 size occurs. For example, for a 5mm strip, S11 is -21dB at 2.5GHz and -16dB at 5.3GHz. For a 3.3mm strip, S11 is -14dB at 2.5GHz and 125dB at 5.3GHz. For a 1mm strip, S11 is nearly equal to -13dB at 2.5GHz and 5.3GHz.

The change in length of the individual strips 34, 35, 36, 37 between 5 mm, 10 mm and 15 mm V corresponds to the 15 mm length. In addition, the change in length between strips 34, 35, 36, 37 varying between 1 mm, 2 mm and 4 mm has a very minor effect on the size of SWR and S11. An interval of 2 mm is reflected in FIG. 6. In the gap between 2mm and 4mm, the difference in size is about 2dB. 9 shows the response to 2-, 3- and 4-dipole strips.

10A and 10B show the effect of varying the width W of the dipole while maintaining the individual strip widths. The width W of the dipole varies from 6 mm to 8 mm to 10 mm. 6 mm width corresponds to FIG. 6. For the FIG. 6 mm width, there are two characteristic frequency bands. 2.4GHz band with an S11 size of -14dB and 5.3GHz with an S11 size of -25dB. For an 8mm width, there is one wide band that contains less than two VSWRs extending from 1.74 to 5.4 GHz and having an S11 size of about -20 dB. Likewise, the 10mm width is one wide band that exists in two or less VSWRs, extending from 1.65 to 5.16 GHz and having -11 dB S11 at 2.2 GHz and -11 dB S11 at 4.9 GHz.

A directional (or single-directional) dipole antenna according to the present invention is shown in FIGS. 10B1-10B3. Elements having the same structure, function and purpose as the omni-directional antenna of FIG. 1 are denoted by the same reference numerals.

In addition to the first conductive film 20 located on the first surface of the insulating substrate 12 and the second conductive dipole 30 located on the opposite surface of the insulating substrate 12, the antenna 11 of FIGS. 11 to 13. The ground insulating film 16 is separated from the second conductive film 30 by the lower insulating film 16. In addition, a third conductive element 50 is provided on the same surface of the insulating substrate 12 as the first conductive element 20. The third conductive element 50 is a directional dipole. It comprises a central strip 51 having a pair of end portions 53. This is generally a barbell shaped conductive element. This is superimposed on top of the strips 34, 36, 35, 37 of the second conductive film 30. It is connected to the ground film 60 by a via 42 extending through the insulating substrate 12 and the insulating film 16.

The directional dipole 50 includes a plurality of fingers that overlap on the ends of each strip 34, 36, 35, 37. As shown, the last strips 52, 58 overlap and extend horizontally beyond the horizontal edges of the strips 34, 36, 35, 37. The inner fingers 54, 56 are located adjacent to and not horizontally extending beyond the inner edges of the strips 34, 36, 35, 37.

Preferably, the permeability or dielectric constant of the insulating substrate 12 is greater than the permeability or dielectric constant of the insulating film 16. In addition, the height h1 of the insulating substrate 12 is substantially smaller than the height h2 of the insulating film 16. Preferably, the insulating substrate 12 has a thickness of at least half of the thickness of the insulating film 16.

The polygonal perimeter of the end portion 53 of the directional dipole 50 is similar to the shape of the PEAN03 fractal-shaped directional dipole. The profile of the antenna 12 has the appearance of a double planar inverted-F antenna (PIFA).

14 is a graph showing the directional gain of the antenna 12. On the other hand, Figure 15 is a graph of the sizes of VSWR and S11. Five frequencies are shown in FIG. 14. Maximum gain is greater than 7dB, 8.29dB at 2.5GHz and 10.5dB at 5.7GHz. The VSWR of FIG. 15 relates to two or more frequency bands of 2 or less.

16A and 16B show the effect of supply point fp or via 40. Supply point 0 is similar to that shown in FIG. 15. 17 shows the effect of slot width S on 1 mm, 3 mm, and 5 mm. The 3 mm width generally corresponds to FIG. 15. 18A and 18B show the effect of dipole strip width SW on widths of 6 mm, 8 mm, and 10 mm. 6 mm width corresponds to FIG. 15. 19A and 19B show the effect on the length SDL of the directional dipole 50 location 51 on the second frequency in the 5 GHz range. The 8 mm width generally corresponds to FIG. 15.

Similar to the antenna system 10 of FIGS. 1, 2A, 3, the antennas of FIGS. 20, 24 include l-shaped first conductive films 20, which first micro-strips. The dipole conductive film 30, which is a line, is printed on the opposite side of the substrate 12. The conductive via 40 connects the end of the leg 24 to one of the legs 33 of the insulating substrate 12. The terminal 26 located in the remaining leg 22 of the first conductive film 20 receives a drive for the antenna 10.

The strips 34, 36, 35, 37 on the legs 33 of the dipole conductive film 30 separated in FIG. 20 are trapezoidal in shape. Adjacent sides 34/36, 35/37 of the strip are shown in parallel. Strips 34 and 35 are shown to be shorter in length than strips 36 and 37. The width W is 22 mm, for example, and the length L is 48-68 mm.

As an example, the dual band dipole antenna of FIG. 20 has a width W of 22 mm and a length L of 48 mm. The magnitudes of VSWR and S11 are shown in FIG. 21. VSWR is less than 2 between 0.7 GHz and 2.5 GHz. Directivity at zero pie and four different thetas is shown in FIG. 22. Directional gain is shown in FIG. 23 for three frequencies and theta and zero degree phi. That is, Fig. 23 shows a 0.9 GHz frequency (graph A) with a maximum gain of 5.17 dB for the 12 degree theta, 1.85 GHz frequency (graph B) with a maximum gain of 5.93 dB for the 7 degree theta, and a 5 degree theta. The 2.05 GHz frequency (graph C) with a maximum gain of 6.16 dB is shown.

24A, B, and C show a modification of the dual band dipole antenna structure. The structures of streams 34 and 35 are the same, and the strips 36 and 37 are also the same. By way of example, strip 34 includes a first portion 34A that extends laterally from U-shaped leg 33 and has a second end 34B that extends laterally toward first portion 34A. Include. One side of the first portion 34A is horizontal with respect to the axis of the leg 33, while the other side extends inwardly at an oblique angle and has the same slope as the second position 34B. The strip 35 has the same structure as previously described. As an example, the leg 37 is generally T-shaped and extends from one side of the base portion 37A, the head portion 37B, and the head portion of the T-shaped back side toward the U-shaped leg 33 ( 37C). This coupling structure is generally seen in the form of a presser foot claw hammer. The portion 37C is located on the opposite side of the body 37A from the strip 35. The angle of position 34B causes the strips 34 and 35 to have the same length as the strips 36 and 37. The strips 34, 35 generally extend at right angles from the U-shaped legs 33. This structure gives the desired frequency response and at the same time minimizes the width (W). The length L of the separating dipole is in the range 35-42 mm and the width W is in the range 10-24 mm.

A modification of the antenna shown in FIG. 24A is shown in FIG. 24B. Strips 36 and 37 are generally T-shaped and include portions 37A, 37B and 37C. A variant of the strips 34 and 35 is shown. The strip 34 includes a straight portion 34A that extends across the leg 33 and includes a head portion 34C that forms an inverted L-shape. The length of the strip 34 is shorter than the length of the strip 36. Short legs 34C of the strip 34 and corresponding portions of the strip 35 extend through the insulating substrate 12 including the vias 44. Likewise, portions 37B and 37C of strip 37 and corresponding portions of strip 36 include vias 46 that extend through insulating substrate 12. The design objectives of the antennas of FIGS. 20, 24A, 24B and 24C are for TV and GSM low bands to maintain or reduce the overall antenna size by extending or overlapping in the Z direction (elements 44 and 46 in FIGS. It is to extend the frequency band to (400-800MHz).

FIG. 24C shows a further variant of the dipole antenna of FIG. 24B. The base portion 37A of the strip 37 and the corresponding portion of the strip 36 are shown in a serpentine pattern. Compared with the sinusoidal or triangular serpentine pattern of FIG. 28B described below, the serpentine pattern of FIG. 24C is a square serpentine pattern.

As an example, the dual band dipole antenna of FIG. 24A has a length W of 22 mm width W rkh 40 mm. The sizes of VSWR and S11 are shown in FIG. VSWR is less than or equal to between 0.7 and 1.2 GHz and 1.6 and 2.5 GHz. Directivity at zero pi and three theta is shown in FIG. 26. The three theta are 0 degrees (Graph A), 12 degrees (Graph B), and 10 degrees (Graph C). Directional gain is shown in FIG. 27 for three frequencies and theta, and a zero degree phi. That is, it has a maximum gain of 5.15 dB for 0 degree theta at 0.9 GHz (graph A), a maximum gain of 5.83 dB for 12 degree theta at 1.85 GHz (graph B), and 5.97 dB for 10 degree theta at 2.05 GHz. Has the maximum gain of.

A printed dipole antenna powered by a coaxial cable is shown in FIGS. 28A-D. The construction of 28A generally corresponds to that of FIG. 24C, but excludes coaxial cable supply. The coaxial feed 60 is connected to a line 62 connected to one of the legs 33 comprising strips 34 and 36 and a second line connected to a U-shaped portion 33 comprising strips 35 and 37. 64). The length L of the separating dipole structure is in the range of 35-44 mm and the width W is in the range of 10-25 mm. Since this is a coaxial supply, the first conductive film 20 does not exist, and only the second conductive film 30 exists.

28B and 28C show an antenna structure for coaxial supply corresponding to FIGS. 24B and 24C. One of the deformation parts is a uniform width, in which the base part 37A of the strip 37 and the corresponding part of the strip 36 extend into the trapezoidal part 37D and the head part 37B, which are connected to the legs 33. It includes one portion 37E. As mentioned previously, the serpentine pattern 37A and the corresponding portions of the strip 36 are shown in FIG. 28C. This serpentine pattern is bent to form a sine wave, triangle or sawtooth wave.

The antennas of FIGS. 28B and 28D include conductive plates 72 and 74. The conductive plates 72 and 74 are portions that are placed next to each of the strips 34/36 and 35/37 and are separated from each other by an insulating substrate 12 (not shown). The conductive plates 72 and 74 are located on opposite sides of the insulating substrate 12 in place of the first conductive film 20. Since this is a coaxial supply, the first conductive film 20 does not exist. The position of the plates 72, 74 along the length of the individual strips 34/36 and 35/37 controls the response of the dipole antenna. Note that the conductive vias 44, 46 do not contact the conductive plates 72, 74 extending through the insulating substrate 12.

Conductive plates 72 and 74 are available for all antennas described herein. These may be adhesive metal bands or strips attached at different fixing positions. The designed frequency band can be varied as a function of the location of the conductive patch, in the range of about +/- 500 MHz. During S11 or VSWR test measurements, the user can select this location. In addition, these plates 72 and 74 may be movable conductive (metal) strips that are moved by an antenna or a machine attached to the antenna box. In this case, play is a kind of mechanical adaptive antenna. Plates 72 and 74 are arranged on one side with dipole strips 34/36 and 35/37 or on opposite sides, and the difference between these positions is within the percent change in frequency (position on the side containing the dipole). Is the largest).

By way of example, the dual band dipole antenna of FIG. 28A includes a width W of 25 mm and a length L of 40 mm. The sizes of VSWR and S11 are shown in FIG. VSWR is less than or equal to between 0.85 and 1.1 GHZ and between 1.6 and 2.5 GHz. Directivity at zero degree pi and zero degree theta is shown in FIG. Topographic gain is shown in FIG. 31 for three frequencies, 0 degree theta and pi. That is, it has a maximum gain of 5.13 dB at 0.9 GHz (graph A), a maximum gain of 7.43 dB at 1.85 GHz (graph B), and a maximum gain of -2.25 dB at 2.05 GHz (graph C).

Although not shown, a plurality of via holes around the dipole passing through the insulating film 12 are provided. These via holes provide quasi-light crystals. This improves the overall gain by reducing surface waves and radiation within the insulating material. This applies to both antennas.

The above-described embodiments of the present invention are for illustration and description only, and are not intended to limit the present invention to the described form. Accordingly, various changes and modifications can be made to those skilled in the art to which the present invention pertains. In addition, the detailed description of this specification does not limit the scope of the invention. The scope of the invention is defined by the appended claims.

Claims (30)

A first conductive element separated from the second conductive element by the first insulating film and superimposed on a portion of the second conductive element; And A first conductive via connecting the first and second conductive elements through the first insulating layer, The second conductive element is U-shaped, The second conductive element includes a plurality of spaced apart conductive strips extending laterally from the U-shaped adjacent leg end, and Wherein each strip extends from a leg sized to have a difference of λ 0 relative to another strip of the leg. The method of claim 1, The first conductive element is an L-shaped dipole antenna, characterized in that the. The method of claim 2, And one of the L-shaped legs overlaps one of the U-shaped legs. The method according to claim 2 or 3, And the first conductive via connects the other one of the L-shaped legs and the other one of the U-shaped legs. The method of claim 1, And the first and second conductive elements are flat, respectively. The method of claim 1, Wherein each strip has a width of less than 0.05 λ0 and a length of less than 0.5 λ0. The method of claim 1, A ground plane conductor separated from the second conductive element by a second insulating film and superimposed thereon; A third conductive element superimposed and separated from the strip of the second conductive element by a first insulating film; And A second conductive via connecting the third conductive element to the ground conductor through the insulating film A dipole antenna for a wireless communication device further comprising. The method of claim 7, wherein And said first and third conductive elements are coplanar. The method of claim 7, wherein And the third conductive element comprises a plurality of fingers superimposed on a portion of the side edge of each strip. The method of claim 7, wherein First and last strips and nested first and last fingers located on each of the U-shaped legs extend laterally beyond the lateral edges of the respective strips. The method of claim 7, wherein The permeability of the first insulating film is greater than the permeability of the second insulating film dipole antenna for wireless communication device. The method of claim 11, The thickness of the first insulating film is greater than the thickness of the second insulating film, the dipole antenna for a wireless communication device. The method of claim 1, Further includes a pair of conductive plates, Wherein each conductive plate is adjacent to the strip of the U-shaped leg at a selected point. The method of claim 13, And the conductive plate position is adjustable. The method of claim 1, And the first conductive film is a substrate, and the first and second conductive elements are elements printed on the substrate. The method of claim 1, And a plurality of said strips parallel to each other. The method of claim 1, At least one of the strips has a trapezoidal shape. The method of claim 1, At least one of the strips has a serpentine shape. The method of claim 18, The twisted shape is any one of a sinusoidal wave, a triangle, and a rectangle. The method of claim 1, At least one of the strips comprises a trapezoidal portion and a portion having a uniform width extending from the stepped portion. The method of claim 1, And at least one of said strips is in the form of a presser foot claw hammer. The method of claim 22, And at least one of said strips is T-shaped. The method of claim 22, And a strip perpendicular to the T-shaped strip and adjacent strips adjacent to the T-shaped head. The method of claim 22, And the strip adjacent to the T-shaped strip has a length shorter than the length of the T-shaped strip. The method of claim 24, And the strip adjacent to the T-shaped strip is inverted L-shaped. The method of claim 22, And a portion of the T-shaped strip extending from one side of the T-shaped rear head toward the U-shaped leg. The method of claim 1, At least one of the strips includes a first portion extending across the first end to the U-shaped leg, the second portion crossing the first portion at the second end of the first portion A dipole antenna for a wireless communication device, characterized in that. The method of claim 27, And said second portion extends through said first insulating film. The method of claim 27, And the second position is L-shaped. A wireless communication device comprising the antenna of claim 1.

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