TW574768B - Planar antenna utilizing two-layered broadside-coupled microstrips - Google Patents

Description

574768 V. Description of the invention (1) 1. [Technical field to which the invention belongs] The present invention relates to a plane-type sky and line using a double-layer wide-side stand, and particularly to the benefits, simplified configuration, and manufacturing process of the line structure. The simple planar type consumes more power and increases the number of antennas. [Previous technology] In recent years, due to the large appearance of commonly used reflective antennas, it has gradually become unsuitable for high precision and light weight. Therefore, higher-order leakage waves of transmission lines are used. Leaky wave) planar antennas have emerged as the times require. However, compared with conventional antennas, planar antennas that use the higher-order leakage wave characteristics of transmission lines perform worse in antenna gain or directivity. In the past decade, countermeasures to improve the antenna gain of planar leaky wave antennas have been widely studied and proposed. Fig. 1 is a schematic perspective view showing a conventional planar bubble leak wave antenna 10; Referring to FIG. 1, the conventional planar antenna) ¾ leaky wave antenna 10 mainly includes a dielectric strip 11 (dielectric strip) and is disposed on a Teflon sheet 12. With this configuration, the dielectric material strip line 丨 丨 weakly attenuates / produces the propagation energy due to the electromagnetic interference of a plurality of metal patches 1 3 (me tal patch) arranged around it, thereby realizing a high-gain planar leakage Wave antenna 10. Fig. 2 is a schematic perspective view showing another conventional planar leak wave antenna 20, which is disclosed in U.S. Patent No. 4,46 3,3 30. Referring to FIG. 2, the conventional planar leaky wave antenna 20 mainly includes a rectangular dielectric strip line 22.

Page 6 574768 V. Description of the invention (2) It is a non-radiative dielectric material guide (non-radiative dielectric guide). The rectangular dielectric strip line 22 generates a leakage wave with a very low attenuation rate by the etched trenches (not shown, shown) periodically arranged thereon. After the leakage wave propagates through the rectangular waveguide V21 (rectangular waveguide), it radiates through a set of slot antenna array 24, and forms a radiation chirp with a very high gain. As for antennas. Lift in combination with the antenna. In addition, combining) can improve the efficiency of leakage. Botianyi and Active Unit 2 〇 need to integrate by road in a complex process to achieve the real line, for example, when it can be reduced, the rate of application in millimeters and save the line 10 and 20 pieces integrated. Extra introduction. Therefore, if the adjustment is not tightly arranged, the application side also needs space when receiving less transmission. None of the results are flat. The surface circuit is easy to learn and saves the surface. The front end of a typical circuit loses 4 lbs., And the power is active at the same time. However, because the surface printing is familiar, the flat surface can be combined with the product's flat surface. The low-noise amplifier of the space project directly makes the sensitivity of the entire system (spat ia 1 power signal source and antenna combined, which is the conventional planar circuit board structure described above, so the non-planar leakage wave antenna 10 and the body Transmitting circuit or receiving electric leakage wave antennas 10 and 20 are not produced in large quantities, and there are none at the same time.

III. [Summary of the Invention] As mentioned above, the planar antenna of the broad-side light-strip microstrip line of the present invention can effectively reduce the energy attenuation rate by applying the double coupling effect. w 、, Power on and off The other purpose of the present invention is to provide a kind of double-layer wide-edge surface bonding.

574768

Planar antenna with line Another planar antenna with line is integrated with the circuit of the present invention. , Can achieve high antenna increase, the purpose is to provide a ’that can be easily and profitably. The application of a double-layer wide-side coupled microwave front-end band is to provide a thousand-plane antenna using a double-layer wide-side surface combined with a micro π line, which has a simple configuration and a simple manufacturing process. A further object of the present invention is to provide a planar antenna array, which is composed of a plurality of planar antennas using double-layer wide-side coupled microstrip lines arranged in parallel, which can reduce the complexity of the feeding circuit and reduce the transmission height. A pencil — beam of directivity. According to one aspect of the present invention, a gate antenna provides a planar antenna using a double-layer wide-side coupled micro π line, including an upper-layer feed circuit and a lower-layer feed circuit that are insulatively insulated from each other; and an upper layer. The wide-side wheeled microstrip line and the lower-layer wide-side coupled microstrip line are electrically insulated from each other and extend parallel to one side ^ The upper-layer wide-side coupled microstrip line is electrically connected to the upper-layer feed circuit and consists of 4 upper layers The lower-layer wide-side coupled microstrip line is electrically connected to the lower-layer feed circuit and is excited by the lower-layer feed circuit. In another aspect according to the present invention, a planar antenna array is provided, including an even number of planar antennas using a double-layer wide-side coupled microstrip line 2: 乂: f is arranged in parallel; M and-parallel feed The input circuit is composed of a plurality of descents, etc., and is used to excite the even number of planar antennas and wires using a double-layer wide-side coupled microstrip line. In the present invention, the first higher-order mode of the microstrip line that is expected to be excited is a propagation mode in which the current is antisymmetric. Specifically, 574768 V. Description of the invention (4) The currents on the two symmetrical parts of the microstrip line with the center line in the extending direction as the axis of symmetry have a phase difference of 180 degrees from each other. Similarly, the currents on the two symmetrical 4-knife blades with the center line in the extension direction as the axis of symmetry in the broad-side turned microstrip line in the lower layer also have a phase difference of 180 degrees from each other. Furthermore, the current on each part of the upper wide-side microstrip line and the current on the part corresponding to that part of the lower wide-side coupled microstrip line have a phase difference slightly greater than 180 degrees, For example, it is a phase difference of 96 degrees. Also, the current must be distributed non-equally to the upper-layer feed circuit and the lower-layer feed circuit, so that the total energy fed to the lower-side wide-side coupled microstrip line is greater than the total energy fed to the upper-side wide-side coupled microstrip line. 4. [Embodiment] 4. The following description and drawings will make the foregoing and other objects, features, and advantages of the present invention more apparent. Bismuth will / refer to the figure for a detailed description of a preferred embodiment according to the present invention. ^ 3 shows a partial explosion of the composite 2 wire 30 using a double-layer wide-edge coupled microstrip line according to the present invention ^. Referring to FIG. 3, a double-layer wide-side coupling to 3 ^ Γ, a first pull planar antenna 30 is included including first to third dielectric material plates 32: 1 material plate 'm, plate 31' for grounding and adhesion The first dielectric 1 input circuit 35 is opened, and the double-layer feed circuit structure 33 further includes the input circuit 36 to form 3 on the 1-dielectric material board 323, the upper-layer feed circuit 35, and a dielectric material. The board 3 23 is electrically connected to the input lower layer feed circuit 37, and a part of it is formed in the third medium

574768 V. Description of the invention (5) The electric material plate 3 23 is electrically connected to the input circuit 35 and the other part is sandwiched between the second and third dielectric material plates 3 22 and 323. The double-layer wide-side coupled microstrip line structure 34 includes an upper-layer wide-side coupled microstrip line 341 formed on the third dielectric material plate 32 3 and electrically connected to the upper-layer feed circuit 36, and a lower-layer wide-side coupled microstrip The line 342 is sandwiched between the second and third dielectric material plates 322 and 3 23 and is electrically connected to the lower feed circuit 37. The width of the upper wide-side coupled microstrip line 341 is slightly larger than the width of the lower wide-side coupled microstrip line 342. In addition, the upper wide side engaging microstrip line 341 and the lower wide side engaging microstrip line 342 are parallel to each other and their center lines A and a 'in the extending direction are aligned with each other up and down. Fig. 4 (a) is a top view showing a portion of the planar antenna 30 using the double-layer wide-side coupling microstrip line shown in Fig. 3 located on the third dielectric material plate 323. Fig. 4 (b) is a view showing FIG. 3 is a top view of a portion of a planar antenna 30 using a double-layer wide-side coupled microstrip line sandwiched between a second dielectric material plate 32 and a third dielectric material plate 32 3. In FIGS. 3 and 4 (1)), the dotted line is used to indicate that the portion shown in FIG. 4 (a) and the portion shown in FIG. 4 (a) are perpendicular to each other, that is, shown in FIG. Projection trace of the part shown. = ^ The input circuit 35 in FIG. 3 includes an input metal ^^ 351 ″ as an input terminal and can be connected to a microwave front-end circuit and an input / 4 resistance conversion section 3 5 2 to achieve one of impedance matching. The belonging line 3 5 3 is used as a divider and turns the circuit round > = and the value. Private Hahan's entry impedance is transformed into pure and complex one: Ϊ If Figure 4 (,) households *, Figure 3 above the 'feed circuit 36 includes the first genus, '61, the first-metal line 362, and Third metal wire 3 6 3. Brother-metal wire 361 is used to evenly distribute the input power to the second metal wire.

Page 10 574768 V. Description of the invention (6) and the second metal wire 363. The length of the third metal line 363 is designed to be longer than the length of the second metal line 3 6 2 by an odd multiple of / 2 or / 2, where λ is the wavelength of the current, so that the upper-side broad-side coupled microstrip line 3 In 41, the currents on the two symmetrical parts with the center line A in the extending direction as the axis of symmetry have a phase difference of 180 degrees from each other. Furthermore, as shown in FIGS. 4 (a) and 4 (b), the lower-layer feed circuit 37 in FIG. 3 includes a fourth metal line 371 having an upper portion 371A and a clip formed on the third dielectric material plate 323. A portion 371B, a fifth metal line 372, and a sixth metal line 373 between the second and third dielectric material plates 322 and 323. The upper portion 371A and the lower portion 371B of the fourth metal line 371 are connected to each other via two conductive plugs 374 passing through the third dielectric material plate 323. The fourth metal line 371 is used to equally distribute the input power to the fifth metal line 372 and the sixth metal line 373. The length of the fifth metal line 3 72 is designed to be longer than the sixth metal line 373 ^ by an odd multiple of λ / 2 or / 2, in which the wavelength of the artificial current causes the lower-side wide-side coupling microstrip line 342 to The center line A in the extension direction is a phase diagram b where the currents on two symmetrical parts of the axis of symmetry have 80 degrees between each other, and b is a sectional view showing the non-explosive structure shown in FIG. 3. It can be clearly seen from FIG. 5 that the thunder-guiding plug q 7 4 # η, * n ^ passing through the third 'electrical material plate 3 2 3 is connected to the fourth metal wire 371 above the mouth P knife. 371A and the lower part 371B are as described above. Booklet 2 ί In the invention of the ft invention, the current propagates in the anti-symmetric propagation mode and the combination of m :: all modes must be adjusted by appropriately adjusting the upper feed circuit I 4, the line 36 1 and the lower feed circuit 37 Wire 371 of /

Page 11 574768 V. Description of the invention (7) Inch 'allows the current to be unevenly distributed to the upper feed circuit 36 and the lower feed circuit 37' resulting in the total energy fed into the lower-side wide-side coupled microstrip line 342 being greater than the feed Enter the total energy of the upper broadside coupled microstrip line 3 41. This adjustment must also make the current on each part of the upper wide-side coupled microstrip line 341 and the light-strip microstrip line 3 4 2 on the lower I side have a current slightly larger than 180 degrees with each other. The phase difference is, for example, a phase difference of 96 degrees. With this configuration, the desired first-order mode of the microstrip line can be excited. In order to make the present invention easier to understand, the following uses a planar antenna 30 designed as a double-layer wide-side coupled microstrip line that can operate at 38.5 GHz as an example to describe the dimensions and materials of each component in detail. The first to third dielectric material plates 321 to 3 23 are all formed of a glass fiber material having a dielectric constant of 3.38 and each have a thickness of 0.2 mm. In the input circuit 35, the length of the input metal wire 3 51 in the X direction is 1.15 mm and the length in the Y direction is 1.2 mm ', and its impedance is 50 Ω at the designed frequency 3 8 · 5 GHz . In addition, the length of the in / 4 impedance conversion section 352 in the X direction is 115 mm and the length in the γ direction is 3.6 mm. The length of the output metal wire 353 in the X direction is 2.5 mm and the length in the Y direction is 2.5 mm. In the upper-layer feed-in circuit 36, the length of the first metal line 361 in the X direction is 2.45 mm and the length in the Y direction is 0.99 mm. In addition, the width of the second metal line 36 2 is 0.2 mm and the total length is 3.05 mm, and the width of the second metal line 3 63 is 0 _ 2 mm and the total length is 5. 75 mm. "In the lower-layer feed-in circuit 37, the length above the fourth metal line 371, 371.8, is 2 mm in the X direction and 0 q • u mm in the Y direction.

Page 12 574768 V. Description of the invention (8) The conductive plugs 3 74 are square posts, each side of the square cross section is 0.25 mm, and each conductive plug 374 is connected to the upper part 37 The distance from the center of the two orthogonal edges of the upper part 3 71A is 0.275 dragons. The length under the 37Γ part 371B in the direction is 2.05-and the length of U = is 0.9 mm. Each conductive plug 374 is connected to the lower part 371β, and the center is orthogonal to the two parts of the lower part 371B. The edges are all 0.275 mm ° the fifth metal wire 37 2 has a width of 0.2 mm and a total length of 3.5 mm. The sixth metal wire 3 73 has a width of 0.2 mm and a total length of 丨 · i. The upper wide-side coupled microstrip line 341 is 120 mm in the sense direction and 2.2 mm in the γ direction. The length of the lower wide-side coupled microstrip line 342 in the X direction is 120 mm and the length in the γ direction is 19 mm. In the manufacturing method of the planar antenna 30 using the double-layer wide-side coupled microstrip line according to the present invention, the first to third dielectric material plates 321 to 323 may be made of the same or mutually different dielectric materials such as ceramics or Formed by glass fibers. In addition, the ground metal sheet 31, the double-layer feed circuit structure 33, and the double-layer wide-side coupled microstrip line structure 34 must be accurately coated with a metal material such as copper by a conventional photo printing technique. The corresponding dielectric material is formed on a plate. In addition, in order to form two conductive plugs 3 74, two square through holes must first be opened in the third dielectric material plate 3 23 by using a fine drilling technique, and then a metal material such as Copper or gold to fill these two square through holes. According to this, the manufacture of the planar antenna 30 using the double-layer wide-side coupled microstrip line according to the present invention can be completed. It is clear from Figs. 3, 4 (a), 4 (b), and 5 that the planar antenna 30 of the application of the present invention with a double-layer light-strip microstrip line has a full-plane structure.

Page 13 574768 V. Description of the invention (9) The double-layer feed circuit structure 33 and the double-layer wide-side coupling are all completed in the same printed circuit process, so it is very much compared with the conventional technology and the application according to the present invention The planar antenna 30 with double-layer wide-side coupling is not only easy to design and manufacture, but also because of the manufacturing process, its cost is greatly reduced. In addition, this planar structure is also conducive to the integration of planar antennas using a double-layer wide-side coupled microstrip line 30 disk circuit and easily designing more practical planar antenna arrays and others ^ Figure 6 shows According to the present invention, a planar antenna array 50 in which planar antennas with double-layer wide-edge light-combined microstrip lines are arranged in parallel is used. Refer to Figure 6 'The impedance is 50. One end of the clever metal wire 51 can be easily integrated with the microwave front-end circuit (not shown), and the other end is connected with a first-stage power divider 5 2. . The first-stage power divider 52 is connected to two second-stage power dividers 53. Each second-stage power divider 53 is connected to two third-stage power dividers 54. Each third-stage power divider 54 is connected to two planar antennas 30 using a double-layer wide-edge dissipative microstrip line. Therefore, the planar antenna array 50 shown in FIG. 6 is composed of eight planar antennas 30 using double-layer wide-side coupled microstrip lines arranged in parallel, and the distance between two adjacent planar antennas 30 is the same. . FIG. 7 shows the first, second, or third stage power divider 52, 53, or 54 shown in FIG. Referring to FIG. 7, the power divider 52, 53, or 54 is composed of a metal wire 521, a λ / 4 impedance converter 522, and left and right symmetrical metal wires 5 23 and 5 24. Fig. 8 is a measurement result of the radiation pattern of the planar antenna array 50 shown in Fig. 7. In Fig. 8, the horizontal coordinate represents the azimuth and the vertical coordinate represents

Page 14 574768 V. Description of the invention (10) "--Elevation, draw the intensity of the radiation field in the form of contour. It is clear from FIG. 8 that according to the present invention, the obtained array 50 achieves a highly directional pencil beam (the antenna shown in FIG. 8 shows a male: upper part. Although the present invention has been exemplified by a preferred embodiment It should be understood by those who know that the present invention is not limited to the disclosed embodiments. ^ 5 Erming 'This invention is intended to cover modifications and similar configurations for those skilled in the art. Therefore, a patent is applied for The scope of the scope: Extensive interpretations of all kinds to accommodate all such modifications and similar configurations. For example, the first to second dielectric material plates 321 to 323 can use different thick sounds and σ qualities, or Is to use more dielectric material boards, depending on the actual needs of $ ^ =. In summary, the application of the double-layer wide-edge coupled micro-plane planar antenna according to the invention has the following advantages: () Double-layer feed circuit The structure can effectively stimulate the desired use; Lean leakage mode 'while avoiding the main mode or higher-order leakage mode of other microstrip lines that you want to avoid; (2) easy design, simple manufacturing, reduced size, and low production costs (2) Planar structure is favorable Microwave integrated front-end circuit, and easily design a more practical the antenna array; and (iv) planar array antenna can indeed achieve high gain of the pen-shaped beam, to replace the traditional dish.

Page 15 ^ 4768 Simple explanation of the diagram V. [Simplified description of the diagram] Figure 1 shows a kind of Xi 4-Figure; Plane-type Leaky Wave Sky Green Figure 2 shows another kind of practice A perspective view of the attack and leakage wave antenna 3 is a partial exploded view of the planar antenna according to the present invention; ~ FIG. 4 (a) shows the application plane shown in FIG. The third antenna is located in the third antenna: the top side of the second side is coupled with the wide side of the second layer ^ ^. «3 ^ ^ y" line; between the second side of the second side and the wide side; The non-explosive cross-sectional view of the dual-type antenna using the dual-type antenna shown in Figure 3 is shown. Figure 6 of the side-coupled microstrip line shows a series of parallel antennas based on the microstrip = Application of double-layer wide-edge vehicles Figure 7 shows the power Rongba w shown in Figure 6. Thousands-face antenna array; Results. Figure 8 shows the planar antenna shown in Figure 7; Explanation of symbols for measuring junction elements: .1 ^ conventional planar leak wave sky _ 11 dielectric material strip antenna 12 Teflon sheet 574768 Brief description of the formula 13 Metal patch 2 1 Rectangular waveguide 22 Rectangular dielectric strip line 24 Etched trench 30 Planar antenna using double-layer wide-side coupled microstrip line 31 Ground metal sheet 321 First dielectric material plate 322 Second dielectric Material plate 323 Third dielectric material plate 33 Double-layer feed circuit structure 34 Double-layer wide-side coupled microstrip line structure 341 Upper wide-side coupled microstrip line 342 Lower wide-side coupled microstrip line 35 Input circuit 351 Input metal line 352 λ / 4 impedance conversion section 353 output metal line 36 upper feed circuit 361 first metal line 362 second metal line 363 third metal line 37 lower feed circuit 371 fourth metal line 371 Α upper part of fourth metal line

574768 Brief description of the diagram 371B The portion below the fourth metal line 372 The fifth metal line 373 The sixth metal line 374 The conductive plug 50 The planar antenna array 51 The metal line 52 The first power divider 5 21 The metal line 522 λ / 4 impedance converter 523 metal wire 524 metal wire 53 second stage power divider 54 third stage power divider

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Claims (1)

574768 6. Scope of patent application-1. A planar antenna using a double-layer wide-side coupled microstrip line, including: an upper-layer feed circuit and a lower-layer feed circuit that are electrically insulated from each other; and an upper-layer wide-side turn The combined microstrip line and the lower-layer wide-side coupled microstrip line are electrically insulated from each other and extend in the same direction in parallel. The upper-layer wide-side coupled microstrip line is electrically connected to and fed from the upper-layer feed circuit. Excited by the circuit, and the lower-layer wide-side coupled microstrip line is electrically connected to the lower-layer feed circuit and is excited by the lower-layer feed circuit. 2 · The surface antenna using the double-layer wide-side coupled microstrip line as described in item 1 of the patent scope, where: == :: 3 ::: = The lower-layer wide-side coupled microstrip line stripline Width: The width of the combined microstrip line is greater than the width and light extension of the lower side of the lower layer. The center and line of the microstrip line and the lower side of the wide side coupled microstrip line in the Shen direction are aligned with each other. The application of the double-layer wide-side coupled microstrip line is flat. 3. If the patent application covers the first area antenna, it further includes: a first dielectric material plate and—and the second dielectric material plate forms an edge-coupled micro Strip line; second dielectric material plates stacked on each other, with the lower feed circuit and the lower wide ground metal sheet for grounding and adhesion to the first dielectric material Page 19 574768 6. Scope of Patent Application ♦ Board. 4. The planar antenna using the double-layer wide-side coupled microstrip line as described in item 3 of the patent application scope, wherein: the first and the second dielectric material plates are formed of glass fiber or ceramic iron magnet. 5. If the planar antenna using the double-layer wide-side coupled microstrip line of item 1 of the patent application scope further includes: a third dielectric material board for connecting the upper-layer feed circuit and the lower-layer feed circuit to each other It is electrically insulated, and at the same time, the upper-layer wide-side coupled microstrip line and the lower-layer wide-side coupled microstrip line are electrically insulated from each other. 6. The planar antenna using the double-layer wide-side coupled microstrip line as described in item 5 of the patent application scope, wherein: the third dielectric material plate is formed of glass fiber or ceramic ferromagnet. 7. The planar antenna using the double-layer wide-side coupled microstrip line as claimed in item 5 of the patent application scope further includes: an input circuit formed on the third dielectric material board and connected to the upper-layer feed circuit. 8. The planar antenna using the double-layer wide-side coupled microstrip line as claimed in item 7 of the patent application scope, wherein the input circuit includes: Page 20 574768 VI. Patent application scope-an input metal wire as an input terminal and can be connected to a microwave front-end circuit,-an I / 4 impedance conversion unit to achieve the conditions of impedance matching; and-an output metal wire It is used as a divider and converts the input impedance of the circuit into pure real value. 9. The planar antenna using the double-layer wide-edge coupled microstrip line as claimed in item 7 of the patent application scope, wherein the input circuit is formed of gold, silver, or copper using photo printing technology. 10. The planar antenna using a double-layer wide-side coupled microstrip line as described in item 1 of the patent application scope, wherein the upper-layer feed circuit includes a first metal line, a second metal line, and a third metal line The first metal wire is used to evenly distribute the input power to the second metal wire and the third metal wire, and the length of the third metal wire is designed to be longer than the length of the second metal wire, so that the The currents on the two symmetrical parts of the upper broad-side coupled microstrip line with the center line in the extension direction as the axis of symmetry have a phase difference of 180 degrees from each other. 11. The planar antenna using a double-layer wide-side coupled microstrip line as claimed in item 1 of the patent application scope, wherein the lower-layer feed-in circuit includes a fourth metal line, a fifth metal line, and a sixth metal line, The fourth metal wire is used to evenly distribute the input power to the fifth metal wire and the sixth metal wire, and the length of the fifth metal wire is designed to be longer than the length of the sixth metal wire. 574768 6. The scope of patent application makes the currents on the two symmetrical parts of the lower wide-side coupled microstrip line with the center line in the extension direction as the symmetrical axis having a phase difference of 180 degrees from each other. 1 2. A planar antenna using a double-layer wide-side coupled microstrip line as claimed in item 10 of the patent application scope, wherein the fourth metal line includes an upper part and a lower part, and the upper part is located in the upper-layer feed circuit On the same plane and the lower part is located on the same plane as the lower feed circuit, and the upper part and the lower part are connected to each other via two conductive plugs. 13. For the planar antenna using the double-layer wide-edge coupled microstrip line as described in the first patent application range, the upper layer and the lower-layer feed-in circuit and the upper-layer and lower-layer wide-side coupled microstrip line are printed by photo printing. Technology is made of gold, silver, or copper. 14. For a planar antenna using a double-layer wide-side coupled microstrip line, such as in item 1 of the scope of patent application, the upper-layer feed circuit and the lower-layer feed circuit are adjusted to distribute current unevenly, resulting in feed The total energy of the lower wide-side coupled microstrip line is greater than the total energy fed into the upper wide-side coupled microstrip line. 1 5. The planar antenna using the double-layer wide-side coupled microstrip line according to item 1 of the patent application scope, wherein the upper-layer feed circuit and the lower-layer feed circuit are adjusted so that the upper-layer wide-side coupled microstrip line The current on each part is perpendicular to the current on the part of the underlying broad-side coupled microstrip that corresponds to that part 574768 6. Scope of patent application There is a phase difference of slightly more than 180 degrees between each other. 16. —A planar antenna array comprising:-an even number of planar antennas using a double-layer wide-side coupled microstrip line as described in item 1 of the patent application, arranged in parallel at equal intervals; and a parallel feed circuit, A plurality of power equalizers are used to excite the even number of planar antennas using a double-layer wide-side coupled microstrip line. 1 7. The planar antenna array according to item 16 of the patent application, wherein each of the plurality of power dividers constituting the parallel feed circuit is formed of gold, silver, or copper. Page 23