TWI283945B - Dual-band dipole antenna - Google Patents

Abstract

A dual-band dipole antenna adapted to be disposed on a dielectric substrate comprises two substantially rectangular radiating metallic sheets and a coaxial transmission line. The substantially rectangular radiating metallic sheets are symmetrically disposed on two sides of the dielectric substrate with respect to the central line thereof, wherein each of the radiating metallic sheets further has a feeding point and a U-shaped slot. One feeding point is disposed opposite to the other feeding point, and the opening of the U-shaped slot is in the direction of the feeding point for dividing the substantially rectangular radiating metallic sheet into a larger sub-metallic sheet and a smaller one, wherein the former serves to generate a first (lower frequency) operating mode of the dual-band dipole antenna, and the latter serves to generate a second (higher frequency) operating mode thereof. The coaxial transmission line has a core conductor and an external ground conductor which are respectively connected to the feeding points.

Description

1283945 Case No. 911092 念8 修正 Amendment V. Description of the Invention (1) Field of the Invention The present invention relates to an antenna, and more particularly to a dual-frequency dual dipole antenna for a wireless local area network (WLAN) system. [Prior Art] · The rapid development of wireless transmission has brought about a variety of products and technologies for multi-frequency transmission, so that many new products have the performance for wireless transmission to meet the needs of consumers. For example, the inability of the frequent transmission of data from a notebook computer can be simplified by wireless transmission means. Therefore, the design of the antenna is quite important to achieve the purpose of wireless transmission. Furthermore, notebook computers with wireless transmission capabilities are critical to their appearance, size, and performance if they are to be widely accepted and affirmed in the market. Therefore, for a notebook computer, having a well-designed antenna is more important than the top. Conventional antennas generally suitable for wireless transmission products such as notebook computers are generally classified into two types, one of which is an inverted F-shaped panel antenna (P I F A ) and the other of which is a single dipole antenna. Both of these types are capable of producing an operational mode of 1/4 wavelength resonance. For example, U.S. Patent No. 5,9,6,1,9,9, issued to Kor isch, issued July 20, 2009, discloses a tablet antenna for use in a wireless transceiver device having first and second a first layer on the first surface, a unitary second layer on the second surface, having two radiating portions as an inverted F-shaped panel antenna (PIFA) and combining the radiation One of the connection parts, a grounding pin, and a feed pin. However, the grounding pin must extend through the substrate and structurally interconnect the first layer and the connecting portion of the second layer, and thus the antenna can be found

Page 7 1283945 _____ Case No. 91109228_ Year ___ V. Inventions (2) The manufacturing system is quite difficult and complicated. Moreover, such inverted F-shaped panel antennas typically have a narrow bandwidth such that their use is disadvantageously limited. While a single dipole antenna has a relatively large bandwidth, a relatively wide ground plane is required to achieve the desired radiation efficiency. Since the space provided for configuring an antenna in a notebook computer is relatively slender, the dual dipole antenna is also limited in use. Furthermore, conventional antennas can only be operated in a single frequency band at most, such as U.S. Patent No. 6,0 0 8,774, issued to Wu on December 28, 1999, entitled "For Wireless Data Communications." Printed antenna structure for wireless data. ('printed antenna structure for wireless data lines, printed dots, printed dots, connected to the hook-shaped antenna of the printed circuit board of the following table for the 2 · 4 G Η z band Under the growth of the field, it will not be enough to compete alone. The mainstream of the electronic products that are required to provide a dual-band dual-coupled 5·2GHz band) is the purpose of operating the notebook computer. l cai road board, a fishing surface, a feed-in surface, printed for WLAN operation, as the city can compete with the market, the antenna will be phased, such as 2 · 4 and its suitable for maintaining the product [ SUMMARY OF THE INVENTION A printed antenna of the present invention includes a printed electrical circuit on a surface of the printed circuit board and a ground plane. However, the antenna is only usable. Therefore, an antenna operating in a frequency band can be expected. Sex 'Development is applicable to the dual-band. The polar antenna can be in the dual-band and has a slender shape, so that the antenna can be hidden and the main purpose is to provide a dual-frequency dual dipole antenna.

Page 8 1283945 _ ‘ Case No. 91109228_年月日日__ V. Description of invention (3) Used in dual-band operation for WLAN operation. A secondary object of the present invention is to provide a dual frequency dual dipole antenna having an elongated shape that is particularly suitable for communication products such as notebook computers. To achieve the above object, the present invention provides a dual-frequency dual dipole antenna suitable for being disposed on a dielectric substrate and including two substantially rectangular light-emitting metal sheets and a coaxial transmission line, the substantially rectangular radiating metal sheet The two sides of the dielectric substrate are disposed symmetrically with respect to a center line of the dielectric substrate, wherein each of the reflective metal wires further has a feeding point and a U-shaped slot. A feed point is disposed opposite the other feed point, and the opening of the U-shaped slot faces the feed point. The coaxial transmission line has a center conductor and an outer ground conductor that are respectively connected to the feed point. According to another feature of the invention, each of the U-shaped slots is for dividing the corresponding substantially rectangular radiating metal piece into a larger sub-metal piece and a smaller metal piece, wherein the former is used to generate the dual frequency. One of the dual (low frequency) operating modes of the dual dipole antenna, and the latter is used to generate a second (high frequency) operating mode of the dual frequency dual dipole antenna. According to still another feature of the present invention, the length of the larger sub-metal piece can be selected to be about 1/4 wavelength of the center frequency of the first operational mode, and the length of the smaller sub-metal piece can be selected to be about the first The 1/4 wavelength of the center frequency of the second operating mode. According to still another feature of the invention, the center frequency of the first operational mode is about 2 · 4 G Η z 〇. According to still another feature of the invention, the center frequency of the second operational mode is about 5.2 GHz.

Page 9 1283945 13⁄4 91109228 Issue 5, Invention Description (4) Other objects, advantages, and novel features of the present invention will become more apparent from The present invention may be embodied in a variety of forms, and the embodiments shown in the drawings and the embodiments described hereinafter are preferred embodiments. It is to be understood that the invention is not intended to limit the invention to the particular embodiments illustrated. Referring to Figure 1, there is shown a top view of a dual frequency double dipole antenna 1 in accordance with a preferred embodiment of the present invention. The dual-frequency dual dipole antenna 1 includes two substantially rectangular radiating metal sheets 20, 30 and a coaxial transmission line 40. The rectangular radiating metal piece 20, 30 has its corresponding feed point 2 2, 3 2 and a U-shaped slot 2 4, 34 thereon. The coaxial transmission line 40 has a center conductor 42 and an outer ground conductor 44. The U-shaped slots 2 4, 3 4 further include corresponding first slits 245, 345, second slits 247, 347, and third slits 2 4 9, 3 4 9 , respectively. Fig. 2 shows a top view of the dual-frequency dipole antenna 1 on a dielectric substrate 5. In more detail, the radiating metal sheets 20, 30 are respectively and symmetrically disposed on opposite sides of the dielectric substrate 5, thereby forming the arms of the antenna 1 and being disposed by the printing or etching technique. on. According to the present invention, the dielectric substrate 5 is a printed circuit board made of BT (bisma 1 eimide -1 riazine) resin or FR 4 (fiberglass reinforced epoxy resi η ), and may also be a polyimide. (ρ ο 1 yimide ) A flexible film substrate produced. The feeding points 2 2, 3 2 are respectively arranged on the radiating metal piece 20, 30

Page 10 1283945 MM 91109228 V. INSTRUCTIONS (5) - Year Month 修正 Corrected to transmit the signal. The U-shaped groove is provided with a point 2 2, 3 2 square 弋 configuration, and the 4 series are respectively divided toward the feed with its opening into a so-called sophomore so that the radiating metal pieces 20, 30 belong to the piece 244, respectively. 344.嗲#大少子金属月242,342 and one of the smaller child gold wire 1 - (low i); Mulberry can be metal and \= 342 is used to generate = day 344 to generate the antenna}, : and the smaller sub-metal piece 244 'large child metal piece 242, S49 brother two (high frequency) operating mode, wherein the operating mode center frequency, the length can be selected to be about the first (low frequency) 344 The length can be selected to be .1 / 4 wavelength of the smaller metal piece 2^'. The middle...tomb Μ弟一(咼频) operates the modal center frequency to the feed point 22^,3. The line 42 and the outer ground conductor 44 are respectively connected. The figure 3 shows that the 9th test result is the return loss measurement result of the line 5 line 1. The fiber substrate has a thickness of 50 mm; the media/substrate 5 is a glass degree; the width of the two radiation metals H, 5 mm, and the thickness of the 〇·4 dragon are 4, and the right 兮 + 30 is printed. The length is about 23 dragons and the width is about the width. .5 core base: 5; the distance between the feeding points 22, 32 of the slotted slots 24, 34 < 24, 34 to the corresponding one, the first (low boxing, which is labeled " Α', the mark is about 5mm. Because the center frequency of the first (low 々) 模1 2 is about 2 45ΓΗ7, and the second (high frequency) operation T f hand, the spoon is 2.45GHz, The name #m社冰中心frequency is about 5. 25GHz. Then, under the definition of the electric anti-standing wave ratio (VSWR) less than 2, the first (low frequency) = for the blame 12 and the second (high frequency) operation mode The frequency of 2.4 GHz (2.4-2.484 GHz) and 5.2 GHz (35^5 for 5.35 GHz) of the frequency 14 WLAN operation. In addition, the antenna twist of this embodiment is only 5

Page 11 1283945 _ Case No. 911 (39228_月月日_||^_· V. Description of the invention (6) mm, and therefore very suitable for a notebook computer having only an elongated space for accommodating an antenna. Figure a and Figure 4b show top views of other embodiments of the radiation metal sheet 60, 70, 80, 90 of the present invention. These radiation metal sheets 6 0, 7 0, 8 0, 90 are similar. The radiating metal sheets 20, 30 shown in Fig. 2, and similar or corresponding elements are indicated by the same drawing numbers. The U-shaped slots 6 4, 7 4, 8 4, 9 4 respectively radiate the metal The slice 6 0, 7 0, 8 0, 90 is divided into larger sub-metal pieces 642, 742, 842, 94 2 and smaller sub-metal pieces 644, 744, 8 4 4, 9 4 4, wherein the former is used to generate One of the first (low frequency) operating modes of the antenna 1 and the latter for generating a second (high frequency) operating mode of the antenna 1. As shown in Figure 4a, the third slit 6 4 9 , 7 4 9 has a circular arc bend, and this configuration will produce substantially the same effect as in Fig. 2. In addition, the width of the third slit 8 4 9, 9 4 9 in Fig. 4 b can Selective adjustment so that The expected center frequency of the first (low frequency) and second (high frequency) operating modes for a variety of different applications can be obtained. For example, the width of the third slit 8 4 9, 9 4 9 can be The direction of the feed point 2 2, 3 2 is increased to reduce the length of the smaller sub-metal sheet 8 4 4, 94 4 in order to reduce the center frequency of the second (high frequency) operating mode. Similarly, The position of the U-shaped slot 2 4, 3 4 shown in Fig. 2 is longitudinally movable relative to the radiating metal piece 2 0, 30 to facilitate simultaneous change of the first (low frequency) and second (high frequency) operating modes. The two center frequencies. Further, the length of the radiating metal piece 20, 30 may extend outwardly relative to the U-shaped slot 2 4, 34 to facilitate reducing the center frequency of the first (low frequency) operating mode. Therefore, to obtain the first (low frequency) operational modal center frequency and the second

Page 12 1283945 _ Case No. 91109228_Yearly Month Day Correction '_ V. Invention Description (7) (High Frequency) Operation of the modal center frequency with different ratios of dual-frequency operation, the 诸如 such as shown in Figure 2 can be modified The slot hole 2 4, 3 4 or the radiating metal piece 2 0, 30 component, thereby designing a dual-frequency dual dipole antenna suitable for 2. 4/5. 2 GHz dual-band WLAN operation. Moreover, the two resonant frequencies (the center frequencies of the first and second operational modes) do not require additional matching circuitry to be applied to the antenna 1 to achieve good impedance matching. While the foregoing description and drawings are directed to the preferred embodiments of the embodiments of the invention The spirit and scope of the principle. It will be appreciated by those skilled in the art that the present invention may be modified in many forms, structures, arrangements, ratios, materials, components and components. Moreover, the actual use of the present invention is particularly applicable to particular environmental and operational needs without departing from the principles of the invention. Therefore, the embodiments disclosed herein are to be considered as illustrative of the invention and are not intended to limit the invention. The scope of the present invention is defined by the scope of the appended claims, and the legal equivalents thereof are not limited to the foregoing description.

Page 13 1283945 Case No. 91109228 曰 修正 Correction Schematic Brief Description [Illustration] Fig. 1 is a top view showing one of the dual-frequency bisdiopole antennas according to a preferred embodiment of the present invention. Figure 2 is a top view of a dual-frequency dual dipole antenna disposed on a dielectric substrate. Figure 3 is the antenna return loss measurement result of Figure 2. 4a and 4b are other embodiments of the radiation metal sheet of the present invention. Figure 1 Dual frequency dual dipole antenna 5 dielectric substrate 12 First (low frequency: ) operating mode 14 second (south frequency, ) operation 20 rectangular radiating metal sheet 22 feed point 24 U-shaped slot 30 rectangular radiating metal piece 32 feed point 34 U-shaped slot 40 coaxial transmission line 42 Center conductor 44 Outer ground conductor 60 Radiation metal sheet 64 U-shaped slot 70 Radiation metal sheet 74 U-shaped slot 80 Radiation metal sheet 84 U-shaped slot 90 Radiation metal sheet 94 U-shaped slot 242 Larger metal piece 244 Small child metal sheet 245 first slit 247 second slit 249 second slit 342 larger sub-metal piece 344 smaller sub-metal piece

Page 14 1283945 Case No. 91109228 ¥ Simple explanation of the monthly correction pattern 3 4 5 First slit 3 4 9 Third slit 6 4 4 Smaller metal sheet 7 4 2 Larger metal sheet 74 9 Third narrow Seam 8 4 4 smaller child metal piece 942 larger child metal piece 9 4 9 third slit 3 4 7 second slit 642 larger child metal piece 6 4 9 third slit 744 smaller child metal piece 842 Big son metal piece 8 4 9 third slit 944 small child metal piece

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Claims (1)

1283945 _ Case No. 91109228 : _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The center line of the substrate is symmetrically disposed on both sides of the dielectric substrate, thereby forming two arms of the dual-frequency dual dipole antenna, wherein each of the substantially rectangular radiating metal sheets further has a feeding point disposed opposite to the other a feed point for transmitting a signal; and a U-shaped slot having an opening facing the feed point for dividing the substantially rectangular radiating metal piece into a larger sub-metal piece and a smaller sub-metal piece Wherein the former is used to generate a first (low frequency) operating mode of the dual frequency dual dipole antenna, and the latter is used to generate a second (high frequency) operating mode of the dual frequency dual dipole antenna; The coaxial transmission line has a center conductor and an outer ground conductor, respectively connected to the feed point. 2. The dual-frequency dual dipole antenna according to claim 1 of the patent application, wherein each of the larger sub-metal strip lengths may be selected to be about 1/4 wavelength of the center frequency of the first operational mode, and each smaller The length of the metal sheet may be selected to be about 1/4 wavelength of the center frequency of the second operational mode. 5GHz。 The dual-frequency dual-dipole antenna according to the scope of the patent application, wherein the first operating mode center frequency is about 2. 4GHz. 4. The dual-frequency dual dipole antenna according to item 2 of the patent application scope, wherein the second operating mode has a center frequency of about 5 · 2 G Η z. Page 16 1283945 _ Case No. 91109228_年月日日__ VI. Patent Application Range 5. According to the dual-frequency dual dipole antenna of claim 1, the substantially rectangular metal plate is printed. On the dielectric substrate. 6. The dual frequency dual dipole antenna according to claim 1 of the patent application, wherein the substantially rectangular radiating metal piece is engraved on the dielectric substrate. 7. The dual frequency dual dipole antenna according to claim 1, wherein each U-shaped slot comprises: a first slit; a second slit maintained at a distance from the first slit And a third slit having one end connected to one end of the first slit and the other end connected to one end of the second slit, and the other end of the first and second slits is placed on the first The same side of the three slits. 8. The dual frequency dual dipole antenna of claim 7, wherein each third slit is substantially perpendicular to the first and second slits. 9. The dual-frequency double dipole antenna according to item 7 of the patent application scope, wherein each of the third slits has a circular arc shape. 1 双. A dual-frequency dual dipole antenna according to claim 1 of the patent application, wherein each U-shaped slot is disposed at a position relative to the substantially rectangular radiating metal sheet Page 17 1283945 Page 18 1283945 _ Case No. 91109228 • Year Month Day __ I. The case has been applied for patents from the country (region) Application for the deadline Case number Claiming Article 24 of the Patent Law First priority 2. Claiming the first priority of Article 25 of the Patent Law: Application No.: Innocent Period: 3. Claim that the case is in accordance with the first paragraph of Article 20 of the Patent Law. Period of the second paragraph of the stipulations of the book: IV. □ The relevant microorganisms have been deposited abroad: Host country: Bu Depository: # 存日期: Hosting number: □ The relevant micro-organisms have been deposited in the country (the hosting institution designated by this Council): Depository: Deposit period: None Deposit 5 Tiger code: □ Those who are familiar with the technology are easy to obtain and do not need to be registered. Page 6