TW452996B - Chip type antenna - Google Patents

Abstract

The invention relates to a chip type antenna comprised by a substrate, a feeding port, a feeding wire, a matching unit and a meander conductor, in which the substrate is formed of dielectric material and the length of the variable meander conductor can control the center frequency of the antenna. The matching unit is composed of a grounded floor and a matching metal conductor, in which the matching metal conductor provides transmission function upon short-circuit to allow antenna achieving broadband effect ideal for being applied to wireless LAN and personal mobile communication transmission equipment.

Description

452996 V. Description of the invention

The invention is a chip-type antenna, a special area network communication device, and a broadband chip-type antenna for short-range wireless communication. When designing a personal wireless mobile communication device, due to size considerations, a quarter-wave monopolar antenna 10 as shown in Figure 1 is usually used as a component. In addition, personal wireless mobile communication devices are gradually moving towards lighter, thinner, shorter, and smaller. Therefore, the idea of further reducing the length of the linear antenna in a meandering manner with a special shape was first proposed in 1984. H. Nakano, H. Tagami, A. Yoshizawa, and J. 1984

Mr. Yamauchi disclosed a zigzagging and a meandering in IEEE Trans. Antennas Propagat. Issue AP-32, "In" Shortening ratios of modified dipol antennas' 1 — Article, pages 385-386. Zigzag Antenna. (Annex 1) Another bow-shaped zigzag antenna was adopted by M. A1 i and SS Stuchly at the IEEE AP-S International Symposium in 1996 at "A Meander-Line Bow-Tie Antenna" The article, pages 1566-1569, proposes to shorten the antenna even more. (Annex II)

A conventional chip-type antenna (c h i P

Page 4 5 2 9 9 6 V. Description of the invention (2) antenna) 20 (European patent 0 762 539 A1), please refer to Figure 2. This chip-type antenna uses a dielectric material and / or a magnetic material as the substrate 22, meanwhile, a metal conductor 24 is zigzag into a square waveform, or zigzag (not shown), and placed flat on The substrate surface or in the substrate, and one end of the meandering metal conductor 24 is directly used as a feeding point 26 of the chip-type antenna, and is connected to a feeding port 28. The design principle is to use the material characteristics of the chip, the length of the metal conductor, and the number of times the metal conductor is twisted to form a self-matching effect to achieve the antenna's resonance and radiation. The disadvantage is that the reduction in size of the wafer is limited. Another conventional chip antenna 30 (European patent 0764 999 A1) is shown in the figure ~~. A capacitor device 34 is connected in parallel to the feed line of a spiral wound conductor 32 to reach the antenna. Matching efficacy. Although it can reduce the size of the chip, the frequency bandwidth is not easy. The present invention proposes that a matching unit (matching antenna) is very effective because the chip antenna needs to increase the bandwidth of a substrate, a feed port, a feed line, — Un it) and a zigzag metal conductor increase the bandwidth. Including the plural. Substrate surface Among them, a zigzag metal guide of the present invention is based on a dielectric and a feed port is provided to provide a feed signal.

45299 6 V. Description of the invention (3) The body conductor is placed on the base as a radiation unit. And another metal conductor is placed on the substrate as the feed line of the antenna, and one end thereof is connected to the feed port 'to conduct a signal. The matching unit of the present invention is composed of a matching metal conductor placed on a substrate and a ground plane placed on the surface of the substrate, and the matching metal conductor is covered by a panel on the ground plane. The first end of the matching metal conductor is connected to the first end of the zigzag metal conductor, the second end of the matching metal conductor is connected to the other end of the feed line, and the third end of the matching metal conductor is connected to the ground plane. Match the radiation effect and bandwidth of the antenna. In this way, a larger bandwidth is obtained than the two chip-type antennas described previously, and the overall size of the antenna can be reduced. Detailed description of the invention Fig. 4 is an exploded view of an embodiment of a chip-type antenna of the present invention. The antenna substrate 41 is made of a dielectric such as ceramic, glass fiber, and the like. In this example, a metal conductor 42 (for example: gold, silver, silver palladium, copper, or an alloy thereof) is placed on the substrate 41 in a zigzag pattern. The first end of the zigzag metal conductor 42 is connected to a match. The first end 丄 of the metal conductor 45 and the second end are freely zigzagging along the direction perpendicular to the welding surface 44 of the feed-in port 43 to shorten the overall length of the chip-type antenna while making its equivalent resonance length and characteristic trend. Nearly a quarter-wavelength single-polarized antenna. In addition, a metal conductor is used as the feed line 46 of the antenna. One end of the feed line 46 is connected to the lock port 43 and the other end is connected to the second end of the matching metal conductor 45.

452996 V. Description of the invention (4) In this way, we can affect the center frequency of the antenna by controlling the length of the meandering metal conductor 42. In addition, we place the zigzag metal conductor 42 on the surface of the substrate 41, or we can place all or part of it on the inner layer of the substrate 41 (not shown). Among them, the shape of the metal conductor 42 may be zigzag into a square wave shape or a zigzag shape, and in addition to being zigzag into a plane type, it may also be zigzag into a spiral wounding to adjust the antenna size. As the number of twists and turns of the meandering metal conductor 42 increases, the radiation resistance of the antenna will decrease, and the effect of inductance will increase, eventually reducing the radiation efficiency and bandwidth of the overall antenna. Therefore, the present invention uses a matching unit to increase the radiation efficiency and bandwidth of the antenna. The matching unit in this embodiment adopts a stripe transmission line (strip 1 ine) architecture, and is composed of a ground plane 47 having a two-layer panel and a matching metal conductor 45 covered by the panel of the ground plane, and The ground plane 47 is connected to the third end of the matching metal conductor to cause a short-circuit transmission effect. In addition, we can design the length and width of the matched short-circuit transmission line to obtain the input impedance of the antenna to achieve the desired width. Figure 5 shows the measurement results of the antenna characteristics of this embodiment. In this embodiment, the center frequency of the antenna is designed at 2.44 GHz, and its -dB bandwidth can reach 220 MHz (about 9.2%).

45299 6

In order to further reduce the human inch's matching unit of Yunai, another embodiment shown in Figure 6 is designed to adopt a microstrip 1 ine architecture. The wafer ^ substrate 61, the zigzag metal conductor 62, the feed port 6 3, and the feed line ′ of this embodiment are composed of ^ ^, a horn line 66, and a matching 7L. A square-wave zigzag metal conductor 62 is placed on the base 61, one of which matches the first end of the metal conductor 65, and the other end freely zigzags along the vertical interface king and in the direction of the welding surface 64 which is forced to enter. In addition, the other- wise guide will give you a feed line 66 as an antenna, one end of the feed line 66 is connected to the feed port 63, and the end is connected to the second end of the matching metal conductor 65. In this embodiment, the element [: element 'is composed of a ground plane 67' and a matching gold conductor 65 covered by a panel of the ground plane ', and the ground plane 67 is connected to the third end of the matching metal conductor 65, causing short-circuit transmission. effect. Similarly, we can design the length and width of this short-pass wheel line to obtain the matching of the antenna input impedance—to achieve a wideband result. And 'Because the ground plane is only distributed on one surface of the chip, its area becomes smaller, so that it can free up some space for the zigzag. In order to adjust the center frequency of the antenna, you can shorten the zigzag metal conductor as shown in Figure 7 (a). Freely advance the length of one end 710 to increase the center frequency of the antenna. In the embodiment of FIG. 7 (a), the planarized meandering metal conductor 711 is placed on one surface of the substrate. The feed line 713 is placed on the same level as a line segment 715 of the matching metal conductor and the meandering metal conductor 711, and

452996 V. Description of the invention (6) A line segment 71 7 passes through a plurality of planes and is connected to the ground plane (not shown in the figure) on the base surface at the end point 7 1 9. In addition, the feeding line and the matching metal conductor of the present invention can be implemented with different lengths and widths. Please refer to the embodiment of FIG. 7 (b). The meandering metal conductor can also be folded to reduce the center frequency of the antenna. The main body 720 of the zigzag metal conductor is placed on a surface layer of the base. The first end 721 of the zigzag metal conductor is connected to a line segment 7 2 2 of the matching metal conductor, and the line segment 722 of the matching metal conductor passes through a plurality of layers and is placed in a connection. Feed line 723 on one surface of the base. And we can zigzag the end of the freely advancing end of the zigzag metal conductor (724) 'After passing through multiple layers' and then zigzag the last line segment ms on the other layer of the base. In addition, the matching metal conductor segment 722 continues to pass through the complex plane, and then turns into a line segment 726 and is placed on the other plane of the base, and then passes through the complex plane (727). The ground plane of the surface (not shown in the figure) is connected. The meandering metal conductor of the present invention can control the center frequency of the antenna and reduce the overall size of the antenna ', while the matching unit matches the input impedance of the antenna at the input end. In this way, through the connection of these two parts, a broadband result is obtained / effectively reduced in size. Many of the above embodiments are just examples for the convenience of description. Under the spirit and scope of the scope of patent application below, other similar techniques can be used to implement different implementations of the present invention.

4 52 99 6 Brief description of the diagram Figure 1 is a schematic diagram of a quarter-wavelength single-polarized antenna; Figure 2 is a schematic diagram of a conventional chip-type antenna; Figure 2 is a schematic diagram of another traditional-type chip-type antenna; The chip-type antenna of the present invention—a schematic diagram of an embodiment; FIG. 5 is a diagram showing the measurement results of the antenna characteristics of the embodiment of FIG. 4; FIG. 6 is a schematic diagram of an example of a chip-type antenna of the present invention. Figure 7 (a) is a schematic diagram of an embodiment of the zigzag metal conductor, feed line and matching metal conductor of the present invention; and Figure 7 (b) is a schematic diagram of an embodiment of the zigzag metal conductor, feed line and matching metal conductor of the present invention; Description: 10 to 1/4 wavelength single-polarized antenna; 20 to chip antenna; 22 to base; 24 to zigzag metal conductor; 26 to feed end; 28 to feed 珲; 30 to chip antenna; 32 to zigzag Metal conductor; 34 ~ series capacitor; 4 substrate; 42 ~ tortuous metal conductor; 43 ~ feed port; 44 ~ soldering surface; 45 ~ matching metal conductor; 46 ~ feeder line; 47 ~ ground plane; 61 ~ substrate; 62 * · Zigzag metal conductor; 63 ~ feed port; 64 ~ welding surface; 65 ~ matching metal conductor; 66 ~ feed line; 67 ~ ground plane; 710 ~ tortuous metal conductor end; 711 ~ tortuous metal conductor; Incoming line; 715 ~ GL with metal conductor line segment; 717 ~ matching metal conductor line segment; Ή9 ~ end point; 720 ~ tortuous metal conductor; 721 ~ connecting end point; 722 ~ matching metal conductor line segment; 723 ~ feed line; 724 ~ tortuous metal Conductor segment; 725 ~ Zigzag Conductor runs; 726~ matching metal conductor segments; match ~ 727 metal conductor segments; 72 8~ connection endpoint.

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Claims (1)

a 52 99 G Sixth, the scope of patent application 1, a chip-type antenna, which includes: a substrate made of dielectric, including a plurality of layers; a feed port on the surface of the substrate to provide a feed signal; A feed line is placed on one level of the base, and one end is connected to the feed port to conduct signals; a meandering metal conductor is placed on the base; and a matching unit is placed on the base, located on the feed port and the tortuous metal The conductors are connected to the feed line and the meandering metal conductor to match the light emission effect of the antenna. 2. The chip-type antenna according to item 1 of the scope of patent application, wherein the matching unit further comprises: a ground plane with at least one layer of ground panel placed on the substrate; and a matching metal conductor placed on the substrate, Covered by a panel of the ground plane, wherein the first end of the matching metal conductor is connected to the first end of the zigzag metal conductor, the second end of the matching metal conductor is connected to the feed line, and the third end of the matching metal conductor Connect this ground plane for short-circuit transmission. 3. The chip-type antenna according to item 2 of the scope of patent application, wherein the ground plane is provided with a two-layer ground panel. 4. The chip-type antenna according to item 1 or 2 of the patent application scope, wherein the dielectric is a ceramic material. Page 12 4 5299 6 VI. Patent application scope, year, no arrest 5. The chip-type antenna described in item 1 or 2 of the patent application scope, wherein the second end of the meandering metal conductor is perpendicular to the feed Freely zigzag forward in the direction of one of the welding surfaces 6 6. The chip-type antenna described in item 1 or 2 of the scope of patent application, wherein the zigzag shape of the zigzag metal conductor is a square wave shape or a zigzag shape. 7. The chip-type antenna according to item 1 or 2 of the scope of patent application, wherein the zigzag metal guide system is placed flat on a layer of the substrate. 8. The chip-type antenna according to item 1 or 2 of the scope of patent application, wherein the zigzag metal conductor is a three-dimensional type or a planar three-dimensional hybrid type, and is placed on different layers of the substrate in a zigzag manner. 9. The chip-type antenna according to item 2 of the scope of patent application, wherein the feed line, the matching metal conductor, and the meandering metal guide system are placed on different levels of the substrate. 10. The chip-type antenna according to item 7 of the scope of patent application, wherein the feed line and the meandering metal conductor are placed on the same level of the substrate. 11. The chip-type antenna according to item 3 of the scope of patent application, wherein the ground panels are placed on the surface of the substrate. Page 13