TWM498974U - Antenna device - Google Patents

Description

Antenna device

The present invention relates to an antenna device, and more particularly to an antenna device that can miniaturize a circuit board and maintain a bandwidth.

According to the antennas in the current common wireless communication devices, the pursuit of bandwidth expansion and efficiency is maximized, wherein the excellent representation of the antenna is represented by a Voltage Standing Wave Ratio (VSWR) for display. The antenna receives or transmits the signal ratio of the relevant frequency band, and the antenna is currently applicable to single-band, dual-band, triple-band or quad-band, such as wideband code division multiplexing system (WCDMA), code division multiple access system (CDMA), global Mobile communication systems (GSM), digital communication systems (DCS), or personal communication service systems (PCS) have different specifications, but single-frequency, dual-frequency, and tri-band are mostly limited, but quad-band is currently The best application. In this regard, in June 1996, the Republic of China, National Central University, Institute of Electrical Engineering, Master's thesis "Development of a wide-band coplanar waveguide feeding circular single dipole antenna", which revealed a monopole antenna, please refer to the first figure A matching substrate 11 is formed on one side of the substrate 10, and a circular radiator 110 is formed at one end of the matching path 11 , and one side of the matching path 11 is formed. A first grounding portion 12 is formed, and a second grounding portion 13 is formed on the other side of the matching path 11. The first grounding portion 12 and the second grounding portion 13 are symmetrical with each other, and a signal shaft joint 14 is utilized. The first grounding portion 12 and the second grounding portion 13 are respectively fixed on the first grounding portion 12, The signal shaft connector 14 has a feed end 141 such that the feed end 141 is fixed to the matching path 11.

In the above-mentioned "monopole antenna", the above-mentioned technical solution can achieve better characteristics such as voltage standing wave ratio and efficiency through the circular radiator 110 and the specific size of the first ground portion 12 and the second ground portion 13, but The substrate 10 is also enlarged due to the enlargement of the circular radiator 110 and the first ground portion 12 and the second ground portion 13, so that the outer casing of the substrate 10 is excessively large, and the metal wire and the substrate are If the contact area is too large, the current flowing through the circular radiator 110 and the first ground portion 12 and the second ground portion 13 may be uneven, and the characteristics of the impedance matching bandwidth are not good, for example, When multiple sets of "monopole antennas" are installed at the top of the building or in the antenna equipment box, it is easy to cause installation and use space, which is not suitable for the purpose of miniaturization. Therefore, how to improve the above-mentioned deficiencies is the technical difficulty point that the applicant of this case wants to solve.

In view of the existing coplanar waveguide antenna, the use of a larger radiator and a symmetrical ground portion to complete antenna impedance matching is prone to excessive volume and affects the space occupied by the antenna installation. Therefore, the purpose of the present invention is to develop a An antenna device that is compact in size and maintains a wide bandwidth.

In order to achieve the above objective, the present invention provides an antenna device, comprising: a printed circuit board body, a radiator is formed on one side of the printed circuit board body, and a side extension of the radiator is formed. a high-frequency conductive path of a specific length, wherein the parallel sides of the high-frequency conductive path are provided with a symmetrical first low-frequency conductive path, and the same end of the first low-frequency conductive path is bent by 90° away from the direction of the radiator Connected and surrounds the high frequency conductive path, And the pair of the first low-frequency conductive paths are bent in opposite directions in opposite directions to form a symmetric second low-frequency conductive path, and between the opposite sides of the high-frequency conductive path and the pair of first low-frequency conductive paths Forming a symmetrical matching conductive path, and the surrounding portions of the pair of second low-frequency conductive paths are respectively provided with a plurality of mutually arranged hollow slots; wherein the first low-frequency conductive path and the high frequency are disposed One of the conductive paths of the signal transmission line.

Wherein the radiator is provided with a first radiating portion and an intersection of the second radiating portion, and the first radiating portion and the second radiating portion are circular, elliptical, rectangular, triangular or geometric, and the printed circuit The radiator formed on the plate body and the high-frequency conductive path receive a four-frequency wide-band signal, and the slots are text-like slots, digital slots, circles, ovals, rectangles, triangles, or geometric shapes. a slot of a shape or an irregular shape, and the pair of the second low frequency conductive path is bent away from the same end of the radiator by 90° to form a connection and surround the pair of first low frequency conductive paths.

By using the impedance matching of the matching conductive path and the hollowed-out slots arranged on the pair of the second low-frequency conductive paths, the present invention can achieve the miniaturization of the circuit board size and the maintenance of the bandwidth width. .

[Use]

10‧‧‧Substrate

11‧‧‧ Matching path

110‧‧‧Circular radiator

12‧‧‧First grounding

13‧‧‧Second grounding

14‧‧‧Signal shaft connector

141‧‧‧Feeding end

[this creation]

20‧‧‧Printed circuit board body

21‧‧‧ radiator

211‧‧‧First Radiation Department

212‧‧‧Second Radiation Department

22‧‧‧High frequency conductive path

23‧‧‧First low frequency conductive path

24‧‧‧Second low frequency conductive path

241‧‧‧Slots

25‧‧‧Matching conductive paths

26‧‧‧Signal transmission line

261‧‧‧ Signal Grounding Department

262‧‧‧Signal Connection

The first figure is a schematic plan view of the habit.

The second drawing is a schematic plan view of a preferred embodiment of the present invention.

The third figure is a schematic diagram of the application of the preferred embodiment of the present invention.

The fourth figure is a schematic diagram of the voltage standing wave ratio and its frequency of the preferred embodiment of the present invention.

In order for your review board to have a clear understanding of the content of this creation, please refer to the following description only.

Please refer to the second figure, which is a schematic plan view of a preferred embodiment of the present invention. The present invention provides an antenna device comprising: a printed circuit board body 20.

The printed circuit board body 20 is preferably formed with a long rectangular type, such that a radiator 21 is formed on one side of the printed circuit board body 20. In the embodiment, the radiator 21 is provided with a first radiating portion 211 and One of the second radiating portions 212 intersects, and the first radiating portion 211 and the second radiating portion 212 are circular, elliptical, rectangular, triangular or geometric, but it is preferable to use a circular or elliptical shape. Intersecting, having a maximum receiving signal area and occupying a space, and extending a side of the radiator 21 to form a specific length of the high-frequency conductive path 22, and the radiator 21 formed on the printed circuit board body 20, The high-frequency conductive path 22 receives a four-frequency wide-band signal, which may also be referred to as a long-term evolution (LTE) signal, and the parallel sides of the high-frequency conductive path 22 are provided with a symmetrical first low-frequency conductive path 23, and In the direction away from the radiator 21, the same end of the first low-frequency conductive path 23 is bent and extended by 90° and surrounds the high-frequency conductive path 22, and the opposite ends of the pair of first low-frequency conductive paths 23 are respectively bent in opposite directions Flatten Extending and forming a symmetrical second low frequency conductive path 24, and forming a symmetric matching conductive path 25 between the opposite sides of the high frequency conductive path 22 and the pair of first low frequency conductive paths 23, and the pair of second The surrounding of the low-frequency conductive path 24 is respectively provided with a plurality of hollow slots 241 arranged in a mutually arranged manner. Therefore, the slots 241 can be arranged in the shape of the slot 241, the slot 241 of the digital shape, and the circle. a slot 241 of a shape, an ellipse, a rectangle, a triangle or a geometric shape or an irregular shape, but is preferably provided in a rectangular shape. The slot 241 is such that the pair of second low-frequency conductive paths 24 can shorten its length and maintain the function of impedance matching, and can reduce the volume of the printed circuit board body 20 to achieve the purpose of reducing the volume of the circuit board. And wherein the same end of the pair of second low frequency conductive paths 24 farthest from the radiator 21 can be bent and extended by 90° and surrounds the pair of first low frequency conductive paths 23, and preferably farthest from the radiator 21 The pair of second low frequency conductive paths 24 at the same end may be disconnected to form a conductive loop, and the impedance matching characteristics thereof may be maintained to reduce the use cost of the metal wires.

Please refer to the third figure, and the third figure is a schematic diagram of the application of the preferred embodiment of the present invention. The signal transmission line 26 is provided with a signal grounding portion 261 and a signal connection portion 262, and the signal grounding portion 261 is fixed to the bending connection point of the pair of first low frequency conductive paths 23, The signal connection unit 262 is fixed to the high-frequency conductive path 22, so the LTE network is suitable for a considerable number of frequency bands, and the frequency bands selected by different regions of different countries are different. Taiwan is currently using 700/900/ 1800MHz, which is expected to open to 2600MHz or higher.

Therefore, please refer to the second, third and fourth figures, and the fourth figure is a schematic diagram of the voltage standing wave ratio and its frequency of the preferred embodiment of the present invention. The first intercepting point frequency is about 0.7 GHz and the voltage standing wave ratio is about 3, the second intercepting point frequency is about 0.96 GHz and the voltage standing wave ratio is about 2.4, and the third intercepting point frequency is about 1.7 GHz and its voltage standing wave ratio is about 2.4, its fourth intercept point frequency is about 1.9 GHz and its voltage standing wave ratio is about 2.5, and its fifth intercept point frequency is about 2.0 GHz and its voltage standing wave The ratio is about 2.6, the sixth intercept point frequency is about 2.2 GHz and the voltage standing wave ratio is about 2.8, and the first to sixth intercept points have a voltage standing wave ratio of no more than 3, and preferably, The seventh intercept point frequency above 2G is about 2.3 GHz and its voltage standing wave ratio is about 2, and the eighth intercept point frequency is about 2.7 GHz and is relatively opposite to its voltage. With a Bobby of approximately 1.6, this creation enables full-band operation and reduces the size of the printed circuit board body 20 up to approximately 3.8 GHz for future communication protocol needs.

In the above, as shown in the second figure, the impedance matching of the matching conductive path 25 and the hollow slots 241 arranged on the pair of the second low-frequency conductive paths 24 are further used by the present invention. This creation can achieve the effect of miniaturizing the board size and maintaining the bandwidth width.

The above discussion is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; therefore, equivalent structural changes and modifications made without departing from the spirit and scope of the present invention should be Within the scope of the creation of the patent.

20‧‧‧Printed circuit board body

21‧‧‧ radiator

211‧‧‧First Radiation Department

212‧‧‧Second Radiation Department

22‧‧‧High frequency conductive path

23‧‧‧First low frequency conductive path

24‧‧‧Second low frequency conductive path

241‧‧‧Slots

25‧‧‧Matching conductive paths

Claims (6)

An antenna device comprising: a printed circuit board body, a radiator is formed on one side of the printed circuit board body, and a specific length of the high frequency conductive path is formed by one side of the radiator a symmetrical first low-frequency conductive path is disposed on the parallel sides of the high-frequency conductive path, and the same end of the first low-frequency conductive path is bent and extended by 90° away from the high-frequency conductive path, and away from the radiator. Forming a symmetrical second low-frequency conductive path in parallel with the other end of the first low-frequency conductive path, and forming a symmetric second low-frequency conductive path between the opposite sides of the high-frequency conductive path and the pair of first low-frequency conductive paths a symmetric matching conductive path is disposed, and the surrounding portions of the pair of second low frequency conductive paths are respectively provided with a plurality of mutually arranged hollow slots; wherein the first low frequency conductive path and the high frequency conductive are disposed One of the path signal transmission lines. The antenna device of claim 1, wherein the radiator is provided with a first radiating portion and an intersection of a second radiating portion. The antenna device of claim 2, wherein the first radiating portion and the second radiating portion are circular, elliptical, rectangular, triangular or geometric. The antenna device of claim 1, wherein the radiator formed on the printed circuit board body and the high-frequency conductive path receive a four-frequency broadband signal. The antenna device of claim 1, wherein the slots are text-like slots, digital slots, circular, elliptical, rectangular, triangular or geometric or irregularly shaped slots. The antenna device of claim 1, wherein the pair of second low-frequency conductive paths are bent away from the same end of the radiator by 90° and are integrally formed and surround the pair of first low-frequency conductive paths.