CN2718806Y

CN2718806Y - Multifrequency antenna

Info

Publication number: CN2718806Y
Application number: CNU2004200259501U
Authority: CN
Inventors: 林宪助; 戴隆盛; 洪振达
Original assignee: Foxconn Kunshan Computer Connector Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Foxconn Kunshan Computer Connector Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2004-03-29
Filing date: 2004-03-29
Publication date: 2005-08-17
Anticipated expiration: 2014-03-29

Abstract

The utility model discloses a multi-frequency antenna, comprising a first radiating part, a second radiating part, a ground part, a connecting part and a feed line, wherein the first radiating part, the second radiating part, the ground part and the connecting are integrated design. The internal conductor of the feed line and the connecting part are electrically connected, and the external feed line and the ground part are electrically connected. The ground part is provided with a slot, and the slot can adjust the inputting impedance of the multi-frequency antenna in order to make the multi-frequency antenna achieve optimal impedance matching.

Description

Multifrequency antenna

[technical field]

The utility model relates to a kind of multifrequency antenna, refers to a kind of multifrequency antenna that is used on the various electronic equipments especially.

[background technology]

Along with the continuous development of wireless communication technique, the integrated product of radio communication product and other electronic product becomes more and more popular, and the mobile computer with wireless communication function is exactly one of them.For the mobile computer with above-mentioned functions, wherein the antenna that is assembled is very important parts.

In the prior art, the mobile computer antenna is broadly divided into externally positioned type and internally-arranged type, the externally positioned type antenna can influence the moulded shortcoming that produces bending, fractures with having the foreign object of being subject to collision attractive in appearance of mobile computer, and built-in aerial has advantage in this respect.The internally-arranged type antenna roughly is divided into microstrip antenna, inverted F shaped antenna, slot antenna, flat helical antenna etc.Therefore characteristics such as volume is little because inverted F shaped antenna has, mechanism is simple, design is easy were used for mobile computer in recent years in a large number.A kind of typical traditional inverted F shaped antenna such as United States Patent (USP) announce the 6th, 600, and shown in No. 448, although this type of inverted F shaped antenna has above-mentioned advantage, it has single operational frequency bands function.Thereby range of application is narrow.

In order to overcome the above-mentioned shortcoming of traditional inverted F shaped antenna, a kind of double-frequency inverted F-type antenna is shown in No. the 563274th, Taiwan patent announcement.This antenna also has two working bands because of having two Departments of Radiation except that the advantage with above-mentioned traditional inverted F shaped antenna.Yet this double-frequency inverted F-type antenna also has weak point.Because the change of feedback point position, cause the input impedance and the operating frequency of antenna to change simultaneously, thereby this double-frequency inverted F-type antenna is difficult under the set operating frequency and reaches good impedance matching between the feed line, and impedance matching is one of most important factor for Antenna Design.Impedance does not match and will cause a part of feed-in energy to be reflected to signal source rather than to be transmitted into the space.This feed-in energy is big more to the reflection of signal source, and is just more little from the radiation in alignment space, sky, thereby reduced the gain of antenna.

[summary of the invention]

The purpose of this utility model is to provide simple, the easy for installation and input impedance of a kind of making to be easy to the multifrequency antenna of adjusting.

In order to obtain above-mentioned advantage and overcome shortcoming of the prior art, multifrequency antenna of the present utility model comprises first Department of Radiation, second Department of Radiation, connecting portion, grounding parts and is positioned at the fluting of the adjustable antenna input impedance on the grounding parts.The design of described first Department of Radiation and the second Department of Radiation one, and first Department of Radiation is low frequency radiation portion, second Department of Radiation is a high-frequency radiation part.The described situation decision of adjusting the fluting size of input impedance by the impedance matching of antenna and feeder line is introduced the slot antenna of adjusting input impedance and can be reached coupling rapidly, and very little to the influence of other parameter of antenna.

[brief description of drawingsfig]

Fig. 1 is the plane graph of the utility model.

Fig. 2 is the test record figure of the voltage standing wave ratio frequency function of the utility model.

Fig. 3 is the horizontal polarization electromagnetic radiation field pattern of the utility model when working in the 2.45GHz frequency.

Fig. 4 is the perpendicular polarization electromagnetic radiation field pattern of the utility model when working in the 2.45GHz frequency.

Fig. 5 is the horizontal polarization electromagnetic radiation field pattern of the utility model when working in the 5.2GHz frequency.

Fig. 6 is the perpendicular polarization electromagnetic radiation field pattern of the utility model when working in the 5.2GHz frequency.

Fig. 7 is the horizontal polarization electromagnetic radiation field pattern of the utility model when working in the 5.8GHz frequency.

Fig. 8 is the perpendicular polarization electromagnetic radiation field pattern of the utility model when working in the 58GHz frequency.

[embodiment]

See also shown in Figure 1ly, the utility model multifrequency antenna 1 comprises first Department of Radiation 10, second Department of Radiation 20, feed line 30, grounding parts 40 and connecting portion 50.Described first Department of Radiation 10, second Department of Radiation 20, grounding parts 40 and connecting portion 50 design for one and are in same plane, are all made by electric conducting material, for example copper.First Department of Radiation 10 and second Department of Radiation 20 are an integral planar structure, and first Department of Radiation 10 is positioned at the left side of integral planar structure, and second Department of Radiation 20 is positioned at integrally-built the right, and second Department of Radiation, 20 to the first Departments of Radiation 10 are short and wide.

Grounding parts 40 left-half are wideer than its right half part.Grounding parts 40 is provided with a fluting 101 that is used to adjust input impedance.The described fluting 101 that is used to adjust input impedance is positioned at grounding parts 40 near first Department of Radiation, 10 parts, and this fluting 101 is generally rectangle, and its size is determined by the input impedance of dual-band antenna 1.The characteristic impedance of general feeder is the pure resistance of 50 Ω, and the input impedance of antenna is because the position relation of feedback point is difficult to reach pure resistance, the utility model multifrequency antenna 1 set fluting 101 can provide a capacitive reactance component, can offset the induction reactance component of antenna feed impedance like this, making the reactive component in the input impedance of entire antenna is 0, thereby obtains the pure resistance component identical with the feeder line characteristic impedance.

Connecting portion 50 is the inverted "L" shaped shape, and the one end is connected with grounding parts 40 wider portion with second Department of Radiation perpendicular connection of 20 bottoms, the other end.

Feed line 30 is coaxial line cables, comprises an inner wire 301 and an outer conductor 302.Feed line 30 is affixed on the RHP surface of grounding parts 40, and its inner wire 301 is electrically connected at binding site 102 with connecting portion 50, and its outer conductor 302 is electrically connected at binding site 103 with grounding parts 40.First Department of Radiation 10 is used to launch low frequency signals, and second Department of Radiation 20 is used to launch higher frequency signals.

Fig. 2 is the voltage standing wave ratio test record figure of the utility model multifrequency antenna 1 frequency spectrum function.Antenna is in the 2.4G-2.5GHz frequency band as can be seen from kymogram, and voltage standing wave ratio is all less than " 2 ", and above-mentioned frequency band has provided the bandwidth up to 100MHz, and this bandwidth has comprised the wireless communication bandwidth based on IEEE802.11b/g and bluetooth.Antenna is in the 5G-6GHz frequency band, and also all less than " 2 ", this frequency band has provided the bandwidth up to 1G to voltage standing wave ratio, satisfies IEEE802.11a standard radio communication bandwidth (5.15-5.35GHz, 5.725-5.875GHz) fully.Horizontal polarization and the perpendicular polarization electromagnetic radiation field pattern of Fig. 3 when Fig. 8 has provided that multifrequency antenna 1 is operated in 2.4-2.5GHz, 5.15-5.35GHz, 5.725-5.875Ghz respectively, this radiation field pattern does not have tangible dead angle as can be seen, meets the practical application condition of antenna.

The fluting 101 that can adjust input impedance greatly facilitates the design of antenna, and makes the efficiency optimizationization of impedance matching.The size of described fluting 101 can select an optimum size to make the impedance matching of multifrequency antenna 1 reach best by the input impedance decision of antenna.

In other embodiments, first and second Departments of

Radiation

10,20 can have different sizes and rectangle other shape in addition.The fluting 101 that can adjust input impedance can be other shape beyond rectangle or the rectangle.

Claims

1. antenna, it comprises at least one first Department of Radiation, grounding parts, connecting portion and feed line, described connecting portion connects first Department of Radiation and grounding parts, described feed line comprises inner wire and outer conductor, inner wire and described connecting portion electrically connect, outer conductor and described grounding parts electrically connect, and it is characterized in that: described grounding parts is provided with a fluting, and it is used to adjust the impedance matching of antenna.

2. antenna as claimed in claim 1 is characterized in that: described antenna also comprises second Department of Radiation that is electrically connected with first Department of Radiation.

3. antenna as claimed in claim 1 is characterized in that: described fluting can be rectangle.

4. antenna as claimed in claim 3 is characterized in that: described fluting is located at grounding parts near the Department of Radiation part.

5 antennas as claimed in claim 1 is characterized in that: described first Department of Radiation, connecting portion, grounding parts are one-body molded, and are in same plane.

6. multifrequency antenna, it comprises: two Departments of Radiation are respectively low frequency radiation portion and high-frequency radiation part; Grounding parts is in same plane with described two Departments of Radiation; Connecting portion connects described two Departments of Radiation and grounding parts; Feed line comprises inner wire that is connected with connecting portion and the outer conductor that is connected with grounding parts; It is characterized in that: described grounding parts is provided with fluting, and this fluting is used to adjust the impedance matching of antenna.

7. multifrequency antenna as claimed in claim 6 is characterized in that: described fluting is located at grounding parts near the Department of Radiation part.

8. multifrequency antenna as claimed in claim 6 is characterized in that: described low frequency radiation portion is than high frequency radiation minister and narrow.