CN2511013Y

CN2511013Y - Concealed multi-frequency antenna for mobile phones

Info

Publication number: CN2511013Y
Application number: CN 01259469
Authority: CN
Inventors: 陈一锋
Original assignee: YAODENG SCIENCE AND TECHONLOGY CO Ltd
Current assignee: YAODENG SCIENCE AND TECHONLOGY CO Ltd
Priority date: 2001-08-27
Filing date: 2001-08-27
Publication date: 2002-09-11
Anticipated expiration: 2011-08-27

Abstract

Disclosed is a hidden type multi-frequency antenna for the mobile phone, the front of a circuit board is provided with two divided grounding areas and a supplying wire of a one-fourths wavelength monopole antenna. The open-circuit end of the supplying wire is provided with an antenna loading to form a coplanar waveguide antenna. Combined with another grounding area of the back of the circuit board the front supplying wire is provided with another short-circuit part whose resonance frequency can be adjusted to form a reversed F-shaped wire which shares a combined type plane with the coplanar waveguide antenna. And thus the hidden type multi-frequency antenna whose frequency band, radiative efficiency and gain can be improved can be composed due to the plane and the miniaturization.

Description

The concealed multifrequency antenna of mobile phone

Technical field

The relevant a kind of antenna of the utility model, the concealed multifrequency antenna of particularly a kind of mobile phone.

Background technology

Mobile phone is asked city's initial stage, mostly with the helical structure coil that the exposes main element as antenna.Now the institute widely used this type of coil antenna in, it is broadly divided into telescopic and fixed two kinds of main kenels.Though but use which kind of structure, it still contains with length-specific outstanding by the body end face of mobile phone under normal conditions.This kind conventional coil antenna more and more can't adapt to the design requirement of miniaturization mobile phone, has various microplate antennas to produce for this reason.Use the microplate antenna owing to have complanation, do not account for the characteristic of volume, the trend that becomes miniaturization mobile phone antenna main product is gradually arranged.

Early stage microplate antenna, as be disclosed in No. the 3921177th, United States Patent (USP) and No. 3810183 is normally formed with circle or rectangle foil, fill dielectric material between itself and ground connection, but this type of microplate antenna is only allowed narrower frequency range.Taiwan patent No. 81108896 (No. 07/798700, Application No.) then provides a kind of and has dwindled and be the microplate antenna of wideband.But its shortcoming then is to make the helical antenna element be located at the ground plate of separation, and therebetween is provided with specific thicknesses dielectric and support materials, and the entire antenna size still is difficult to further dwindle.

And modern age is with plane inverse F type circuit (Planar Inverted-F Antenna, PIFA), to constitute double frequency (Dual Frequency) antenna (IEEE TRANSACTIONS ON ANTENNAS ANDPROPAGATION, VOL 45, NO.10, OCTOBER 1997), then be a kind of desirable Miniaturized Microstrip Antennas pattern, but because:

Therefore as long as with antenna planeization, miniaturization, its frequency bandwidth and radiation efficiency all can reduce, and necessity of being improved is arranged.

Summary of the invention

Technical problem to be solved in the utility model, promptly at the above-mentioned deficiency of prior art, and provide a kind of mobile phone concealed multifrequency antenna, the concealed multifrequency antenna of this mobile phone be co-plane waveguide antenna (CPW, coplaner waveguide) and planar inverted F-shape antenna (PIFA) the common small planar multifrequency antenna that constitutes.

Above-mentioned technical problem of the present utility model is realized by following technical scheme.

The concealed multifrequency antenna of a kind of mobile phone is characterized in that: be provided with two access areas that separate in the front of a circuit board, and the supply lines of one 1/4 wavelength unipole antennas, this supply lines gives antenna in open end and loads; Another access area that cooperates foregoing circuit backboard face then is provided with another flattening that can adjust resonance frequency bending short circuit part in above-mentioned front supply lines.

Except that above-mentioned essential features, in specific implementation process, also can replenish following technology contents:

This supply lines open end is loaded as a del.

The concealed multifrequency antenna of mobile phone of the present utility model, 1/4 wavelength (λ) unipole antenna of shortening is adopted by its supply line, be designed to del in its open end, to obtain higher gain, simultaneously for 1/4 wavelength unipole antenna flattening and obtain required impedance matching, one short-circuit line is set near its supply terminals, this short circuit part is as capacitive-loaded, can utilize its change in location to reach the multifrequency effect to adjust resonance frequency, thereby form a kind of co-plane waveguide antenna (CPW, coplaner waveguide) and planar inverted F-shape antenna (PIFA) the common small planar multifrequency antenna that constitutes.

Advantage of the present utility model is: utilize the short-circuit line change in location to reach the multifrequency effect to adjust resonance frequency, and can constitute a concealed multifrequency antenna that can improve its frequency band, radiation efficiency and gain under plane, miniaturization.

Novelty of the present utility model and other characteristics will be tending towards clear in the detailed description that cooperates the following drawings and preferred embodiment,

Description of drawings

Fig. 1 is the utility model preferred embodiment front perspective view.

Fig. 2 is the back of the body parallax stereogram of Fig. 1.

Fig. 3 is the utility model voltage standing wave ratio (V.S.W.R) test resolution.

Fig. 4 is the electromagnetic radiation field pattern that the utility model is used in 900MHz.

Fig. 5 is the electromagnetic radiation field pattern that the utility model is used in 800MHz.And

Fig. 6 is the electromagnetic radiation field pattern that the utility model is used in 1900MHz.

Embodiment

At first please join Fig. 1,2, be example with illustrated circuit board 10, and in feasible embodiment, its length L is 3.25 centimeters, and width W is 2.0 centimeters, and its thickness T (i.e. height) is 0.25 centimeter.On diagrammatic sketch and indicated X, Y, Z three axis of orientations, be the XY-plane for the H plane (H-plane) of the electromagnetic radiation field pattern of presentation graphs 4 to Fig. 6, E plane (E-plane) then is the XZ plane.

In the diagram preferred embodiment, circuit board 10 fronts are provided with the two access area II, 12 that separate, its width is about 1/16 wavelength (λ), and in the supply lines 13 that is provided with 1/4 wavelength unipole antenna between the two, this supply lines 13 adopts the antenna load mode in its open end, and it is designed its del 14.Above-mentioned supply lines 13 thereby can form a supply terminals 15 in its ora terminalis.Cooperate this supply lines 13, open end to load and access area, both

sides

11,12 with common formation one co-plane waveguide antenna (CPW, coplanerwaveguide), to form the general higher gain (GAIN) of microstrip antenna.

Can establish an access area 16 in the back side in addition according to above-mentioned electric network plate 10, it then can be provided with short circuit part 17 with the unipole antenna flattening at front supply lines 13 near supply terminals 15, to form the structure of an inverted F shaped antenna (PIFA).This short circuit part 17 is as capacitive-loaded, and the variation that can utilize its position to be adjusting resonance frequency, and reaches different Frequency points.

The acting in conjunction of above-mentioned co-plane waveguide and plane inverse F type can improve its bandwidth, radiation efficiency and gain in the complanation of this kind concealed antenna, miniaturization.

Now please join Fig. 3, the utility model is according to the said structure antenna, when verifying with net analysis instrument HP8714ET type instrument, its in the voltage standing wave ratio (V.S.W.R) of 890MHz (the 1st point), 960MHz (the 2nd point), 1710MHz (the 3rd point) and 2055MHz (the 4th point) all less than 2, quite desirable.

Simultaneously, on antenna gain, according to Fig. 4 shown in the electromagnetic radiation field pattern shown in Figure 6: 900MHz is 0.23dBi, and 1800MHz is 2.18dBi, and 1900MHz is 3.22dBi, and its data value all is positioned within the standard gauge scale value.

The utility model provides the concealed multifrequency antenna of a kind of plane, miniaturization, really belongs to innovation and has value on the industry, and mere formality proposes novel patent application in accordance with the law.

Claims

1, the concealed multifrequency antenna of a kind of mobile phone is characterized in that: be provided with two access areas that separate in the front of a circuit board, and the supply lines of one 1/4 wavelength unipole antennas, this supply lines gives antenna in open end and loads; Another access area that cooperates foregoing circuit backboard face then is provided with another flattening that can adjust resonance frequency bending short circuit part in above-mentioned front supply lines.

2, according to the concealed multifrequency antenna of the described mobile phone of claim 1, it is characterized in that: this supply lines open end is loaded as a del.