CN2159069Y

CN2159069Y - Pocket flat antenna

Info

Publication number: CN2159069Y
Application number: CN 93200831
Authority: CN
Inventors: 蔡茂
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-01-09
Filing date: 1993-01-09
Publication date: 1994-03-16
Anticipated expiration: 2003-01-09

Abstract

The utility model discloses a pocket flat antenna, comprising an insulation basal plate 1 and a conductive pattern 2 manufactured on the insulation basal plate. The conductive pattern comprises a central region 21 and a surrounding annulus band 22. The central region 21 can be the arbitrary shape; the annulus band 22 can encircle the central region 21; a continuous uniform gap 3 is arranged between the central region 21 and the annulus band 22; the length of the gap is approximately equal to one-second lambda of the wave length of the half wave. The surface of the utility model is provided with the insulation basal plate 1 of the conductive pattern 2 and the insulation basal plate 1 is a printed circuit board (PCB). The printed circuit board (PCB) comprises the central region 21 and the conductive pattern 2 of the surrounding annular band 22. The conductive pattern 2 is a layer of metal film. The utility model has the advantage that the antenna area is remarkably reduced so that the utility model is especially suitable for the car and the mobile phone. The utility model can be used for receiving the satellite TV program and stopping the ground microwaves.

Description

Pocket flat antenna

The utility model relates to flat plane antenna, particularly relates to the Pocket flat antenna with annular slot.

The wire of prior art and flat plane antenna have only when its a certain direction length to equal half-wavelength (1/2 λ), when resonating with electromagnetic wave, receive and launching effect the best.And frequency of utilization is in case determine that antenna size is also just determined in view of the above.The frequency of using in view of present mobile communication and television broadcasting is not really high, thereby antenna size is bigger, and this is inconvenient in many use occasions.Along with the VLSI(very lagre scale integrated circuit (VLSIC)) development of technology, it is more and more littler that nearly all electronic circuit product has all become, the thing that the antenna assembly miniaturization that is used with it is just extremely urgent naturally.

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and a kind of Pocket flat antenna is provided, and its area only reaches some/one of prior art antenna, can be installed in car crust or house sidings surface, or is attached on the window.

The purpose of this utility model can reach by following measure: make a kind of Pocket flat antenna, comprise insulated substrate and be produced on conductive pattern above it, the latter comprises central area and endless belt on every side again.Central area can be an arbitrary shape, and endless belt has a continuous even slit between the two around it, and length is substantially equal to half-wave wavelength (1/2 λ).

The drawing of accompanying drawing is described as follows:

Fig. 1 is the utility model antenna structure shape schematic diagram;

Fig. 2 is that the utility model is the conductive pattern and the dimensional drawing of a most preferred embodiment antenna of 900 megahertz frequency ranges design;

Fig. 3 is mismatch attenuation (return loss) curve of Fig. 2 most preferred embodiment antenna;

Fig. 4 is the antenna pattern of Fig. 2 most preferred embodiment antenna, and 10 decibels/lattice, the value during by 900 megahertzes is that maximum is drawn.

Be described in further detail with regard to a most preferred embodiment of the present utility model below in conjunction with accompanying drawing.

The utility model antenna as shown in Figure 1, comprises insulated substrate 1 and is produced on conductive pattern 2 above it, and the latter comprises central area 21 and endless belt 22 on every side again.Central area 21 can be an arbitrary shape, can be designed to different shapes such as rectangle, circle, triangle, star, rhombus.Endless belt 22 is around it, and the two has a continuous even slit 3, and length is substantially equal to half-wave wavelength (1/2 λ).The central area 21 and center conductor and the outer conductor of the same respectively connector of endless belt 22 (feeder line) are connected on every side.Energy of electromagnetic field mainly concentrates in the slit 3, feeds or draws by described connector (feeder line).

That the insulated substrate 1 that the surface is manufactured with conductive pattern 2 is in fact commonly used is a kind of printed circuit board (PCB) (PCB), comprise central area 21 and on every side the conductive pattern 2 of endless belt 22 are layer of metal films.The length of annular slot 3 is exactly the Zhou Bianchang 1 of central area 21 basically, the work ratio f of its decision antenna.Present 1 ≈, 1/2 λ enters resonance state, just can transmit and receive signal effectively.Because be circumferential direction resonance at metal film, thereby wire and flat plane antenna resonate in a certain direction length compared to existing technology, area reduces greatly, but also can adjust the bandwidth W and the gap width S of endless belt 22 on every side, see Fig. 2, the utility model antenna feed impedance is changed, realize the best power conversion.In addition, central area 21 and on every side endless belt 22 can be produced on the same one side of substrate 1, also can be produced in the two sides of this substrate, to adapt to different purposes and to cooperate the connector (feeder line) of different types.

The utility model especially is suitable as the FM broadcasting and the television receiving antenna of VHF, uhf band, as the antenna of 900 and 1800 megahertz frequency range mobile phones and automobile telephone, and the stellar-based global-positioning system that is used for 1500 megahertzes.Can also utilize antenna of the present utility model as the basic comprising element, the composition area is little, the array antenna of high directivity, is used to receive satellite television and makes terrestrial microwave relaying purposes.

Fig. 2 is that the utility model is the conductive pattern and the dimensional drawing of a most preferred embodiment antenna of 900 megahertz frequency ranges design.See together in conjunction with Fig. 1 and Fig. 2, wherein insulated substrate 1 can, for example be the PC(Merlon of thickness δ=0.38 millimeter, relative dielectric constant ε r=2.5) plate, in the conductive pattern 2, central area 21 is a rectangle, endless belt 22 bandwidth W=71 millimeters on every side, long L=45 millimeter, area only are to be operated in 1/8th of prior art microstrip antenna under the same frequency.The bandwidth Wt=4 millimeter of endless belt 22, the width S in slit 3=1.5 millimeter.W/L=1.76 is in OK range.This ratio too conference causes the narrow high Q(quality of frequency band) factor, the too little radiation efficiency that then causes reduces.The length 1=188 millimeter in slit 3, half-wavelength 1/2 λ when being equivalent to the f=800 megahertz.Most preferred embodiment of the present utility model is seen Fig. 2, the central area 21 of its conductive pattern 2 and on every side endless belt 22 be produced on the same one side of insulated substrate 1, be the co-planar waveguide antenna, use the coaxial cable feed signal.Pei Zhi a advantage is like this, can be easy to some active devices, and for example some diode, field-effect transistor and HEMT etc. are adaptive, and needn't need run through substrate as the situation of microstrip antenna.

Fig. 3 is mismatch attenuation (return loss) curve of Fig. 2 antenna, is less than or equal to-10 decibels of definition with return loss.This curve display frequency bandwidth is from 934 megahertz to 1170 megahertzes, and relative bandwidth reaches 22%.In other words, in 900--1150 megahertz frequency range, reflection power seldom, thereby the utility model antenna effect is fine.Compare the microstrip antenna that is operated on the same frequency, the latter's band width only 5%.

Fig. 4 provides the utility model most preferred embodiment, i.e. the antenna pattern of Fig. 2 antenna.Wherein Fig. 4-1 is at 850 mhz frequencys, and Fig. 4-2 is at 900 mhz frequencys, and Fig. 4-3 is 950 megahertzes.Pocket flat antenna directivity of the present utility model changes slowly, gets maximum at above-below direction.The gain of the utility model antenna and common half-wavelength wire antenna are suitable, and area is little a lot, are well suited for using on moving bodys such as automobile, can also be with the personal handyphone installation that combines together.

Compare with prior art, the major advantage of the utility model antenna is, area significantly reduces, and working band is widened, and cost is easy to use.

Claims

1, a kind of Pocket flat antenna, comprise insulated substrate 1 and the conductive pattern 2 that is produced on above it, it is characterized in that: conductive pattern 2 comprises central area 21 and endless belt 22 on every side, and the two has a continuous even slit 3, and its length is substantially equal to half-wave wavelength (1/2 λ).

2, according to the described Pocket flat antenna of claim 1, it is characterized in that: central area 21 can be designed to rectangle, circle, triangle, star, rhombus.

3, according to the described Pocket flat antenna of claim 1, it is characterized in that: the insulated substrate 1 that the surface is manufactured with conductive pattern 2 is a kind of printed circuit board (PCB) (PCB), comprise central area 21 and on every side the conductive pattern 2 of endless belt 22 are layer of metal films.

4, according to the described Pocket flat antenna of claim 1, it is characterized in that: central area 21 and on every side endless belt 22 can be produced on the same one side of substrate 1, the two sides that also can be produced in this substrate is to cooperate the connector (feeder line) of different types.

5, according to the described Pocket flat antenna of claim 1, it is characterized in that: described antenna can be used as the basic comprising element, forms array antenna.