CN204668466U - Antenna structure - Google Patents

Abstract

An antenna structure for receiving a feed signal. The antenna structure includes a main radiator, a signal feed portion, and two auxiliary antenna modules. The main radiator is covered on a rectangular dielectric substrate, and includes two coupled radiating portions that are mirror-symmetrical to an axis, and a hollow portion formed by the coupled radiating portions. Each coupled radiating portion has a hypotenuse oblique to the axis, a feed end located at one end of the hypotenuse and adjacent to the axis, and at least one signal contact away from the axis. The signal feed portion is covered on the hollow portion and adjacent to the feed end. The auxiliary antenna modules are respectively installed at the signal contacts of each coupled radiating portion to increase the gain value of the feed signal. The utility model has the effects of improving the reception efficiency of digital television signals and miniaturizing the signal.

Description

antenna structure

technical field

The utility model relates to an antenna structure, in particular to an antenna structure for receiving digital television signals.

Background technique

In recent years, many countries have actively promoted the digitalization of TV to reduce the waste of channel resources and improve the transmission quality of audio and video signals. Among them, the antenna device used to receive the digital radio wave sent by the wireless TV station is an important intermediary component between the audio-visual device and the propagation environment. It not only needs to convert the electrical signal and the electromagnetic field signal, but also must use its body structure to reduce the specific bandwidth. The attenuation loss rate of the electromagnetic wave to improve the signal-to-noise ratio (Signal-to-Noise Ratio, SNR) of the received signal.

However, in existing antenna devices, an antenna belonging to a dipole antenna as shown in FIG. 1 is common. The structure of this antenna comprises two monopole antennas 5, and each monopole antenna 5 forms a meander line (Meander Line) pattern with a twisted metal plate, and includes a low-frequency radiation band 51, and a high-frequency radiation band 51. Frequency radiation band 52. The antenna device receives the signal attenuation rate of the frequency band between 174MHz and 700MHz by means of the low and high frequency radiation bands 51, 52 - represented by the dotted line in Fig. 4 - it can be seen that the antenna device is used in the digital TV commonly used at present The performance of the signal attenuation rate in the frequency band—470MHz to 600MHz—needs to be further improved. In addition, since the low-frequency radiation band 51 and the high-frequency radiation band 52 of each monopole antenna 5 are continuous meandering joints, the electromagnetic field generated by the current in the lateral portion produces a counteracting effect, and the effective current path must exceed four Only a fraction of a wavelength can resonate to a specific frequency band, which not only increases the length of the antenna device, but also increases the manufacturing cost.

Contents of the invention

The purpose of the utility model is to provide an antenna structure which can improve the receiving efficiency of digital TV signals and can be miniaturized.

The antenna structure of the utility model is used for receiving a feed-in signal. The antenna structure includes a main radiator, a signal feeding part, and two auxiliary antenna modules.

The main radiating body is covered on a rectangular dielectric substrate, and includes two coupling radiating parts which are respectively mirrored and symmetrical to an axis, and a hollow part surrounded by the coupling radiating parts. Each coupling radiation part has a hypotenuse inclined to the axis, a feed-in end located at one end of the hypotenuse and adjacent to the axis, and at least one signal contact far away from the axis.

The signal feed-in part covers the hollow part and is adjacent to the feed-in end.

The secondary antenna modules are respectively installed on the signal joints of each coupling and radiating part to increase the gain value of the fed-in signal.

Preferably, each coupling radiating part also has a base line perpendicular to the axis and away from the feed-in end, the base lines are connected to each other, and surround the hollow part in the form of an isosceles triangle with the hypotenuse.

Preferably, each coupling radiating part also has a base line perpendicular to the axis and away from the feeding end, and an adjoining line connecting the hypotenuse and the base line, the base lines are connected to each other and connected to the hypotenuse, The adjoining lines surround the pentagonal hollow portion.

Preferably, each coupling radiation part further has a polygonal area and a connection area, the hypotenuse and the feed-in end are formed in the polygonal area, and the signal contact is formed in the connection area.

Preferably, the polygonal area is not connected to the connecting area, and the polygonal area and the connecting area respectively form a connecting bump.

Preferably, each coupling radiation part has a plurality of signal contacts, and each auxiliary antenna module includes a plurality of auxiliary antenna elements, and the auxiliary antenna elements are correspondingly installed on the signal contacts.

Preferably, each coupling radiating part has two signal contacts, and each secondary antenna module has two sub-antenna elements, and the signal contacts are respectively adjacent to four corners of the dielectric substrate.

The beneficial effect of the utility model is that: by virtue of the geometric structure etched on the dielectric substrate and the cooperation with the sub-antenna module, the efficiency of receiving digital TV signals and the miniaturization of the antenna can be achieved.

Description of drawings

Other features and effects of the present utility model will be clearly presented in the implementation manner with reference to the drawings, wherein:

Fig. 1 is a schematic diagram illustrating the structure of an existing antenna;

Fig. 2 is a schematic diagram illustrating a first embodiment of the utility model antenna structure;

Fig. 3 is a schematic diagram illustrating a second embodiment of the utility model antenna structure;

FIG. 4 is a comparison diagram of antenna gain, comparing the signal attenuation rate of the conventional antenna and the first embodiment in the frequency band between 174MHz and 700MHz.

Detailed ways

Before the present invention is described in detail, it should be noted that in the following description, similar components are denoted by the same numerals.

Referring to FIG. 2 , a first embodiment of the antenna structure of the present invention is used to receive a feed-in signal, and includes a main radiator 1 , a signal feed-in part 2 , and two auxiliary antenna modules 3 .

The main radiator 1 is covered on a rectangular dielectric substrate 4 , and includes two coupling radiating portions 11 mirror-image-symmetrical to an axis L and a hollow portion 12 . Each coupling radiation part 11 has a polygonal area 111, a connecting area 112, a hypotenuse 113 oblique to the axis L, a feeding end 114 located at one end of the hypotenuse 113 and adjacent to the axis L, a plurality of The signal contact 115 away from the axis L, and a base line 116 perpendicular to the axis L and away from the feeding end 114 . Wherein, the hypotenuse 113 and the feed-in terminal 114 are formed in the polygonal area 111 , and the signal contact 115 is formed in the connecting area 112 . The base lines 116 of the two coupling radiation parts 11 are connected to each other on the same straight line, and surround the hollow part 12 in the form of an isosceles triangle with the hypotenuse 113 . In this embodiment, the number of signal contacts 115 of each coupling radiation part 11 is two, and they are respectively adjacent to the corners of the dielectric substrate 4, that is, the four signal contacts 115 are respectively adjacent to the four corners of the dielectric substrate 4. top angle. In addition, the polygonal area 111 forms a connection bump 118 , and the connection area 112 forms a connection bump 119 . It should be noted that the dielectric substrate 4 is generally made of glass fiber board, or insulating material such as bakelite board that can be plated with metal conductors such as copper foil. The main radiator 1 and the signal feeding part 2 are formed by the geometric structure etched on the dielectric substrate 4 .

The signal feeding part 2 covers the hollow part 12 and is adjacent to the feeding end 114 . It is worth mentioning that the geometric structure of the signal feed-in part 2 is used to provide a plurality of impedance components mounted on it to form a circuit wire loop, and the impedance components must be matched with the feed-in signal to be received, so as to achieve the best reception quality. However, this part is not the key point of the present utility model, so it is not repeated here.

The secondary antenna modules 3 respectively include a plurality of secondary antenna elements 31 . In this embodiment, the number of the auxiliary antenna elements 31 of each auxiliary antenna module 3 corresponds to the number of the signal contacts 115, and the number is two, so that the auxiliary antenna elements 31 can be respectively installed on the The signal contact 115 . Wherein, each sub-antenna element 31 is a telescopic antenna rod, but it can also be a flexible receiving line, so that it can be easily retracted and its overall volume can be reduced, and the gain value of the fed signal can be increased. It should be noted that the number of signal contacts 115 of each coupling radiation portion 11 can be adjusted according to design requirements, for example, one or three, and only the number of sub-antenna elements 31 needs to be adjusted accordingly.

In this way, each coupling radiation part 11 will generate a magnetic field current after receiving the feed-in signal, and the current will be extended by the radiation conductor of the polygonal area 111, and the electric field generated by the current will couple with each other to form an overall capacitor. It should be noted that the distribution of the current on the polygonal area 111 is uneven, and the narrower the area—such as the baseline 116—the greater the current flowing through, so the generated equivalent capacitance is larger; However, the area with larger area—for example, the blocks on both sides of the hollow portion 12—flows smaller current, so the generated equivalent capacitance is smaller. Therefore, each coupling radiation part 11 can be regarded as the overall capacitance formed by a plurality of capacitors connected in parallel. In addition, after the secondary antenna element 31 receives the feed-in signal, it will also generate a magnetic field current due to the resonance effect, and the current is transmitted through an inductor (not shown) installed between the connecting bumps 118 and 119. into the polygonal region 111, thus obtaining an equivalent circuit in which the inductor (not shown) is connected in series with the overall capacitor. Finally, the current is introduced into the signal feeding part 2 from the feeding end 114 through another inductor (not shown), and the action of receiving the feeding signal is completed. So, in the formula From the relationship shown, it can be seen that in the equivalent circuit of the electric wave transmission, the inductance value L and the capacitance value C determine the phase velocity V _p of the electric wave transmission, and at the same resonance frequency f, the resonance wavelength λ will be affected by the phase velocity V _p becomes smaller and shorter, so that the length of the antenna can be shortened to achieve the purpose of reducing the size. In addition, through experimental verification, the signal attenuation rate of the antenna structure of the present invention in the frequency band between 174MHz and 700MHz is shown by the solid line in Figure 4, and compared with the existing antenna—shown by the dotted line. Among them, in the commonly used digital TV frequency band of 470MHz to 600MHz, the performance of the signal attenuation rate of the utility model is indeed improved, which means that better receiving quality can be obtained. Moreover, the signal attenuation rate of the utility model belonging to the very high frequency (VHF) frequency band between 174MHz and 230MHz is very small, so it is also suitable for receiving signals from short-distance transmission media such as broadcasting stations or radio channels.

However, in the first embodiment, the inductance is used to match the antenna impedance, but according to the circuit principle, the configuration of the inductance can be replaced by the shape of the radiation conductor in the polygonal area 111 . Therefore, referring to FIG. 3 , it is a second embodiment of the antenna structure of the present invention, which includes a main radiator 6 , a signal feeding part 2 , and two auxiliary antenna modules 3 .

The main radiator 6 is covered on a rectangular dielectric substrate 4 , and includes two coupling radiation portions 61 mirror-image-symmetrical to an axis L and a hollow portion 62 . Each coupling radiation part 61 has a polygonal area 111, a connecting area 112, a hypotenuse 113 oblique to the axis L, a feeding end 114 located at one end of the hypotenuse 113 and adjacent to the axis L, a plurality of The signal contact 115 away from the axis L, a base line 116 perpendicular to the axis L and away from the feeding end 114 , and an adjacent line 117 connecting the hypotenuse 113 and the base line 116 . Wherein, the hypotenuse 113 , the feed-in terminal 114 , the base line 116 and the adjacent line 117 are formed in the polygonal area 111 , and the signal contact 115 is formed in the connection area 112 . The base lines 116 are connected to each other, and surround the pentagonal hollow portion 62 with the hypotenuse 113 and the adjacent line 117 . In this embodiment, the number of signal contacts 115 of each coupling radiation portion 61 is two, and they are respectively adjacent to the corners of the dielectric substrate 4 .

Wherein, the signal feeding part 2 and the secondary antenna module 3 are the same as those of the first embodiment, therefore, the related structures of the signal feeding part 2 and the secondary antenna module 3 will not be repeated.

In this way, each coupling radiation part 61 can be regarded as the overall capacitance formed by parallel connection of multiple capacitors, and by changing the length of the adjacent line 117, the overall capacitance of each coupling radiation part 61 can be adjusted to perform impedance matching , so as to replace the inductance setting in the first embodiment, and reduce the setting of circuit components, so as to reduce the manufacturing cost.

To sum up, the antenna structure of the present invention can not only improve the receiving performance of digital TV signals by virtue of the geometric structure etched on the dielectric substrate 4 and cooperate with the auxiliary antenna module 3, but also utilize the The slow wave effect caused by equivalent capacitance and inductance can shorten the overall length of the antenna and make the antenna miniaturized. In addition, it can be seen from experiments that this geometric structure is also suitable for receiving signals from short-distance transmission media such as broadcasting stations or radio channels, so the purpose of the utility model can indeed be achieved.

What is described above is only the embodiment of the utility model, and should not limit the scope of implementation of the utility model, that is, all simple equivalent changes and modifications made according to the claims of the utility model and the contents of the description are all Still belong to the scope of the present utility model.

Claims (7)

1. an antenna structure, for receiving a FD feed, is characterized in that: shouldAntenna structure comprises:

A main radiator, covers on a rectangular dielectric substrate, and comprises twoBe symmetrical in the coupled radiation portion of an axis, and one by described coupling spoke individual mirror image respectivelyPenetrate portion around form hollow part, each coupled radiation portion have one oblique in this axisHypotenuse, one be positioned at this hypotenuse one end, and the feed side of contiguous this axis, and at least oneThe individual signal contact away from this axis;

A signal feed-in part, covers in this hollow part, and contiguous this feed side; And

Two slave antenna modules, are installed on respectively the signal contact in each coupled radiation portion.

2. antenna structure according to claim 1, is characterized in that: each couplingDepartment of Radiation also has vertical this axis, and away from the baseline of this feed side, described baselineBe connected to each other, and with described hypotenuse around this hollow part in isosceles triangle.

3. antenna structure according to claim 1, is characterized in that: each couplingDepartment of Radiation also has vertical this axis, and away from the baseline of this feed side, and a companyConnect the abutment line of this hypotenuse and this baseline, described baseline is connected to each other, and with described hypotenuse,Described abutment line is around in pentagonal this hollow part.

4. antenna structure according to claim 1, is characterized in that: each couplingDepartment of Radiation also has a polygon district, and a bonding pad, this hypotenuse and this feed side shapeBe formed in this polygon district, this signal contact is formed at this bonding pad.

5. antenna structure according to claim 4, is characterized in that: this polygon districtBe not connected with this bonding pad, this polygon district and this bonding pad form respectively a connecting salient points.

6. the antenna structure according to claim 4 or 5, is characterized in that: eachCoupled radiation portion has multiple signal contacts, and each slave antenna module comprises multiple slave antennasPart, described slave antenna part is installed on respectively described signal contact accordingly.

7. antenna structure according to claim 6, is characterized in that: each couplingThe quantity that Department of Radiation has signal contact is two, the slave antenna part of each slave antenna moduleQuantity be two, described signal contact is respectively adjacent to four drift angles in this dielectric substrate.