CN102801934A - Vehicle-mounted China mobile multimedia broadcasting (CMMB) terminal - Google Patents
Vehicle-mounted China mobile multimedia broadcasting (CMMB) terminal Download PDFInfo
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- CN102801934A CN102801934A CN2011101811537A CN201110181153A CN102801934A CN 102801934 A CN102801934 A CN 102801934A CN 2011101811537 A CN2011101811537 A CN 2011101811537A CN 201110181153 A CN201110181153 A CN 201110181153A CN 102801934 A CN102801934 A CN 102801934A
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Abstract
The invention relates to a vehicle-mounted China mobile multimedia broadcasting (CMMB) terminal, which comprises a receiving unit, a processing unit and at least one antenna, wherein the receiving unit is used for demodulating a digital television radio frequency signal and outputting audio and video data streams; the processing unit is used for decoding the audio and video data streams output by the receiving unit and outputting corresponding audio and video signals; the antenna is connected with the receiving unit and comprises a feeder line and a sheet metal; the feeder line is fed into the sheet metal through a coupling mode; and at least a first micro channel structure and a second micro channel structure which are asymmetrical are engraved on the sheet metal, so that the antenna has at least two different resonance frequency bands. Therefore, the attractive appearance of the vehicle-mounted CMMB terminal is improved, and the user experience is improved.
Description
Technical field
The invention belongs to multimedia technology field, particularly, relate to a kind of vehicle-mounted CMMB terminal.
Background technology
CMMB (China Mobile Multimedia Broadcasting; China Mobile multimedia broadcasting) system is to utilize high-power S-band satellite-signal to cover the whole nation; Utilize ground supplement translator to cover the satellite-signal blind area with mending point with content repeater satellite signal simultaneously frequently; Utilize mobile radio networks to make up return path, thus the mobile media broadcasting network that composition One-to-All Broadcast and two-way interactive combine.The ground launching centre is sent out signal behind the S-band synchronous satellite; Synchronous satellite is transmitted to the received signal; S-band signal after the forwarding is directly received by the receiving terminal on ground, also can handle the back through supplement translator and received by the receiving terminal on ground.This satellite also sends to supplement translator through distribution channels with signal and handles, and handles the back through supplement translator and transmits, and the shadow region that satellite covers is augmented.
In the prior art, CMMB also has application very widely at the back dress and the preceding assembling system of automobile.Vehicle-mounted CMMB device mainly comprises: receiving element links to each other the DTV radiofrequency signal that the demodulation car antenna obtains, the sound, the video data stream that comprise in the output DTV radiofrequency signal with external car antenna; Processing unit is decoded to sound, video data stream that receiving element is exported, and exports corresponding sound, vision signal; Broadcast unit receives sound, vision signal that processing unit is exported, output respective digital sound of television and picture.
The inventor finds that in to prior art research and practice process existing vehicle-mounted CMMB device antenna mainly adopts the telescopic antenna of external, reduces aesthetics, and trouble is installed, and influences user experience.
Summary of the invention
The technical problem that the present invention will solve is, a kind of vehicle-mounted CMMB is provided the terminal, can antenna be built in the CMMB terminal, thereby strengthen aesthetics, improves user experience.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of vehicle-mounted CMMB terminal comprises being used for demodulation DTV radiofrequency signal the receiving element of output sound, video data stream; Sound, video data stream to receiving element output are decoded, and export corresponding sound, Video signal processing unit; Also comprise the asymmetrical antenna that at least one is connected with said receiving element; This asymmetrical antenna comprises feeder line, sheet metal; Said feeder line is through the said sheet metal of coupled modes feed-in; At least engrave asymmetrical first micro groove structure and second micro groove structure on the said sheet metal, made said antenna have at least two different resonance band.
Technical scheme of the present invention is built-in with antenna, thereby strengthens aesthetics, improves user experience.In addition,, on sheet metal, engraved asymmetric first micro groove structure and second micro groove structure at least, therefore can produce a plurality of resonance points at an easy rate according to asymmetrical antenna of the present invention, and the difficult counteracting of resonance point, be easy to realize multimode resonance.
Description of drawings
Fig. 1 is an asymmetrical antenna structural representation of the present invention;
Fig. 2 is the asymmetrical antenna first preferred embodiments front view of the present invention;
Fig. 3 is the asymmetrical antenna second preferred embodiments front view of the present invention;
Fig. 4 is asymmetrical antenna the 3rd a preferred embodiments front view of the present invention.
Fig. 5 a is the sketch map of complementary split ring resonator structure;
Fig. 5 b is depicted as the sketch map of complementary helix structure;
Fig. 5 c is depicted as the sketch map of opening helical ring structure;
Fig. 5 d is depicted as the sketch map of two opening helical ring structures;
Fig. 5 e is depicted as the sketch map of complementary folding line structure;
Fig. 6 a is the sketch map of deriving of complementary its geometry of split ring resonator structure shown in Fig. 5 a;
Fig. 6 b is the sketch map of deriving of complementary its expansion of split ring resonator structure shown in Fig. 5 a;
Fig. 7 a is the structural representation behind the complementary split ring resonator structure shown in three Fig. 5 a compound;
Fig. 7 b is the compound sketch map that the complementary split ring resonator structure shown in two Fig. 5 a and Fig. 5 b are depicted as complementary helix structure;
Fig. 8 is the structural representation after the complementary split ring resonator structural group battle array shown in four Fig. 5 a.
Embodiment
A kind of vehicle-mounted CMMB terminal that the embodiment of the invention provides comprises being used for demodulation DTV radiofrequency signal, the receiving element of output sound, video data stream; Sound, video data stream to receiving element output are decoded, and export corresponding sound, Video signal processing unit; And at least one antenna that is connected with receiving element.The vehicle-mounted CMMB terminal that the embodiment of the invention provides through built-in or external broadcast unit, receives sound, the vision signal of processing unit output, output respective digital sound of television and picture.
The antenna that the embodiment of the invention provides is as shown in Figure 1, and Fig. 1 is an asymmetrical antenna structural representation of the present invention.Among Fig. 1, asymmetrical antenna of the present invention comprises feeder line 1, sheet metal 2.At least engrave asymmetrical first micro groove structure 100 and second micro groove structure 200 on the sheet metal 2, made asymmetrical antenna have at least two different resonant.Asymmetric first micro groove structure 100 that is meant here is different with pattern, size and/or the locus of second micro groove structure 200, and those differences cause first micro groove structure 100 different with the resonance band of second micro groove structure 200.
Feeder line 1 part is provided with feeds that sheet metal 2 is coupled around sheet metal 2.The mode of 1 pair of sheet metal of feeder line 2 coupling feeds can connect feeder line 1 and the inductive coupled feeding classification that sheet metal 2 forms through but a short circuit point is set, and also is not connected but the two relative part formation capacitive is coupled the capacitive that the forms feeding classification that is coupled with sheet metal 2 for feeder line 1.
First micro groove structure 100 of the present invention and second micro groove structure 200 can be the complementary helix structures shown in the complementary split ring resonator structure shown in Fig. 5 a, Fig. 5 b, a kind of in the two opening helical ring structures shown in the opening helical ring structure shown in Fig. 5 c, Fig. 5 d, the complementary folding line structure shown in Fig. 5 e or through several kinds of structures in front derive, compound or a micro groove structure that the group battle array obtains.Derive and be divided into two kinds; A kind of is that geometry is derived; Another kind is that expansion is derived, and the geometry is here derived and is meant that function class derives like, variform structure, is for example derived to class of a curve structure, triangle class formation and other different polygon class formation by the square frame class formation; The expansion is here derived and promptly on the basis of Fig. 5 a to Fig. 5 e, is offered new groove to form new micro groove structure; Complementary split ring resonator structure with shown in Fig. 5 a is an example, and Fig. 6 a is its geometry sketch map of deriving, and Fig. 6 b is its geometry sketch map of deriving.Compound being meant here, a plurality of stacks of the micro groove structure of Fig. 5 a to Fig. 5 e form a new micro groove structure, shown in Fig. 7 a, are the structural representation of the complementary split ring resonator structure shown in three Fig. 5 a after compound; Shown in Fig. 7 b, be that the complementary split ring resonator structure shown in two Fig. 5 a and Fig. 5 b are depicted as the common structural representation after compound of complementary helix structure.The group battle array here is meant the micro groove structure that is formed an integral body by the micro groove structure array on same sheet metal shown in a plurality of Fig. 5 a to Fig. 5 e, and is as shown in Figure 8, is the structural representation after a plurality of complementary split ring resonator structural group battle arrays shown in Fig. 5 a.But the present invention's first micro groove structure 100 and second micro groove structure 200 are asymmetric, and concrete asymmetric manner specifies in the execution mode below.
Technologies such as the mode that on sheet metal 2, forms first micro groove structure 100 and second micro groove structure 200 can be etching, bores quarter, photoetching, electronics quarter, ion quarter; Wherein be etched to selection process; Its key step is after designing suitable micro groove structure; Through etching machines, utilize the chemical reaction of solvent and metal to get rid of the sheet metal 2 that the paillon foil of presetting micro groove structure partly can obtain being formed with above-mentioned first micro groove structure 100 and second micro groove structure 200 then.The material of above-mentioned tinsel can be metals such as copper, silver.
The present invention also comprises the medium that is used to place said feeder line and said sheet metal, and medium can be air, pottery, epoxy resin base plate or ptfe substrate.
The present invention is if adopt first micro groove structure and second micro groove structure of symmetry on sheet metal 2; Promptly first micro groove structure is identical with the resonance frequency of second micro groove structure; After the two intercouples, will cause antenna Q value to increase, corresponding bandwidth BW diminishes, and is unfavorable for the realization of multimode resonance.And if adopt asymmetrical at least first micro groove structure and second micro groove structure; Because the two response capacitance that electromagnetic wave produced and inductance value can be different; Thereby produce a plurality of different resonance points; And these a plurality of different resonance points are difficult for offsetting, and help the multimodeization that realizes that antenna is abundant.
The version of first micro groove structure 100 of the present invention and second micro groove structure 200 can be the same, also can be different.And the asymmetric degree of first micro groove structure 100 and second micro groove structure 200 can be regulated as required.Thereby realize abundant adjustable multimode resonance.And as required, the present invention also can be provided with on the same sheet metal number more than two micro groove structure so that antenna has the different resonance band more than three.
Below discuss in detail the asymmetric micro groove structure that forms on three kinds of sheet metals 2 of the present invention.
As shown in Figure 2; Fig. 2 is the front view of first preferred embodiments of the present invention, and among Fig. 2, first micro groove structure 100 and second micro groove structure 200 are unsymmetric structure; Wherein, First micro groove structure 100 and second micro groove structure 200 link together, because the difference of pattern causes the asymmetric of its structure, make the regional separately resonance frequency of win micro groove structure 100 and second micro groove structure 200 different.Derived structure with complementary helix structure shown in Fig. 5 b and complementary helix structure in this execution mode is the example explanation, and the two interconnects.
As shown in Figure 3; Fig. 3 is the front view of second preferred embodiments of the present invention, and among Fig. 3, first micro groove structure 100 and second micro groove structure 200 are the different unsymmetric structure of pattern; Wherein, First micro groove structure 100 and second micro groove structure 200 are separately independently, because the difference of pattern causes the asymmetric of its structure, make the regional separately resonance frequency of win micro groove structure 100 and second micro groove structure 200 different.First micro groove structure 100 is the example explanation with the structure of opening helical ring shown in Fig. 5 c in this execution mode, and second micro groove structure 200 is the example explanation with complementary helix structure shown in Fig. 5 b.
As shown in Figure 4, be the front view of the 3rd preferred embodiments of the present invention, among Fig. 4; First micro groove structure 100 and second micro groove structure 200 are unsymmetric structure; Wherein, first micro groove structure 100 and second micro groove structure 200 are separately independently, and its pattern is identical; But the difference of its size causes the asymmetric of its structure, and the resonance frequency in zone is different separately to make win micro groove structure 100 and second micro groove structure 200.In this execution mode, first micro groove structure 100 and second micro groove structure 200 are the example explanation with the complementary helix structure shown in Fig. 5 c all.
The vehicle-mounted CMMB terminal that the embodiment of the invention provides also provides the antenna of being made up of a plurality of above-mentioned antennas, and all the single antennas on this antenna receive simultaneously simultaneously and send.This antenna can increase considerably the information throughput of system under the prerequisite that need not increase bandwidth, and has very high isolation, and the antijamming capability between a plurality of antennas is strong.First feeder line of each antenna and second feeder line are connected with receiving element after being electrically connected again.
Combine accompanying drawing that embodiments of the invention are described above; But the present invention is not limited to above-mentioned embodiment, and above-mentioned embodiment only is schematically, rather than restrictive; Those of ordinary skill in the art is under enlightenment of the present invention; Not breaking away under the scope situation that aim of the present invention and claim protect, also can make a lot of forms, these all belong within the protection of the present invention.
Claims (10)
1. a vehicle-mounted CMMB terminal comprises being used for demodulation DTV radiofrequency signal, the receiving element of output sound, video data stream; Sound, video data stream to receiving element output are decoded, and export corresponding sound, Video signal processing unit; And the broadcast unit that is connected with processing unit; It is characterized in that; Also comprise the antenna that at least one is connected with said receiving element; This antenna comprises feeder line and sheet metal; Said feeder line is characterized in that: engraved asymmetrical first micro groove structure and second micro groove structure on the said sheet metal at least, made said antenna have two different resonance band through the said sheet metal of coupled modes feed-in at least.
2. terminal as claimed in claim 1 is characterized in that, said terminal also comprises: broadcast unit is used to receive sound, the vision signal that processing unit is exported, output respective digital sound of television and picture.
3. terminal as claimed in claim 1 is characterized in that: said first micro groove structure is that one or several structures in complementary split ring resonator structure, complementary helix structure, opening helical ring structure, two opening helical ring structure and the complementary folding line structure are derived, the compound or group gust micro groove structure that obtains.
4. terminal as claimed in claim 1 is characterized in that: said second micro groove structure is complementary split ring resonator structure, complementary helix structure, opening helical ring structure, two opening helical ring structure, or complementary folding line structure.
5. terminal as claimed in claim 1 is characterized in that: said second micro groove structure be through several kinds of structures in complementary split ring resonator structure, complementary helix structure, opening helical ring structure, two opening helical ring structure and the complementary folding line structure derive, compound or a micro groove structure that group battle array obtains.
6. will go to 1 described terminal like right, it is characterized in that: said antenna also comprises the medium that is used to place said feeder line and said sheet metal.
7. terminal as claimed in claim 6 is characterized in that: said medium is air, pottery, epoxy resin base plate or ptfe substrate.
8. terminal as claimed in claim 1 is characterized in that: said first micro groove structure and said second micro groove structure through etching, bore quarter, photoetching, electronics is carved or ion is carved hollow out on said sheet metal.
9. terminal as claimed in claim 1 is characterized in that: said feeder line does not contact with said sheet metal, through the said sheet metal of capacitive coupled modes feed-in.
10. terminal as claimed in claim 1 is characterized in that: make said feeder line through the said sheet metal of inductive coupled mode feed-in but said feeder line connects said sheet metal through short circuit point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101811537A CN102801934A (en) | 2011-06-30 | 2011-06-30 | Vehicle-mounted China mobile multimedia broadcasting (CMMB) terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101811537A CN102801934A (en) | 2011-06-30 | 2011-06-30 | Vehicle-mounted China mobile multimedia broadcasting (CMMB) terminal |
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| Publication Number | Publication Date |
|---|---|
| CN102801934A true CN102801934A (en) | 2012-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101811537A Pending CN102801934A (en) | 2011-06-30 | 2011-06-30 | Vehicle-mounted China mobile multimedia broadcasting (CMMB) terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374194A (en) * | 2015-07-24 | 2017-02-01 | 青岛中科移动物联科技有限公司 | Small 433MHz FPC antenna |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201490337U (en) * | 2009-08-31 | 2010-05-26 | 深圳市启汉科技有限公司 | Monopole radio-frequency antenna |
| CN201515009U (en) * | 2009-08-20 | 2010-06-23 | 深圳市麦捷微电子科技股份有限公司 | Patch-type digital video broadcast ceramic antenna |
-
2011
- 2011-06-30 CN CN2011101811537A patent/CN102801934A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201515009U (en) * | 2009-08-20 | 2010-06-23 | 深圳市麦捷微电子科技股份有限公司 | Patch-type digital video broadcast ceramic antenna |
| CN201490337U (en) * | 2009-08-31 | 2010-05-26 | 深圳市启汉科技有限公司 | Monopole radio-frequency antenna |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374194A (en) * | 2015-07-24 | 2017-02-01 | 青岛中科移动物联科技有限公司 | Small 433MHz FPC antenna |
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Application publication date: 20121128 |