CN103095314A - China mobile multimedia broadcasting (CMMB) receiving terminal - Google Patents
China mobile multimedia broadcasting (CMMB) receiving terminal Download PDFInfo
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- CN103095314A CN103095314A CN2011103310487A CN201110331048A CN103095314A CN 103095314 A CN103095314 A CN 103095314A CN 2011103310487 A CN2011103310487 A CN 2011103310487A CN 201110331048 A CN201110331048 A CN 201110331048A CN 103095314 A CN103095314 A CN 103095314A
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- 230000008054 signal transmission Effects 0.000 claims description 3
- 230000005291 magnetic effect Effects 0.000 abstract description 6
- 230000005855 radiation Effects 0.000 abstract description 5
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- 238000010586 diagram Methods 0.000 description 9
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- 238000006243 chemical reaction Methods 0.000 description 3
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- 230000007613 environmental effect Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000005236 sound signal Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
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- 238000013475 authorization Methods 0.000 description 1
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Abstract
The invention relates to a China mobile multimedia broadcasting (CMMB) receiving terminal which comprises a CMMB receiving terminal main body and an antenna which transmits signal with the CMMB receiving terminal main body. The antenna is a metamaterial antenna which comprises a dielectric substrate, a metal structure, a feed line and a reference ground. The feed line is coupled with the metal structure in a mutual mode, and the reference ground comprises a first reference ground unit and a second reference ground unit which are respectively arranged on two opposite surfaces of the dielectric substrate. The first reference ground unit enables one end of the feed line to form a microstrip line. According to the CMMB receiving terminal, a topology form of the metal structure of the metamaterial antenna and reasonable arrangement of the microstrip line are accurately controlled, so that required equivalent dielectric constant and magnetic conductivity distribution are obtained. The antenna is enabled to realize good impedance matching in work frequency channels, and energy transition is finished efficiently, an ideal radiation pattern is obtained, and gain is high. In addition, the antenna is small in occupied size, and therefore the CMMB receiving terminal is small in entire size, and low in environment requirements.
Description
Technical field
The present invention relates to the wireless access terminal equipment technical field, relate in particular to a kind of CMMB receiving terminal.
Background technology
CMMB full name China Mobile Multimedia Broadcasting, that is: China Mobile multimedia broadcasting.CMMB is mainly towards the small screen hand-hold type receiving terminal, its end product kind comprises that mainly MP4, MP5, mobile phone, GPS, USB receive rod, independent receivers etc., digital broadcast television program, integrated information and urgent broadcast service are provided, realize the seamless collaborative covering that satellite transmission combines with ground network.CMMB adopts the mobile multimedia broadcast television technology with independent intellectual property right, system can run, can safeguard, can manage, possess broadcast type, reversible service function, support the transportation that central and local governments combine, possesses encryption authorization control and management system, support unified standard and unified operation, support user's whole nation roaming.
At present the television antenna of CMMB receiving terminal adopts external telescopic antenna to realize usually, however telescopic antenna because many reasons such as price, not attractive in appearance and external easy damage exist, therefore, built-in CMMB antenna is applied in the CMMB receiving terminal gradually.Because CMMB ground base station U wave band requires band limits 474-798Mhz, so existing CMMB built-in aerial required size is difficult to be full of this frequency range requirement, the built-in aerial receiving ability far is weaker than external antenna.Especially CMMB than low-frequency range 474-562Mhz band limits, be the difficult point of Antenna Design, even telescopic antenna also is difficult to the reception index that reaches satisfied in this frequency range always.At present, for head it off, also having some schemes to load the LNA circuit module compensates the signal that built-in CMMB antenna loses, but such design is very high to antenna self bandwidth requirement, namely the CMMB antenna size there are certain needs equally, LNA has also amplified noise signal in amplifying signal, have some frequencies to exist and flooded possibility by noise, has worsened on the contrary the CMMB receiving ability.Therefore, how to solve the existing defective of above-mentioned existing CMMB receiving terminal and become problem demanding prompt solution.
Summary of the invention
Technical problem to be solved by this invention is, for above-mentioned the deficiencies in the prior art, a kind of CMMB receiving terminal is proposed, the antenna of this CMMB receiving terminal is low to environmental requirement, gain high, can realize impedance matching preferably in working frequency range, complete expeditiously power conversion, and obtaining desirable radiation pattern, this CMMB receiving terminal overall volume is little.
the technical solution adopted for the present invention to solve the technical problems is, a kind of CMMB receiving terminal is proposed, the antenna that it comprises CMMB receiving terminal main body and is arranged on described CMMB receiving terminal main body and carries out with it the signal transmission, described antenna comprises medium substrate, metal structure, feeder line and reference, described metal structure, all be placed on described medium substrate to feeder line and reference, described feeder line and described metal structure intercouple, described the first reference unit, ground and the second unit, reference ground that is positioned at relative two surfaces of described medium substrate that comprise with reference to ground, described first makes an end of described feeder line form microstrip line with reference to the unit, ground.
Further, described CMMB receiving terminal main body comprises front end signal pretreatment module, baseband signal processing module and display module, described front end signal pretreatment module comprises tuner unit that order is electrically connected to, demodulating unit and UAM condition reception unit, described tuner unit is connected with described antenna electric, described UAM condition reception unit is electrically connected to described baseband signal processing module, and described tuner unit, demodulating unit and UAM condition reception unit are respectively used to receive signal, channel demodulation and the program decryption that sends from antenna; Described baseband signal processing module is used for completing communication protocol stack processing, system management and multimedia to be processed; Described display module is used for the information after baseband signal processing module is processed is shown the discernible information of adult.
Further, described medium substrate is provided with some plated-through holes, and described first realizes being electrically connected to by described plated-through hole with reference to the unit, ground with described second with reference to the unit, ground.
Further, described first is provided with the first metal covering unit and the second metal covering unit of mutual electrical connection with reference to the unit, ground, and described the first metal covering unit is relative with an end position of described feeder line, makes an end of described feeder line form described microstrip line; Described second is provided with the 3rd metal covering unit with reference to the unit, ground, and described the 3rd metal covering unit is relative with described the second metal covering cell position.
Further, described medium substrate is positioned at described the second metal covering unit and described the 3rd place, metal covering unit offers some plated-through holes, and described the second metal covering unit is electrically connected to by described plated-through hole with described the 3rd metal covering unit.
Further, described the 3rd metal covering unit is positioned at an end of described metal structure, and it is tabular that described the 3rd metal covering unit is long side, and identical with the bearing of trend of described feeder line.
Further, described second also is provided with the 4th metal covering unit with reference to the unit, ground, and described the 4th metal covering unit is positioned at a side of described feeder line one end, and is positioned on the bearing of trend of described feeder line.
Further, described medium substrate is positioned at described the first metal covering unit and described the 4th place, metal covering unit offers some plated-through holes, and described the first metal covering unit is electrically connected to by described plated-through hole with described the 4th metal covering unit.
Further, described metal structure be the compound rear structure of complementary opening resonance loop structure, complementary helix structure, opening helical ring structure, two opening helical ring structure, complementary folding line structure, the derived structure of complementary opening resonance loop structure, complementary opening resonance loop structure, any in the structure after complementary opening resonance loop structure group battle array.
Further, described metal structure is provided with framework and is positioned at two helixes of described framework, and described two helixes are interconnected to form the opening helical ring, and described opening helical ring is connected with described framework, and the free end of described helix is the panel shape.
In sum, CMMB receiving terminal of the present invention passes through critically topological form and the described microstrip line of rational deployment of control antenna metal structure, just the effective dielectric constant and the magnetic permeability that needing to obtain distribute, and make antenna can realize impedance matching preferably in working frequency range, complete expeditiously power conversion, and obtain desirable radiation pattern, gain high, in addition, it is little that described antenna takies volume, thereby the overall volume of CMMB receiving terminal is little, and is low to environmental requirement.
Description of drawings
Fig. 1 is the theory diagram of CMMB receiving terminal of the present invention;
Fig. 2 is the front view of CMMB receiving terminal antenna of the present invention;
Fig. 3 is the rearview of CMMB receiving terminal antenna of the present invention;
Fig. 4 a is the schematic diagram of complementary opening resonance loop structure;
Fig. 4 b is depicted as the schematic diagram of complementary helix structure;
Fig. 4 c is depicted as the schematic diagram of opening helical ring structure;
Fig. 4 d is depicted as the schematic diagram of two opening helical ring structures;
Fig. 4 e is depicted as the schematic diagram of complementary folding line structure;
Fig. 5 a is the derivative schematic diagram of its geometry of complementary opening resonance loop structure shown in Fig. 5 a;
Fig. 5 b is the derivative schematic diagram of its expansion of the complementary opening resonance loop structure shown in Fig. 5 a;
Fig. 6 a is the structural representation after three complementary opening resonance loop structures shown in Fig. 4 a compound;
Fig. 6 b is the compound schematic diagram that the complementary opening resonance loop structure shown in two Fig. 4 a and Fig. 4 b are depicted as complementary helix structure;
Fig. 7 is the structural representation after the complementary opening resonance loop structure group battle array shown in four Fig. 4 a.
Embodiment
Below in conjunction with drawings and the specific embodiments, CMMB receiving terminal of the present invention is further described:
Super material antenna forms based on the artificial electromagnetic material art designs, artificial electromagnetic material refers to sheet metal is engraved into the topological metal structure of given shape, and the topological metal structure of described given shape is arranged on certain dielectric constant and magnetic permeability base material and the equivalent extraordinary electromagnetic material of processing and manufacturing, its performance parameter depends primarily on the topological metal structure of the given shape of its sub-wavelength.In resonance band, artificial electromagnetic material embodies the dispersion characteristics of height usually, in other words, the impedance of antenna, holds perception, equivalent dielectric constant and magnetic permeability along with violent variation can occur frequency.Thereby can adopt the artificial electromagnetic material technology that the fundamental characteristics of above-mentioned antenna is transformed, make the medium substrate that metal structure depends on it form equivalently a highly dispersed extraordinary electromagnetic material, thereby realize the new antenna that radiation characteristic is abundant.
See also Fig. 1 to Fig. 3, CMMB receiving terminal of the present invention comprises CMMB receiving terminal main body 1 and the antenna 2 that is arranged on described CMMB receiving terminal main body 1 and carries out with it the signal transmission.described CMMB receiving terminal main body 1 comprises front end signal pretreatment module 11, baseband signal processing module 12, display module 13 and audio signal output module 14, described front end signal pretreatment module comprises the tuner unit 111 that order is electrically connected to, demodulating unit 112 and UAM condition reception unit 113, described tuner unit 111 is electrically connected to described antenna 2, described UAM condition reception unit 113 is electrically connected to described baseband signal processing module 12, described tuner unit 111, demodulating unit 112 and UAM condition reception unit 113 are respectively used to receive the signal that sends from antenna 2, channel demodulation and program decryption, communication protocol stack processing, system management and multimedia that described baseband signal processing module 12 is used for completing TD/GSM are processed, described display module 13 is used for the information after baseband signal processing module 12 is processed is shown the discernible information of adult, described audio signal output module 14 is used for converting the information after baseband signal processing module 12 is processed to audio signal.
In the present embodiment, described front end signal pretreatment module 11 and baseband signal processing module 12 are respectively IF228 chip and SH7343 chip, it is high that the IF228 chip has integrated level, extra small size, demodulation performance is strong, anti-single-frequency interference performance is strong, and super low-power consumption supports the multiple clock frequency to input and support the advantages such as hard descrambling.Described SH7343 chip can not only be realized the decoding of TS code stream hardware, and the signal that can bear baseband circuit is processed and function is controlled, the inner integrated efficient power administration module of while SH7343, can optimize the cpu power power consumption when higher position is managed speed, can provide good system scheme for exploitation and the perfect in shape and function of hand-held mobile terminal.
Described antenna 2 is super material antennas, and it comprises medium substrate 21, metal structure 22, feeder line 23 and with reference to ground, described medium substrate 21 is rectangular tabular, and it can be made by materials such as high molecular polymer, pottery, ferroelectric material, ferrite material or ferromagnetic materials.In the present embodiment, the material of described medium substrate 21 adopts glass material (FR4) to make, thereby not only cost is low, and can guarantee to keep good antenna operating characteristic in different operating frequencies.
described metal structure 22, all be placed on the surface of described medium substrate 21 to feeder line 23 and reference, described metal structure 22 forms super material with described medium substrate 21, the performance of described super material depends on described metal structure 22, in resonance band, super material embodies the dispersion characteristics of height usually, it is its impedance, hold perception, the dielectric constant of equivalence and magnetic permeability are along with violent variation can occur frequency, thereby by changing the fundamental characteristics of described metal structure 22 and medium substrate 21, just make described metal structure 22 form equivalently one according to the highly dispersed extraordinary electromagnetic material of Lorentz material resonances model with medium substrate 21.
See also Fig. 1 and Fig. 4 to Fig. 7, described metal structure 22 can be the compound rear structure of complementary opening resonance loop structure, complementary helix structure, opening helical ring structure, two opening helical ring structure, complementary folding line structure, the derived structure of complementary opening resonance loop structure, complementary opening resonance loop structure, any or similar topological metal structure or metal etch pattern in the structure after complementary opening resonance loop structure group battle array, the shape of described metal structure 22 has infinite multiple, is not limited to above-mentioned structure of lifting.In the present embodiment, described metal structure 22 is provided with framework 221 and is positioned at two helixes 222 of described framework 221, described two helixes 222 are interconnected to form the opening helical ring, described opening helical ring is connected with described framework 221, the free end of described helix 222 is the panel shape, and the end of described panel shape can increase the corrugated that is subjected to of antenna and amass.
Described feeder line 23 is arranged on a side of described metal structure 22, and extends along the length direction of described metal structure 22, and itself and described metal structure 22 intercouple, and wherein, an end bending of described feeder line 23 extends to described metal structure 22 end one sides.In addition, embed as required the capacitive electronic component in the space between described feeder line 23 and metal structure 22, regulate signal coupling between feeder line 23 and metal structure 22 by embedding the capacitive electronic component, by formula:
, square being inversely proportional to of the size of capacitance and operating frequency as can be known, so when the operating frequency that needs during for low operating frequency, can be by suitable embedding capacitive electronic component realization.The capacitance scope of the capacitive electronic component that adds is usually between 0-2pF, but the capacitance that embeds along with the variation of operating frequency of antenna also may exceed the scope of 0-2pF.
Described reference ground is positioned at a side of described feeder line 23, makes an end formation microstrip line 231 of the described metal structure of being positioned at of described feeder line 23 22 ends.In the present embodiment, described with reference to ground comprise first with reference to unit 24, ground and second with reference to unit 25, ground, described first lays respectively at relative two surfaces of described medium substrate 21 with reference to unit 24, ground and second with reference to unit 25, ground.Described first is provided with the first metal covering unit 241 and the second metal covering unit 242 of mutual electrical connection with reference to unit 24, ground.Described second is positioned at the same side of described medium substrate 21 with reference to unit 25, ground with described feeder line 23, and is provided with the 3rd metal covering unit 251 and the 4th metal covering unit 252.
Described the first metal covering unit 241 is relative with described feeder line 23 positions, makes an end of the described metal structure of being positioned at of described feeder line 23 22 ends form described microstrip line 231, namely described with reference to ground for virtually.Described the second metal covering unit 242 is relative with 251 positions, described the 3rd metal covering unit.Described the 3rd metal covering unit 251 is positioned at an end of described metal structure 22, and it is tabular that described the 3rd metal covering unit 251 is long side, and identical with the bearing of trend of described feeder line 23.Described medium substrate 21 is positioned at described the second metal covering unit 242 and 251 places, described the 3rd metal covering unit offer some plated-through holes 26, and described the second metal covering unit 242 is electrically connected to by described plated-through hole 26 with described the 3rd metal covering unit 251.
Described the 4th metal covering unit 252 is positioned at a side of described feeder line 23 1 ends, and is positioned on the bearing of trend of described feeder line 23.Described medium substrate 21 is positioned at described the first metal covering unit 241 and 252 places, described the 4th metal covering unit offer some plated-through holes 26, and described the first metal covering unit 241 is electrically connected to by described plated-through hole 26 with described the 4th metal covering unit 252.An end by the first metal covering unit 241 and described feeder line 23 forms described microstrip line 231, thereby can reduce external signal the signal that transmits on described feeder line 23 is disturbed, and improves antenna gain, realizes impedance matching preferably, saves material, and cost is low.Arrange by position cleverly between 241 to the 4th metal covering unit 252, described the first metal covering unit, thereby make and describedly take less space with reference to ground, just the larger area of realization.In addition, by described plated-through hole 26 is set, thereby can further improve described area with reference to ground.
In sum, CMMB receiving terminal of the present invention passes through critically topological form and the described microstrip line 231 of rational deployment of control antenna metal structure 22, just the effective dielectric constant and the magnetic permeability that needing to obtain distribute, and make antenna can realize impedance matching preferably in working frequency range, complete expeditiously power conversion, and obtain desirable radiation pattern, gain high, in addition, it is little that described antenna takies volume, thereby the overall volume of CMMB receiving terminal is little, and is low to environmental requirement.
the above is described preferred embodiment of the present invention by reference to the accompanying drawings, but the present invention is not limited to above-mentioned embodiment, above-mentioned embodiment is only schematic, rather than restrictive, those of ordinary skill in the art is under enlightenment of the present invention, do not breaking away from the scope situation that aim of the present invention and claim protect, also can make a lot of forms, for example, be provided with connector between described metal structure 22 and described feeder line 23, described metal structure 22 is electrically connected to mutually with described feeder line 23, it is the inductive coupled mode etc. that adopts between described metal structure 22 and described feeder line 23, within these all belong to protection scope of the present invention.
Claims (10)
1. CMMB receiving terminal, the antenna that comprises CMMB receiving terminal main body and be arranged on described CMMB receiving terminal main body and carry out with it the signal transmission, it is characterized in that: described antenna is super material antenna, this antenna comprises medium substrate, metal structure, feeder line and reference, described metal structure, all be placed on described medium substrate to feeder line and reference, described feeder line and described metal structure intercouple, be positioned at described medium substrate relative two lip-deep first with reference to unit, ground and the second unit, reference ground described comprising with reference to ground, described first makes an end of described feeder line form microstrip line with reference to the unit, ground.
2. CMMB receiving terminal according to claim 1, it is characterized in that: described CMMB receiving terminal main body comprises the front end signal pretreatment module, baseband signal processing module and display module, described front end signal pretreatment module comprises the tuner unit that order is electrically connected to, demodulating unit and UAM condition reception unit, described tuner unit is connected with described antenna electric, described UAM condition reception unit is electrically connected to described baseband signal processing module, described tuner unit, demodulating unit and UAM condition reception unit are respectively used to receive the signal that sends from antenna, channel demodulation and program decryption, described baseband signal processing module is used for completing communication protocol stack processing, system management and multimedia to be processed, described display module is used for the information after baseband signal processing module is processed is shown the discernible information of adult.
3. CMMB receiving terminal according to claim 1 and 2, it is characterized in that: described medium substrate is provided with some plated-through holes, and described first is electrically connected to by described plated-through hole realization with reference to the unit, ground with described second with reference to the unit, ground.
4. CMMB receiving terminal according to claim 1 and 2, it is characterized in that: described first is provided with the first metal covering unit and the second metal covering unit of mutual electrical connection with reference to the unit, ground, described the first metal covering unit is relative with an end position of described feeder line, makes an end of described feeder line form described microstrip line; Described second is provided with the 3rd metal covering unit with reference to the unit, ground, and described the 3rd metal covering unit is relative with described the second metal covering cell position.
5. CMMB receiving terminal according to claim 4, it is characterized in that: described medium substrate is positioned at described the second metal covering unit and described the 3rd place, metal covering unit offers some plated-through holes, and described the second metal covering unit is electrically connected to by described plated-through hole with described the 3rd metal covering unit.
6. CMMB receiving terminal according to claim 5 is characterized in that: described the 3rd metal covering unit is positioned at an end of described metal structure, and it is tabular that described the 3rd metal covering unit is long side, and identical with the bearing of trend of described feeder line.
7. CMMB receiving terminal according to claim 4 is characterized in that: described second also comprises the 4th metal covering unit with reference to the unit, ground, and described the 4th metal covering unit is positioned at a side of described feeder line one end, and is positioned on the bearing of trend of described feeder line.
8. CMMB receiving terminal according to claim 7, it is characterized in that: described medium substrate is positioned at described the first metal covering unit and described the 4th place, metal covering unit offers some plated-through holes, and described the first metal covering unit is electrically connected to by described plated-through hole with described the 4th metal covering unit.
9. CMMB receiving terminal according to claim 1 and 2 is characterized in that: described metal structure is the compound rear structure of complementary opening resonance loop structure, complementary helix structure, opening helical ring structure, two opening helical ring structure, complementary folding line structure, the derived structure of complementary opening resonance loop structure, complementary opening resonance loop structure, any in the structure after complementary opening resonance loop structure group battle array.
10. CMMB receiving terminal according to claim 1 and 2, it is characterized in that: described metal structure is provided with framework and is positioned at two helixes of described framework, described two helixes are interconnected to form the opening helical ring, described opening helical ring is connected with described framework, and the free end of described helix is the panel shape.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110331048.7A CN103095314B (en) | 2011-10-27 | 2011-10-27 | CMMB receives terminal |
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| CN201110331048.7A CN103095314B (en) | 2011-10-27 | 2011-10-27 | CMMB receives terminal |
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| CN1913224A (en) * | 2005-08-09 | 2007-02-14 | 技嘉科技股份有限公司 | Circuit board antenna |
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