CN101212230B - Device and method for implementing DVB-H antenna matching network for mobile telephone - Google Patents
Device and method for implementing DVB-H antenna matching network for mobile telephone Download PDFInfo
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- CN101212230B CN101212230B CN2006101696557A CN200610169655A CN101212230B CN 101212230 B CN101212230 B CN 101212230B CN 2006101696557 A CN2006101696557 A CN 2006101696557A CN 200610169655 A CN200610169655 A CN 200610169655A CN 101212230 B CN101212230 B CN 101212230B
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Abstract
The invention discloses a device and a method thereof for realizing a matching network of a DVB-H antenna of a cell phone, which are used in a DVB-H antenna system of a DVB-H handheld device. The invention is characterized in that: the method comprises the following steps: step 1. an interface of the antenna system is connected with an input end of a radio frequency switch; an output end of the radio frequency switch is respectively connected with N branches, and the number of the branches is a natural number; step 2. a corresponding matching antenna is set for each branch; each matching antenna is regulated to a corresponding equivalent matching circuit through topology optimization of the matching circuit according to the working condition of the antenna system, and then each branch is connected with a feeding port of the antenna in the antenna system. Compared with a proposal of a parallel matching circuit selected by the former switch, the invention removes a radio frequency switch 2 and selects matching of each branch in on state, thus solving the problem of non-ideal work of the radio frequency switch 2 in the former proposal and saving device cost consequently.
Description
Technical field
The present invention relates to a kind of mobile phone DVB-H antenna, particularly relate to the implement device and the method thereof of the matching network of the DVB-H antenna in the communication field.
Background technology
1993; DVB (Digital Video Broadcast; Digital television broadcasting) project begins to carry out, and is intended to develop the DVB standard, and the back is by international normal structure ETSI (EuropeanTelecommunication Standards Institute; ETSI) and CENELEC (European Committee for Electrotechnical Normalization, CENELEC) form international standard.The DVB main standard comprises: satellite digital TV transmission system DVB-S, ground digital TV transmission system DVB-T, cable digital TV transmission system DVB-C.In November, 1994, ETSI formally adopts DVB-H standard (development on the basis of DVB-T), is used for battery powered mobile phone terminal.DVB-H not only provides TV programme to the user, and other public services such as film, news, music, weather forecast can also be provided.
The DVB-H system adopts the 470-862MHz frequency range usually; If at GSM (Global System forMobile communication; Global system for mobile communications) on the 900 standard mobile phone terminal; The general employing 470-698MHz frequency range of recommending, this just requires antenna to have same wide working frequency range (about 58.86%, 39.04%).When realizing, external antenna generally adopts whip antenna, helical antenna, has adopted the telescopic mechanical structure of pull bar, is easy to realize and satisfy the system gain requirement; Built-in aerial is because the restriction of mobile phone volume also is in development at present.In the DVB-H of ETSI standard, mention, if antenna will cover full frequency band, antenna will adopt adjustable match circuit as far as possible.
At present, about several kinds of schemes below commonly used the arriving in the antenna-matching circuit:
(1) switch is selected parallelly connected match circuit: the port A of antenna system (comprising antenna and matching network) (general and DVB-H handheld device circuit PCB (Print Circuit Board; Printed circuit board (PCB)) signal port of plate links to each other) receive the single input of a RF switch 1 (for the 1XN switch) earlier; The N of RF switch 1 output is received N branch road respectively and (whole working band is divided into the N sub-frequency bands; Antenna matees the match circuit that forms oneself respectively on each sub-band, respectively corresponding each branch road), these branch roads are received N input port of RF switch 2 (for the NX1 switch) more respectively; The single output of RF switch 2 meets antenna current feed port B; As shown in Figure 1, because restriction of mobile phone inner space and circuit loss, number of branches N is too much unsuitable.
The shortcoming of this scheme is: during real work, RF switch 2 work that are connected with antenna are unsatisfactory, and the input and output of switch do not match (departing from 50 ohm), and the isolation of each input port is not enough simultaneously.As, when the switch of N=2 is selected parallelly connected match circuit, mate topology and elect L type (inductance inductance of parallel connection again of promptly connecting) as; During real work; Because RF switch 2 work is undesirable, cause antenna at low frequency (or high frequency) branch road than low frequency (or high frequency) the state antenna performance of coupling separately down, descend a lot; Especially low frequency performance worsens, and can satisfy the system index requirement hardly;
(2) electrical tilt antenna: use adjustable device to realize match circuit.
The shortcoming of this scheme is: in the electricity accent device, varactor passes through to change DC (Direct Current, direct current) biasing and is easy to realize, the still electric adjustable inductance especially less electricity of volume is transferred inductance, is difficult to realize.
Therefore, the DVB-H antenna problem that need solve is how to provide reasonable adjustable match circuit to realize the scheme that the broadband covers.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of implement device and method thereof of DVB-H antenna matching network for mobile telephone, is used to realize mobile phone DVB-H aerial network matching optimization.
To achieve these goals, the invention provides a kind of implement device of DVB-H antenna matching network for mobile telephone, be used for the DVB-H antenna system of DVB-H handheld device, it is characterized in that, comprising:
One jockey is used for the port of said antenna system is connected to the input of a RF switch, and the output with said RF switch is connected respectively to N branch road again, and number of branches N is a natural number; And
One coalignment; Be used to said each branch road corresponding match circuit respectively is set; And through the match circuit topological optimization said each match circuit is adjusted into corresponding equivalent matched circuit according to the operating state of said antenna system by said RF switch, more said each branch road is connected to the antenna current feed port of said antenna system.
To achieve these goals, the present invention also provides a kind of implementation method of DVB-H antenna matching network for mobile telephone, is used for the DVB-H antenna system of DVB-H handheld device, it is characterized in that, comprising:
Step 2; For said each branch road respectively is provided with corresponding match circuit; And through the match circuit topological optimization said each match circuit is adjusted into corresponding equivalent matched circuit according to the operating state of said antenna system, more said each branch road is connected to the antenna current feed port of said antenna system.
The implementation method of described DVB-H antenna matching network for mobile telephone, wherein, in the said step 1, said number of branches N value is 2 or 3.
The implementation method of described DVB-H antenna matching network for mobile telephone, wherein, in the said step 2, the topological form of said each match circuit comprises L type circuit, pi-network and T type circuit.
The implementation method of described DVB-H antenna matching network for mobile telephone; Wherein, In the said step 2; When said number of branches N value was 2, corresponding second match circuit of first match circuit that first branch road is corresponding, second branch road topology respectively was a L type circuit, and with the frequency range of said antenna system be divided into the low-frequency range corresponding with said first match circuit, with the corresponding high band of said second match circuit.
The implementation method of described DVB-H antenna matching network for mobile telephone, wherein, set said L type circuit and be series connection first electric capacity parallel connection first inductance:
When said antenna system was operated in low-frequency range, said RF switch was connected said first branch road, first capacitance open circuit in said second branch road, the first inductance ground connection;
When said antenna system was operated in high band, said RF switch was connected said second branch road, first capacitance open circuit in said first branch road, the first inductance ground connection.
The implementation method of described DVB-H antenna matching network for mobile telephone; Wherein, In the said step 2, when said number of branches N value was 2, first match circuit topology that first branch road is corresponding was a L type circuit; Second match circuit topology that second branch road is corresponding is a pi-network, and with the frequency range of said antenna system be divided into the low-frequency range corresponding with said first match circuit, with the corresponding high band of said second match circuit.
The implementation method of described DVB-H antenna matching network for mobile telephone wherein, is set said L type circuit and is series connection first electric capacity parallel connection first inductance, and pi-network is parallelly connected second electric capacity, series connection the 3rd electric capacity, parallelly connected second inductance again:
When said antenna system was operated in low-frequency range, said RF switch was connected said first branch road, the second inductance ground connection in said second branch road, second electric capacity and the 3rd capacitances in series ground connection;
When said antenna system was operated in high band, said RF switch was connected said second branch road, first capacitance open circuit in said first branch road, the first inductance ground connection.
The implementation method of described DVB-H antenna matching network for mobile telephone, wherein, the electric capacity in said L type circuit, pi-network and/or the T type circuit, the reactance value of inductance are confirmed according to the operating state of said antenna system when low-frequency range, the high band.
The implementation method of described DVB-H antenna matching network for mobile telephone wherein, in the said step 2, is connected to said antenna current feed port with said each branch road through transmission line.
The useful technique effect of technical scheme of the present invention is:
Select parallelly connected match circuit scheme to compare with original switch, removed RF switch 2, each bar branch road is selected to mate under the connection situation, solved the unfavorable problem of former scheme RF switch 2 work, also practiced thrift device cost simultaneously.
Describe the present invention below in conjunction with accompanying drawing and specific embodiment, but not as to qualification of the present invention.
Description of drawings
Fig. 1 is the sketch map that existing switch is selected parallelly connected match circuit scheme;
Fig. 2 is the sketch map of antenna matching network scheme of the present invention;
Fig. 3 is an antenna match scheme specific embodiment one of the present invention;
Fig. 4 is embodiment illustrated in fig. 3 one equivalent matched circuit diagram when being operated in low-frequency range;
Fig. 5 is an antenna match scheme specific embodiment two of the present invention;
Fig. 6 is embodiment illustrated in fig. 5 two equivalent matched circuit diagrams when being operated in low-frequency range;
Fig. 7 is embodiment illustrated in fig. 5 two equivalent matched circuit diagrams when being operated in high band.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
Seeing also shown in Figure 2ly, is the sketch map of antenna matching network scheme of the present invention.As shown in Figure 2, the implement device of the DVB-H antenna matching network for mobile telephone of having described is applied to the DVB-H antenna system of DVB-H handheld device, and said device comprises jockey 10 and coalignment 20.
General N elects 2 or 3 as, is about to whole working band and is divided into the corresponding branch road of 2 to 3 sub-band, and match circuit is connected at this branch road on each branch road, other branch roads break off but under the situation that match circuit exists, antenna is mated on corresponding frequency sub-band.
Seeing also shown in Figure 3ly, is antenna match scheme specific embodiment one of the present invention, and Fig. 4 is embodiment illustrated in fig. 3 one equivalent matched circuit diagram when being operated in low-frequency range.
As shown in Figure 3, number of branches is 2, i.e. N=2, and the match circuit topology is elected the L type as in the branch, is inductance of an electric capacity parallel connection of series connection.Whole frequency is divided into low-frequency range and high band, corresponds respectively to branch road 1 and branch road 2.
When system works during in low-frequency range; RF switch 1 is connected branch road 1; Capacitor C 2 open circuits in the branch road 2, inductance L 2 ground connection; This moment, port A and the equivalent matched circuit between antenna current feed port B of antenna system were as shown in Figure 4, the port A that is equivalent to antenna system connected a capacitor C 1, parallelly connected equivalent inductance L
*
When system works during at high band, RF switch 1 is connected branch road 2, capacitor C 1 open circuit in the branch road 1, inductance L 1 ground connection, in like manner, this moment antenna system port A and antenna current feed port B between connected a capacitor C 2 and parallelly connected equivalent inductance.
Can find out that during for low-frequency range and high band operation, two branch roads have all been participated in coupling, are not separate incoherent.When therefore designing, C1, C2, L1, L2 are optimized simultaneously, design corresponding reactance numerical value according to two kinds of operating states.
When L type coupling during for electric capacity of an inductance parallel connection of series connection, same, can between the port A of antenna system and antenna current feed port B, form the equivalent matched circuit.
Seeing also shown in Figure 5ly, is antenna match scheme specific embodiment two of the present invention, and Fig. 6 is embodiment illustrated in fig. 5 two equivalent matched circuit diagrams when being operated in low-frequency range, and Fig. 7 is embodiment illustrated in fig. 5 two equivalent matched circuit diagrams when being operated in high band.
As shown in Figure 5, number of branches still is 2, and the match circuit topology is the L type in the branch 1, the inductance of an electric capacity parallel connection that is to connect, and match circuit topology be the π type in the branch 2, is electric capacity of parallel connection, the electric capacity of connecting, parallelly connected inductance again.Whole frequency is divided into low-frequency range and high band, corresponds respectively to branch road 1 and branch road 2.
When system works during in low-frequency range; RF switch 1 is connected branch road 1; Inductance L 2 ground connection in the branch road 2, capacitor C 2 and C3 series connection ground connection; This moment, port A and the equivalent matched circuit between antenna current feed port B of antenna system were as shown in Figure 6, the port A that is equivalent to antenna system connected a capacitor C 1, parallelly connected equivalent inductance L
*With equivalent capacity C
*
When system works during at high band; RF switch 1 is connected branch road 2; Capacitor C 1 open circuit in the branch road 1, inductance L 1 ground connection; This moment, port A and the equivalent matched circuit between antenna current feed port B of antenna system were as shown in Figure 7, be equivalent to antenna system port A parallel connection capacitor C 3, the capacitor C 2 of having connected, parallelly connected again equivalent inductance L
*
When therefore designing, C1, C2, C3, L1, L2 are optimized simultaneously, design corresponding reactance numerical value according to low frequency and two kinds of operating states of high frequency.
The match circuit topology is under the other forms of situation, like T type circuit, and same being suitable for.
When coupling number of branches N is 3, as a same reason, connect a certain branch road when RF switch, consider the reactance influence of two branch roads in addition, can equivalent matched circuit of formation between the port A of antenna system and antenna current feed port B.At this moment, all coupling device value are carried out the network matching optimization as variable according to 3 kinds of operating states (RF switch is connected the corresponding branch road work of low frequency, intermediate frequency and high frequency respectively).
The present invention overcomes the deficiency of the existing adjustable match circuit scheme of DVB-H antenna, and a kind of implementation method of adjustable match circuit is provided, and the antenna scheme that the present invention adopts has following advantage:
1), realized to satisfy system requirements to the electric adjustable match circuit of DVB-H antenna broadband operation requirement;
2), can guarantee the switch operate as normal.Select the coupling branch road owing to only adopt a RF switch; These switch input and output all can be carried out good impedance matching (50 ohm); Removed another RF switch that joins with antenna current feed port; Therefore do not exist the serious mismatch of switch, isolation low, cause the problem that antenna performance worsens;
3), reduced the switch power consumption, used a NX1 switching device because select parallelly connected match circuit to lack than original switch; And
4), be easy to modularization, practiced thrift cost.Used a NX1 switching device owing to select parallelly connected match circuit to lack, realized that therefore the network cost of electric adjustable wide-band coupling has descended than original switch.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. the implement device of a DVB-H antenna matching network for mobile telephone is used for the DVB-H antenna system of DVB-H handheld device, it is characterized in that, comprising:
One jockey; Be used for the port of said antenna system is connected to the input of a RF switch; Output with said RF switch is connected respectively to N branch road again, and number of branches N is a natural number, and the port of this antenna system is connected with the signal port of DVB-H handheld device circuit pcb board; And
One coalignment; Be used to said each branch road corresponding match circuit respectively is set; And through the match circuit topological optimization said each match circuit is adjusted into corresponding equivalent matched circuit according to the operating state of said antenna system by said RF switch, more said each branch road is connected directly to the antenna current feed port of said antenna system.
2. the implementation method of a DVB-H antenna matching network for mobile telephone is used for the DVB-H antenna system of DVB-H handheld device, it is characterized in that, comprising:
Step 1; The port of said antenna system is connected to the input of a RF switch; The output of said RF switch is connected respectively to N branch road, and number of branches N is a natural number, and the port of this antenna system is connected with the signal port of DVB-H handheld device circuit pcb board; And
Step 2; For said each branch road respectively is provided with corresponding match circuit; And through the match circuit topological optimization said each match circuit is adjusted into corresponding equivalent matched circuit according to the operating state of said antenna system, more said each branch road is connected directly to the antenna current feed port of said antenna system.
3. the implementation method of DVB-H antenna matching network for mobile telephone according to claim 2 is characterized in that, in the said step 1, said number of branches N value is 2 or 3.
4. the implementation method of DVB-H antenna matching network for mobile telephone according to claim 3 is characterized in that, in the said step 2, the topological form of said each match circuit comprises L type circuit, pi-network and T type circuit.
5. the implementation method of DVB-H antenna matching network for mobile telephone according to claim 4; It is characterized in that; In the said step 2; When said number of branches N value was 2, corresponding second match circuit of first match circuit that first branch road is corresponding, second branch road topology respectively was a L type circuit, and with the frequency range of said antenna system be divided into the low-frequency range corresponding with said first match circuit, with the corresponding high band of said second match circuit.
6. the implementation method of DVB-H antenna matching network for mobile telephone according to claim 5; It is characterized in that; The L type circuit of setting in said first branch road is series capacitance (C1) shunt inductance (L1), and the L type circuit of setting in said second branch road is series capacitance (C2) shunt inductance (L2):
When said antenna system was operated in low-frequency range, said RF switch was connected said first branch road, electric capacity (C2) open circuit in said second branch road, inductance (L2) ground connection;
When said antenna system was operated in high band, said RF switch was connected said second branch road, electric capacity (C1) open circuit in said first branch road, inductance (L1) ground connection.
7. the implementation method of DVB-H antenna matching network for mobile telephone according to claim 4; It is characterized in that; In the said step 2, when said number of branches N value was 2, first match circuit topology that first branch road is corresponding was a L type circuit; Second match circuit topology that second branch road is corresponding is a pi-network, and with the frequency range of said antenna system be divided into the low-frequency range corresponding with said first match circuit, with the corresponding high band of said second match circuit.
8. the implementation method of DVB-H antenna matching network for mobile telephone according to claim 7; It is characterized in that; Set said L type circuit and be series connection first electric capacity parallel connection first inductance, pi-network is parallelly connected second electric capacity, series connection the 3rd electric capacity, parallelly connected second inductance again:
When said antenna system was operated in low-frequency range, said RF switch was connected said first branch road, the second inductance ground connection in said second branch road, second electric capacity and the 3rd capacitances in series ground connection;
When said antenna system was operated in high band, said RF switch was connected said second branch road, first capacitance open circuit in said first branch road, the first inductance ground connection.
9. according to the implementation method of the arbitrary described DVB-H antenna matching network for mobile telephone of claim 4-8; It is characterized in that the electric capacity in said L type circuit, pi-network and/or the T type circuit, the reactance value of inductance are confirmed according to the operating state of said antenna system when low-frequency range, the high band.
10. according to the implementation method of the arbitrary described DVB-H antenna matching network for mobile telephone of claim 4-8, it is characterized in that, in the said step 2, said each branch road is connected to said antenna current feed port through transmission line.
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| CN2006101696557A CN101212230B (en) | 2006-12-26 | 2006-12-26 | Device and method for implementing DVB-H antenna matching network for mobile telephone |
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| CN2006101696557A CN101212230B (en) | 2006-12-26 | 2006-12-26 | Device and method for implementing DVB-H antenna matching network for mobile telephone |
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| CN101212230B true CN101212230B (en) | 2012-07-11 |
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| TW201208191A (en) * | 2010-08-11 | 2012-02-16 | Murata Manufacturing Co | Frequency-stabilizing circuit, antenna apparatus and communication terminal device |
| CN101958723B (en) * | 2010-09-17 | 2014-06-25 | 惠州Tcl移动通信有限公司 | Mobile terminal and antenna matching method thereof |
| CN201975511U (en) * | 2010-12-15 | 2011-09-14 | 中兴通讯股份有限公司 | Terminal antenna |
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| CN103731175A (en) * | 2012-10-10 | 2014-04-16 | 深圳富泰宏精密工业有限公司 | Antenna assembly and wireless communication device provided with antenna assembly |
| JP5928433B2 (en) * | 2013-10-25 | 2016-06-01 | 株式会社村田製作所 | High frequency circuit module |
| EP3070785B1 (en) * | 2013-12-20 | 2018-11-07 | Huawei Device (Dongguan) Co., Ltd. | Antenna and terminal |
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| CN106788563A (en) * | 2016-12-21 | 2017-05-31 | 上海斐讯数据通信技术有限公司 | A kind of matching network circuit of terminal radio frequency circuit |
| CN106961021A (en) * | 2017-03-14 | 2017-07-18 | 珠海市魅族科技有限公司 | The intelligent selecting method of intelligent selection module and terminal antenna frequency range |
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| FR3074379B1 (en) * | 2017-11-24 | 2020-11-13 | Continental Automotive France | AUTHENTICATION READER FOR AUTOMOTIVE VEHICLE OPENER |
| CN108808245B (en) * | 2018-06-06 | 2020-12-22 | Oppo（重庆）智能科技有限公司 | Tuning switch processing method and device, storage medium and electronic equipment |
| CN112821074B (en) * | 2021-01-04 | 2023-04-28 | 中国人民解放军海军工程大学 | Active short wave broadband double whip antenna |
| CN115001526A (en) * | 2022-08-05 | 2022-09-02 | 荣耀终端有限公司 | Radio frequency system, control method for radio frequency system and electronic equipment |
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