CN102437419B - Three-dimensional broadband reconfigurable antenna system for mobile terminal - Google Patents
Three-dimensional broadband reconfigurable antenna system for mobile terminal Download PDFInfo
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- CN102437419B CN102437419B CN2011102469852A CN201110246985A CN102437419B CN 102437419 B CN102437419 B CN 102437419B CN 2011102469852 A CN2011102469852 A CN 2011102469852A CN 201110246985 A CN201110246985 A CN 201110246985A CN 102437419 B CN102437419 B CN 102437419B
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Abstract
The invention relates to a three-dimensional broadband reconfigurable antenna system for a mobile terminal, belonging to the field of a mobile terminal antenna. The three-dimensional broadband reconfigurable antenna system is characterized by being printed on a printed circuit board and comprising a radiation antenna unit, a feeder line, a direct current power supply line, and a metal substrate. The radiation unit comprises a monopole sub antenna unit and a substrate branch of a parasitic folding line structure, the height of the antenna is only 6.5mm, a three-dimensional structure is adopted, and the area occupied on a motherboard is reduced. A direct current bias circuit on the front face of the motherboard is used for controlling the on/off state of a PIN (P-Intrinsic-N) diode, and an isolating alternating-current inductor is adopted in a direct current circuit to prevent passing of alternating current in the radiation antenna unit. The metal substrate is arranged on the back of the motherboard and is used for simulating other metal parts of a mobile terminal of a wireless communication system except the antenna. The three-dimensional broadband reconfigurable antenna system provided by the invention has the advantages of broad band/multiple bands, compact structure and easy assembly, and the system can support the function of reconfiguring directional diagrams and is suitable for reconfigurable antenna structures for mobile terminals, in particular small-sized mobile terminals.
Description
Technical field
The invention belongs to portable terminal reconfigurable antenna design field, it is special but be not limited to for the portable terminal reconfigurable antenna system structure design at the complex communication environment to relate to a kind of radio communication.
Background technology
The Modern wireless communication technical development is rapid, and except traditional speech business continued extensive development, the wireless data transmission also developed rapidly as video, video transmission service etc., and incident problem is exactly how to realize the quick transmission of data and guarantee communication quality.Antenna is the important component part that connects wireless channel and communication system, and its performance has significant effects to whole communication system.Along with mobile communication system in the operational continuous upgrading of function, capacity, quality and service, the mobile terminal antenna system need satisfy more and more higher performance index requirement; Simultaneously, antenna system on the portable terminal is usually operated in the complicated wireless propagation environment, when propagating, electromagnetic wave will be subjected to many-sided decline aloft, wireless channel is complicated and changeable because being subjected to Effect of Environmental such as landform, temperature, humidity in addition, and the communication quality of mobile radio system can be subjected to very big influence thus.
In addition, portable terminal is just little towards volume, and is in light weight, and stand-by time is long, low cost, and radiation efficiency height and directions such as multifrequency or wideband develop, and all these require also to have proposed very great challenge for the antenna design that is applied on the portable terminal.
The proposition of reconfigurable antenna is to propose for the fast development that adapts to modern wireless communication systems.Since the early 1980s, reconfigurable antenna is rapidly developed.It is by introducing relative position or the CURRENT DISTRIBUTION that variset (for example PIN switching diode, MEMS device) changes antenna radiation unit, make the antenna can be according to the various characteristics of the real-time reconstruct antenna of actual environment needs, realizing the real-time change of antenna performances such as antenna working frequency range, directional diagram, polarization mode, thereby for the capacity, the expanding system function that improve the wireless composite information system, increase the system works bandwidth, improve aspects such as signal to noise ratio the important techniques guarantee is provided.In addition, because reconfigurable antenna can be controlled antenna pattern by the real time altering antenna structure, thereby can only use one or seldom several signal feed-in port, this has just significantly reduced the synthetic trouble of multiport antenna system signal, has also eliminated because loss of signal and the noise that the multiple port signal building-up process is introduced.Therefore, in order to design compact conformation, easy of integration and be applicable to the particularly antenna structure of small size portable terminal of mobile communication terminal, reconfigurable antenna is effective solution.
Summary of the invention
The purpose of this invention is to provide a kind of structural design that realizes the communication mobile terminal reconfigurable antenna of multiband/broadband, low cost, easy of integration, electric small-size.It can overcome existing wireless communications mobile terminal antenna performance and structural deficiency, selects antenna radiation unit by the mode that adds the PIN switching diode, thereby changes the antenna pattern of antenna; By adopting stereochemical structure, realize the antenna system configuration compactness; Adopt the printed circuit board machining process of common digital circuit, make the antenna cost very low.
The invention is characterized in, contain: dielectric-slab, radiating antenna unit, parasitic fold line structure twelve Earthly Branches, microstrip feed line, sheet metal, metal ground and two dc bias circuits, wherein:
Dielectric-slab, rectangular, amount to four: thus mainboard 1, be positioned at this mainboard 1 short brink top board 2, be positioned at this mainboard 1 left and right long side and be connected first side plate 31 and second side plate 32 of formation " ∏ " font respectively with these top board 2 and arranged on left and right sides; Described top board 2 and first side plate 31, second side plate 32 all are vertically connected at described mainboard 1 front, and all adopt printed circuit board (PCB);
Radiating antenna unit 4 comprises: first monopole antenna 41 and second monopole antenna 42; This first monopole antenna 41 is printed on the front of described first side plate 31 that faces with described mainboard 1 front, and this second monopole antenna 42 is printed on the front of described second side plate 32 that faces with described mainboard 1 front;
Parasitic fold line structure twelve Earthly Branches 8, comprise: first parasitic fold line structure the twelve Earthly Branches 81 and second parasitic fold line structure twelve Earthly Branches 82, be printed in the back side and arranged on left and right sides of described top board 2 respectively, all adopt the fold line structure so that system compact, simultaneously again with described radiating antenna unit 4 common spread bandwidths, and metal ground 10 suspended;
Sheet metal 9, comprise: first sheet metal 91 and second sheet metal 92 that are positioned at described first side plate 31 back sides, and the 3rd sheet metal 93 and the 4th sheet metal 94 that are positioned at described second side plate 32 back sides, wherein, this first sheet metal 91 is printed on the bottom near described first side plate 31 in top board 2 left sides, and link to each other with metal ground 10, this second sheet metal 92 is printed on the top near described first side plate 31 in top board 2 left sides, and link to each other with the first parasitic fold line structure twelve Earthly Branches 81 in left side, top board 2 back sides, the 3rd sheet metal 93 is printed on the bottom near described second side plate 32 on top board 2 right sides, and link to each other with described metal ground 10, the 4th sheet metal 94 is printed on the top near described second side plate 32 on top board 2 right sides, and links to each other with the second parasitic fold line structure twelve Earthly Branches 82 on right side, top board 2 back side;
Dc bias circuit comprises: first dc bias circuit and second dc bias circuit, wherein:
First dc bias circuit is connected in sequence every AC inductance L1, first pad 111, first resistance R 1 and second pad 112 by being positioned at first below the described first feeder line branch 61, to control the break-make of the described first switching diode PIN1;
Second dc bias circuit is connected in sequence every AC inductance L2, the 3rd pad 113, second resistance R 2 and the 4th pad 114 by being positioned at second below the described second feeder line branch 62, to control the break-make of described second switch diode PIN2;
Described second pad 112, the 4th pad 114 connect power supply.
The present invention has multiband, compact conformation, advantage easy of integration, support direction figure restructural function, and be applicable to the particularly characteristics of the reconfigurable antenna structure of small size portable terminal of mobile communication terminal, and adopt the ordinary numbers circuit manufacturing process, manufacturing process is simple, and cost is low.
Description of drawings
Fig. 1 is the graphics (radiating element is the left-right symmetric structure) of a kind of three-dimensional broadband reconfigurable antenna system for portable terminal provided by the invention.
Fig. 2 is longitudinal sectional drawing for the A of Fig. 1 to view.
Fig. 3 is structure chart and the part embodiment dimensional drawing of microstrip feed line and direct current supply line on the mainboard front for the B of Fig. 1 to view, and unit is millimeter (mm).
Fig. 4 is structure and the part embodiment dimensional drawing (metal ground is the left-right symmetric structure) on the metal ground at the mainboard back side to view for the C of Fig. 1, and unit is millimeter (mm).
Fig. 5 is structure chart and the embodiment dimensional drawing (top board is the left-right symmetric structure) at the top board back side for the D of Fig. 1 to view, and unit is millimeter (mm).
Fig. 6 is structure chart and the part embodiment dimensional drawing (left plate and right plate are the left-right symmetric structure) of the sheet metal at the right plate back side to view for the E of Fig. 1, and unit is millimeter (mm).
Fig. 7 is structure chart and the embodiment dimensional drawing (left plate and right plate are the left-right symmetric structure) of the antenna element in right plate front to view for the F of Fig. 1, and unit is millimeter (mm).
Fig. 8 is the switching diode PIN1 conducting on the left side in the embodiment of Fig. 1, return loss (S parameter) figure when the switching diode PIN2 on the right disconnects.
Fig. 9 is the switching diode PIN2 conducting on the right in the embodiment of Fig. 1, return loss (S parameter) figure when the switching diode PIN1 on the left side disconnects.
The x-y plane that Figure 10 surveys when being operated in 2.13GHz for reconfigurable antenna and y-z planar radiation directional diagram:
Actual measurement directional diagram in x-y plane when being the switching diode PIN1 conducting in left side (10a);
Actual measurement directional diagram in x-y plane when being the switching diode PIN2 conducting on right side (10b);
Actual measurement directional diagram in x-z plane when being the switching diode PIN1 conducting in left side (10c);
Actual measurement directional diagram in x-z plane when being the switching diode PIN2 conducting on right side (10d).
The x-y plane that Figure 11 surveys when being operated in 2.34GHz for reconfigurable antenna and y-z planar radiation directional diagram:
Actual measurement directional diagram in x-y plane when being the switching diode PIN1 conducting in left side (11a);
Actual measurement directional diagram in x-y plane when being the switching diode PIN2 conducting on right side (11b);
Actual measurement directional diagram in x-z plane when being the switching diode PIN1 conducting in left side (11c);
Actual measurement directional diagram in x-z plane when being the switching diode PIN2 conducting on right side (11d).
The x-y plane that Figure 12 surveys when being operated in 2.62GHz for reconfigurable antenna and y-z planar radiation directional diagram:
Actual measurement directional diagram in x-y plane when being the switching diode PIN1 conducting in left side (12a);
Actual measurement directional diagram in x-y plane when being the switching diode PIN2 conducting on right side (12b);
Actual measurement directional diagram in x-z plane when being the switching diode PIN1 conducting in left side (12c);
Actual measurement directional diagram in x-z plane when being the switching diode PIN2 conducting on right side (12d).
Sign in the accompanying drawing is described as follows
1 is mainboard; 2 is top board; 31,32 be respectively left plate and right plate; 41,42 be respectively first monopole antenna and second monopole antenna; 5 is the wide microstrip feed line of 1.5mm; 61,62 be respectively the first feeder line branch and the second feeder line branch; 7 is the ground connection via hole; 81,82 be respectively the first parasitic fold line structure twelve Earthly Branches and the second parasitic fold line structure twelve Earthly Branches; 91,92 be respectively first sheet metal and second sheet metal that is positioned at the left plate back side; 93,94 be respectively the 3rd sheet metal and the 4th sheet metal that is positioned at the right plate back side; 10 for being positioned at the metal ground at the mainboard back side; 111,112,113,114,115 for being connected with the metal pad of dc wire; L1, L2, L3 are that 22nH is every AC inductance; C is the 100pF capacitance; PIN1, PIN2 are switching diode.
Embodiment
The present invention proposes a kind of three-dimensional broadband reconfigurable antenna system for portable terminal, and the three-dimensional structure schematic diagram as shown in Figure 1.Antenna structure is printed on that four dielectric constants are 4.4, thickness is on the FR4 dielectric-slab of 0.8mm, i.e. mainboard 1, top board 2, left plate 31 and right plate 32, and antenna system comprises radiating antenna unit, feeder line, DC power-supply circuit and metal ground.Wherein, radiating element comprises two monopole antenna unit 41,42, parasitic fold line structurally branch 81,82 and monopole antenna unit 41,42 actings in conjunction with spread bandwidth; Feeder system comprises 5,61,62, and wherein 61,62 difference direct feeds are used for selecting antenna element to adding two switching diode PIN1 and PIN2 between the monopole antenna unit 41,42,61,62 and 5.The DC control circuit of two PIN diode about below 61,62 being respectively comprises: metal pad 111～115, between 61,111 and connect the inductance of 22nH between 62,113 respectively, be used for preventing that alternating current from flowing into DC loop, and burn out power supply; Connect 100 ohm resistance between the pad 111,112 and between 113,114 respectively, be divider resistance; 112,113 is the power line pad, external direct voltage source; Connect the 22nH inductance between 115 and 5, be used for preventing that alternating current from flowing into DC loop; 7 is the ground connection via hole; Be metal ground 10 at the back side of mainboard.
It is that two monopole antenna unit 61,62 are got under the fixed situation substantially that technical scheme of the present invention is achieved in that at radiating element, parasitic fold line is branch 81,82 and monopole antenna unit 61,62 common decision bandwidth of operation structurally, wherein 81,82 mainly influence low frequency pass band, and 61,62 mainly influence the high frequency passband.The selection of antenna element is that the break-make by switching diode PIN1 and PIN2 realizes.
The present invention has following characteristics:
The first, in the present invention, the reconfigurable antenna system adopts stereochemical structure, antenna height that 6.5mm is only arranged and occupies seldom mainboard area, meets the requirement of portable terminal compactness, miniaturization.
Second, in the present invention, reconfigurable antenna has two kinds of working methods, the bandwidth of every kind of working method all can cover UMTS (1920-2170MHz), WiBro (2300-2400MHz), TD-LTE (2350-2370MHz), WLAN (2400-2484MHz), WiMAX (2500-2690) and TD-LTE (2570-2620) frequency band, and antenna pattern satisfies reconfigurable instructions for use in the band.
The 3rd, in the present invention, reconfigurable antenna is printed on the pcb board, makes simply, and cost is low.
The 4th, in the present invention, the DC power-supply circuit of PIN diode is simple in structure, easily realizes.
In order to illustrate that a kind of radio communication provided by the invention is special but be not limited to provide an instantiation below for the performance in the portable terminal reconfigurable antenna system of complex communication environment.
In this example, adopting dielectric substrate thickness is that 0.8mm, relative dielectric constant are 44, each several part size such as Fig. 3-and shown in Figure 7, the unit of all sizes is millimeter (mm) among the figure.
Return loss (S parameter) result such as Fig. 8 (switching diode PIN1 conducting) with Fig. 3-reconfigurable antenna that size shown in Figure 7 is made, shown in Fig. 9 (switching diode PIN2 conducting), though symmetrical configuration, but because the influence of antenna ends DC loop device and PIN diode, cause the S parameter not quite identical, as seen from the figure, the bandwidth of return loss during less than-10dB is 830MHz (1910-2740MHz), can cover UMTS (1920-2170MHz) fully, WiBro (2300-2400MHz), TD-LTE (2350-2370MHz), WLAN (2400-2484MHz), WiMAX (2500-2690) and TD-LTE (2570-2620) frequency band.Actual measurement antenna pattern when Figure 10, Figure 11, Figure 12 provide reconfigurable antenna respectively and be operated in 2.13GHz, 2.34GHz, 2.62GHz.As seen from the figure, this antenna system can realize the restructural of directional diagram, and because it is small-sized, is applicable to mobile communication terminal.
Claims (1)
1. be used for the three-dimensional broadband reconfigurable antenna system of portable terminal, it is characterized in that contain: dielectric-slab, radiating antenna unit, parasitic fold line be branch, microstrip feed line, sheet metal, metal ground and two dc bias circuits structurally, wherein:
Dielectric-slab, rectangular, amount to four: mainboard (1), be positioned at this mainboard (1) short brink top board (2), be positioned at the left and right long side of this mainboard (1) and be connected first side plate (31) and second side plate (32) of formation " П " font respectively with this top board (2) thereby and arranged on left and right sides; Described top board (2) all is vertically connected at described mainboard (1) front with first side plate (31), second side plate (32), and all adopts printed circuit board (PCB);
Radiating antenna unit (4) comprising: first monopole antenna (41) and second monopole antenna (42); This first monopole antenna (41) is printed on the front of described first side plate (31) that faces with described mainboard (1) front, and this second monopole antenna (42) is printed on the front of described second side plate (32) that faces with described mainboard (1) front;
Microstrip feed line (5), characteristic impedance is 50 ohm, be printed on the positive major axis of described mainboard (1), oppositely be connected on described first monopole antenna (41) after first switching diode (PIN1) by the left side, the first feeder line branch (61) successively, this microstrip feed line (5) oppositely is connected on described second monopole antenna (42) after the second switch diode (PIN2) by the right side, the second feeder line branch (62) more successively; Described two feeder line branches (61,62) are left and right described mainboard (1) fronts that is symmetrically distributed in, a corresponding monopole antenna feed during this microstrip feed line (5) comes optionally to described radiating antenna unit (4) by the break-make of controlling one of two described switching diode PIN, the middle gap of this microstrip feed line (5) meets a partiting dc capacitor C, connects near the feeder line position above this capacitance C behind AC inductance L3 again by hole (7), ground ground connection;
Parasitic fold line is branch (8) structurally, comprise: the first parasitic fold line is branch (81) and the second parasitic fold line (82) structurally structurally, be printed in the back side and arranged on left and right sides of described top board (2) respectively, all adopt the fold line structure so that system compact, simultaneously again with the common spread bandwidth in described radiating antenna unit (4), and metal ground (10) suspended;
Sheet metal (9), comprise: first sheet metal (91) and second sheet metal (92) that are positioned at described first side plate (31) back side, and the 3rd sheet metal (93) and the 4th sheet metal (94) that are positioned at described second side plate (32) back side, wherein, this first sheet metal (91) is printed on the bottom near described first side plate (31) in top board (2) left side, and link to each other with metal ground (10), this second sheet metal (92) is printed on the top near described first side plate (31) in top board (2) left side, and with the first parasitic fold line in top board (2) back side left side structurally branch (81) link to each other, the 3rd sheet metal (93) is printed on the bottom near described second side plate (32) on top board (2) right side, and link to each other with described metal ground (10), the 4th sheet metal (94) is printed on the top near described second side plate (32) on top board (2) right side, and with the second parasitic fold line on top board (2) right side, the back side structurally branch (82) link to each other;
Metal ground (10) is positioned at described mainboard (1) back side, is used for simulating mobile terminal other metal part except described radiating antenna unit (4);
Dc bias circuit comprises: first dc bias circuit and second dc bias circuit, wherein:
First dc bias circuit, be connected in sequence every AC inductance L1, first pad (111), first resistance R 1 and second pad (112) by being positioned at first below the described first feeder line branch (61), to control the break-make of described first switching diode (PIN1);
Second dc bias circuit, be connected in sequence every AC inductance L2, the 3rd pad (113), second resistance R 2 and the 4th pad (114) by being positioned at second below the described second feeder line branch (62), to control the break-make of described second switch diode (PIN2);
Described second pad (112), the 4th pad (114) connect power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102469852A CN102437419B (en) | 2011-08-24 | 2011-08-24 | Three-dimensional broadband reconfigurable antenna system for mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102469852A CN102437419B (en) | 2011-08-24 | 2011-08-24 | Three-dimensional broadband reconfigurable antenna system for mobile terminal |
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| CN102437419A CN102437419A (en) | 2012-05-02 |
| CN102437419B true CN102437419B (en) | 2013-08-21 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106532239B (en) * | 2016-12-23 | 2023-06-13 | 南京信息工程大学 | Nine-frequency-band reconfigurable antenna applicable to LTE & WWAN mobile user terminal |
| CN111987443A (en) * | 2020-08-12 | 2020-11-24 | 浙江金乙昌科技股份有限公司 | Miniaturized concatenation formula communication antenna |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431182A (en) * | 2008-12-17 | 2009-05-13 | 清华大学 | Reconfigurable antenna used for mobile terminal |
| CN101562273A (en) * | 2009-05-27 | 2009-10-21 | 上海交通大学 | Multi-frequency band built-in reconfigurable mobile terminal antenna |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100869754B1 (en) * | 2006-11-27 | 2008-11-21 | 한양대학교 산학협력단 | Reconfigurable multi-band antenna |
| GB0918477D0 (en) * | 2009-10-21 | 2009-12-09 | Univ Birmingham | Reconfigurable antenna |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431182A (en) * | 2008-12-17 | 2009-05-13 | 清华大学 | Reconfigurable antenna used for mobile terminal |
| CN101562273A (en) * | 2009-05-27 | 2009-10-21 | 上海交通大学 | Multi-frequency band built-in reconfigurable mobile terminal antenna |
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