CN110492232B - Multi-band covered four-antenna system applied to 5G mobile terminal - Google Patents
Multi-band covered four-antenna system applied to 5G mobile terminal Download PDFInfo
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- CN110492232B CN110492232B CN201910639576.5A CN201910639576A CN110492232B CN 110492232 B CN110492232 B CN 110492232B CN 201910639576 A CN201910639576 A CN 201910639576A CN 110492232 B CN110492232 B CN 110492232B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
Abstract
A four-antenna system applied to multi-band coverage of a 5G mobile terminal belongs to the field of antenna design and is characterized in that a first-class radiation unit covers frequency bands of LTE700, GSM850, GSM900, GPS, DCS, PCS, UMTS, LTE2300, LTE2500, band42 and the like. The second type of radiating element covers GPS, DCS, PCS, UMTS, LTE2300, LTE250, band42 and 5G IMS frequency bands. The coupling of two radiation units in the first type of radiation unit is decoupled through the absorption of two radiation units of the second type of radiation unit on the floor current, the interior of the second type of radiation unit is decoupled through the distance, and the upper and lower radiation units are decoupled through a matching circuit.
Description
Technical Field
The invention belongs to the field of antenna design of wireless communication technology, and relates to a multi-band covered four-antenna system applied to a 5G mobile terminal.
Background
The current society is an information explosion society, and currently is in the fourth generation mobile communication period, the fifth generation mobile communication system is being prepared to move forward, the different communication systems correspond to different communication frequencies, the 2G Global System for Mobile communications (GSM 850: 824-. In the future, for a long time, 2G/3G/4/5G mobile communication systems will coexist for a long time, for mobile terminals, the frequency bands to be covered are more and more, and the design of antennas is more and more difficult, for 5G communication, multiple antennas have become an inevitable trend, in an originally narrow terminal antenna design area, more antennas are needed to be made, so that the design of antennas is more difficult, for multiple antennas, the coupling between the antennas can have a very large influence on the communication quality, and the solution of the coupling between the multiple antennas is more and more urgent.
Through searching the patents of the antennas, it is found that there are few patents on the Four antennas, and a Four-antenna system capable of simultaneously covering DCS, PCS, UMTS, LTE2300 and LTE2500 is realized in patent No. CN103682596A, but the Four antennas cannot cover the frequency bands of LTE700, GSM850, GSM900, etc., and cannot cover the frequency bands of GPS and some 5G bands well, and more frequency bands are required to be covered for the future 5G multi-antenna, and documents [ Four LTE low-band handset antenna antennas and the same M IMO performance with user's hand present Kin-Lu Wong, etc. ], M icrowave Optical technologies Letters, volume 52, month 2016, 9 ], a dual antenna capable of simultaneously covering the Four antennas of GSM850 and GSM900 and LTE700 is realized, but there is no communication band 2500 for D CS, PCS, LTE, UMTS, 2300 and LTE, etc., and no more frequency bands of LTE 2500. Based on the above situation, the invention redesigns the antenna units on the basis of the thought of the patent [ CN103682596A ], designs two new antenna units, and removes the structure used for decoupling, thereby greatly simplifying the structure of the antenna, expanding the working frequency range covered by the antenna, and finally enabling four antennas to cover the frequency ranges of G PS, DCS, PCS, UMTS, LTE2300, LTE2500, band 24, band42, and the like, wherein 2 antennas can also cover the frequency ranges of LTE700, GSM850, GSM900, and the like, and the other two antennas can also cover the frequency range of 5G ISM.
Disclosure of Invention
The invention aims to design a multi-antenna for a mobile terminal with multi-band coverage for a fifth generation mobile communication system, which has the main advantages that the coverable working frequency band is greatly increased compared with the existing four-antenna system, and the decoupling structure can be simplified. The measured mutual coupling between the four antennas is less than-10 dB.
The invention relates to a multi-band covered four-antenna system applied to a 5G mobile terminal, which is characterized by comprising the following components: dielectric plate (1), metal ground (2), microstrip feed line, first type radiating element and second type radiating element, wherein:
a dielectric sheet (1) having a length, width and height of 153mm, 77mm and 0.8 mm;
a metal ground (2) located on the back surface of the dielectric plate (1), having a length × width of 153mm × 77mm, extending upward and downward 10mm in each direction along the top and bottom edges of the dielectric plate (1), extending horizontally 7.5mm along the left and right sides of the dielectric plate (1), and respectively represented by an upward extending portion (21), a downward extending portion (22), a leftward extending portion (23), and a rightward extending portion (24), wherein:
the upward extending part (21) is vertically arranged on the medium plate (1) after being turned upwards by 90 degrees along the top edge, and the upward extending part (21) is divided into three top rectangular extending strips which are not connected with each other, and the top rectangular extending strips are respectively represented by a top first rectangular extending strip (211), a top second rectangular extending strip (212) and a top third rectangular extending strip (213) from right to left along the direction of the top edge;
the downward extending part (22) is vertically arranged on the dielectric plate (1) after being turned upwards by 90 degrees along the bottom edge, and the downward extending part (22) is divided into three bottom end rectangular extending strips which are separated from each other from right to left along the direction of the bottom edge, wherein the three bottom end rectangular extending strips are respectively represented by a bottom end first rectangular extending strip (221), a bottom end second rectangular extending strip (222) and a bottom end third rectangular extending strip (223);
the leftward extending part (23) is turned upwards by 90 degrees by taking the left side edge as the axial direction and then is perpendicular to the dielectric slab (1), and the leftward extending part (23) is divided into three mutually separated left strip-shaped extending belts from top to bottom, which are respectively represented by a left first strip-shaped extending belt (231), a left second strip-shaped extending belt (232) and a left third strip-shaped extending belt (233) from top to bottom;
the right extending part (24) is turned upwards by 90 degrees by taking the right side as an axial direction and then is perpendicular to the dielectric slab (1), and the right extending part (24) is divided into three left strip-shaped extending belts which are mutually separated from top to bottom and respectively represented by a right first strip-shaped extending belt (241), a right second strip-shaped extending belt (242) and a right third strip-shaped extending belt (243) from top to bottom;
the upward extending part (21), the downward extending part (22), the leftward extending part (23) and the rightward extending part (24) are respectively turned over and welded along corners to jointly form a metal frame of the four-antenna system;
four microstrip feed lines, which are respectively represented as a first microstrip feed line (31), a second microstrip feed line (32), a third microstrip feed line (33) and a fourth microstrip feed line (34), are printed on the front surface of the dielectric plate (1) in a vertical line form from top to bottom and are respectively used for feeding an upper right radiation unit, an upper left radiation unit, a lower right radiation unit and a lower left radiation unit, the widths of the four microstrip feed lines are all 1.5mm, wherein,
the transverse width between the first microstrip feed line (31) and the second microstrip feed line (32) is equal to the width between the third microstrip feed line (33) and the fourth microstrip feed line (34);
2 first-type radiation units which are respectively positioned at the upper right radiation unit at the upper right corner of the dielectric slab (1) and the lower right radiation unit at the lower right corner of the dielectric slab (1), wherein:
an upper right radiating element comprising:
the medium plate (1) is provided with the following parts: a first type of inductive loading coupling feeder line (411) and a first type of inverse L-shaped feeder line (412) which is turned 180 degrees to the left, long branches of the first type of inductive loading coupling feeder line (411) are distributed along the horizontal direction, the right end face of the long branches is communicated with the left side face of the top of the first microstrip feeder line (31), an inductor used for enhancing the electrical length is further arranged on the long branches,
the dielectric plate (1) is characterized in that: a first rectangular strip (413), a second rectangular strip (414), a T-shaped inductance loading line (415) and a third rectangular strip (416), wherein the first rectangular strip (241) at the right side, the first rectangular strip at the top end (211) and the second rectangular strip at the top end (212) are arranged on the side surface of the dielectric plate,
a first rectangular strip (413) which is horizontally arranged, the upper end surface of which is vertically connected with a second rectangular extending strip (212) at the top end along the top edge of the medium plate (1),
a second rectangular strip (414), the top of the left side is connected with the right side of the first rectangular strip (413) through a horizontal large inductance loading line,
a T-shaped inductive loading line (415), the upper end face of which is perpendicular to the top second rectangular extending strip (212) along the top edge of the dielectric plate (1), and a gap is formed between the left side face and the right side face of the second rectangular strip (414),
a third rectangular strip (416) having an upper end surface adhered to the top end of the dielectric plate (1) and perpendicular to the top end first rectangular extension strip (211),
the bottom surfaces of the first rectangular strip (413), the second rectangular strip (414) and the T-shaped inductive loading line (415) are positioned on the same water surface line and are positioned at the same height with the bottom surface of the first type reverse L-shaped feeder line (412),
-in the upper right radiation unit (41):
the grounding branch section formed by the first type of inductive loading coupling feeder line (411), a T-shaped inductive loading line (415), a second rectangular extending belt (212) at the top end and a first rectangular strip (413) is used for covering a low frequency band,
the monopole branch section formed by the first type inverse L-shaped feeder line (412), the third rectangular strip (416), the top end first rectangular extension strip (211) and the right side first strip extension strip (241) is used for covering a high frequency band,
a lower right radiating element (42) comprising:
the dielectric plate (1) is provided with the following parts: a second inductively load coupled feed line (421), a first tuning line (423), and an "L" shaped feed line (422), wherein: the top end of the L-shaped feed line (422) is connected with the lower end face of the third microstrip feed line (33), the tail end of the L-shaped feed line (422) horizontally extends to the right lower corner side of the dielectric board (1) and is vertical to a right third strip-shaped extension strip (243), the right end of the second inductive loading coupling feed line (421) serving as a starting point is connected with the corner end of the L-shaped feed line (422), the second inductive loading coupling feed line (421) is wired from right to left along the horizontal direction and then horizontally turned back vertically and downwardly to a terminal point, the first tuning line (423) starts from the right side of the lower end of the third microstrip feed line (33), is wired from right along the horizontal direction and then reaches the right lower corner side of the dielectric board (1) and is vertical to the right third strip-shaped extension strip (243),
the dielectric plate (1) is provided with the following parts: a fourth rectangular strip (424), an "L" -shaped inductive loading line (425), a second rectangular extension strip (222) at the bottom end and a first rectangular extension strip (221) at the bottom end, and a third strip-shaped extension strip (243) at the right side, wherein: the bottom surface of the fourth rectangular strip (424) is attached to the bottom edge of the dielectric plate (1) and is perpendicular to the bottom end second rectangular extension strip (222), and the bottom edge of the L-shaped inductive loading line (425) is also attached to the bottom edge of the dielectric plate (1) and is also perpendicular to the bottom end second rectangular extension strip (222); the upper end face of the fourth rectangular strip (424) is parallel to the return line of the second inductive loading coupling feed line (421), the upper end face of a loading inductor at the tail end of the L-shaped inductive loading line (425) and the lower end face of the right third strip-shaped extension strip (243) are on the same horizontal line,
a lower right radiation unit (42), wherein a grounding branch formed by a second inductive loading coupling feed line (421), a fourth rectangular strip (424), an L-shaped inductive loading line (425) and a bottom end second rectangular extension band (222) is used for covering a low frequency band, a monopole branch formed by an L-shaped feed line (422), a first tuning line (423) and a bottom end first rectangular extension band (221) and a right side third rectangular extension band (243) is used for covering a high frequency band,
an upper left radiating element (51) comprising:
the front side of the medium plate (1) is provided with: a folded feed line (511), a second tuning line (512) and a first matching circuit (513) after an extension of a second microstrip feed line (32) perpendicularly intersects the right side of the second microstrip feed line (32), wherein: the folded feed line (511) horizontally extends rightwards and vertically folds upwards twice and then vertically intersects with the top edge of the dielectric plate (1), the second tuning line (512) vertically folds leftwards and then upwards twice and then vertically intersects with the first strip-shaped extension belt (231) on the left side of the dielectric plate (1),
a first rectangular small piece (516), a top third rectangular extension strip (213) positioned at the upper edge of the dielectric plate (1) and a first strip-shaped extension strip (231) positioned at the left side of the dielectric plate (1) are arranged at the back of the dielectric plate (1),
the bottom surface of the first rectangular small piece (516) is connected with the top end of the second micro-strip feed line (32) through a through hole, the first matching circuit (513) is composed of series capacitance loaded on the second micro-strip feed line (32) and lumped capacitance and inductance which are connected with the second micro-strip feed line (32) in parallel,
the folded feeder line (511), the second tuning line (512) and the third rectangular extension strip (213) at the top end form a monopole radiator, and the monopole radiator is used for covering a high frequency band and the first rectangular small piece (516) is used for covering an ISM5GHz frequency band with the help of a first matching circuit (513);
a lower left radiating element (52) comprising:
the dielectric plate (1) is provided with the following parts: a central inverted "L" shaped feed line (521), a third tuning line (522), a fourth tuning line (523), and a second matching circuit (524), wherein: the horizontal end of the central inverted 'L' -shaped feeder line (521) is connected with the right side of the extended part of the fourth microstrip feeder line (34) connected with the second matching circuit (524), the other end of the central inverted 'L' -shaped feeder line is vertically crossed with a bottom-end third rectangular extension strip (223) through the bottom edge of the dielectric plate (1), a third tuning line (522) is in an inverted 'L' -shape, the horizontal end of the third tuning line is vertical to the left side of the extended part of the fourth microstrip feeder line (34), the other end of the third tuning line is vertically crossed with the bottom-end third rectangular extension strip (223) at the bottom edge of the dielectric plate (1), a fourth tuning line (523) is respectively vertically crossed with the left-side third strip-shaped extension strip (233) and the left-right end of the fourth tuning line (522),
the dielectric plate (1) is provided with the following parts: a second rectangular small piece (527), a left third strip-shaped extension strip (233) positioned at the edge of the left lower corner of the dielectric plate (1) and a bottom third rectangular extension strip (223) positioned at the lower edge of the dielectric plate (1),
the center reverse L-shaped feeder line (521), the third tuning line (522), the third rectangular extension band (223) at the bottom end and the third strip-shaped extension band (233) on the left side form a monopole radiator, the monopole radiator is used for covering a high frequency band under the cooperation of a second matching circuit, and the second rectangular small piece (527) is used for covering an ISM5GHz frequency band.
Compared with the prior art, the invention has the following remarkable advantages:
compared with the existing four antennas, the four-antenna system applied to the 5G mobile terminal and covered by multiple frequency bands can cover more frequency bands, and the application background of the antenna system is a metal frame mobile phone, so that the antenna system has higher design difficulty compared with other antenna systems.
Drawings
FIG. 1 is a three-dimensional diagram of a four-antenna with multi-band coverage applied to a 5G mobile terminal according to the present invention
Fig. 2 is a plan expanded view of the four-antenna system shown in fig. 1.
Fig. 3 is a top view, the top view, of fig. 1, including four microstrip feed lines 31, 32, 33 and 34 on the dielectric board (1), a first type inductively loaded coupled feed line (411) of the upper right radiating element (41), a first type inverted "L" shaped feed line (412),
a second inductively loaded coupling feed line (421) of the lower right radiating element (42), "L" shaped feed line (422), a first tuning line (423),
a folded feed line (511) on the front side of the upper left radiating element (51), a second tuning line (512), a first matching circuit (513).
A central inverted 'L' -shaped feeder line (521) of a lower left radiating element (52), a third tuning line (522), a fourth tuning line (523), and a second matching circuit (524).
Fig. 4 is a backward view, which is a forward view, of fig. 1, and includes a metal floor (2) on the back of a dielectric slab (1), a first rectangular strip (413), a second rectangular strip (414), a T-shaped inductive loading branch (415), and a third rectangular strip (416) printed on the back of the dielectric slab, where the upper right radiating element (41) is printed on the back of the dielectric slab; a lower right radiating element (42) is printed on a fourth rectangular strip (424) on the back surface of the dielectric plate, and an L-shaped inductive loading line (425); a first rectangular patch (516) of the upper left radiating element (51) and a second rectangular patch (527) of the lower left radiating element (52).
Fig. 5 is a schematic plan view of the unfolded folded part, shown in gray, in units of millimeters (mm).
Fig. 6 is a detailed metal structure diagram and an embodiment size diagram of two radiation antenna elements printed above the front surface of a main dielectric plate in fig. 1, the metal of the front surface of the main dielectric plate is shown in black, the metal of the back surface of the main dielectric plate is not shown, and the units are all millimeters (mm).
Fig. 7 is a detailed metal structure diagram and an embodiment size diagram of two radiation antenna elements printed above the back surface of a main dielectric board in fig. 1, the metal of the front surface of the main dielectric board is shown in gray, the metal of the front surface of the main dielectric board is not shown, and the units are all millimeters (mm).
Fig. 8 is a detailed metal structure diagram and an embodiment size diagram of two radiation antenna elements printed under the front surface of the main dielectric plate in fig. 1, wherein the metal of the front surface of the main dielectric plate is shown in black, the metal of the back surface of the main dielectric plate is not shown, and the units are all millimeters (mm).
Fig. 9 is a detailed metal structure diagram and an embodiment size diagram of two radiation antenna elements printed under the back surface of a main dielectric plate in fig. 1, wherein the metal of the front surface of the main dielectric plate is shown in gray, the metal of the front surface of the main dielectric plate is not shown, and the units are all millimeters (mm).
Fig. 10 shows the measured reflection coefficients S11 and S33 of the first type of radiating element (4) of the four-antenna system of fig. 1-9.
Fig. 11 shows the measured reflection coefficients S22 and S44 of the second type of radiating element (5) of the four-antenna system of fig. 1-9.
Fig. 12 shows the measurement results of the coupling coefficients between the upper right and upper left radiating antenna elements of the four-antenna system, the coupling coefficients between the lower right radiating antenna element and the upper right radiating antenna element of the four-antenna system, and the coupling coefficients between the lower right radiating antenna element and the upper left radiating antenna element of the four-antenna system, i.e., S21, S31, S32, in the example of implementation of fig. 1-9.
Fig. 13 shows the results of measurements of the coupling coefficients between the lower left radiating antenna element and the upper right radiating antenna element of the four-antenna system, the coupling coefficients between the lower left radiating antenna element and the upper left radiating antenna element of the four-antenna system, and the coupling coefficients between the lower left radiating antenna element and the lower right radiating antenna element of the four-antenna system, i.e., S41, S42, and S43, in the example of implementation of fig. 1-9.
Fig. 14 shows the measured efficiency of the upper right radiating element (41) of the first type of radiating element for making antenna real objects with the dimensions shown in fig. 5-9.
Fig. 15 shows the measured efficiency of the lower right radiating element (42) of the first type of radiating element for making antenna embodiments in the dimensions shown in fig. 5-9.
Fig. 16 shows the measured efficiency of the upper left radiating element (51) of the second type of radiating element for making antenna real objects with the dimensions shown in fig. 5-9.
Fig. 17 is a graph of the measured efficiency of the lower left radiating element (52) of the second type of radiating element for making antenna material objects with the dimensions shown in fig. 5-9.
Detailed Description
The invention is further illustrated by the following figures and examples.
The invention provides a multi-band covered four-antenna system applied to a 5G mobile terminal, and realizes an antenna structure covered by multiple antennas and multiple bands under the condition of a metal frame. Fig. 1-9 show the specific structure and relative dimensions of an antenna, which is composed of a dielectric plate (1), a metal ground (2), a microstrip feed line, a first type of radiation element (4) and a second type of radiation element (5), wherein the size of the dielectric plate is 153mm × 77mm × 0.8 mm.
A metal ground (2) with the size of 133mm multiplied by 77mm is printed on the back surface of the dielectric plate, and four feeder lines, namely a first microstrip feeder line (31), a second microstrip feeder line (32), a third microstrip feeder line (33) and a fourth microstrip feeder line (34) are arranged on the upper right, the upper left and the lower right of the dielectric plate, and the sizes of the feeder lines are 40mm multiplied by 1.5 mm.
The four feeder lines are respectively connected with 4 radiating elements, namely, an upper right radiating element (41), a lower right radiating element (42), an upper left radiating element (51) and a lower left radiating element (52), and feeding points are respectively a first feeding point (71), a second feeding point (72), a third feeding point (73) and a fourth feeding point (74).
The upper right-corner radiation unit (41) is composed of a first inductive loading coupling feed line (411) located on the front face of the dielectric plate (1), an inverted L-shaped feed line (412), a first rectangular strip (413), a second rectangular strip (414), a T-shaped inductive loading line (415), a third rectangular strip (416), a top end second rectangular extension strip (212) perpendicular to the upper edge of the dielectric plate, and a right side first strip-shaped extension strip (241) perpendicular to the right side edge of the dielectric plate (1).
Wherein the first inductive load coupling feeder line (411) and the grounding branch section formed by the first rectangular strip (413), the T-shaped inductive load line (415) and the second rectangular extension band (212) at the top can cover the low frequency band; the single branch formed by the inverted 'L' -shaped feeder (412), the third rectangular strip (416), the first rectangular extension strip (211) at the top end and the first strip-shaped extension strip (241) at the right side is mainly used for covering the high frequency band.
Similarly, the lower right radiation unit (42) is composed of a second inductance loading coupling feed line (421) positioned on the front surface of the dielectric plate (1), an L-shaped feed line (422), a first tuning line (423), a fourth rectangular strip (424) positioned on the back surface of the dielectric plate (1), an L-shaped inductance loading line (425), a bottom end second rectangular extension strip (426) perpendicular to the upper edge of the dielectric plate, and a bottom end first rectangular extension strip (221) and a right side third strip extension strip (243) perpendicular to the right side edge of the dielectric plate (1). The grounding branch section formed by the second inductive loading coupling feeder line (421) and the fourth rectangular strip (424), the L-shaped inductive loading line (425) and the second rectangular extension strip (222) at the bottom end can cover a low frequency band; the monopole branch composed of the L-shaped feed line (422), the first tuning line (423), the first rectangular extension strip (221) at the bottom end and the third strip-shaped extension strip (243) at the right side is mainly used for covering a high frequency band.
And the upper left radiation unit (51) consists of a folded feed line (511) positioned on the front surface of the dielectric plate (1), a second tuning line (512), a first matching circuit (513), a first rectangular small piece (516) positioned on the back surface of the dielectric plate (1), a top end third rectangular extension strip (213) positioned on the upper edge of the dielectric plate (1) and a left side first strip-shaped extension strip (231) positioned on the left edge of the dielectric plate, wherein the extension part of the second microstrip feed line is also provided with the first matching circuit (513). The folded feed line (511), the second tuning line (512), the third rectangular extension band (213) at the top and the first rectangular extension band (231) on the left side form a monopole radiator, which can cover the high frequency band and the first rectangular patch (516) can cover the ISM5GHz band with the help of the first matching circuit (513).
And the lower left radiation unit (52) is composed of a central inverted L-shaped feed line (521) positioned on the front surface of the dielectric plate (1), a third tuning line (522), a fourth tuning line (523), a second matching circuit (524), a second rectangular small piece (527) positioned on the back surface of the dielectric plate (1), a bottom end third rectangular extension strip (223) positioned on the lower edge of the dielectric plate (1) and a folding line 10(222) positioned on the left edge of the dielectric plate. The center inverse L-shaped structure (521), the third tuning line (522), the third rectangular extension band (223) at the bottom end of the fourth tuning line (523) and the third strip-shaped extension band (233) on the left side form a monopole radiator, the monopole radiator can cover a high frequency band with the help of the second matching circuit (524), and the second rectangular patch (527) can cover an ISM5GHz frequency band.
The technical scheme of the invention is realized as follows:
radiation of antenna
First type radiating element (4)
The two radiation units are respectively positioned on an upper right radiation unit (41) and a lower right radiation unit (42) of the dielectric plate, and the two radiation units mainly comprise three parts for the radiation unit (41), namely a first-type inductive loading coupling feed line (411) comprises a first rectangular strip (413), a T-shaped inductive loading line (415) and a grounding branch formed by a top second rectangular extension strip (212), and a monopole branch formed by a reverse L-shaped feed line (412), a third rectangular strip (416) and a single branch formed by a top first rectangular extension strip (211) and a right first rectangular extension strip (241).
Wherein the first inductively loaded coupled feed line (411) and the ground stub are mainly used to cover the low frequency band (698) and 960 MHz); the single segment composed of the inverted 'L' -shaped feeder (412), the third rectangular strip (416), the top first rectangular extension strip (211) and the right first rectangular extension strip (241) is mainly used to cover 1450-.
And the lower right radiation unit (42) mainly comprises three parts, a second inductive loading coupling feeder line (421) and a rectangular strip 4(424), an L-shaped inductive loading line (425) and a ground branch formed by a folding line, and a monopole branch formed by an L-shaped feeder line (422), a first tuning line (423), a first rectangular extension strip (427) at the bottom end and a third strip extension strip (243) at the right side. Wherein the second inductively loaded coupled feed line (421) and the ground stub are used primarily to cover the low frequency band (698) and 960 MHz). The monopole branch section composed of the L-shaped feeder line (412), the first tuning line (423), the bottom first rectangular extension strip (427) and the right third strip extension strip (243) is mainly used for covering 1450-2690MHz and 3400-3600 MHz.
Radiation unit of the second kind (5)
The upper left corner radiation unit (51) is composed of a folded feed line (511) positioned on the front face of the dielectric plate (1), a second tuning line (512), an extension part of the second microstrip feed line, a matching circuit (513), a first rectangular small piece (516) positioned on the back face of the dielectric plate (1), a top end third rectangular extension strip (213) positioned on the upper edge of the dielectric plate (1) and a left side first strip extension strip ((231) positioned on the left edge of the dielectric plate, wherein the folded feed line (511), the second tuning line (512), the top end third rectangular extension strip (213) and the left side first strip extension strip ((231) form a monopole radiator, and the monopole radiator can cover 1545 + 3600MHz and the first rectangular small piece (516) can cover 5100 + 5900MHz with the help of the matching circuit (513).
And the lower left corner radiation unit (52) is composed of a central inverted L-shaped feed line (521) positioned on the front surface of the dielectric plate (1), a third tuning line (522), a fourth tuning line (523), a second matching circuit (524), a second rectangular small piece (527) positioned on the back surface of the dielectric plate (1), a bottom end third rectangular extension strip (223) positioned on the lower edge of the dielectric plate (1) and a left side third strip-shaped extension strip (233) positioned on the left edge of the dielectric plate. Wherein the central inverse L-shaped (521), the third tuning line (522), the fourth tuning line (523), the third rectangular extension strip (223) at the bottom end and the third strip-shaped extension strip (233) at the left side form a monopole radiator, the monopole radiator can cover 1545-3600MHz with the help of the second matching circuit (524), and the second rectangular patch (527) can cover 5100-5900 MHz.
Second, coupling of the antennas
For the direct coupling of the two radiation units of the first type of radiation unit (4), namely the upper right radiation unit (41) and the lower right radiation unit (42), the effect of decoupling is achieved through the absorption of the two radiation units of the second type of radiation unit (5), namely the upper left radiation unit (51) and the lower left radiation unit (52), are relatively far away from each other, the coupling between the upper right radiation unit (41) and the upper left radiation unit (51) is small, the direct distance decoupling is achieved, the coupling between the upper right radiation unit (41) and the upper left radiation unit (51) is decoupled through a matching circuit, and similarly, the coupling between the lower right radiation unit (42) and the lower left radiation unit (52) is also decoupled by the matching circuit.
The results of testing the reflection coefficient of the antenna fabricated with the dimensions shown in fig. 5-9 are shown in fig. 10-11. As can be seen from FIG. 10, the measured-5 dB impedance bandwidths of the two radiation units of the first type radiation unit (4) of the antenna, the upper right radiation unit (41), are 275MHz (685- & ltSUB & gt 960MHz) and 2500MHz (1.3-3.8GHz), the measured-5 dB impedance bandwidths of the lower right radiation unit (42), are 310MHz (670- & ltSUB & gt 980MHz), 1480MHz (1.34-2.82GHz) and 750MHz (3.2-3.95GHz), can cover the frequency bands of LTE700, GSM850, GSM900, DCS, PCS, UMTS, LTE2300, LTE2500, and band 24 and band 42.
As shown in fig. 11, the measured-5 dB impedance bandwidths of the two radiating elements of the second type of radiating element (5), i.e. the upper right radiating element (51) and the lower right radiating element (52), can cover the GPS, DCS, PCS, UMTS, LTE2300, LTE2500, band42 and ISM band 5G bands.
As shown in fig. 12 and 13, the four antennas of the four-antenna system are directly coupled in the LTE700, GSM850, GSM900, DCS, PCS, GPS, UMTS, LTE2300, LTE2500, and band 24 and band42 and ISM band 5G bands, which are less than-10 dB.
The measured efficiencies of the two radiating elements of the first type radiating element (4), namely the upper right radiating element (41) and the lower right radiating element (42), of the antenna manufactured with the dimensions shown in fig. 5-9 are shown in fig. 14 and 15. As can be seen from FIG. 14, the measured efficiency of the upper right radiating element (41) is mostly greater than-6 dB at the low frequency band, the part except the edge is between-6 and-7 dB, and the efficiency at the high frequency band is above-3 dB. As can be seen from FIG. 14, the measured efficiency of the upper right radiating element (41) is mostly greater than-3 dB at the low frequency band, the part except the edge is between-3.5 and-3 dB, and the efficiency at the high frequency band is greater than-3 dB.
The measured efficiencies of the two radiating elements of the second type of radiating element (5), namely the upper left radiating element (51) and the lower left radiating element (52), of the antenna made with the dimensions shown in fig. 5-9 are shown in fig. 16 and 17. As can be seen from fig. 16, the measured efficiency of the antenna in the high frequency band and the IMS band 5G is greater than-3.5 dB, and as can be seen from fig. 17, the measured efficiency of the antenna in the high frequency band and the IMS band 5G is greater than-3.5 dB.
The four-antenna system provided by the invention has higher gain and better radiation efficiency in a working frequency band, and meets the design requirements of a new generation of mobile communication system on multi-antenna metal frame and narrow frame mobile terminal antennas.
Claims (1)
1. A four-antenna system for multi-band coverage of a 5G mobile terminal, comprising: dielectric plate (1), metal ground (2), microstrip feed line, first type radiating element and second type radiating element, wherein:
a dielectric sheet (1) having a length, width and height of 153mm, 77mm and 0.8 mm;
a metal ground (2) located on the back surface of the dielectric plate (1), having a length × width of 153mm × 77mm, extending upward and downward 10mm in each direction along the top and bottom edges of the dielectric plate (1), extending horizontally 7.5mm along the left and right sides of the dielectric plate (1), and respectively represented by an upward extending portion (21), a downward extending portion (22), a leftward extending portion (23), and a rightward extending portion (24), wherein:
the upward extending part (21) is vertically arranged on the medium plate (1) after being turned upwards by 90 degrees along the top edge, and the upward extending part (21) is divided into three top rectangular extending strips which are not connected with each other, and the top rectangular extending strips are respectively represented by a top first rectangular extending strip (211), a top second rectangular extending strip (212) and a top third rectangular extending strip (213) from right to left along the direction of the top edge;
the downward extending part (22) is vertically arranged on the dielectric plate (1) after being turned upwards by 90 degrees along the bottom edge, and the downward extending part (22) is divided into three bottom end rectangular extending strips which are separated from each other from right to left along the direction of the bottom edge, wherein the three bottom end rectangular extending strips are respectively represented by a bottom end first rectangular extending strip (221), a bottom end second rectangular extending strip (222) and a bottom end third rectangular extending strip (223);
the leftward extending part (23) is turned upwards by 90 degrees by taking the left side edge as the axial direction and then is perpendicular to the dielectric slab (1), and the leftward extending part (23) is divided into three mutually separated left strip-shaped extending belts from top to bottom, which are respectively represented by a left first strip-shaped extending belt (231), a left second strip-shaped extending belt (232) and a left third strip-shaped extending belt (233) from top to bottom;
the right extending part (24) is turned upwards by 90 degrees by taking the right side edge as the axial direction and then is vertical to the dielectric slab (1), and the right extending part (24) is divided into three right strip-shaped extending belts which are mutually separated from top to bottom and respectively represented by a right first strip-shaped extending belt (241), a right second strip-shaped extending belt (242) and a right third strip-shaped extending belt (243) from top to bottom;
the upward extending part (21), the downward extending part (22), the leftward extending part (23) and the rightward extending part (24) are respectively turned over and welded along corners to jointly form a metal frame of the four-antenna system;
four microstrip feed lines, which are respectively represented as a first microstrip feed line (31), a second microstrip feed line (32), a third microstrip feed line (33) and a fourth microstrip feed line (34), are printed on the front surface of the dielectric plate (1) in a vertical line form from top to bottom and are respectively used for feeding an upper right radiation unit, an upper left radiation unit, a lower right radiation unit and a lower left radiation unit, the widths of the four microstrip feed lines are all 1.5mm, wherein,
the transverse width between the first microstrip feed line (31) and the second microstrip feed line (32) is equal to the width between the third microstrip feed line (33) and the fourth microstrip feed line (34);
2 first-type radiation units which are respectively positioned at the upper right radiation unit at the upper right corner of the dielectric slab (1) and the lower right radiation unit at the lower right corner of the dielectric slab (1), wherein:
an upper right radiating element comprising:
the medium plate (1) is provided with the following parts: a first type of inductive loading coupling feeder line (411) and a first type of inverse L-shaped feeder line (412) which is turned 180 degrees to the left, long branches of the first type of inductive loading coupling feeder line (411) are distributed along the horizontal direction, the right end face of the long branches is communicated with the left side face of the top of the first microstrip feeder line (31), an inductor used for enhancing the electrical length is further arranged on the long branches,
the dielectric plate (1) is characterized in that: a first rectangular strip (413), a second rectangular strip (414), a T-shaped inductance loading line (415) and a third rectangular strip (416), wherein the first rectangular strip (241) at the right side, the first rectangular strip at the top end (211) and the second rectangular strip at the top end (212) are arranged on the side surface of the dielectric plate,
a first rectangular strip (413) which is horizontally arranged, the upper end surface of which is vertically connected with a second rectangular extending strip (212) at the top end along the top edge of the medium plate (1),
a second rectangular strip (414), the top of the left side is connected with the right side of the first rectangular strip (413) through a horizontal large inductance loading line,
a T-shaped inductive loading line (415), the upper end face of which is perpendicular to the top second rectangular extending strip (212) along the top edge of the dielectric plate (1), and a gap is formed between the left side face and the right side face of the second rectangular strip (414),
a third rectangular strip (416) having an upper end surface adhered to the top end of the dielectric plate (1) and perpendicular to the top end first rectangular extension strip (211),
the bottom surfaces of the first rectangular strip (413), the second rectangular strip (414) and the T-shaped inductive loading line (415) are positioned on the same water surface line and are positioned at the same height with the bottom surface of the first type reverse L-shaped feeder line (412),
-in the upper right radiation unit (41):
the grounding branch section formed by the first type of inductive loading coupling feeder line (411), a T-shaped inductive loading line (415), a second rectangular extending belt (212) at the top end and a first rectangular strip (413) is used for covering a low frequency band,
the monopole branch section formed by the first type inverse L-shaped feeder line (412), the third rectangular strip (416), the top end first rectangular extension strip (211) and the right side first strip extension strip (241) is used for covering a high frequency band,
a lower right radiating element (42) comprising:
the dielectric plate (1) is provided with the following parts: a second inductively load coupled feed line (421), a first tuning line (423), and an "L" shaped feed line (422), wherein: the top end of the L-shaped feed line (422) is connected with the lower end face of the third microstrip feed line (33), the tail end of the L-shaped feed line (422) horizontally extends to the right lower corner side of the dielectric board (1) and is vertical to a right third strip-shaped extension strip (243), the right end of the second inductive loading coupling feed line (421) serving as a starting point is connected with the corner end of the L-shaped feed line (422), the second inductive loading coupling feed line (421) is wired from right to left along the horizontal direction and then horizontally turned back vertically and downwardly to a terminal point, the first tuning line (423) starts from the right side of the lower end of the third microstrip feed line (33), is wired from right along the horizontal direction and then reaches the right lower corner side of the dielectric board (1) and is vertical to the right third strip-shaped extension strip (243),
the dielectric plate (1) is provided with the following parts: a fourth rectangular strip (424), an "L" -shaped inductive loading line (425), a second rectangular extension strip (222) at the bottom end and a first rectangular extension strip (221) at the bottom end, and a third strip-shaped extension strip (243) at the right side, wherein: the bottom surface of the fourth rectangular strip (424) is attached to the bottom edge of the dielectric plate (1) and is perpendicular to the bottom end second rectangular extension strip (222), and the bottom edge of the L-shaped inductive loading line (425) is also attached to the bottom edge of the dielectric plate (1) and is also perpendicular to the bottom end second rectangular extension strip (222); the upper end face of the fourth rectangular strip (424) is parallel to the return line of the second inductive loading coupling feed line (421), the upper end face of a loading inductor at the tail end of the L-shaped inductive loading line (425) and the lower end face of the right third strip-shaped extension strip (243) are on the same horizontal line,
a lower right radiation unit (42), wherein a grounding branch formed by a second inductive loading coupling feed line (421), a fourth rectangular strip (424), an L-shaped inductive loading line (425) and a bottom end second rectangular extension band (222) is used for covering a low frequency band, a monopole branch formed by an L-shaped feed line (422), a first tuning line (423) and a bottom end first rectangular extension band (221) and a right side third rectangular extension band (243) is used for covering a high frequency band,
an upper left radiating element (51) comprising:
the front side of the medium plate (1) is provided with: a folded feed line (511), a second tuning line (512) and a first matching circuit (513) after an extension of a second microstrip feed line (32) perpendicularly intersects the right side of the second microstrip feed line (32), wherein: the folded feed line (511) horizontally extends rightwards and vertically folds upwards twice and then vertically intersects with the top edge of the dielectric plate (1), the second tuning line (512) vertically folds leftwards and then upwards twice and then vertically intersects with the first strip-shaped extension belt (231) on the left side of the dielectric plate (1),
a first rectangular small piece (516), a top third rectangular extension strip (213) positioned at the upper edge of the dielectric plate (1) and a first strip-shaped extension strip (231) positioned at the left side of the dielectric plate (1) are arranged at the back of the dielectric plate (1),
the bottom surface of the first rectangular small piece (516) is connected with the top end of the second micro-strip feed line (32) through a through hole, the first matching circuit (513) is composed of series capacitance loaded on the second micro-strip feed line (32) and lumped capacitance and inductance which are connected with the second micro-strip feed line (32) in parallel,
the folded feeder line (511), the second tuning line (512) and the third rectangular extension strip (213) at the top end form a monopole radiator, and the monopole radiator is used for covering a high frequency band and the first rectangular small piece (516) is used for covering an ISM5GHz frequency band with the help of a first matching circuit (513);
a lower left radiating element (52) comprising:
the dielectric plate (1) is provided with the following parts: a central inverted "L" shaped feed line (521), a third tuning line (522), a fourth tuning line (523), and a second matching circuit (524), wherein: the horizontal end of the central inverted 'L' -shaped feeder line (521) is connected with the right side of the extended part of the fourth microstrip feeder line (34) connected with the second matching circuit (524), the other end of the central inverted 'L' -shaped feeder line is vertically crossed with a bottom-end third rectangular extension strip (223) through the bottom edge of the dielectric plate (1), a third tuning line (522) is in an inverted 'L' -shape, the horizontal end of the third tuning line is vertical to the left side of the extended part of the fourth microstrip feeder line (34), the other end of the third tuning line is vertically crossed with the bottom-end third rectangular extension strip (223) at the bottom edge of the dielectric plate (1), a fourth tuning line (523) is respectively vertically crossed with the left-side third strip-shaped extension strip (233) and the left-right end of the fourth tuning line (522),
the dielectric plate (1) is provided with the following parts: a second rectangular small piece (527), a left third strip-shaped extension strip (233) positioned at the edge of the left lower corner of the dielectric plate (1) and a bottom third rectangular extension strip (223) positioned at the lower edge of the dielectric plate (1),
the center reverse L-shaped feeder line (521), the third tuning line (522), the third rectangular extension band (223) at the bottom end and the third strip-shaped extension band (233) on the left side form a monopole radiator, the monopole radiator is used for covering a high frequency band under the cooperation of a second matching circuit, and the second rectangular small piece (527) is used for covering an ISM5GHz frequency band.
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