CN109742515A - A millimeter-wave circularly polarized antenna for mobile terminals - Google Patents

Abstract

The invention discloses a millimeter-wave circularly polarized antenna for a mobile terminal, which comprises a magnetic dipole antenna unit based on a semi-open substrate integrated waveguide resonant cavity and a substrate integrated waveguide as a power feed balun. The dipole antenna unit is formed by pressing the magnetic dipole antenna unit and the electric dipole antenna unit. The invention has the characteristics of end-fire radiation in performance and can improve circularly polarized radiation, and has the advantages of low profile, light material, easy integration and conformal convenience in structure; When the terminal equipment is installed, the terminal radiation signal covers more than the hemispherical space.

Description

A kind of millimeter wave circular polarized antenna for mobile terminal

Technical field

The present invention relates to a kind of millimeter wave circular polarized antennas for mobile terminal, belong to wireless communication technology field.

Background technique

The performance of one of important devices as wireless communication system, millimeter wave antenna or aerial array, which directly determines, is It unites accessible performance standard.And for terminal device, its used antenna is more required, in addition to being able to satisfy traditional bandwidth and increasing Outside beneficial index, it is also necessary to have the features such as miniaturization, broad beam covering；Particularly, if the antenna can also have end-fire radiation Characteristic can then bring more raising capacity usage ratios, reduce the additional benefit of interference etc. between antenna and equipment internal circuit Place.

Circularly polarised wave is because of its unique advantage in terms of fighting channel disturbance and dual-mode antenna, in many applied fields Conjunction receives favor, realizes that the end-fire radiation of circular polarisation is also current research hotspot in millimeter wave frequency band.

For the mobile terminals application scenarios such as mobile phone or tablet computer, the ability that covers all around of signal radiation also has very much Practical significance.However single antenna or single antenna array are used, hand-held terminal device signal is not able to satisfy entire three The demand that dimension space upper half spherical surface covers all around.For this practical problem, up to the present there are no specific solutions for industry Certainly scheme, but with the quickly development of millimeter-wave communication system, propose that a kind of terminal device signal radiation covers all around solution The necessity and practical significance of scheme are self-evident.

Summary of the invention

The object of the invention is in order to solve the immature of prior art and what is provided a kind of can be integrated in terminal Millimeter wave circular polarized antenna in equipment has end-fire radiation characteristic in performance and can mention circular polarization radiation, has in structure There is low profile, lightweight material, easy of integration and conformal convenient；Particularly, it is being applied to the movement such as mobile phone or tablet computer eventually When in end equipment, making the covering of terminal radiation signal is more than hemispherical space.

In order to solve the above technical problems, the present invention provides a kind of millimeter wave circular polarized antenna for mobile terminal, packet Include a magnetic-dipole antenna unit and a substrate integration wave-guide conduct based on semi open model substrate integration wave-guide resonant cavity The electrical dipole antenna unit of feed Balun is laminated simultaneously by the magnetic-dipole antenna unit and electrical dipole antenna unit It is applied in combination to form millimeter wave circular polarized antenna.

Further, the substrate integration wave-guide resonant cavity that the radiation of the magnetic-dipole antenna unit is opened on one side by one It is formed, the substrate integration wave-guide resonant cavity is by probe feed；

The radiation of the electrical dipole antenna unit is formed by printing a period of time, which passes through substrate integration wave-guide structure At balun fed.

Further, one or more sizes identical printing a period of time is arranged in the electrical dipole antenna unit, and passes through gold Categoryization via hole is attached.

Further, the invention also includes microstrip lines, and two for obtaining constant amplitude and specific difference by the microstrip line swash It encourages, motivates magnetic-dipole antenna unit and electrical dipole antenna unit respectively.

Further, the probe is realized by metallization VIA.

Further, the magnetic-dipole antenna unit includes first medium plate, to be separately positioned on first medium plate upper and lower First metal floor, the second metal floor and the first metallization VIA group being contained in first medium plate on surface, this first Plated through-hole group constitutes semi open model substrate integration wave-guide resonant cavity；

The electrical dipole antenna unit further includes second medium plate, the third metal that second medium plate upper surface is arranged in Floor and the second metallization VIA group being contained in second medium plate, the second metallization VIA group constitute substrate integration wave-guide Feed Balun；

The microstrip line is contained in second medium plate lower surface, and the signal transmitted in microstrip line passes through microstrip line and Change-over knot Structure is coupled into feeding substrate integrated waveguide balun, enters semi open model substrate integration wave-guide resonant cavity by probe.

Further, an area of knockout for being greater than probe projected area, the digging are offered on second metal floor The position of empty region is corresponding with probe setting position.

Further, antenna of the invention is mounted on each orientation of mobile terminal device.

The utility model has the advantages that the end-fire circle polarized millimeter wave of the invention based on magnetic dipole radiation and electric dipole radiating composite Antenna has the following characteristics that

1, there is end-fire antenna pattern.Magnetic-dipole antenna has end-fire characteristic, and the face E directional diagram is wide, can provide vertical Polarized radiation signal, electrical dipole antenna have end-fire characteristic, and the face H directional diagram is wide, can provide the radiation letter of horizontal polarization Number, while promoting antenna performance using the metal outer frame of the mobile terminals such as mobile phone, solve metal outer frame shielding millimeter wave letter Number bottleneck problem；Its radiation of antenna of the invention is generated by the opening side of integrated wave guide resonance chamber, so being able to achieve The directed radiation of the waveguide direction of propagation.

2, the characteristic with low profile, the covering of easy of integration and broad beam, a left side for equipment is respectively arranged in using Third Mate's antenna Side, right side and upside can satisfy three-dimensional space signal covering demand of the terminal device more than hemisphere, wherein main space region Meet circular polarization characteristics.

3, structure is simple, handling ease, and because being made on dielectric substrate, using PCB technology, so antenna profile It is low, light-weight, be conducive to mass production, easy of integration in terminal device.

Detailed description of the invention

Fig. 1 is the tomograph of end-fire circular polarized antenna of the present invention；

In figure, 1 is the first metal floor, 2 be the second metal floor, 3 be third metal floor, 4 be first to metallize Kong Qun, 5 be probe, 6 be the second metallization VIA group, 7 be metallization VIA, 8 be printing a period of time, 9 be first medium plate, 10 be Second medium plate, 11 be microstrip line, 13 be circular polarized antenna, 14 be mobile terminal device；

Fig. 2 is metallic vias position view in end-fire circular polarized antenna of the present invention；

Fig. 3 is electric dipole irradiation structure schematic diagram of the present invention；

Fig. 4 is magnetic dipole radiation structural schematic diagram of the present invention；

Fig. 5 is the bottom lying copper region domain schematic diagram of end-fire circular polarized antenna of the present invention；

Fig. 6 is that mobile phone terminal utilizes end-fire circular polarized antenna (Third Mate) of the present invention to realize that millimetre-wave attenuator signal is more than hemisphere The covering scheme of three-dimensional space；

Fig. 7 is the S parameter design result of end-fire circular polarized antenna of the present invention；

Fig. 8 is result in Phi=90 ° of face of design direction figure of end-fire circular polarized antenna of the present invention；

Specific embodiment

The present invention is further explained with reference to the accompanying drawing.

As illustrated in fig. 1 and 2, the present invention is a kind of millimeter wave end-fire circular polarized antenna, it includes one and is based on semi open model The electric dipole of the magnetic-dipole antenna unit of substrate integration wave-guide resonant cavity and a substrate integration wave-guide as feed Balun Antenna element, semi open model substrate integration wave-guide resonant cavity are integrated in first medium plate 9, and substrate integration wave-guide is as feed Balun Electric dipole radiation be integrated in second medium plate 10, first medium plate 9 is top dielectric plate, and second medium plate 10 is that lower layer is situated between Scutum, antenna structure of the invention are that two layers of dielectric-slab is laminated.

By this antenna applications when terminal device millimetre-wave attenuator, proposed adoption Third Mate's antenna is mounted on the upside of terminal device Face, left side and right side are respectively intended to realize the signal covering in three top of terminal device, the left and right directions.It borrows The combination for helping magnetic dipole and electric dipole is able to achieve three-dimensional space signal covering demand of the terminal device more than hemisphere, Middle main space region meets circular polarization characteristics.

Fig. 3 is electrical dipole antenna unit, and the radiation of the electrical dipole antenna is formed by printing a period of time 8, and printing a period of time 8 is logical The balun for crossing substrate integration wave-guide composition is fed, and second medium plate 10, dielectric board material Taconic are specifically included TLY-5 is provided with third metal floor 3 in the upper surface of second medium plate 10, is contained in second medium with a thickness of 0.254mm The second metallization VIA group 6 in plate 10 constitutes feeding substrate integrated waveguide balun, the hole week of the second metallization VIA group 6 Phase is 0.5mm, constitutes the feeding substrate integrated waveguide balun that width is 4.9mm.Micro-strip is equipped in 10 lower surface of second medium plate Line 11, the signal transmitted in microstrip line 11 are coupled into feeding substrate integrated waveguide balun by microstrip line 11 and transformational structure. In irradiation structure, it is connected positioned at 10 two sides of second medium plate, with printing a period of time 8 of size by metallization VIA 7, to increase work Make bandwidth, wherein metallization VIA 7 is located at one end centerline in printing a period of time 8.

Fig. 4 is magnetic-dipole antenna unit, the semi open model substrate that the radiation of magnetic-dipole antenna is opened on one side by one Integrated wave guide resonance chamber is formed, and specifically includes first medium plate 9, and material is Taconic TLY-5, with a thickness of 1.524mm, The upper and lower surfaces of the first medium plate 9 are respectively arranged with the first metal floor 1 and the second metal floor 2.It is contained in The first metallization VIA group 4 in layer dielectric-slab constitutes semi open model substrate integration wave-guide resonant cavity, constitutes semi open model base The metallization VIA diameter of piece integrated wave guide resonance chamber is 0.5mm, and the hole period of the first plated through-hole group 4 is 0.75mm, structure At semi open model substrate integration wave-guide resonant cavity width be 6.4mm.Semi open model substrate integration wave-guide resonant cavity is by being located at half The central axis of open substrate integration wave-guide resonant cavity and probe 5 at the 3.95mm of resonant cavity bottom edge is fed, the probe 5 by The metallization VIA that diameter is 0.5mm is realized, and is 0.8mm by width, and dielectric thickness is that the microstrip line of 0.254mm is connected to Microwave adapter, All Media material select Taconic TLY-5.

The signal transmitted in microstrip line is coupled into semi open model substrate integration wave-guide resonant cavity by probe 5.Second In metal floor 2, there is one piece of area of knockout for being slightly larger than 5 projected area of probe in 5 position corresponding position of probe, short to avoid signal Road.

When being shaped to circular polarization radiation using magnetic-dipole antenna and electrical dipole antenna group, pass through one-to-two micro-strip function Two excitations for being divided to the microstrip line of device output end to realize constant amplitude and specific difference, motivate electrically and magnetically dipole antenna, in turn respectively Obtain desired circular polarisation end-fire effect.

It is illustrated in figure 6 upper side, left side and the right side that mobile terminal device 14 is mounted on using Third Mate's antenna 13, It is respectively intended to realize the signal covering of three top, the left and right directions of terminal device.By means of the invention antenna direction Figure can satisfy three-dimensional space signal covering demand of the terminal device more than hemisphere in the broad beam characteristic of an interarea, wherein Main space region meets circular polarization characteristics.

Antenna impedance bandwidth simulation result can reach 17% or so as seen from Figure 7, cover the 24.75GHz of 5G frequency range extremely 27.5GHz range.Fig. 8 is the directional diagram in Phi=90 ° of face of antenna, it can be seen that the antenna has good in end-on direction Wide-angle covering power and cross-polarization levels.

Claims (8)

1. a millimeter-wave circularly polarized antenna for mobile terminal, is characterized in that: comprise a magnetic dipole antenna unit based on semi-open substrate integrated waveguide resonant cavity and a substrate integrated waveguide as feeding balun The electric dipole antenna unit is laminated by the magnetic dipole antenna unit and the electric dipole antenna unit and used in combination to form a millimeter-wave circularly polarized antenna. 2 . The millimeter-wave circularly polarized antenna for a mobile terminal according to claim 1 , wherein the radiation of the magnetic dipole antenna unit is resonated by a semi-open substrate integrated waveguide with one side open. 3 . A cavity is formed, and the semi-open substrate integrated waveguide resonant cavity is fed by a probe (5); The radiation of the electric dipole antenna unit is formed by a printed element (8), which is fed through a balun formed by a substrate-integrated waveguide. 3. A kind of millimeter-wave circularly polarized antenna for mobile terminal according to claim 2, is characterized in that: described electric dipole antenna unit is provided with 1 or more printing elements (8) of the same size, And connect through metallized vias (7). 4. A kind of millimeter-wave circularly polarized antenna for a mobile terminal according to claim 1 or 2, characterized in that: further comprising a microstrip line, through which two of equal amplitude and specific phase difference are obtained Excitation, the magnetic dipole antenna element and the electric dipole antenna element are excited respectively. 5 . The millimeter-wave circularly polarized antenna for a mobile terminal according to claim 2 , wherein the probe ( 5 ) is realized by a metallized via hole. 6 . 6 . The millimeter-wave circularly polarized antenna for a mobile terminal according to claim 4 , wherein the magnetic dipole antenna unit comprises a first dielectric plate ( 9 ), which is respectively arranged on the first dielectric plate. 7 . A first metal floor (1), a second metal floor (2) on the upper and lower surfaces of the board (9), and a first group of metallized vias (4) contained in the first dielectric board (9), the first The metallized hole group (4) constitutes a semi-open substrate integrated waveguide resonant cavity; The electric dipole antenna unit further comprises a second dielectric plate (10), a third metal floor (3) disposed on the upper surface of the second dielectric plate (10), and a third metal floor (3) contained in the second dielectric plate (10). Two metallized via groups (6), the second metallized via group (6) constitutes a substrate-integrated waveguide feeding balun; The microstrip line (11) is accommodated on the lower surface of the second dielectric plate (10), and the signal transmitted in the microstrip line is coupled into the substrate-integrated waveguide feeding balun through the microstrip line and the conversion structure, and passes through the probe (5). ) into the semi-open substrate integrated waveguide resonator. 7. The millimeter-wave circularly polarized antenna for a mobile terminal according to claim 6, characterized in that: on the second metal floor (2), a dimple larger than the projected area of the probe (5) is provided. The hollow area, the position of the hollow area corresponds to the setting position of the probe (5). 8. The millimeter-wave circularly polarized antenna for a mobile terminal according to claim 1, characterized in that: it is installed in each position of the mobile terminal device.