CN108183329B - Low-profile unidirectional radiation differential ultra-wideband antenna - Google Patents
Low-profile unidirectional radiation differential ultra-wideband antenna Download PDFInfo
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- CN108183329B CN108183329B CN201810009520.7A CN201810009520A CN108183329B CN 108183329 B CN108183329 B CN 108183329B CN 201810009520 A CN201810009520 A CN 201810009520A CN 108183329 B CN108183329 B CN 108183329B
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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
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- 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
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Abstract
A low-profile unidirectional radiation differential ultra-wideband antenna is an antenna in the field of wireless communication and comprises a bidirectional radiation differential ultra-wideband antenna and a packaging cavity, wherein the bidirectional radiation differential ultra-wideband antenna comprises a left feed patch, a right feed patch, a rectangular dielectric substrate and a ground plate; the packaging cavity comprises a packaging ground, a short circuit through hole, a radiation edge shielding through hole, a non-radiation edge shielding through hole, a shielding metal belt, an impedance matching through hole and an impedance matching circular plate; the upper end of the packaging cavity is connected to the grounding plate, and the lower end of the packaging cavity is connected with the packaging ground; the lower ends of the radiation edge and the non-radiation edge shielding through hole are connected to the packaging ground, and the upper ends of the radiation edge and the non-radiation edge shielding through hole are suspended in the air; the impedance matching via hole is positioned in the packaging cavity, the lower end of the impedance matching via hole is connected with the packaging ground, and the upper end of the impedance matching via hole is suspended. According to the invention, the shielding through hole and the shielding metal belt are additionally arranged on the radiation side and the non-radiation side, so that the unidirectional radiation of the antenna is realized, and the ultra-wideband operation of the antenna is realized. The height of the whole packaging cavity is 1/10 of the wavelength at the lowest working frequency, so that the height of the whole antenna is greatly reduced, and the volume of the whole antenna is reduced.
Description
Technical Field
The invention relates to an antenna in the field of wireless communication, in particular to a low-profile unidirectional radiation differential ultra-wideband antenna.
Background
With the rapid development of wireless communication, communication systems such as global positioning systems, satellite communication, and personal communication have made higher demands for wide frequency bands and miniaturization of antennas. The Ultra Wide Band (Ultra Wide Band) communication technology is widely applied to the aspects of communication, radar, military and the like due to the advantages of large bandwidth, high transmission rate, strong anti-interference performance, strong anti-multipath capability and the like.
In recent years, various ultrawideband antennas have been proposed by various researchers, such as Single-layer differential CPW-FED UWB antenna with common-mode and band-not-accessed applications (Liang Lu, et al., "Microwave & Optical Technology Letters, 2017, 59 (1): 73-77); differential MIMO Antennas for ultra-wideband systems (y.y. Liu et al, "Compact Differential Band-Notched-Slot UWB-MIMO Antenna With Common-Mode Suppression", IEEE Antennas and Wireless transmission Antennas, 16, (2017), 593-. Many current ultra wide band antennas are two-way radiation, need to hang and place its radiation characteristic just can guarantee to it, when putting it on the object, its impedance characteristic and radiation performance can worsen, consequently need encapsulate it. To ensure the radiation characteristic, the height of the packaging cavity is generally 1/4 of the wavelength at the working frequency of the antenna, and the packaging cavity has a high section and a large volume.
Disclosure of Invention
In order to solve the problems that the existing ultra-wideband antenna needs to be placed in the air and the height of a common packaging cavity is too high, the invention provides a miniaturized, low-profile and unidirectional-radiation ultra-wideband antenna which not only has good broadband impedance characteristics, but also has a lower profile and higher gain.
The concept of the invention is as follows: a low-profile unidirectional radiation differential ultra-wideband antenna is characterized in that the height of a packaging cavity is reduced, and the impedance characteristic and the radiation characteristic of the antenna are deteriorated after the height is reduced. Therefore, the four walls of the packaging cavity are designed into a semi-closed tuning structure, so that the packaging cavity can play a shielding role and adjust the impedance characteristic of the antenna, and meanwhile, the middle cavity is utilized to increase an impedance matching link, so that the impedance bandwidth characteristic is further improved, and the volume of the antenna cannot be increased. The height of the achieved unidirectional radiation antenna is only 1/10 of the wavelength of the lowest working frequency, and the impedance characteristic is improved while the radiation performance is improved.
The invention is realized by adopting the following technical scheme:
the low-profile unidirectional radiation differential ultra-wideband antenna comprises a bidirectional radiation differential ultra-wideband antenna and a packaging cavity, and is characterized in that the bidirectional radiation differential ultra-wideband antenna comprises a left feed patch, a right feed patch, a rectangular dielectric substrate and a ground plate, wherein the left feed patch and the right feed patch are symmetrical about an x axis and are positioned below the rectangular dielectric substrate, and the left feed patch and the right feed patch are respectively composed of a microstrip line, a stub line, a rectangular metal patch and a semicircular patch; the left feed patch is symmetrical about the y axis, and the right feed patch is symmetrical about the y axis; the grounding plate is an octagonal metal plate and is positioned above the dielectric substrate, and the grounding plate is provided with a radius ofRThe circular hole is internally provided with a balance metal belt passing through the circle center of the circular hole along the x-axis direction; r is 11-15 mm;
the packaging cavity comprises a packaging ground, a short circuit through hole, a radiation edge shielding through hole, a non-radiation edge shielding metal belt, an impedance matching through hole and an impedance matching circular plate.
The packaging ground is a metal plate with the same size as the dielectric plate, is positioned right below the dielectric plate, and has a distance h from the dielectric plate, wherein h is 8-10 mm;
the short circuit through holes are symmetrically distributed below the balance metal belt and are divided into a front group and a rear group, the number of each group is Ns, the spacing is ds, ds is 0.5-1.5mm, the upper end of each group is connected to the grounding plate, and the lower end of each group is connected with the packaging ground;
the radiation edge shielding through hole comprises a left radiation edge shielding through hole and a right radiation edge shielding through hole, the left radiation edge shielding through hole and the right radiation edge shielding through hole are symmetrical about an x axis, the lower ends of the left radiation edge shielding through hole and the right radiation edge shielding through hole are connected to the packaging ground, the upper ends of the left radiation edge shielding through hole and the right radiation edge shielding through hole are suspended, and the height of the upper. Two groups of via holes are arranged on the left radiating edge, each group comprises N via holes, the two groups of via holes are symmetrically distributed on two sides of a y axis, the distance from the y axis is dy (5-7mm), and the distance between the via holes is db (0.5-1.5 mm); the right radiation edge has two groups of via holes, each group has N via holes, the two groups of via holes are symmetrically distributed on two sides of the y axis, the distance from the y axis is dy (5-7mm), and the distance between the via holes is db (0.5-1.5 mm).
The non-radiation edge shielding via hole comprises a front non-radiation edge shielding via hole and a rear non-radiation edge shielding via hole, the front non-radiation edge shielding via hole and the rear non-radiation edge shielding via hole are symmetrical about a y axis, the lower ends of the front non-radiation edge shielding via hole and the rear non-radiation edge shielding via hole are connected to the packaging ground, the upper ends of the front non-radiation edge shielding via hole and the rear; two groups of front non-radiation side shielding through holes are arranged at the front end of the packaging cavity, each group comprises N through holes, the two groups of through holes are symmetrically distributed on two sides of an x axis, the distance from the x axis is dx (1-3mm), and the distance between the through holes is df (8-10 mm); two groups of rear non-radiation edge shielding via holes are arranged at the rear end of the packaging cavity, each group of N via holes are symmetrically distributed on two sides of an x axis, the distance from the x axis is dx (1-3mm), and the distance between the via holes is df (8-10 mm).
The non-radiation edge shielding metal strip comprises a front non-radiation edge shielding metal strip and a rear non-radiation edge shielding metal strip, and the front non-radiation edge shielding metal strip and the rear non-radiation edge shielding metal strip are symmetrical about a y axis; the front non-radiation edge metal is provided with N1 strips which are uniformly distributed along the z axis and are positioned at the front end of the packaging cavity, and the total height is 3/4 of the height h of the packaging cavity; the back non-radiation edge metal is provided with N1 strips which are uniformly distributed along the z axis and are positioned at the back end of the packaging cavity, and the total height is 3/4 of the height of the packaging cavity.
The number of the impedance matching through holes is 4, and the radius of the impedance matching through holes in the packaging cavity isaAnd (15-16mm) on the circle, the lower end is connected with the packaging ground, the upper end is suspended, the height is h-h0(8-9mm), the included angle between the 4 impedance matching through holes and the x axis is 45/135/225/315 degrees, the impedance matching circular plate is positioned at the suspended top end of the impedance matching through holes, and the radius is b (0.1-0.3 mm).
Compared with the existing unidirectional differential ultra-wideband antenna, the low-profile unidirectional radiation differential ultra-wideband antenna provided by the invention has the advantages that a packaging ground is added below the bidirectional radiation differential ultra-wideband antenna, and a short-circuit through hole is added between the packaging ground and the antenna ground, so that a packaging cavity and the bidirectional radiation antenna ground are connected together; the antenna has the advantages that the one-way radiation of the antenna is realized by adding the shielding through holes and the shielding metal strips on the radiation edge and the non-radiation edge, the impedance characteristic is adjusted, the impedance characteristic is further improved by introducing the impedance matching through holes and the impedance matching circular plates, and the ultra-wideband operation of the antenna is realized. The height of the whole packaging cavity is 1/10 of the wavelength at the lowest working frequency, so that the height of the whole antenna is reduced, and the volume of the whole antenna is reduced.
The antenna is simple in structure, effectively solves the problems of high gain and low gain of the existing one-way ultra-wideband antenna, and is suitable for wireless communication.
Drawings
FIG. 1 is a schematic structural view of the present invention.
FIG. 2 Return loss characteristic S of the antenna of the invention11Figure (a).
Fig. 3 is a gain diagram of the antenna of the present invention.
Fig. 4 is a directional diagram of the dual-direction radiation ultra-wideband differential antenna in the invention at 4 GHz.
Fig. 5 shows the directional diagram of the dual-direction radiation ultra-wideband differential antenna in the invention at 6 GHz.
Fig. 6 is a directional diagram of the dual-direction radiation ultra-wideband differential antenna in the invention at 8 GHz.
Fig. 7 is a 10GHz directional diagram of the dual-direction radiation ultra-wideband differential antenna of the present invention.
Figure 8 the pattern of the invention at 4 GHz.
Figure 9 the inventive pattern at 6 GHz.
Figure 10 the pattern of the invention at 8 GHz.
FIG. 11 the pattern of the invention at 10 GHz.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings: the embodiment is implemented on the premise of the technical scheme of the invention, and a detailed implementation mode is given.
FIG. 1 shows: the low-profile unidirectional radiation differential ultra-wideband antenna comprises a bidirectional radiation differential ultra-wideband antenna and a packaging cavity. For convenience of explanation, the present invention establishes a coordinate system with the origin of coordinates at the center of the uppermost ground plate, the xy-plane established in the plane of the uppermost ground plate, the x-axis along the balancing metal strip, the y-axis perpendicular thereto, and the z-axis perpendicular to the plane of the ground plate.
The bidirectional radiation differential ultra-wideband antenna comprises a left feed patch 1, a right feed patch 2, a rectangular dielectric substrate 3 and a ground plate 4; the left feed patch 1 and the right feed patch 2 are symmetrical about an x axis and are positioned on the lower layer of the rectangular dielectric substrate, and the left feed patch 1 and the right feed patch 2 are connected by a microstrip line, a stub line, a rectangular metal patch and a semicircular patch to form a whole. The microstrip line is connected with the stub line and connected with the rectangular metal patch, and the rectangular metal patch and the semicircular patch are connected into a whole.
The grounding plate is an octagonal metal plate and is positioned on the dielectric substrate, and the grounding plate is axially provided with a radius ofRThe round hole, the round hole is radial and set up a balanced strap along X axle direction, and balanced strap both ends are connected the ground plate.
The packaging cavity comprises a packaging ground 5, a short circuit through hole 6, a left radiation edge shielding through hole 7, a right radiation edge shielding through hole 8, a front non-radiation edge shielding through hole 9, a rear non-radiation edge shielding through hole 10, a front non-radiation edge shielding metal strip 11, a rear non-radiation edge shielding metal strip 12, an impedance matching through hole 13 and an impedance matching circular plate 14, the distance between a packaging floor and a ground plate forms the height of the packaging cavity, and the height of the packaging cavity is 9 mm.
The encapsulation ground is a rectangular metal plate with the same size as the dielectric plate and is positioned right below the dielectric plate. The short circuit through holes 6 are symmetrically distributed below the balance metal belt, the upper ends of the short circuit through holes are connected to the grounding plate, and the lower ends of the short circuit through holes are connected with the packaging ground. The radiation side shielding via hole comprises a left radiation side shielding via hole 7 and a right radiation side shielding via hole 8, and the left radiation side shielding via hole and the right radiation side shielding via hole are symmetrical about the x axis and are 16.5mm away from the x axis; the radiating edge via hole of every side has two sets ofly, 3 via holes of every group, and two sets of via holes distribute in y axle both sides symmetrically, and apart from y axle 5.81mm, and adjacent via hole interval is 1 mm. The lower ends of all the radiation edge shielding through holes are connected to the packaging ground, and the upper ends of the radiation edge shielding through holes are suspended, and the height of the radiation edge shielding through holes is 3/4 of the height of the packaging cavity.
The non-radiation edge shielding via hole comprises a front non-radiation edge shielding via hole 9 and a rear non-radiation edge shielding via hole 10, and the front non-radiation edge shielding via hole and the rear non-radiation edge shielding via hole are symmetrical about the y axis and are 16.7mm away from the y axis. Two groups of non-radiation edge through holes are arranged on each side, each group comprises 2 non-radiation edge shielding through holes, the two groups of non-radiation edge shielding through holes are symmetrically distributed on two sides of an x axis and are 1mm away from the x axis, and the distance between every two adjacent through holes is 8.71 mm. The lower ends of all the non-radiation side shielding through holes are connected to the packaging ground, and the upper ends of the non-radiation side shielding through holes are suspended, and the height of the non-radiation side shielding through holes is 3/4 of the height of the packaging cavity.
The non-radiation edge shielding metal strip comprises a front non-radiation edge shielding metal strip 11 and a rear non-radiation edge shielding metal strip 12, and the front non-radiation edge shielding metal strip and the rear non-radiation edge shielding metal strip are symmetrical about a y axis; each side of the non-radiating edge metal strip has 6 strips, which are uniformly distributed along the z-axis, and the total height is 3/4 of the height of the packaging cavity.
The number of the impedance matching through holes 13 is 4, the impedance matching through holes are located on a circle with the radius of 15.5mm in the packaging cavity, the included angles between the 4 impedance matching through holes and the x axis are 45 degrees, 135 degrees, 225 degrees and 315 degrees respectively, the lower end of the impedance matching through holes is connected with a packaging ground, the height of the impedance matching through holes is 8.5mm, the impedance matching circular plate 14 is located at the top end of the impedance matching through holes, and the radius of the impedance matching circular plate 14 is b.
Specific implementations of the present invention will be further described with reference to fig. 2-11.
FIG. 2 is S of the present invention11In the figure, curves 1-5 are respectively S of the antenna after a packaging ground, a short circuit through hole, a non-radiation edge shielding through hole and a shielding metal belt, a radiation edge shielding through hole, an impedance matching through hole and an impedance matching circular plate are added on the basis of the bidirectional radiation ultra-wideband differential antenna11. As can be seen from curve 1 in the figure, the antenna has poor impedance matching at 3-6GHz after being encapsulated, S11Are all larger than-10 dB; s around 3.5GHz after the addition of a shorted via (Curve 2)11Improved, but slightly deteriorated near 7 GHz; s around 6GHz after further adding non-radiative edge shielding via and shielding metal strip (curve 3)11The reduction is large, and the increase is slight near 3.5 GHz; on the basis, the introduction of the shielding via hole (curve 4) at the radiation edge enables the S of the 3-12GHz frequency band11All fall below-9 dB; finally, the addition of an impedance matching via and an impedance matching disk (Curve 5) results in a 3.5-12GHz S11All fall below-10 dB.
Fig. 3 shows the gain of the present invention, where curve 1 is the dual-radiation ultra-wideband differential antenna, and curve 2 is the gain of the present invention, it can be seen that, except for the slight decrease of the gain near 5GHz, the gains of the present invention at other frequencies are all greatly increased, and the maximum gain appears at 7GHz, which is 9.2dB, which is increased by 3.4dB compared with the dual-radiation ultra-wideband differential antenna. At 8.5GHz, the gain improvement amount is the largest and is 4 dB;
fig. 4-7 are normalized directional diagrams of a dual-radiating ultra-wideband differential antenna, where curves 1-4 are E-plane main polarization, E-plane cross polarization, H-plane main polarization, and H-plane cross polarization, respectively. The bidirectional radiation ultra-wideband differential antenna can be seen to be bidirectional radiation on each frequency, and has the same radiation level in forward and backward polarization;
fig. 8-11 are normalized patterns of the present invention, where curves 1-4 are E-plane main polarization, E-plane cross polarization, H-plane main polarization, and H-plane cross polarization, respectively. It can be seen that the present invention has unidirectional radiation at each frequency, the radiation in the forward direction is much greater than the radiation in the backward direction, and the front-to-back ratios at 4, 6, 8, and 10GHz are respectively: 14.2dB, 15.6dB, 17.0dB, 17.9 dB.
Claims (1)
1. A low-profile unidirectional radiation differential ultra-wideband antenna is characterized in that: the bidirectional radiation differential ultra-wideband antenna is positioned above the packaging cavity; the height of the whole packaging cavity is 1/10 of the wavelength at the lowest working frequency, so that the height of the whole antenna is reduced, and the volume of the antenna is reduced; the shielding through holes and the shielding metal strips are arranged on the radiation edges and the non-radiation edges, so that the one-way radiation of the antenna is realized, and the ultra-wideband work of the antenna is realized;
the bidirectional radiation differential ultra-wideband antenna is provided with a ground plate, a rectangular dielectric substrate, a left feed patch and a right feed patch from top to bottom; the grounding plate is placed on the rectangular dielectric substrate, the left feed patch and the right feed patch are symmetrical about the x axis and the y axis and are positioned below the rectangular dielectric substrate; the earth plate is provided with a round hole, a balance metal strip is arranged in the radial direction of the round hole and along the x-axis direction, and two ends of the balance metal strip are connected with the earth plate; the left feed patch is formed by connecting a microstrip line, a stub line, a rectangular metal patch and a semicircular patch into a whole; the right feed patch is formed by connecting a microstrip line, a stub line, a rectangular metal patch and a semicircular patch into a whole; the microstrip line is connected with the stub line and the rectangular metal patch, and the rectangular metal patch is connected with the semicircular patch;
the packaging cavity comprises a packaging ground, a short circuit through hole, a radiation edge shielding through hole, a non-radiation edge shielding metal belt, an impedance matching through hole and an impedance matching circular plate, and the height of the packaging cavity is 8-10 mm; the upper end of the packaging cavity is connected to the grounding plate, and the lower end of the packaging cavity is connected with the packaging ground; the packaging ground is positioned right below the dielectric substrate and is a metal plate with the same shape as the dielectric plate; the short circuit through hole is positioned below the balance metal belt;
the radiation side shielding through hole comprises a left radiation side shielding through hole and a right radiation side shielding through hole, the left radiation side shielding through hole and the right radiation side shielding through hole are symmetrical about an x axis, the lower end of the left radiation side shielding through hole is connected to the packaging ground, and the upper end of the left radiation side shielding through hole is suspended in the air; the lower end of the right radiation side shielding through hole is connected to the packaging ground, the upper end of the right radiation side shielding through hole is suspended, and the heights of the left radiation side shielding through hole and the right radiation side shielding through hole are 3/4 of the height of the packaging cavity; the distance between the two groups of left radiation side shielding through holes and the y axis is 5-7mm, and the distance between the adjacent left radiation side shielding through holes is 0.5-1.5 mm; the right radiation side shielding through holes are divided into two groups, each group comprises a plurality of through holes, the two groups of radiation side shielding through holes are symmetrically distributed on two sides of a y axis, the distance from the y axis is 5-7mm, and the distance between every two adjacent right radiation side shielding through holes is 0.5-1.5 mm;
the non-radiation edge shielding via hole comprises a front non-radiation edge shielding via hole and a rear non-radiation edge shielding via hole, the front non-radiation edge shielding via hole and the rear non-radiation edge shielding via hole are symmetrical about the y axis, the lower end of the front non-radiation edge shielding via hole is connected to the packaging ground, and the upper end of the front non-radiation edge shielding via hole is suspended; the lower end of the rear non-radiation edge shielding through hole is connected to the packaging ground, and the upper end of the rear non-radiation edge shielding through hole is suspended in the air; the heights of the front non-radiation edge shielding through hole and the rear non-radiation edge shielding through hole are 3/4 of the height of the packaging cavity; two groups of front non-radiation side shielding through holes are arranged at the front end of the packaging cavity, each group of through holes is provided with a plurality of through holes, the two groups of front non-radiation side shielding through holes are symmetrically distributed on two sides of an x axis, the distance from the two groups of front non-radiation side shielding through holes to the x axis is 1-3mm, and the distance between every two adjacent front non-radiation side shielding through holes is 8-10 mm; two groups of rear non-radiation side shielding via holes are arranged at the rear end of the packaging cavity, each group comprises a plurality of via holes, the two groups of rear non-radiation side shielding via holes are symmetrically distributed on two sides of an x axis, the distance from the x axis is 1-3mm, and the distance between every two adjacent rear non-radiation side shielding via holes is 8-10 mm;
the non-radiation edge shielding metal strip comprises a front non-radiation edge shielding metal strip and a rear non-radiation edge shielding metal strip, and the front non-radiation edge shielding metal strip and the rear non-radiation edge shielding metal strip are symmetrical around the y axis; the front non-radiation edge shielding metal belts are uniformly distributed along the z axis and are positioned at the front end of the packaging cavity, and the height of the front non-radiation edge shielding metal belt is 3/4 of the height of the packaging cavity; a plurality of rear non-radiation edge shielding metal belts are uniformly distributed along the z axis and are positioned at the rear end of the packaging cavity, and the height of the rear non-radiation edge shielding metal belt is 3/4 of the height of the packaging cavity;
the number of the impedance matching through holes is 4, the lower end of the impedance matching through holes is connected with a packaging ground, the upper end of the impedance matching through holes is suspended, and the connection points of the 4 impedance matching through holes on the packaging ground are positioned on the straight lines with the included angles of 45 degrees, 135 degrees, 225 degrees and 315 degrees with the x axis respectively; the impedance matching circular plate takes the impedance matching through hole as a circle center and is positioned at the suspended top end of the impedance matching through hole;
the origin of coordinates is located at the center of the uppermost ground plate, the xy plane is established on the plane of the uppermost ground plate, the x axis is along the balancing metal strip, the y axis is perpendicular to the y axis, and the z axis is perpendicular to the plane of the ground plate.
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| CN201810009520.7A CN108183329B (en) | 2018-01-05 | 2018-01-05 | Low-profile unidirectional radiation differential ultra-wideband antenna |
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| CN110931939B (en) * | 2019-11-29 | 2021-10-26 | 维沃移动通信有限公司 | Millimeter wave antenna unit and electronic equipment |
| CN112582808B (en) * | 2020-11-13 | 2022-02-15 | 华南理工大学 | Broadband butterfly patch antenna array suitable for millimeter wave 5G communication |
| CN115548670A (en) * | 2021-06-30 | 2022-12-30 | 华为技术有限公司 | Antenna structure, antenna module, chip and electronic equipment |
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| CN102683834A (en) * | 2011-03-09 | 2012-09-19 | 株式会社村田制作所 | Horizontal radiation antenna |
| CN103066385A (en) * | 2012-12-22 | 2013-04-24 | 西安电子科技大学 | Low temperature co-fired ceramic (LTCC) double-layer microstrip antenna used for system-in-package |
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| KR102211392B1 (en) * | 2016-02-12 | 2021-02-04 | 한국전자통신연구원 | Patch antenna |
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|---|---|---|---|---|
| CN102683834A (en) * | 2011-03-09 | 2012-09-19 | 株式会社村田制作所 | Horizontal radiation antenna |
| CN103066385A (en) * | 2012-12-22 | 2013-04-24 | 西安电子科技大学 | Low temperature co-fired ceramic (LTCC) double-layer microstrip antenna used for system-in-package |
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| Differential Dual-Band Antenna-in-Package With T-Shaped Slots;Hanwei Wu等;《IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS》;20121220;第11卷;第1446-1449页 * |
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