CN107359420B - Miniaturized high-gain dual-band circularly polarized antenna - Google Patents
Miniaturized high-gain dual-band circularly polarized antenna Download PDFInfo
- Publication number
- CN107359420B CN107359420B CN201710578549.2A CN201710578549A CN107359420B CN 107359420 B CN107359420 B CN 107359420B CN 201710578549 A CN201710578549 A CN 201710578549A CN 107359420 B CN107359420 B CN 107359420B
- Authority
- CN
- China
- Prior art keywords
- shaped
- radiator
- slot hole
- microstrip
- rectangular
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002184 metal Substances 0.000 claims abstract description 36
- 229910052751 metal Inorganic materials 0.000 claims abstract description 36
- 239000000758 substrate Substances 0.000 claims abstract description 24
- 230000005855 radiation Effects 0.000 claims description 48
- 239000000523 sample Substances 0.000 claims description 9
- 230000009977 dual effect Effects 0.000 claims description 7
- 230000010287 polarization Effects 0.000 abstract description 21
- 238000004891 communication Methods 0.000 abstract description 11
- 239000002356 single layer Substances 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000002355 dual-layer Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000005404 monopole Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
-
- 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
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Waveguide Aerials (AREA)
Abstract
The invention discloses a miniaturized high-gain dual-band circular polarized antenna which has a simple structure and can realize miniaturization, dual-band, high-gain and right-hand circular polarization, increase the bandwidth of the antenna and improve the gain, wherein the miniaturized high-gain dual-band circular polarized antenna comprises an insulating medium substrate, a radiator and a U-shaped metal back cavity; the radiator is provided with a first T-shaped slotted hole, a second T-shaped slotted hole, a third T-shaped slotted hole and a fourth T-shaped slotted hole which extend from the center of the radiator to four sides and are uniformly distributed along the circumference taking the center of the radiator as the center of the circle; the diagonal of the radiator is provided with a first rectangular slot hole and a second rectangular slot hole, a first T-shaped radiator is arranged in the first rectangular slot hole, and a second T-shaped radiator is arranged in the second rectangular slot hole. The miniaturized high-gain dual-band circularly polarized antenna can meet the requirement of a military communication mobile phone antenna, is conveniently placed at the top of the communication mobile phone antenna, and realizes cover lifting.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a miniaturized high-gain dual-band right-handed circularly polarized antenna resonating in a large S frequency band uplink and downlink dual-band.
Background
It is known that: antennas play an important role in transmitting and receiving electromagnetic waves in wireless communication systems, and in addition to being capable of efficiently radiating or receiving electromagnetic waves, they also play a role in converting high-frequency electric currents (guided wave energy) into wireless electromagnetic waves or converting wireless electromagnetic waves into high-frequency electric currents (guided wave energy). The antenna clearly plays the most basic and indispensable important role, and the performance of the antenna directly influences the quality of the whole communication system.
With the development of communication technology, the linear polarization mode can not meet the working requirements, but the application of the circular polarization antenna is very important at times, the circular polarization antenna can receive incoming waves with arbitrary polarization, and the radiation waves can also be received by the antenna with arbitrary polarization, so that the circular polarization antenna can inhibit rain and fog interference and resist multipath reflection, and can be applied to the fields of communication, radars, electronic countermeasure and the like, and has wide application prospects. In recent years, with rapid development of satellite positioning communication systems (such as GPS and beidou), circular polarization patch antennas have been attracting more and more attention. The circularly polarized patch antenna has the characteristics of small size, light weight, low profile, easiness in processing, strong applicability to weather environment and the like.
There are various ways to achieve miniaturization of the antenna, including the use of a material with a high dielectric constant, and the provision of a slot with various shapes in the patch; in order to realize the circular polarization of the antenna, a single feed method and a double feed or multiple feed method are adopted as the feed mode, and although the double feed and the multiple feed can increase the circular polarization bandwidth, the complexity of the feed network is greatly increased, so that the miniaturization of the antenna is not facilitated; in order to obtain dual frequency bands, dual-layer microstrip patches are often adopted, but the dual-layer patches increase manufacturing cost and difficulty.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a miniaturized high-gain dual-band right-hand circular polarized antenna which can realize miniaturization, dual-band, high gain and right-hand circular polarization, increase the bandwidth of the antenna and improve the gain.
The technical scheme adopted for solving the technical problems is as follows: the miniaturized high-gain dual-band right-handed circularly polarized antenna comprises an insulating medium substrate, a radiator and a U-shaped metal back cavity; the radiator is printed on the upper surface of the insulating medium substrate in a plane;
the radiator is rectangular, and is provided with a first T-shaped slotted hole, a second T-shaped slotted hole, a third T-shaped slotted hole and a fourth T-shaped slotted hole which extend from the center of the radiator to four sides and are uniformly distributed along the circumference taking the center of the radiator as the center of the circle; the first T-shaped slotted hole, the second T-shaped slotted hole, the third T-shaped slotted hole and the fourth T-shaped slotted hole comprise a transverse slotted hole and a vertical slotted hole, the transverse slotted hole is parallel to the side line of the radiator, and the vertical slotted hole is perpendicular to the side line of the radiator;
a first rectangular slot hole and a second rectangular slot hole are formed in the diagonal of the radiator, a first T-shaped radiator is arranged in the first rectangular slot hole, and a second T-shaped radiator is arranged in the second rectangular slot hole;
the first T-shaped radiator comprises a first narrow-side radiation microstrip and a first wide-side radiation microstrip; the first broadside radiation microstrip is positioned at one end of the first narrow side radiation microstrip;
the width of the first narrow-side radiation microstrip is smaller than that of the first rectangular slotted hole, and a space is reserved between the first wide-side radiation microstrip and one end of the first rectangular slotted hole;
the second T-shaped radiator comprises a second narrow-side radiation microstrip and a second wide-side radiation microstrip; the second broadside radiation microstrip is positioned at one end of the second narrow side radiation microstrip;
the width of the second narrow-side radiation microstrip is smaller than that of the second rectangular slotted hole, and a space is reserved between the second wide-side radiation microstrip and one end of the second rectangular slotted hole;
the U-shaped metal back cavity is arranged right below the insulating medium substrate, and a feed structure is arranged in the U-shaped metal back cavity; the feed structure is electrically connected with the radiator.
Further, the first T-shaped slot, the second T-shaped slot, the third T-shaped slot and the fourth T-shaped slot each include a transverse slot and a vertical slot, and the transverse slot has a width unequal to the width of the vertical slot; and the width of the transverse slotted hole is larger than that of the vertical slotted hole.
Further, the lengths of the vertical slots of the slots which are symmetrical in pairs in the first T-shaped slot, the second T-shaped slot, the third T-shaped slot and the fourth T-shaped slot are equal, and the lengths of the vertical slots and the lengths of the horizontal slots are unequal if the lengths of the vertical slots and the lengths of the horizontal slots are asymmetrical.
Further, the first rectangular slot hole and the second rectangular slot hole have the same width and length.
Further, the widths and the lengths of the first broadside radiation microstrip and the second broadside radiation microstrip are correspondingly equal; the distance between the first broadside radiation microstrip and one end of the first rectangular slot is equal to the distance between the second broadside radiation microstrip and one end of the second rectangular slot.
Further, the first broadside radiation microstrip and the second broadside radiation microstrip have the same width; the first broadside radiating microstrip and the second broadside radiating microstrip have different lengths.
Further, the U-shaped metal back cavity is provided with a bottom plate and two opposite side walls; the distance between the upper surface of the bottom plate and the radiator is smaller than 0.01λ, where λ is the wavelength of low-frequency air.
Preferably, the feeding structure in the U-shaped metal back cavity comprises a feeding probe arranged on a bottom plate of the U-shaped metal back cavity; the feed probe is fed coaxially with the radiator.
The beneficial effects of the invention are as follows: the miniaturized high-gain dual-band right-handed circularly polarized antenna is characterized in that a first T-shaped slot hole, a second T-shaped slot hole, a third T-shaped slot hole and a fourth T-shaped slot hole which extend from the center of a radiator to four sides and are uniformly distributed along the circumference taking the center of the radiator as the center of a circle are arranged on the radiator; the two modes with equal amplitude are excited by adjusting the length of the gap to excite the phase difference of 90 degrees so as to realize circular polarization.
Compared with the prior art, the miniaturized high-gain dual-band right-hand circular polarized antenna has the following characteristics:
1) The single-layer radiation patch is printed with square radiation patches on the dielectric substrate, and the radiation patches are the same as the floor in size. Thereby simplifying the result and being beneficial to realizing miniaturization.
2) Four T-shaped grooves are formed in the directions from the center to the outside along the four sides of the single-layer radiation patch, and the T-shaped grooves prolong the current path, so that the purpose of miniaturization is achieved; the four T-shaped grooves are symmetrical to each other in pairs and are perpendicular to each other, and the symmetrical positions are beneficial to the formation of orthogonal currents; according to the characteristic of circular polarization, by adjusting the length of the T-shaped groove so that a current phase difference of 90 degrees exists, good impedance matching can be realized by adjusting the width of the T-shaped groove. The lengths of the two pairs of T-shaped grooves in the vertical direction are unequal, wherein at low frequencies, current mainly flows along the T-shaped groove with longer length, and at high frequencies, current mainly flows along the T-shaped groove with shorter length. Thereby increasing the bandwidth of the antenna and increasing the gain to realize right-hand circular polarization.
3) Two rectangular grooves with equal size are formed along the direction of the single-layer radiation diagonal, and current flows along the path of the rectangular grooves, so that electromagnetic waves are radiated.
4) A pair of T-shaped radiators are added in two rectangular grooves with equal size, and current of the antenna flows along the T-shaped radiators. The coupling is better at the part of the T-shaped head, and better impedance matching is realized. Further, the lengths of the T-shaped radiator in the vertical direction are not equal, and the different lengths affect the distribution of the current. At low frequencies, the pilot current flows along the path where the total length of the T-slot length and the diagonal rectangular slot is longest, and at high frequencies, the pilot current flows along the path where the total length of the T-slot length and the diagonal rectangular slot is shortest.
5) Furthermore, the dielectric constant of the insulating medium substrate adopts 10.2 Rogowski plates, so that the purpose of reducing the size of the antenna is achieved.
6) Furthermore, a U-shaped metal back cavity is adopted, and metal walls are loaded on two sides of the radiator, so that the radiation of the antenna is facilitated along the vertical direction of the radiation patch; the metal sheets and the floor on two sides form a semi-closed U-shaped metal cavity, air is filled between the floor and the bottommost layer of the dielectric substrate of the radiation patch, and the dielectric constant of the dielectric substrate is high, but the equivalent dielectric constant is only 2, so that the antenna can obtain high gain, and the cavity structure is adopted, thereby being beneficial to realizing the impedance matching of the antenna and reducing the size of the antenna.
7) Further, the volume of the antenna can be set to be 30mmX, 30mmX and 5mm, and the whole size is smaller; the mobile phone can receive the uplink and downlink frequency bands of the S frequency band at the same time.
In summary, the miniaturized high-gain dual-band right-handed circularly polarized antenna adopts a single feed method to feed, and a microstrip circularly polarized antenna with a slot in a shape like a Chinese character 'mi' on a microstrip radiating sheet is realized by adjusting the length of the slot, namely the length of a narrow radiator of a T-shaped radiator, and exciting two modes with 90-degree phase difference and equal amplitude. By loading the U-shaped cavity below the radiation patch, the miniaturized, dual-band and high-gain right-hand circularly polarized antenna is finally realized, and the practical application requirements are met.
Drawings
Fig. 1 is a perspective view of a miniaturized high-gain dual-band right-handed circularly polarized antenna in an embodiment of the present invention;
fig. 2 is a front view of a miniaturized high-gain dual-band right-handed circularly polarized antenna according to an embodiment of the present invention;
FIG. 3 is a top view of a miniaturized high-gain dual-band right-handed circularly polarized antenna according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a feed structure on a bottom plate of a miniaturized high-gain dual-band right-handed circularly polarized antenna according to an embodiment of the present invention;
FIG. 5 shows that the miniaturized high-gain dual-band right-handed circularly polarized antenna in the frequency band range of dual-frequency resonance satisfies S in the embodiment of the invention, 1.98GHz-2.01GHz and 2.17GHz-2.2GHz 11 The relative bandwidth of the antenna is less than or equal to-10 dBi and reaches 3 percent, compared with a schematic diagram of 1 percent of impedance bandwidth of a miniaturized single-layer circularly polarized microstrip antenna;
FIG. 6 is an E-plane directional diagram of a miniaturized high-gain dual-band right-handed circularly polarized antenna at a frequency point of 1.98GHz in an embodiment of the invention;
FIG. 7 is an E-plane directional diagram of a miniaturized high-gain dual-band right-handed circularly polarized antenna at a frequency point of 2.17GHz in an embodiment of the invention;
the figures indicate: the antenna comprises a 1-insulating medium substrate, a 2-radiator, a 21-first T-shaped slot, a 22-second slot, a 23-third slot, a 24-fourth slot, a 25-first rectangular slot, a 26-second rectangular slot, a 3-U-shaped metal back cavity, a 31-feed probe, a 32-side wall, a 33-bottom plate, a 4-first T-shaped radiator, a 41-first narrow side radiating microstrip, a 42-first wide side radiating microstrip, a 5-second T-shaped radiator, a 51-second narrow side radiating microstrip, a 52-second wide side radiating microstrip, a feed structure on a 6-bottom plate and a 61-feed position.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1 to 7, the miniaturized high-gain dual-band right-handed circularly polarized antenna of the invention comprises an insulating medium substrate 1, a radiator 2 and a U-shaped metal back cavity 3; the radiator 2 is printed on the upper surface of the insulating medium substrate 1 in a plane;
the radiator 2 is rectangular, and the radiator 2 is provided with a first T-shaped slotted hole 21, a second T-shaped slotted hole 22, a third T-shaped slotted hole 23 and a fourth T-shaped slotted hole 24 which extend from the center of the radiator 2 to four sides and are uniformly distributed along the circumference taking the center of the radiator 2 as the center of the circle; the first T-shaped slot 21, the second T-shaped slot 22, the third T-shaped slot 23 and the fourth T-shaped slot 24 each comprise a transverse slot and a vertical slot, the transverse slot is parallel to the side line of the radiator 2, and the vertical slot is perpendicular to the side line of the radiator 2;
a first rectangular slot 25 and a second rectangular slot 26 are arranged on the diagonal of the radiator 2, a first T-shaped radiator 4 is arranged in the first rectangular slot 25, and a second T-shaped radiator 5 is arranged in the second rectangular slot 26;
the first T-shaped radiator 4 comprises a first narrow side radiating microstrip 41 and a first wide side radiating microstrip 42; the first broadside radiation microstrip 42 is located at one end of the first narrow side radiation microstrip 41;
the first narrow-side radiating microstrip 41 has a width smaller than that of the first rectangular slot 25, and a space is provided between the first wide-side radiating microstrip 42 and one end of the first rectangular slot 25;
the second T-shaped radiator 5 includes a second narrow side radiating microstrip 51 and a second wide side radiating microstrip 52; the second broadside radiating microstrip 52 is located at one end of the second narrow side radiating microstrip 51;
the second narrow-side radiating microstrip 51 has a width smaller than that of the second rectangular slot 26, and a space is provided between the second broad-side radiating microstrip 52 and one end of the second rectangular slot 26;
the U-shaped metal back cavity 3 is arranged on the whole lower part of the insulating medium substrate 1, and a feed structure is arranged in the U-shaped metal back cavity 3; the feed structure is electrically connected to the radiator 2.
In particular, the radiator 2 may be a radiating patch made of copper material and plated with tin thereon.
During the use process:
specifically, the miniaturized high-gain dual-band right-handed circularly polarized antenna is composed of a radiator 2 with a rice-shaped slotted hole, an insulating medium substrate 1 and a U-shaped metal back cavity 3. The radiator 2 is made of copper material and is plated with tin on the copper material, and is printed on the upper surface of the insulating medium substrate 1 in a plane shape. The radiator 2 can be made of gold-plated, silver, tin and other metal materials, but the radiator 2 is made of copper materials in consideration of performance and cost. In order to realize the miniaturization characteristic of the antenna, a plate material with high dielectric constant is adopted, so that the size of the antenna is greatly reduced. By opening a slot in the radiating patch, the current path of the antenna is lengthened and the size of the antenna is further reduced. 4T-shaped grooves are formed from the center of the radiation patch to the periphery, wherein the T-shaped grooves perpendicular to two parallel radiation sides are symmetrical in pairs, and the sizes of the T-shaped grooves are equal (21 and 22, 23 and 24). The lengths of two T-shaped grooves at 45 degrees in the vertical direction are not equal
Two rectangular slots with the same size, namely a first rectangular slot 25 and a second rectangular slot 26, are formed on the diagonal of the radiation patch, so that the current amplitude along the slots is ensured to be equal; and the width of the rectangular slot is larger than the width of the vertical slot of the T-shaped slot.
According to the principle of slot antenna, the first rectangular slot 25 and the second rectangular slot 26 in the miniaturized high-gain dual-band right-handed circularly polarized antenna of the present invention are equivalent to monopoles with the same width, when the width of the monopole is wider, the impedance bandwidth is wider, so the width of the rectangular slot is larger, the impedance matching bandwidth is wider, but due to the limitation of the size of the antenna and the characteristics of the microstrip antenna, in order to obtain the widest impedance bandwidth, the proper values of the widths of the first rectangular slot 25 and the second rectangular slot 26 are optimized to obtain the wider bandwidth.
To obtain dual bands, the lengths of the transverse and vertical slots of the four T-shaped slots, namely the first T-shaped slot 21, the second T-shaped slot 22, the third T-shaped slot 23 and the fourth T-shaped slot 24, are optimized.
Specifically, in the low frequency band, the current flows along the path with the longest length of the T-shaped slot, and in the high frequency band, the current flows along the path with the shortest length of the T-shaped slot.
The width of the transverse slot hole of the T-shaped slot is adjusted to have a large impedance matching adjustment effect, and the width of the T-shaped slot hole can be increased to a certain extent to increase the bandwidth of the antenna. The lengths of the vertical slotted holes of the T-shaped slots have great influence on circular polarization, and the lengths of the transverse slotted holes and the vertical slotted holes are mainly adjusted to obtain good axial ratio characteristics. The frequency difference of two frequency bands can be adjusted by adjusting the lengths of the vertical slotted holes of the two pairs of T-shaped slots perpendicular to the two pairs of radiation edges. In adjusting the T-slots, in order to keep the current amplitudes equal, while adjusting the symmetrical T-slots for length and width, each corresponding parameter is kept uniformly variable.
As shown in fig. 3, a first T-shaped radiator 4 is disposed in the first rectangular slot 25, and a second T-shaped radiator 5 is disposed in the second rectangular slot 26; the first T-shaped radiator 4 and the second T-shaped radiator 5 are both T-shaped microstrip radiating patches; the T-shaped microstrip radiating patch consists of two parts, namely a wide rectangular microstrip line and a narrow rectangular microstrip line, wherein the 41-first narrow-side radiating microstrip and the 51 second narrow-side radiating microstrip in the figure 3 are both narrow rectangular microstrip lines; the 42-first broadside radiating microstrip and 52 second broadside radiating microstrip of fig. 3 are all wide rectangular microstrip lines. The coupling of the wide rectangular microstrip line and the slot is larger as the microstrip line and the slot are closer; the greater the impedance bandwidth. The antenna is fed at the center of the microstrip radiating patch, and current flows from the center along the T-shaped microstrip radiating patch to four directions.
When the lengths of the two narrow-side microstrip lines forming the two pairs of T-shaped microstrip radiating patches are unequal, the current phase difference of 90 degrees can be realized by adjusting the lengths of the two metal strips so as to realize circular polarization, among the above-mentioned numerous factors, the influence of the length of the narrow-side microstrip line and the length difference of the two narrow-side microstrip lines on the impedance matching of the antenna is the greatest, when the length of the T-shaped microstrip radiating patch is close to the length of the rectangular slot, the slot edge has almost no current coupling, and the currents on the two T-shaped microstrip radiating patches and the slot edge are very small, so that the gain is very low, and the impedance matching characteristic is very poor; when not optimized to a suitable length difference, the impedance matching performance is poor. When the antenna resonates at a low frequency, the total length of the current path is approximately half the wavelength at the low frequency resonance, and when the antenna resonates at a high frequency, the total length of the current path is approximately half the wavelength at the high frequency resonance.
As shown in fig. 3, the length of the first narrow side radiating microstrip 41 of the first T-shaped radiator 4 is L1, and the length of the second narrow side radiating microstrip 51 of the second T-shaped radiator 5 is L2; to achieve right-hand circular polarization, L1< L2, if left-hand circular polarization is desired, L1> L2, and L1-L2 have a value of about 0.02λ; lambda is the low frequency air wavelength.
Further, in order to achieve miniaturization of the antenna, specifically, the insulating dielectric substrate 1 is a rogers high dielectric constant plate with a dielectric constant of 10.2 and a thickness of 0.635mm, but the plate with a high dielectric constant often has the disadvantages of narrow bandwidth and low gain of the antenna, so that in order to increase the bandwidth of the antenna and increase the gain of the antenna, air is filled between the insulating dielectric substrate 1 and a bottom plate provided in the U-shaped metal back cavity 3, impedance matching can be adjusted, the relative dielectric constant is reduced by adding the air medium and the insulating dielectric substrate, and finally, the equivalent relative dielectric constant is 2.03. The distance between the bottom of the insulating medium and the floor is 5mm, so that the antenna is equivalent to a printed metal microstrip patch which is flat on a dielectric plate with the dielectric constant of 2.03, the dielectric constant is low, the thickness of the dielectric plate is large, and the bandwidth and the gain of the antenna are greatly improved compared with the case of a miniaturized microstrip antenna with high dielectric constant and having narrow frequency band and low gain. The antenna is placed at the top end of the military communication mobile phone and is manufactured into a lifting cover mode, and the loading metal back cavity can enable the antenna to be firmly placed at the top end of the mobile phone and reduce interference of an external circuit of the military communication mobile phone. In order to reduce the construction complexity of the antenna, the insulating dielectric plate and the U-shaped metal back cavity are firmly adhered by strong glue. The feeding structure adopts metal probe feeding, so that on one hand, good impedance matching can be obtained, and on the other hand, the welding part of the probe feeding is well welded, so that the microstrip patch and the metal back cavity can be stabilized.
The implementation effect is as shown in fig. 5 and fig. 7 only: fig. 5 is a standing wave test chart of an antenna according to an embodiment of the present invention. As shown in FIG. 5, within the frequency band range of the dual-frequency resonance, 1.98GHz-2.01GHz and 2.17GHz-2.2GHz satisfy S 11 The relative bandwidth of the antenna is less than or equal to-10 dBi and reaches 3%, and compared with a miniaturized single-layer circularly polarized microstrip antenna, the antenna has only 1% of impedance bandwidth, and the structure greatly increases the impedance bandwidth of the antenna; FIGS. 6 and 7 are E-plane directional diagrams of the antenna at frequency points 1.98GHz and 2.17GHz, respectively; the gains of the antenna are respectively 3.32dB and 3.15dB, so that the requirements of engineering application are met.
In order to better achieve impedance matching, specifically, the first T-shaped slot 21, the second T-shaped slot 22, the third T-shaped slot 23 and the fourth T-shaped slot 24 each include a transverse slot and a vertical slot, and the width of the transverse slot is unequal to that of the vertical slot; and the width of the transverse slotted hole is larger than that of the vertical slotted hole.
To achieve a phase difference of 90; specifically, the lengths of the vertical slots of the slots symmetrical in pairs in the first T-shaped slot 21, the second T-shaped slot 22, the third T-shaped slot 23 and the fourth T-shaped slot 24 are equal, and the lengths of the vertical slots and the lengths of the horizontal slots are unequal if the lengths of the vertical slots and the lengths of the horizontal slots are asymmetrical. Specifically, the lengths of the vertical slots of the first T-shaped slot 21 and the third T-shaped slot 23 are equal; the lengths of the vertical slots of the second T-shaped slot 22 and the fourth T-shaped slot 24 are equal; the lengths of the vertical slots and the horizontal slots of the first T-shaped slot 21 and the second T-shaped slot 22 are not equal; the lengths of the vertical slotted holes and the horizontal slotted holes of the second T-shaped slotted hole 22 and the third T-shaped slotted hole 23 are not equal; the lengths of the vertical slots and the horizontal slots of the third T-shaped slot 23 and the fourth T-shaped slot 24 are not equal; the length of the vertical slot and the length of the horizontal slot of the fourth T-shaped slot 24 are not equal to those of the first T-shaped slot 21.
In order to excite the currents with equal amplitude, specifically, the first rectangular slot 25 and the second rectangular slot 26 have the same width and length.
In order to obtain equal coupling currents, in particular, the first broadside radiating microstrip 42 and the second broadside radiating microstrip 52 have widths and lengths that are correspondingly equal; the distance between the first broadside radiating microstrip 42 and one end of the first rectangular slot 25 is equal to the distance between the second broadside radiating microstrip 52 and one end of the second rectangular slot 26.
In order to obtain a phase difference of 90 degrees between the two currents, specifically, the first broadside radiating microstrip 42 and the second broadside radiating microstrip 52 have equal widths; the first broadside radiating microstrip 42 and the second broadside radiating microstrip 52 have unequal lengths.
In order to better achieve impedance matching and to increase bandwidth and improve axial ratio characteristics, in particular, the U-shaped metal back cavity 3 has a bottom plate 33 and two opposite side walls 32; the distance between the upper surface of the bottom plate 33 and the radiator 2 is smaller than 0.01λ, where λ is the wavelength of the low-frequency air.
In order to make the feeding mode simple, further, the feeding structure in the U-shaped metal back cavity 3 comprises a feeding probe 31 arranged on a bottom plate 33 of the U-shaped metal back cavity 3; the feed probe 31 feeds coaxially with the radiator 2. The coaxial feed is adopted, the mode is simple, and the implementation is easy.
In summary, compared with the prior art, the miniaturized high-gain dual-band right-handed circularly polarized antenna has the following characteristics:
1) The single-layer radiation patch is printed with square radiation patches on the dielectric substrate, and the radiation patches are the same as the floor in size. Thereby simplifying the result and being beneficial to realizing miniaturization.
2) Four T-shaped grooves are formed in the directions from the center to the outside along the four sides of the single-layer radiation patch, and the T-shaped grooves prolong the current path, so that the purpose of miniaturization is achieved; the four T-shaped grooves are symmetrical to each other in pairs and are perpendicular to each other, and the symmetrical positions are beneficial to the formation of orthogonal currents; according to the characteristic of circular polarization, by adjusting the length of the T-shaped groove so that a current phase difference of 90 degrees exists, good impedance matching can be realized by adjusting the width of the T-shaped groove. The lengths of the two pairs of T-shaped grooves in the vertical direction are unequal, wherein at low frequencies, current mainly flows along the T-shaped groove with longer length, and at high frequencies, current mainly flows along the T-shaped groove with shorter length. Thereby increasing the bandwidth of the antenna and increasing the gain to realize right-hand circular polarization.
3) Two rectangular grooves with equal size are formed along the direction of the single-layer radiation diagonal, and current flows along the path of the rectangular grooves, so that electromagnetic waves are radiated.
4) A pair of T-shaped radiators are added in two rectangular grooves with equal size, and current of the antenna flows along the T-shaped radiators. The coupling is better at the part of the T-shaped head, and better impedance matching is realized. Further, the lengths of the T-shaped radiator in the vertical direction are not equal, and the different lengths affect the distribution of the current. At low frequencies, the pilot current flows along the path where the total length of the T-slot length and the diagonal rectangular slot is longest, and at high frequencies, the pilot current flows along the path where the total length of the T-slot length and the diagonal rectangular slot is shortest.
5) Furthermore, the dielectric constant of the insulating medium substrate adopts 10.2 Rogowski plates, so that the purpose of reducing the size of the antenna is achieved.
6) Furthermore, a U-shaped metal back cavity is adopted, and metal walls are loaded on two sides of the radiator, so that the radiation of the antenna is facilitated along the vertical direction of the radiation patch; the metal sheets and the floor on two sides form a semi-closed U-shaped metal cavity, air is filled between the floor and the bottommost layer of the dielectric substrate of the radiation patch, and the dielectric constant of the dielectric substrate is high, but the equivalent dielectric constant is only 2, so that the antenna can obtain high gain, and the cavity structure is adopted, thereby being beneficial to realizing the impedance matching of the antenna and reducing the size of the antenna.
7) Further, the volume of the antenna can be set to be 30mmX, 30mmX and 5mm, and the whole size is smaller; the mobile phone can receive the uplink and downlink frequency bands of the S frequency band at the same time.
In summary, the miniaturized high-gain dual-band right-handed circularly polarized antenna adopts a single feed method to feed, and a microstrip circularly polarized antenna with a slot in a shape like a Chinese character 'mi' is arranged on a microstrip radiating sheet, and two modes with 90-degree phase difference and equal amplitude are excited by adjusting the length of the slot to realize circular polarization. By loading the U-shaped cavity below the radiation patch, the miniaturized, dual-band and high-gain right-hand circularly polarized antenna is finally realized, and the practical application requirements are met.
The invention provides a miniaturized dual-band high-gain right-hand circularly polarized microstrip antenna. The antenna has the characteristics of double frequency bands, high gain, miniaturization, good directional radiation, simple feeding mode and the like, can meet the requirements of a military communication mobile phone antenna, is conveniently placed at the top of the communication mobile phone antenna, and realizes cover lifting.
Claims (6)
1. The utility model provides a miniaturized high-gain dual-band right-hand circular polarized antenna which characterized in that: comprises an insulating medium substrate (1), a radiator (2) and a U-shaped metal back cavity (3); the radiator (2) is printed on the upper surface of the insulating medium substrate (1) in a plane;
the radiator (2) is rectangular, and the radiator (2) is provided with a first T-shaped slot hole (21), a second T-shaped slot hole (22), a third T-shaped slot hole (23) and a fourth T-shaped slot hole (24) which extend from the center of the radiator (2) to four sides and are uniformly distributed along the circumference taking the center of the radiator (2) as the center of the circle; the first T-shaped slot hole (21), the second T-shaped slot hole (22), the third T-shaped slot hole (23) and the fourth T-shaped slot hole (24) comprise a transverse slot hole and a vertical slot hole, the transverse slot hole is parallel to the side line of the radiator (2), and the vertical slot hole is perpendicular to the side line of the radiator (2);
a first rectangular slot (25) and a second rectangular slot (26) are arranged on the diagonal of the radiator (2), a first T-shaped radiator (4) is arranged in the first rectangular slot (25), and a second T-shaped radiator (5) is arranged in the second rectangular slot (26);
the first T-shaped radiator (4) comprises a first narrow-side radiation microstrip (41) and a first wide-side radiation microstrip (42); the first broadside radiating microstrip (42) is positioned at one end of the first narrow side radiating microstrip (41);
the first narrow-side radiating microstrip (41) has a width smaller than that of the first rectangular slot hole (25), and a space is reserved between the first wide-side radiating microstrip (42) and one end of the first rectangular slot hole (25);
the second T-shaped radiator (5) comprises a second narrow-side radiating microstrip (51) and a second wide-side radiating microstrip (52); the second broadside radiating microstrip (52) is positioned at one end of the second narrow side radiating microstrip (51);
the second narrow-side radiating microstrip (51) has a width smaller than that of the second rectangular slot hole (26), and a space is reserved between the second wide-side radiating microstrip (52) and one end of the second rectangular slot hole (26);
the U-shaped metal back cavity (3) is arranged right below the insulating medium substrate (1), and a feed structure is arranged in the U-shaped metal back cavity (3); the feed structure is electrically connected with the radiator (2);
the first T-shaped slot hole (21), the second T-shaped slot hole (22), the third T-shaped slot hole (23) and the fourth T-shaped slot hole (24) comprise a transverse slot hole and a vertical slot hole, and the width of the transverse slot hole is unequal to that of the vertical slot hole; the width of the transverse slotted hole is larger than that of the vertical slotted hole;
the lengths of vertical slots of every two symmetrical slots in the first T-shaped slot hole (21), the second T-shaped slot hole (22), the third T-shaped slot hole (23) and the fourth T-shaped slot hole (24) are equal, and the lengths of the vertical slots and the lengths of the transverse slots are unequal if the lengths of the vertical slots and the lengths of the transverse slots are asymmetrical.
2. The miniaturized high gain dual band right hand circularly polarized antenna of claim 1, wherein: the first rectangular slot (25) and the second rectangular slot (26) have the same width and length.
3. The miniaturized high gain dual band right hand circularly polarized antenna of claim 1, wherein: the first broadside radiation microstrip (42) and the second broadside radiation microstrip (52) have widths and lengths which are correspondingly equal; the distance between the first broadside radiating microstrip (42) and one end of the first rectangular slot (25) is equal to the distance between the second broadside radiating microstrip (52) and one end of the second rectangular slot (26).
4. The miniaturized high gain dual band right hand circularly polarized antenna of claim 1, wherein: the first broadside radiating microstrip (42) and the second broadside radiating microstrip (52) have equal widths; the first broadside radiating microstrip (42) and the second broadside radiating microstrip (52) have unequal lengths.
5. The miniaturized high gain dual band right hand circularly polarized antenna of claim 1, wherein: the U-shaped metal back cavity (3) is provided with a bottom plate (33) and two opposite side walls (32); the distance between the upper surface of the bottom plate (33) and the radiator (2) is smaller than 0.01λ, where λ is the wavelength of the low-frequency air.
6. The miniaturized high gain dual band right hand circularly polarized antenna of claim 5, wherein: the feed structure in the U-shaped metal back cavity (3) comprises a feed probe (31) arranged on a bottom plate (33) of the U-shaped metal back cavity (3); the feed probe (31) is fed coaxially with the radiator (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710578549.2A CN107359420B (en) | 2017-07-17 | 2017-07-17 | Miniaturized high-gain dual-band circularly polarized antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710578549.2A CN107359420B (en) | 2017-07-17 | 2017-07-17 | Miniaturized high-gain dual-band circularly polarized antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107359420A CN107359420A (en) | 2017-11-17 |
| CN107359420B true CN107359420B (en) | 2023-08-11 |
Family
ID=60292124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710578549.2A Active CN107359420B (en) | 2017-07-17 | 2017-07-17 | Miniaturized high-gain dual-band circularly polarized antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107359420B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109873249A (en) * | 2017-12-04 | 2019-06-11 | 北京自动化控制设备研究所 | A kind of micro-strip navigation antenna with air back chamber |
| CN108428997B (en) * | 2018-01-17 | 2020-08-21 | 深圳市华信天线技术有限公司 | Broadband planar antenna |
| CN109390669B (en) * | 2018-09-28 | 2020-09-25 | 湖北三江航天险峰电子信息有限公司 | Double-frequency antenna |
| CN112803136B (en) * | 2020-12-14 | 2022-06-03 | 苏州迈斯维通信技术有限公司 | Plane 5G low frequency and millimeter wave dual-band antenna with adjustable azimuth angle |
| CN117525895B (en) * | 2024-01-04 | 2024-04-12 | 深圳市亿道数码技术有限公司 | Broadband separation type antenna and mobile terminal |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832451A (en) * | 2012-09-18 | 2012-12-19 | 陕西海创中盈信息技术有限公司 | Wide-band miniaturized gain-controllable directional antenna and manufacturing method thereof |
| CN103022703A (en) * | 2012-12-25 | 2013-04-03 | 南京邮电大学 | Broadband cavity-backed double-slot microstrip antenna |
| CN105958189A (en) * | 2016-05-31 | 2016-09-21 | 桂林电子科技大学 | Small-size broadband antenna |
| CN205680784U (en) * | 2016-06-01 | 2016-11-09 | 中国电子科技集团公司第五十四研究所 | Zigzag crossed slit circular polarisation cavity-backed radiator antenna |
| CN106877003A (en) * | 2017-03-22 | 2017-06-20 | 桂林电子科技大学 | A kind of reflection-type ultra wide band Terahertz polarization restructural circular polarizer |
| CN106935963A (en) * | 2017-01-20 | 2017-07-07 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High isolation dual polarized circumferential weld microband antenna unit |
| CN207441973U (en) * | 2017-07-17 | 2018-06-01 | 桂林电子科技大学 | Miniaturization high-gain two-band circular polarized antenna |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9871296B2 (en) * | 2013-06-25 | 2018-01-16 | Huawei Technologies Co., Ltd. | Mixed structure dual-band dual-beam three-column phased array antenna |
-
2017
- 2017-07-17 CN CN201710578549.2A patent/CN107359420B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832451A (en) * | 2012-09-18 | 2012-12-19 | 陕西海创中盈信息技术有限公司 | Wide-band miniaturized gain-controllable directional antenna and manufacturing method thereof |
| CN103022703A (en) * | 2012-12-25 | 2013-04-03 | 南京邮电大学 | Broadband cavity-backed double-slot microstrip antenna |
| CN105958189A (en) * | 2016-05-31 | 2016-09-21 | 桂林电子科技大学 | Small-size broadband antenna |
| CN205680784U (en) * | 2016-06-01 | 2016-11-09 | 中国电子科技集团公司第五十四研究所 | Zigzag crossed slit circular polarisation cavity-backed radiator antenna |
| CN106935963A (en) * | 2017-01-20 | 2017-07-07 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High isolation dual polarized circumferential weld microband antenna unit |
| CN106877003A (en) * | 2017-03-22 | 2017-06-20 | 桂林电子科技大学 | A kind of reflection-type ultra wide band Terahertz polarization restructural circular polarizer |
| CN207441973U (en) * | 2017-07-17 | 2018-06-01 | 桂林电子科技大学 | Miniaturization high-gain two-band circular polarized antenna |
Non-Patent Citations (1)
| Title |
|---|
| 陈霞.基于CST的宽频带毫米波微带天线研究.《万方学术》.2016,第3-4章. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107359420A (en) | 2017-11-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107359420B (en) | Miniaturized high-gain dual-band circularly polarized antenna | |
| Dzagbletey et al. | Quarter-wave balun fed Vivaldi antenna pair for V2X communication measurement | |
| CN203103499U (en) | Ultra wide band printed antenna | |
| Parchin et al. | A closely spaced dual-band MIMO patch antenna with reduced mutual coupling for 4G/5G applications | |
| CN106654555B (en) | Small-size asymmetric high-isolation UWB-MIMO antenna | |
| AU2011354510A1 (en) | Antenna having external and internal structures | |
| Zhang et al. | Ultra-wideband dual-polarized antenna with three resonant modes for 2G/3G/4G/5G communication systems | |
| CN105048079A (en) | Omnidirectional circular polarization plane antenna | |
| Ojaroudiparchin et al. | Low-cost planar mm-Wave phased array antenna for use in mobile satellite (MSAT) platforms | |
| Sarkar et al. | A new compact printed antenna for mobile communication | |
| CN112490656A (en) | Small circularly polarized GPS-BD microstrip antenna with positioning capability | |
| CN207441973U (en) | Miniaturization high-gain two-band circular polarized antenna | |
| Chavali et al. | Wideband designs of regular shape microstrip antennas using modified ground plane | |
| Jagtap et al. | Gain and bandwidth enhancement of circularly polarized MSA using PRS and AMC layers | |
| Buravalli et al. | Simulation study of 2x3 microstrip patch antenna array for 5G applications | |
| Matsuno et al. | Slim omnidirectional orthogonal polarization MIMO antenna with halo and patch antennas on the cylindrical ground plane | |
| Pollayi et al. | Design and development of wide band dual-polarized magneto electric dipole antenna for mobile communications | |
| Nahar et al. | Low cost planar millimeter wave antenna array for 5G mobile applications | |
| Huang et al. | Compact and wideband dual-polarized antenna with high isolation for wireless communication | |
| Kumar et al. | A Christ Cross Slotted Antenna for 5G mm Waves Applications | |
| Shelke et al. | Dual-band microstrip patch antenna for wireless application | |
| Yadav et al. | Design of a Novel low-Cost High-Gain Dual-Polarized Antenna by suspended cylinder and shorting strips | |
| Emadian et al. | Modified ground circle like-slot antenna with dual band-notched characteristics for super UWB applications | |
| Bhadouria et al. | Multiband DGS based microstrip patch antenna for open satellite communication | |
| Islam et al. | Recent trends in printed Ultra-Wideband (UWB) antennas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20171117 Assignee: Guilin Jiuyu Technology Co.,Ltd. Assignor: GUILIN University OF ELECTRONIC TECHNOLOGY Contract record no.: X2023980045858 Denomination of invention: Miniaturized high gain dual band circularly polarized antenna Granted publication date: 20230811 License type: Common License Record date: 20231107 |
|
| EE01 | Entry into force of recordation of patent licensing contract |