WO2023057884A2 - Antenne de station de base 5g sub-ghz à double polarisation pour applications n-urbaines à faible mobilité - Google Patents

Antenne de station de base 5g sub-ghz à double polarisation pour applications n-urbaines à faible mobilité Download PDF

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Publication number
WO2023057884A2
WO2023057884A2 PCT/IB2022/059441 IB2022059441W WO2023057884A2 WO 2023057884 A2 WO2023057884 A2 WO 2023057884A2 IB 2022059441 W IB2022059441 W IB 2022059441W WO 2023057884 A2 WO2023057884 A2 WO 2023057884A2
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WIPO (PCT)
Prior art keywords
radiators
antenna
ghz
base station
sub
Prior art date
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PCT/IB2022/059441
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English (en)
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WO2023057884A3 (fr
Inventor
Divya Gudapati
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Divya Gudapati
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Publication date
Application filed by Divya Gudapati filed Critical Divya Gudapati
Publication of WO2023057884A2 publication Critical patent/WO2023057884A2/fr
Publication of WO2023057884A3 publication Critical patent/WO2023057884A3/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction

Definitions

  • the disclosed subject matter relates generally to base station antenna systems. More particularly, the present disclosure relates to a dual polarized Sub-GHz base station antenna at 700MHz for Low Mobility n-Urban/ Rural Area Applications.
  • Cellular base station antennas consist of independent antenna arrays are designed to exploit multiple features of radio access network technologies, such as long-term evolution and LTE-advanced.
  • Conventional Base Station (BTS) Antennas are deployed for each generation (for example, 2G, 3G, 4G) separately.
  • BTS antenna results in various installation challenges in terms of space, cost, size, interference, coverage, and network deployment. For example, some antenna designs have attempted to combine bands and extend bandwidth, but still many antennas are required due to the proliferation of air-interface standards and bands.
  • 5Gbase station installations will be denser than the previous generations due to the high frequency usage in 5G deployments and associated path losses in the free space.
  • Installation of 5G NR (New Radio) base stations along with existing 4G base stations are not thought off till date. Installing large number of 5G new radio base stations in addition to, the existing 4G base stations results in huge deployments of base station across a region. Independent 5G antennas if deployed adjacent to the existing 4G antennas on the same base station, the installation results in large size and produce adjacent channel interference and cross talk.
  • 5G NR New Radio
  • Another objective of the present disclosure is directed towards a dual polarized Sub-GHz base station antenna (100) at 700MHz for Low Mobility n-Urban applications to reuse the existing 4G LTE’s (Long Term Evolution) installation site to deploy 5G NR’s (New radio) gNB (Next generation Node B) for the fast deployment of 5G-NR system.
  • 4G LTE Long Term Evolution
  • 5G NR New radio
  • gNB Next generation Node B
  • Another objective of the present disclosure is directed towards a dual polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications that enables the radio frequency front end and remote radio head to be on the same platform with scaled version of carriers.
  • Another objective of the present disclosure is directed towards a dual polarized Sub-GHz base station antenna (100) that avoids large number of 5G new radio base station deployment, for large amount of radiation with the 5Gnew radio base station antenna element for Low Mobility n-Urban applications using the existing 4G LTE cell sites.
  • Another objective of the present disclosure is directed towards a dual polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications that avoids new radio base station cost and cell site maintenance.
  • Another objective of the present disclosure is directed towards a dual polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications that can be easily fabricated and has lightweight mechanism.
  • Another objective of the present disclosure is directed towards a dual polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications with a special feeding mechanism.
  • Another objective of the present disclosure is directed towards a dual polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications that provides high gain with larger coverage.
  • Another objective of the present disclosure is directed towards a compact dual polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications with high isolation with low cross talk.
  • Another objective of the present disclosure is directed towards a dual polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications that focuses on low mobility users in a set of villages and farms spread over a large area.
  • Another objective of the present disclosure is directed towards a dual polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications that enables high speed data transfer under 5G deployments in rural areas .
  • Another objective of the present disclosure is directed towards a dual polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications that has less complex structure and cost effective for Sub-GHz 5Gbase station applications.
  • a dual polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications comprising of two primary and secondary radiators are concatenated and oriented in a dual slant polarization and are grounded to a reflecting surface.
  • the two radiating elements operating in the 5G Sub- GHz (700 MHz) band are spaced at X/4 from the reflecting surface provides unidirectional radiation pattern with high isolation arranges radio frequency channel capacity significantly increases for 5G standalone requirement (SA) and Non- standalone (NS A) requirement;
  • the two radiators are developed to receive signals from a feeding network and radiate them into a free space, to the fullest extent without sending the signals back to a signal source.
  • the dual polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications comprising of two orthogonal radiators are excited with two feed lines connected to SMA connectors to give radio frequency input signal.
  • the dual polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications comprising the reflecting surface is grounded by drilling the ground plane with eight holes for integrating the radiators, two for fixing the teflon spacers for handling the high power and six for holdingthe connectors, configured to combine forward andbackwards traversing fields in phase and exhibit a uni-directional radiation beam.
  • FIG. 1 is a diagram depicting an example environment in which aspects of the present disclosure can be implemented. Specifically, FIG. 1 depicting an isomeric view of a dual polarized sub-GHz 5Gbase station antenna (100) for low mobility n-Urban applications, in accordance with one or more exemplary embodiments of the present disclosure.
  • FIG. 2 is a diagram depicting an example environment in which aspects of the present disclosure can be implemented. Specifically, FIG. 2 depicting top view of radiators, in accordance with one or more exemplary embodiments of the present disclosure.
  • FIG. 3 is a diagram depicting an example environment in which aspects of the present disclosure can be implemented. Specifically, FIG. 3 depicting an antenna feeding mechanism, in accordance with one or more exemplary embodiments of the present disclosure.
  • FIG. 4 is a diagram depicting an example environment in which aspects of the present disclosure can be implemented. Specifically, FIG. 4 depicting a metallic ground plane with sixteen holes for fixing the radiators, non-metallic spacers and SMA connectors, in accordance with one or more exemplary embodiments of the present disclosure.
  • FIG. 5 is a diagram depicting an example environment in which aspects oflhe present disclosure can be implemented. Specifically, FIG 5 depicting an assembly workflow, in accordance with one or more exemplary embodiments of the present disclosure.
  • FIG 6 illustrates a return loss graph, in accordance with one or more exemplary embodiments of the present disclosure.
  • FIG. 7 illustrates a voltage standing wave ratio graph, in accordance with one or more exemplary embodiments of the present disclosure.
  • FIG. 8 illustrates an isolation graph, in accordance with one or more exemplary embodiments of the present disclosure.
  • FIG. 9 illustrates a radiation pattern at 700MHz, in accordance with one or more exemplary embodiments of the present disclosure.
  • FIG. 10 is a flow chart illustrating a method of assembling the dual polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications, in accordance with one or more exemplary embodiments of the present disclosure.
  • FIG. 1 is a diagram 100 depicting an example environment in which aspects of the present disclosure can be implemented.
  • FIG. 1 depicting an isomeric view of a dual polarized Sub-GHz base station antenna for Low Mobility n-Urban applications in accordance with one or more exemplary embodiments of the present disclosure.
  • the isomeric view of the dual polarized base station antenna for Low Mobility n-Urban applications 100 includes radiators 102a, 102b, 102c, 102d, feeds 104a, 104b, and a metallic ground plane 106.
  • the dual polarized base station antenna 100 is configured with 5G base station at 700MHz for rural area applications.
  • the dual polarized base station antenna 100 further includes radiating elements with a special feeding mechanism.
  • the radiating elements are beveled and folded at the ends of the radiators 102a, 102b, 102c, 102d with half circular disc’s and are grounded by a reflecting surface.
  • This arrangement combines the forward and backward traversing fields in phase and exhibit a bi-directional radiation pattern to highly uni-directional radiation pattern.
  • folded half circular disc perturbations in the signal line leads to miniaturization of the antenna 100.
  • the dual polarized sub-GHz 5 G base station antenna for low mobility n-urban applications 100 is miniaturized and maintained a symmetrical structure to improve the polarization diversity in the slant ⁇ 45° orientation and high resonant stability and incident angle in dependency.
  • the metallic ground plane 106 is an Aluminum metallic plate with thickness 2mm.
  • the dual polarized Sub-GHz base station antenna for Low Mobility n-Urban applications 100 may be widely used in military and telecommunication applications for better efficiency.
  • the radiating elements oriented in a slant ⁇ 45° polarization fashion to operate at 5G Sub-GHz ( ⁇ 1 GHz) lower band operation.
  • the dual polarized base station antenna for Low Mobility n-Urban applications 100 is backed by the perfect electric conductor (PEC) as a reflector (shown in the drawings, 106 in FIG.1, 400 and 506 in FIG 5) radiating elements are placed at X/4 distance from the ground plane provides high isolation, arranges the significant increase in RF channel capacity for 5G for both Standalone (SA) and Non-standalone (NSA) requirements.
  • PEC perfect electric conductor
  • dual polarized base station antenna for Low Mobility n-Urban applications 100 is made possible for 5G Sub-GHz ( ⁇ 1 GHz) lower frequency band by the proposed unique configuration is by introducing folded half circular disc radiators in the signal line with reflecting surface.
  • the two radiating elements 102a, 102b, 102c, 102d are L-Shaped Folded Petal Shaped Radiators formed by bevelling and folding the secondary radiator, which is concatenated with the rectangular primary radiator.
  • the radiators 102a, 102b, 102c, 102d placed A/4 distance above the metallic ground plane 106 provides unidirectional radiation pattern as per 3 GPP requirements.
  • Non-metallic spacers may be used to provide the mechanical support to the feed structure.
  • the dual polarized base station antenna 100 is designed to work for 5G Sub-GHz band for low mobility n-Urban applications with the bandwidth of 100 MHz.
  • the prototype of the reflector has been fabricated and integrated with the dual polarized base station antenna for Low Mobility n-Urban applications 100 with stable radiation characteristics. Experiments may be carried out for characterizing its reflection and Isolation characteristics.
  • FIG. 2 is a diagram 200 depicting an example environment in which aspects of the present disclosure can be implemented. Specifically, FIG. 2 depicting top view of radiators 202a, 202b, 202c, 202d in accordance with one or more exemplary embodiments of the present disclosure.
  • FIG. 3 is a diagram 300 depicting an example environment in which aspects of the present disclosure can be implemented.
  • FIG. 3 depicting an antenna feeding mechanism, in accordance with one or more exemplary embodiments of the present disclosure.
  • the antenna feeding mechanism 300 includes feeds 304a, 304b, and connectors 308a, 308b.
  • the connectors 308a, 308b may be excited with 5G low frequency signal for the user specified modulation and frequency.
  • the feed lines 304a, 304b connected to the 50 Ohms SMA connector 308a, 308b guide the signals and excite the radiators 102a, 102b, 102c, 102d.
  • the radiators 102a, 102b, 102c, 102d that are designed to operate at 5G Sub-GHz lower band, receive the signals and subsequently radiate them into free space.
  • the radiators 102a, 102b, 102c, 102d are designed to receive the signals from the feeding network and radiate them into the free space, to the fullest extent without sending the signals back to the signal source thus exhibiting highest possible efficiency.
  • the electromagnetic fields emanated from the radiator 102a, 102b, 102c, 102d are bidirectional. This arrangement combines the forward and backward traversing fields in phase and exhibit a single highly unidirectional radiation beam.
  • a highly directional radiation is made possible for 5G lower frequency band by the proposed unique configuration is by introducing folded half circular disc radiators
  • FIG. 4 is a diagram 400 depicting an example environment in which aspects of the present disclosure can be implemented.
  • FIG. 4 depicting a metallic ground plane, in accordance with one or more exemplary embodiments of the present disclosure.
  • the metallic ground plane 400 includes clearance for the inner pin 410a, 410b, radiators holes 410c, 41 Od, 41 Oe, 41 Of, 410g 410h, 41 Oi, 410j, Teflon spacer holes 410k, 4101 and the two coaxial connector four holes 410m, 41 On, 41 Oo, 41 Op.
  • FIG. 5 is diagram 500 depicting an example environment in which aspects of the present disclosure can be implemented. Specifically, FIG. 5 depicting an assembly workflow, in accordance with one or more exemplary embodiments of the present disclosure.
  • Two orthogonal radiators 502a, 502b beveled with folded half circular discs at the end of the radiators 502c, 502d are grounded by the reflecting surface 506 drilled with 8 holes with dual feeding mechanisms at one quarter wavelength from the radiator 502a, 502b, 502c, 502d to create stable and directional radiation characteristics.
  • Special feed lines 504a, 504b are designed to excite orthogonal radiators 502a, 502b, 502c, 502d thereby to generate dual polarization.
  • the feed lines 504a, 504b may be connected to SMA connector centre conductors to give radio frequency input to the feed lines 504a, 504b.
  • Two holes may be drilled on the metallic ground plane 506 to give a clearance to a centre conductor of the SMA connectors. Electrical contact may be made by soldering the feed line 504a, 504b and connectors with the radiating elements and PEC respectively.
  • Theradiators 102a, 102b, 102c, 102d may be maintained at a height of 10cm from the metallic ground plane 506 with Teflon non-metallic spacers 512a, 512b f or f eeds and drilled from into the metallic ground plane 506.
  • FIG. 6 is an example diagram 600 depicting a return loss graph, in accordance with one or more exemplary embodiments of the present disclosure.
  • the return loss graph 600 includes frequency values 602 in MHz frequency range and power values 604 in decibels.
  • the Sn and S22 curves depicted in the Fig. 6 indicates the dual polarized Sub-GHz 5Gbase station antenna is operating in the Sub-GHz ( ⁇ 1 GHz) with a bandwidth of 100 MHz
  • FIG. 7 is an example diagram 700 depicting a voltage standing wave ratio graph, in accordance with one or more exemplary embodiments of the present disclosure.
  • the voltage standing wave ratio graph 700 includes frequency values 702 and voltage standing wave ratio values 704. It is observed thatthe VSWR values for the two radiators in the desired frequency range is ⁇ 2.
  • FIG. 8 is an example diagram 800 depicting isolation graph, in accordance with one or more exemplary embodiments of the present disclosure.
  • the isolation graph 800 includes frequency values 802, andisolation values 804 in decibels.
  • the isolation level of ⁇ 30 dB is achieved in the desired Sub-GHz frequency range. High isolation level in the lower frequency band avoids cross talk/interference.
  • FIG. 9 is an example diagram 900 depicting radiation pattern at 700MHz, in accordance with one or more exemplary embodiments of the present disclosure.
  • the radiation pattern 900 includes a co-polarization in E-plane 902, a cross- polarization in E-plane 904, a co-polarization in H-plane 906, and a cross-polarization in H-plane 908.
  • the proposed dual polarized Sub-GHz base station antenna for Low Mobility n-Urban applications provides highly uni-directional radiation pattern with a high gain of 10 dB, covering larger area with a broad beam width of 73° provided low cross-polarization levels below -40 dB in E and H planes, for cellular wireless rural area applications.
  • FIG. 10 is an example flow chart 1000 depicting a method of assembling the dual polarized Sub-GHz base station antenna for Low Mobility n-Urban applications, in accordance with one or more exemplary embodiments of the present disclosure.
  • the method 300 is carried out in the context of the details of FIG. 1, and FIG. 2. However, the method 300 is carried out in any desired environment Further, the definitions are equally applied to the description below.
  • the method commences at step 1002, beveling and folding the radiating elements with folded half circular discs at the end of the radiators. Thereafter, step 1104, orthogonal radiators are grounded by drilling the holes in the reflecting surface and fed with dual feeding mechanisms at one quarter wavelength from the radiators to create stable and directional radiation characteristics. Thereafter, at step 1 006, connecting the feed lines to SMA (Sub Miniature Version A) connector center conductors, to give radio frequency input to the feed lines. Thereafter, at step 1008, drilling the holes on the ground plane to give a clearance to centre conductor of the SMA connectors. Thereafter, at step 1010, soldering the feed lines with the SMA connectors and radiating elements are connected to the ground plane to make an electrical contact.
  • SMA Subscribe Miniature Version A
  • a dual-polarized Sub-GHz base station antenna (100) for Low Mobility n-Urban applications comprising: two primary radiators which are concatenated and oriented in a dual slant polarized with two secondary radiators and all the radiators are grounded to a reflecting surface; two radiating elements which are spaced at X/4 from the reflecting surface operating in the 5G Sub-GHz (700 MHz) band; reflecting plane which is drilled with sixteen holes to integrate the radiators, spacersand SMA (SubMiniature Version A) connectors with the ground plane; two feed lines soldered to the radiators are arranged in a criss-cross manner to provide excitation to the radiators, two non-metallic spacers which are used to provide mechanical support to the feed lines; and the Sub GHz 5G antenna is less complex, cost-effective, and easy to fabricate.
  • the antenna as claimed in claim 1 wherein the two rectangular primary radiators are concatenated with the folded petal-shaped secondary radiators are formed by bevelling, folding, and attached to the primary radiators to make the Sub-GHz antenna compact.
  • the antenna as claimed in claim 1 wherein the said radiating elements are oriented in a slant ⁇ 45° polarization to provide 43 dB isolation when fed with a special dual feeding mechanism.
  • said antenna provides wide bandwidth of 100 MHz (670-730 MHz) with a broad beam to cover more significant cell site for 5G communications.
  • the antenna as claimed in claim 1 wherein the electromagnetic fields emanating from the antenna, provides larger coverage with a high gain of 10 dBi.
  • a method of fabrication and assembly of the dual polarized Sub -GHz base station antenna (100) for Low Mobility n-Urban applications comprising: the primary radiator is formed by cutting the rectangular strip from a planar metal sheet; secondary radiator is formed by double bevelling on one side of the rectangular sheet and cutting the half circular disc shape to form a petal-shaped structure on the other side of the rectangular sheet, and 90° folding at the center of the sheet; secondary radiator is concatenated with the primary radiator to form a single radiating element; two pairs of radiating elements are oriented in dual slant ( ⁇ 45°) configuration which are spaced at one quarter wavelength from the ground reflecting surface; and the radiators are screwed with the ground reflecting surface for the perfect electrical contact.
  • the ground reflecting surface is configured as a Perfect Electric Conductor (PEC) to reflect the 5G 700 MHz band. Screwing the two non-metallic spacers on the ground plane to provide mechanical support for the feedlines; soldering the dual slant polarized feed lines with two RF connectors for exciting the radiators, which makes the antenna rigid.
  • PEC Perfect Electric Conductor

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Waveguide Aerials (AREA)

Abstract

Une antenne de station de base 5G sub-GHz à double polarisation pour des applications de zone n-urbaine/rurale à faible mobilité à 700 MHz, comprenant : des éléments rayonnants étant biseautés et pliés au niveau d'extrémités avec des disques semi-circulaires étant mis à la terre par une surface réfléchissante, les éléments rayonnants étant développés pour recevoir des signaux en provenance d'un réseau d'alimentation et les faire rayonner dans un espace libre, jusqu'à la plus grande mesure sans renvoyer les signaux à une source de signal, les éléments rayonnants orthogonaux étant percés et mis à la terre par une surface réfléchissante avec des trous ayant des mécanismes d'alimentation doubles à un quart de longueur d'onde provenant des éléments rayonnants pour créer un rayonnement stable et hautement directionnel ; des connecteurs SMA sont connectés aux lignes d'alimentation pour donner une entrée radiofréquence aux éléments rayonnants, les lignes d'alimentation étant conçues pour exciter les éléments rayonnants, les lignes d'alimentation étant brasées avec les connecteurs SMA et les éléments rayonnants.
PCT/IB2022/059441 2021-10-05 2022-10-04 Antenne de station de base 5g sub-ghz à double polarisation pour applications n-urbaines à faible mobilité WO2023057884A2 (fr)

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IN202141045273 2021-10-05
IN202141045273 2021-10-05

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US8558747B2 (en) * 2010-10-22 2013-10-15 Dielectric, Llc Broadband clover leaf dipole panel antenna
KR102635791B1 (ko) * 2016-12-21 2024-02-08 인텔 코포레이션 무선 통신 기술, 장치 및 방법
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