WO2023064774A1 - Frequency selective parasitic director for improved midband performance and reduced c-band/cbrs interference - Google Patents

Frequency selective parasitic director for improved midband performance and reduced c-band/cbrs interference Download PDF

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Publication number
WO2023064774A1
WO2023064774A1 PCT/US2022/077913 US2022077913W WO2023064774A1 WO 2023064774 A1 WO2023064774 A1 WO 2023064774A1 US 2022077913 W US2022077913 W US 2022077913W WO 2023064774 A1 WO2023064774 A1 WO 2023064774A1
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WO
WIPO (PCT)
Prior art keywords
band
director
cbrs
ring
radiators
Prior art date
Application number
PCT/US2022/077913
Other languages
French (fr)
Inventor
Evan WAYTON
Anoop TIWARI
Original Assignee
John Mezzalingua Associates, LLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by John Mezzalingua Associates, LLC filed Critical John Mezzalingua Associates, LLC
Publication of WO2023064774A1 publication Critical patent/WO2023064774A1/en

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Classifications

    • 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
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • H01Q5/42—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more imbricated arrays
    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • 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
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/061—Two dimensional planar arrays
    • H01Q21/062—Two dimensional planar arrays using dipole aerials
    • 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
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements

Definitions

  • the present invention relates to wireless communications, and more particularly, to highly densified compact antennas that operate in multiple frequency bands.
  • a given multiband antenna may have a combination of LB, MB, CBRS and/or C-Band.
  • the presence of a director in close proximity with a dipole of a higher frequency band may cause interference through re-radiation, whereby RF energy radiated by the higher frequency dipole may cause current excitation in the director of the lower band, which may in turn result in secondary RF radiation from the director that may interfere with the gain pattern of the higher frequency band.
  • This problem may be exacerbated when placing, for example, MB dipoles and C-Band/CBRS dipoles in close proximity to each other.
  • An aspect of the present disclosure involves a multiband antenna.
  • the multiband antenna comprises a plurality of high band radiators; and a plurality of midband radiator assemblies, each of the midband radiator assemblies having a dipole and a director disposed above the dipole, each director having a conductive plate, wherein the conductive plate includes a set of features that prevents electromagnetic coupling with the plurality of high band radiators.
  • FIG. 1 A illustrates an exemplary antenna array face layout having two columns of MB radiator assemblies, a C-Band 8T8R (eight transmit eight receive) array, and two narrowband CBRS columns, wherein each MB radiator assembly has an exemplary director according to the disclosure.
  • FIG. IB illustrates an exemplary antenna array face having two columns of MB radiator assemblies, two low band (LB) radiators, as two CBRS arrays, wherein each MB radiator assembly has an exemplary director according to the disclosure.
  • FIG. 2A illustrates an MB radiator assembly having a conventional director.
  • FIG. 2B illustrates a conventional director as used by the MB radiator of FIG. 2 A.
  • FIG. 3 A illustrates an exemplary MB radiator assembly having an exemplary director according to a first embodiment of the disclosure.
  • FIG. 3B illustrates the exemplary director of the MB radiator assembly of FIG 3 A.
  • FIG. 3C illustrates the exemplary MB director of FIG. 3B with further details including dimensions.
  • FIG. 4A illustrates an exemplary MB radiator assembly having an exemplary director according to a second embodiment of the disclosure.
  • FIG. 4B illustrates the exemplary director of the MB radiator assembly of FIG. 4A.
  • FIG. 4C illustrates the exemplary MB director of FIG. 4B with further details including dimensions.
  • FIG. 5 illustrates a cross section of the directors of FIG. 3C and FIG. 4C, including the thicknesses and materials of each layer.
  • FIG. 6 is a plot of return loss values for a single MB radiator assemblies disclosed, as a function of frequency.
  • FIG. 7 is a plot of return loss for an exemplary full MB array as illustrated in FIG. IB.
  • FIG. 1 A illustrates an exemplary antenna array face layout 100a having two columns of MB radiator assemblies 105, a C-Band 8T8R (eight transmit eight receive) array having a plurality of C-Band radiators 115 (1695-2700 MHz), and two narrowband CBRS columns 110 (3.4-3.7 GHz), wherein each MB radiator assembly 105 has an exemplary director according to the disclosure, wherein the director is provided to improve the bandwidth performance of the MB radiator by reducing the return loss over the bandwidth.
  • the MB radiator assemblies 105 are in close proximity to the C-band radiators 115 (3.7-3.2 GHz), providing for a compact antenna area for dense urban environments and optimal wind loading.
  • FIG. IB illustrates another exemplary antenna array face 100b having two columns of MB radiator assemblies 105, two low band (LB) radiators 125, as two CBRS arrays 120, wherein each MB radiator assembly 105 has an exemplary director according to the disclosure.
  • the MB radiator assemblies 105 are in close proximity to the CBRS arrays 120.
  • the MB radiator assemblies 105 are not as close in proximity to the CBRS arrays 120 in antenna array face 100b as they are to the C-Band radiators in antenna array face 100a, they are close enough for interference, such as coupling and re-radiation of C- Band/CBRS energy by the directors in the MB radiator assemblies 105.
  • FIG. 2 A illustrates an exemplary MB radiator assembly 105a having a conventional director 215.
  • MB radiator assembly 105a has a folded dipole 205, which may radiate two distinct signals at orthogonal polarizations (e.g., +/- 45degrees) in midband frequencies.
  • Folded dipole Further discussion on the technology of folded dipoles may be found in co-owned patent application PCT/US21/049347, HIGH PERFORMANCE DIPOLE FOR MULTIBAND ANTENNAS, which is incorporated by reference as if fully disclosed herein.
  • Folded dipole 205 may be affixed to a dipole stem 220, which provides signal feeds to the conductors of the folded dipole 205.
  • Folded dipole 205 may also support a director clip 210, which in turn may support director 215.
  • FIG. 2B illustrates conventional director 215.
  • Conventional dipole has a PCB substrate 217 on which is disposed a conductive plate 225.
  • Disposed at the center of director 215 is a clip-on feature 230, which engages director 215 and affixes it above folded dipole 205 at a predetermined height.
  • director clip 210 has a plurality of protrusions that enable director 215 to be affixed at one of a range of selected heights above folded dipole 205.
  • FIG. 3 A illustrates an exemplary MB radiator assembly 105b having an exemplary director 315 according to a first embodiment of the disclosure.
  • the folded dipole 205, dipole stem 220, and director clip 210 of FIG. 3 A may be identical to the corresponding components of FIG. 2 A.
  • FIG. 3B illustrates exemplary director 315 according to the disclosure.
  • Director 315 has a PCB substrate 317, on which is affixed a conductive plate 325.
  • Director 315 also has a clip-on feature 330, which may be identical to and have the same functionality of clip-on feature 230 of FIG. 2B.
  • conductive plate 325 has a plurality of slots 335.
  • FIG. 3C further illustrates exemplary director 315, including the dimensions of the substrate 317 and the conductive plate 325 as well as dimensions of slots 335. All linear dimensions in FIG. 3C are in inches.
  • the slots 335 in conductive plate 325 prevent a current from being induced by RF energy radiated by nearby C-Band radiators or CBRS radiators from inducing a current in conductive plate 315.
  • conductive plate 325 of director 315 provides all of the performance enhancement of folded dipole 205 of MB radiator assembly 105 c.
  • FIG. 4A illustrates an exemplary MB radiator assembly 105c having an exemplary director 415 according to the disclosure.
  • the folded dipole 205, dipole stem 220, and director clip 210 of FIG. 4A may be identical to the corresponding components of FIGs. 2A and 3 A.
  • FIG. 4B illustrates exemplary director 415 according to the disclosure.
  • Director 415 has a PCB substrate 417, on which is affixed a conductive plate 415.
  • Director 415 also has a clip-on feature 430, which may be identical to and have the same functionality of clip-on features 330 and 230 of FIGs. 3B and 2B, respectively.
  • conductive plate 425 has a pattern having a plurality of FSS (frequency selective surface) ring features 440 and 450.
  • FSS ring features 450 and 550 respectively have ring stems 445 and 455, each having a different length, enabling the placement of FSS ring features 440 and 450 at a higher density having alternating lengths.
  • Each FSS ring feature 440 and 450 has an inner ring 460 and an outer ring 465. As illustrated, outer rings 465 are coupled to either ring stem 445 (forming FSS ring feature 440) or ring stem 455 (forming FSS ring feature 450).
  • FIG. 4C further illustrates exemplary director 415, including dimensions of the PCB substrate 417 and conductive plate 425. Further provided are dimensions for the placement of FSS ring features 440 and 450. FIG. 4C also has a close up view 400, which includes dimensions for ring stems 445/455, inner ring 460, and outer ring 465. All linear dimensions in FIG. 4C are in inches.
  • the pattern of conductive plate 425 of exemplary director 415 provides for improved performance of the MB radiator assemblies 105 while being effectively transparent to the C-Band radiators 115, CBRS columns 110, and CBRS arrays 120.
  • the features of conductive plate 425 e.g., the dimensions, number, and placement of FSS ring features 450 and 550
  • Director 415 may also be tuned by altering the widths and separations of inner rings 460 and outer rings 465. These rings offer greater flexibility in matching the capacitive and inductive impedances independently.
  • FIG. 5 illustrates a cross section of the directors 315/415, including the thicknesses and materials the PCB substrate 317/417 and conductive plate 325/425.
  • FIG. illustrates a set of return loss plots over the MB frequency range.
  • Return loss plot 605 corresponds to MB radiator assembly 105a having conventional director 215;
  • return loss plot 615 corresponds to MB radiator assembly 105b having exemplary director 315;
  • return loss plot 610 corresponds to MB radiator assembly 105c having exemplary director 415.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

Disclosed are embodiments of a parasitic director that may be deployed with mid band radiators in a multiband antenna, wherein the exemplary directors improve the performance of the mid band radiator assembly in terms of and return loss, while being rendered effectively transparent to nearby C-Band or CBRS radiators. Adding the features helps in suppressing the radiating resonance modes originating from parasitics. Also, a sharper null may be achieved at the edges of the pass-band frequency offering higher frequency selectivity. Such embodiments enable broadening of C-band/CBRS beams in Azimuth plane thereby eliminating any secondary interference. This enables denser packing of radiators of different frequency bands while mitigating interference and 3dB beamwidth degradation due to higher band (e.g., C-Band or CBRS) coupling and reradiating from the mid band parasitic components.

Description

FREQUENCY SELECTIVE PARASITIC DIRECTOR FOR IMPROVED MIDBAND PERFORMANCE AND REDUCED C-BAND/CBRS INTERFERENCE
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of priority to U.S. Provisional Application 63/254,235, filed October 11, 2021, which is incorporated by reference herein in its entirety.
BACKGROUND OF THE INVENTION
Field of the invention
[0001] The present invention relates to wireless communications, and more particularly, to highly densified compact antennas that operate in multiple frequency bands.
Related Art
[0002] The introduction of new spectrum for cellular communications presents challenges for antenna designers. In addition to the traditional low band (LB) and mid band (MB) frequency regimes (617-960 MHz and 1695-2690 MHz, respectively), the introduction of C-Band and CBRS (Citizens Broadband Radio Service) provides additional spectrum of 3.7-4.2 GHz and 3.4-3.7 GHz, respectively. A given multiband antenna may have a combination of LB, MB, CBRS and/or C-Band.
[0003] The inclusion of these multiple band combinations in a single antenna creates technical challenges because there are stringent space and volume constraints on modern antennas. For example, wind loading requirements and increasing antenna deployments in dense urban settings both, individually or in combination, require antenna designers to pack more radiators for each band subarray, and multiple bands into tighter spaces. The spacing between the arrays of the different bands leads to considerable problems with cross-band interference as well as the need for improved performance within each band. [0004] Improved performance within a given band may be accomplished by utilizing passive radiators, (e.g., directors), that increase the bandwidth of a given dipole. However, the presence of a director in close proximity with a dipole of a higher frequency band may cause interference through re-radiation, whereby RF energy radiated by the higher frequency dipole may cause current excitation in the director of the lower band, which may in turn result in secondary RF radiation from the director that may interfere with the gain pattern of the higher frequency band. This problem may be exacerbated when placing, for example, MB dipoles and C-Band/CBRS dipoles in close proximity to each other.
[0005] Accordingly, what is needed is a director that improves the performance of its corresponding frequency band while being electrically transparent to the higher frequency bands.
SUMMARY OF THE DISCLOSURE
[0006] An aspect of the present disclosure involves a multiband antenna. The multiband antenna comprises a plurality of high band radiators; and a plurality of midband radiator assemblies, each of the midband radiator assemblies having a dipole and a director disposed above the dipole, each director having a conductive plate, wherein the conductive plate includes a set of features that prevents electromagnetic coupling with the plurality of high band radiators.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 A illustrates an exemplary antenna array face layout having two columns of MB radiator assemblies, a C-Band 8T8R (eight transmit eight receive) array, and two narrowband CBRS columns, wherein each MB radiator assembly has an exemplary director according to the disclosure.
[0011] FIG. IB illustrates an exemplary antenna array face having two columns of MB radiator assemblies, two low band (LB) radiators, as two CBRS arrays, wherein each MB radiator assembly has an exemplary director according to the disclosure.
[0012] FIG. 2A illustrates an MB radiator assembly having a conventional director.
[0013] FIG. 2B illustrates a conventional director as used by the MB radiator of FIG. 2 A.
[0014] FIG. 3 A illustrates an exemplary MB radiator assembly having an exemplary director according to a first embodiment of the disclosure.
[0015] FIG. 3B illustrates the exemplary director of the MB radiator assembly of FIG 3 A.
[0016] FIG. 3C illustrates the exemplary MB director of FIG. 3B with further details including dimensions.
[0017] FIG. 4A illustrates an exemplary MB radiator assembly having an exemplary director according to a second embodiment of the disclosure.
[0018] FIG. 4B illustrates the exemplary director of the MB radiator assembly of FIG. 4A.
[0019] FIG. 4C illustrates the exemplary MB director of FIG. 4B with further details including dimensions.
[0020] FIG. 5 illustrates a cross section of the directors of FIG. 3C and FIG. 4C, including the thicknesses and materials of each layer.
[0021] FIG. 6 is a plot of return loss values for a single MB radiator assemblies disclosed, as a function of frequency.
[0022] FIG. 7 is a plot of return loss for an exemplary full MB array as illustrated in FIG. IB.
DESCRIPTION OF EXEMPLARY EMBODIMENTS
[0020] FIG. 1 A illustrates an exemplary antenna array face layout 100a having two columns of MB radiator assemblies 105, a C-Band 8T8R (eight transmit eight receive) array having a plurality of C-Band radiators 115 (1695-2700 MHz), and two narrowband CBRS columns 110 (3.4-3.7 GHz), wherein each MB radiator assembly 105 has an exemplary director according to the disclosure, wherein the director is provided to improve the bandwidth performance of the MB radiator by reducing the return loss over the bandwidth. As illustrated, the MB radiator assemblies 105 are in close proximity to the C-band radiators 115 (3.7-3.2 GHz), providing for a compact antenna area for dense urban environments and optimal wind loading.
[0021] FIG. IB illustrates another exemplary antenna array face 100b having two columns of MB radiator assemblies 105, two low band (LB) radiators 125, as two CBRS arrays 120, wherein each MB radiator assembly 105 has an exemplary director according to the disclosure. In this exemplary embodiment, the MB radiator assemblies 105 are in close proximity to the CBRS arrays 120. Although the MB radiator assemblies 105 are not as close in proximity to the CBRS arrays 120 in antenna array face 100b as they are to the C-Band radiators in antenna array face 100a, they are close enough for interference, such as coupling and re-radiation of C- Band/CBRS energy by the directors in the MB radiator assemblies 105.
[0022] FIG. 2 A illustrates an exemplary MB radiator assembly 105a having a conventional director 215. MB radiator assembly 105a has a folded dipole 205, which may radiate two distinct signals at orthogonal polarizations (e.g., +/- 45degrees) in midband frequencies. Folded dipole Further discussion on the technology of folded dipoles may be found in co-owned patent application PCT/US21/049347, HIGH PERFORMANCE DIPOLE FOR MULTIBAND ANTENNAS, which is incorporated by reference as if fully disclosed herein. Folded dipole 205 may be affixed to a dipole stem 220, which provides signal feeds to the conductors of the folded dipole 205. Folded dipole 205 may also support a director clip 210, which in turn may support director 215.
[0023] FIG. 2B illustrates conventional director 215. Conventional dipole has a PCB substrate 217 on which is disposed a conductive plate 225. Disposed at the center of director 215 is a clip-on feature 230, which engages director 215 and affixes it above folded dipole 205 at a predetermined height. As illustrates, director clip 210 has a plurality of protrusions that enable director 215 to be affixed at one of a range of selected heights above folded dipole 205.
[0024] FIG. 3 A illustrates an exemplary MB radiator assembly 105b having an exemplary director 315 according to a first embodiment of the disclosure. The folded dipole 205, dipole stem 220, and director clip 210 of FIG. 3 A may be identical to the corresponding components of FIG. 2 A.
[0025] FIG. 3B illustrates exemplary director 315 according to the disclosure. Director 315 has a PCB substrate 317, on which is affixed a conductive plate 325. Director 315 also has a clip-on feature 330, which may be identical to and have the same functionality of clip-on feature 230 of FIG. 2B. As illustrated, conductive plate 325 has a plurality of slots 335.
[0026] FIG. 3C further illustrates exemplary director 315, including the dimensions of the substrate 317 and the conductive plate 325 as well as dimensions of slots 335. All linear dimensions in FIG. 3C are in inches.
[0027] The slots 335 in conductive plate 325 prevent a current from being induced by RF energy radiated by nearby C-Band radiators or CBRS radiators from inducing a current in conductive plate 315. By suppressing any induced current, conductive plate 325 of director 315 provides all of the performance enhancement of folded dipole 205 of MB radiator assembly 105 c.
[0028] FIG. 4A illustrates an exemplary MB radiator assembly 105c having an exemplary director 415 according to the disclosure. The folded dipole 205, dipole stem 220, and director clip 210 of FIG. 4A may be identical to the corresponding components of FIGs. 2A and 3 A.
[0029] FIG. 4B illustrates exemplary director 415 according to the disclosure. Director 415 has a PCB substrate 417, on which is affixed a conductive plate 415. Director 415 also has a clip-on feature 430, which may be identical to and have the same functionality of clip-on features 330 and 230 of FIGs. 3B and 2B, respectively. Further, conductive plate 425 has a pattern having a plurality of FSS (frequency selective surface) ring features 440 and 450. FSS ring features 450 and 550 respectively have ring stems 445 and 455, each having a different length, enabling the placement of FSS ring features 440 and 450 at a higher density having alternating lengths. Each FSS ring feature 440 and 450 has an inner ring 460 and an outer ring 465. As illustrated, outer rings 465 are coupled to either ring stem 445 (forming FSS ring feature 440) or ring stem 455 (forming FSS ring feature 450).
[0030] FIG. 4C further illustrates exemplary director 415, including dimensions of the PCB substrate 417 and conductive plate 425. Further provided are dimensions for the placement of FSS ring features 440 and 450. FIG. 4C also has a close up view 400, which includes dimensions for ring stems 445/455, inner ring 460, and outer ring 465. All linear dimensions in FIG. 4C are in inches.
[0031] The pattern of conductive plate 425 of exemplary director 415, similar to director 315, provides for improved performance of the MB radiator assemblies 105 while being effectively transparent to the C-Band radiators 115, CBRS columns 110, and CBRS arrays 120. The features of conductive plate 425 (e.g., the dimensions, number, and placement of FSS ring features 450 and 550) may be modified to tune director 415 across the bandwidth of MB radiator assembly 105. Director 415 may also be tuned by altering the widths and separations of inner rings 460 and outer rings 465. These rings offer greater flexibility in matching the capacitive and inductive impedances independently. Tuning these features accordingly may improve the return loss over the bandwidth while maintaining the transparency of director 415 [0032] Although MB assemblies as discussed have folded dipoles 205, it will be understood that other dipole configurations are possible and within the scope of the disclosure. C-Band radiators 115, CBRS columns 110, and CBRS arrays 120.
[0033] FIG. 5 illustrates a cross section of the directors 315/415, including the thicknesses and materials the PCB substrate 317/417 and conductive plate 325/425.
[0034] FIG. illustrates a set of return loss plots over the MB frequency range. Return loss plot 605 corresponds to MB radiator assembly 105a having conventional director 215; return loss plot 615 corresponds to MB radiator assembly 105b having exemplary director 315; and return loss plot 610 corresponds to MB radiator assembly 105c having exemplary director 415.

Claims

What is claimed is:
1. A multiband antenna, comprising: a plurality of high band radiators; and a plurality of midband radiator assemblies, each of the midband radiator assemblies having a dipole and a director disposed above the dipole, each director having a conductive plate, wherein the conductive plate includes a set of features that prevents electromagnetic coupling with the plurality of high band radiators.
2. The multiband antenna of claim 1, wherein the set of features comprises a plurality of slots disposed in an outer perimeter of the conductive plate.
3. The multiband antenna of claim 1, wherein the set of features comprises a plurality of ring features.
4. The multiband antenna of claim 3, wherein the plurality of ring features comprises: a plurality of first conductive ring features having a first ring stem having a first length; and a plurality of second conductive ring features having a second ring stem having a second length, wherein the second length is greater than the first length.
5. The multiband antenna of claim 3, wherein each of the plurality ring features comprises: an inner conductive ring; and
8 an outer conductive ring, wherein the inner conductive ring is disposed within the outer conductive ring. The multiband antenna of claim 5, wherein the inner conductive ring and the outer conductive ring are concentric.
9
PCT/US2022/077913 2021-10-11 2022-10-11 Frequency selective parasitic director for improved midband performance and reduced c-band/cbrs interference WO2023064774A1 (en)

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US63/254,235 2021-10-11

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150042513A1 (en) * 2013-08-07 2015-02-12 Senglee Foo Broadband Low-Beam-Coupling Dual-Beam Phased Array
US20180323513A1 (en) * 2017-05-03 2018-11-08 Commscope Technologies Llc Multi-band base station antennas having crossed-dipole radiating elements with generally oval or rectangularly shaped dipole arms and/or common mode resonance reduction filters
US20210104813A1 (en) * 2017-01-24 2021-04-08 Commscope Technologies Llc Base station antennas including supplemental arrays
WO2021150365A1 (en) * 2020-01-21 2021-07-29 John Mezzalingua Associates, LLC Multi-band antenna array face and radiator configuration for mitigating interference
US20210305721A1 (en) * 2020-03-26 2021-09-30 Commscope Technologies Llc Cloaked radiating elements having asymmetric dipole radiators and multiband base station antennas including such radiating elements

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150042513A1 (en) * 2013-08-07 2015-02-12 Senglee Foo Broadband Low-Beam-Coupling Dual-Beam Phased Array
US20210104813A1 (en) * 2017-01-24 2021-04-08 Commscope Technologies Llc Base station antennas including supplemental arrays
US20180323513A1 (en) * 2017-05-03 2018-11-08 Commscope Technologies Llc Multi-band base station antennas having crossed-dipole radiating elements with generally oval or rectangularly shaped dipole arms and/or common mode resonance reduction filters
WO2021150365A1 (en) * 2020-01-21 2021-07-29 John Mezzalingua Associates, LLC Multi-band antenna array face and radiator configuration for mitigating interference
US20210305721A1 (en) * 2020-03-26 2021-09-30 Commscope Technologies Llc Cloaked radiating elements having asymmetric dipole radiators and multiband base station antennas including such radiating elements

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