EP4026199A1 - Système d'antenne - Google Patents

Système d'antenne

Info

Publication number
EP4026199A1
EP4026199A1 EP20729695.5A EP20729695A EP4026199A1 EP 4026199 A1 EP4026199 A1 EP 4026199A1 EP 20729695 A EP20729695 A EP 20729695A EP 4026199 A1 EP4026199 A1 EP 4026199A1
Authority
EP
European Patent Office
Prior art keywords
pcb
antenna
antennas
signal
frequency
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.)
Pending
Application number
EP20729695.5A
Other languages
German (de)
English (en)
Inventor
Vedicherla SREENIVASULU REDDY
Gopireddy SIVA RAMI REDDY
Gupta SAGAR
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Bosch Global Software Technologies Pvt Ltd
Original Assignee
Robert Bosch GmbH
Robert Bosch Engineering and Business Solutions Pvt Ltd
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 Robert Bosch GmbH, Robert Bosch Engineering and Business Solutions Pvt Ltd filed Critical Robert Bosch GmbH
Publication of EP4026199A1 publication Critical patent/EP4026199A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • 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
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
    • 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
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
    • 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
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • 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

Definitions

  • This invention is related to an antenna system.
  • the internal antennas not only provides a design configuration to overcome the difficulties and also limitations of the external antennas mentioned above, it further enhances the portability of the communication systems since the antennas can be conveniently placed as a standalone system without special radio frequency cables.
  • a prior art document US5604506 discloses a dual frequency vertical antenna.
  • a dual frequency vertical antenna for radiating a first and a second airwave signal in response to a first and a second conducted signal, the first airwave signal having a first frequency and the second airwave signal having a second frequency lower than one-half the first frequency.
  • the antenna includes a horizontal base member and a vertical mast, including a coaxially disposed rod, projecting upward from the base member to a masthead.
  • Figures 1(a), 1(b) illustrates an antenna system, in accordance with an embodiment of an invention
  • Figures 2 (a), 2(b) illustrates the antenna system, according to an embodiment of the invention
  • Figure 3 illustrates an impedance matching network of the antenna system, according to an embodiment of the invention
  • Figure 4 illustrates a graph comprising multiple reflection coefficient values mapped to multiple frequency values, according to an embodiment of the invention
  • Figure 5 illustrates a graph comprising multiple efficiency values mapped to multiple frequency values, according to an embodiment of the invention.
  • FIG. 1 illustrates an antenna system, in accordance with an embodiment of the invention.
  • the antenna system 10 comprises a first printed circuit board (PCB) 12 and a second printed circuit board (PCB) 14 positioned perpendicular to the first PCB 12, at one end of the first PCB 12.
  • the second PCB 14 has dimensions that is different from the first PCB 12.
  • the first PCB 12 is made larger than the second PCB 14.
  • the first PCB 12 comprises a cut-portion to receive a corresponding cut-portion made on the second PCB 14, such that, the second PCB 14 is fitted vertically on the first PCB 12.
  • a feeding pad 16 is placed in between of the first PCB 12 and the second PCB 14, where the second PCB 14 is fitted on the first PCB 12, to receive or radiate at least one signal.
  • the first PCB 12 comprises multiple layers and the second PCB 14 is fitted on the top layer of the first PCB 12.
  • FIG. 2 (a), 2(b) illustrates the antenna system, according to an embodiment of the invention the second PCB 14 comprises a first antenna 20 and a second antenna 22 fixed on each side of the second PCB 14.
  • the first and the second antennas (20, 22) comprises a common feeding pin 18.
  • the feeding pin 18 is in connection with the feeding pad 16 to receive and radiate the signals.
  • the first antenna 20 is a bent- monopole strip antenna and the second antenna 22 is a micro-strip coupled slot or aperture antenna.
  • the first antenna 20 comprises two elliptical structures or any combination of the basic shapes comprising smooth transition from one point to other point, positioned in front of each other and connected at the ends, to form the bent-monopole strip antenna.
  • the second antenna 22 which is in the form of a slot structure, can take any of the basic shapes comprising rectangular, circular, elliptical etc. or combination of them to have a better efficiency.
  • the first and second antennas (20, 22) are made of a printed circuit board technology.
  • the metal element is chosen from a group of metals, which are electrically good conductors like steel, copper, aluminum, silver etc.
  • the first and second antennas (20, 22) are used to resonate at a frequency band like 850MHz and 2.4 GHz.
  • the space constraint on the second PCB 14 to mount the first and second antennas (20, 22) is solved by the above-disclosed design, as it is compact to fit even in smaller places when compared to the conventional polygonal shaped antenna.
  • the width and the height of the first and second antennas (20, 22) are maintained at a predefined level, such that, the efficiency of the both antennas (20, 22) is not reduced.
  • the feeding pin 18 that is common for both first and the second antennas (20, 22) of the second PCB 14 receives at least one signal or radiates the same.
  • the length of the feeding pin 18 that is connected to the second antenna 22 is shorter than the length of the feeding pin 18 that is connected to first antenna 20.
  • Both the antennas (first and second) (20, 22) are not shorted to the ground as known to a person skilled in the art Bent monopole antenna uses the first PCB ground plane to increase the antenna performance.
  • a distance between a feeding pin 18 and at least one shorting/ground pin is maintained at a predefined value during the manufacturing of the antennas (20, 22) to optimize an input impedance and a bandwidth of the radio frequency signal.
  • the resonating frequencies of the antenna system 10 are chosen at two frequencies over a broader frequency range.
  • the first and second antennas (20, 22) will operate in two resonant modes (For example, at 850MHz and 2500MHz). These resonance frequencies are realizable at the feeding pin 18, such that, the first and second antennas (20, 22) are operated efficiently over the broader frequency range, ex. from 699MHz to 960MHz & 1700MHz to 2700MHz.
  • the location of the feeding pin 18 on the first and second antennas (20, 22) is optimized to get the optimal radiation performance.
  • FIG. 1 illustrates an impedance matching network 25 of the second antenna
  • the second antenna 22 of the second PCB 14 has an impedance matching network 25 adapted to radiate at least one signal in the frequency band of interest
  • the impedance matching network 25 comprises multiple lumped components like capacitors 24 and inductors 26 as shown in the fig 3.
  • the impedance matching network 25 comprises at least one inductors 26 and at least one capacitors 24 connected in parallel to each other.
  • One end of the network 25 is connected to the feeding pin 18 and the other end to the second antenna 22.
  • the above-disclosed connection is used to improve the radiation efficiency.
  • the radio frequency energy is reflected at the feeding pin 18 depending on the mode of operation.
  • the above disclosed antenna system efficiency and bandwidth is obtained using the first antenna and the second antenna in the respective lower and higher frequency ranges (699MHz to 960MHz, 1700MHz to 2700MHz).
  • the antenna system 10 having two antennas (20, 22) mounted on either side of the second PCB 22 works in a broader range of frequency.
  • the signal With the common feeding, pin 18 connecting the first and second antennas (20, 22), the signal can be transmitted from one side of the second PCB 14 to the other side.
  • the first antenna 20 receives the signals and radiates major portion of energy with the help of impedance matching network 25 present and also reactively loading of second antenna 22.
  • the signal received is higher in the frequency, then the signal is transmitted to the second antenna 22 and the first antenna together radiates the received higher frequency signal.
  • Figure 4 illustrates a graph comprising multiple frequency values mapped to multiple bandwidth values of the antenna in x-axis and y-axis respectively, according to an embodiment of the invention.
  • the antenna bandwidth is defined as the input reflection coefficient (i.e., the amount of power reflected back from the feeding pin) and is maintained less than -6dB in lower band and less than -lOdB in upper band frequency.
  • FIG. 5 illustrates a graph comprising multiple efficiency values mapped to multiple frequency values in y-axis and x-axis respectively, according to an embodiment of the invention.
  • the total antenna efficiency over the frequency range of interest for mobile communication systems i.e., 699 MHz to 960 MHz, and 1700MHz to 2700 MHZ
  • the system efficiency has been achieved more than 70% in the lower frequency band (ie.,699MHz to 960MHz) and more than 80% in the higher frequency band ( ie, 1700MHz to 2700MHz). Due to the two resonant structures of the first and second antennas (20, 22) along with the antenna impedance matching network 25, the desired efficiency of the antenna system 10 can be achieved.

Landscapes

  • Waveguide Aerials (AREA)

Abstract

Le système d'antenne (10) comprend une première carte de circuit imprimé (PCB) (12) et une seconde carte de circuit imprimé (PCB) (14) positionnée perpendiculairement à la première PCB (12), à une extrémité de la première PCB (12). La seconde PCB (14) a des dimensions différentes de celles de la première PCB. La première et la seconde PCB (12, 14) ont une broche d'alimentation commune (18).
EP20729695.5A 2019-06-26 2020-05-28 Système d'antenne Pending EP4026199A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201941025334 2019-06-26
PCT/EP2020/064834 WO2020259945A1 (fr) 2019-06-26 2020-05-28 Système d'antenne

Publications (1)

Publication Number Publication Date
EP4026199A1 true EP4026199A1 (fr) 2022-07-13

Family

ID=70922030

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20729695.5A Pending EP4026199A1 (fr) 2019-06-26 2020-05-28 Système d'antenne

Country Status (2)

Country Link
EP (1) EP4026199A1 (fr)
WO (1) WO2020259945A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5604506A (en) 1994-12-13 1997-02-18 Trimble Navigation Limited Dual frequency vertical antenna
US6404394B1 (en) * 1999-12-23 2002-06-11 Tyco Electronics Logistics Ag Dual polarization slot antenna assembly
US8810457B2 (en) * 2011-06-24 2014-08-19 Taoglas Group Holdings Orthogonal modular embedded antenna, with method of manufacture and kits therefor

Also Published As

Publication number Publication date
WO2020259945A1 (fr) 2020-12-30

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