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US-12627076-B2 - Mobile communication antenna

US12627076B2US 12627076 B2US12627076 B2US 12627076B2US-12627076-B2

Abstract

A mobile communication antenna comprises a reflector arrangement and a plurality of dual-polarized radiators, which are arranged in at least m columns on the reflector arrangement, with m≥2. The plurality of dual-polarized radiators comprises multiple dual-polarized TX radiators and multiple dual-polarized RX radiators. Each of the multiple dual-polarized TX radiators comprises a signal connector arrangement, wherein the respective signal connector arrangement is connected only to a transmitter arrangement for communicating a mobile communication signal. Each of the multiple dual-polarized RX radiators comprises a signal connector arrangement, wherein the respective signal connector arrangement is connected only to a receiver arrangement for communicating a mobile communication signal. The multiple dual-polarized TX radiators are arranged in at least two columns and the multiple dual-polarized RX radiators are arranged in at least two columns.

Inventors

  • Maximilian Göttl

Assignees

  • TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

Dates

Publication Date
20260512
Application Date
20200924

Claims (12)

  1. 1 . A mobile communication antenna comprising the following features: a reflector arrangement is provided; a plurality of dual-polarized radiators are provided, which are arranged in at least m columns on a first side of the reflector arrangement, with m≥2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 64, 128; the plurality of dual-polarized radiators comprises multiple dual-polarized TX radiators and multiple dual-polarized RX radiators; each of the multiple dual-polarized TX radiators comprises a signal connector arrangement, wherein the respective signal connector arrangement is connected only to a transmitter arrangement for communicating a mobile communication signal; each of the multiple dual-polarized RX radiators comprises a signal connector arrangement, wherein the respective signal connector arrangement is connected only to a receiver arrangement for communicating a mobile communication signal; the multiple dual-polarized TX radiators are arranged in at least two columns of the m columns and the multiple dual-polarized RX radiators are arranged in at least two columns of the m columns; and the multiple dual-polarized TX radiators are configured to transmit mobile communication signals in two polarizations of a first polarization type and the multiple dual-polarized RX radiators are configured to receive mobile communication signals in two polarizations of a second polarization type, wherein the first and second polarization types are different, and wherein the multiple dual-polarized TX radiators are of a different radiator type than the multiple dual-polarized RX radiators, wherein the multiple dual-polarized TX radiators are dipoles and the multiple dual-polarized RX radiators are patches, or wherein the multiple dual-polarized TX radiators are patches and the multiple dual-polarized TX radiators are dipoles.
  2. 2 . The mobile communication antenna according to claim 1 , characterized by the following feature: at least two dual-polarized TX radiators in the same column of the m columns, a distance between two dual-polarized TX radiators in the same column is: larger than 0.25Λ, 0.3Λ, 0.35Λ, 0.4Λ, 0.45Λ, 0.5Λ, 0.55Λ, 0.60Λ or larger than 0.65Λ, where Λ is a wavelength of a mid-frequency of the dual-polarized TX radiators; and/or smaller than 0.7Λ, 0.65Λ, 0.60Λ, 0.55Λ, 0.50Λ, 0.45Λ, 0.40Λ or smaller than 0.35Λ; and/or at least two dual-polarized RX radiators in the same column of the m columns, a distance between two dual-polarized RX radiators in the same column is: larger than 0.25Λ, 0.3Λ, 0.35Λ, 0.4Λ, 0.45Λ, 0.5Λ, 0.55Λ, 0.60Λ or larger than 0.65Λ, where Λ is a wavelength of a mid-frequency of the dual polarized RX radiators; and/or smaller than 0.7Λ, 0.65Λ, 0.60Λ, 0.55Λ, 0.50Λ, 0.45Λ, 0.40Λ or smaller than 0.35Λ.
  3. 3 . The mobile communication antenna according to claim 1 , characterized by the following features: a signal processing device is provided; the multiple dual-polarized TX radiators are connected to the signal processing device via the transmitter arrangement; the multiple dual-polarized RX radiators are connected to the signal processing device via the receiver arrangement.
  4. 4 . The mobile communication antenna according to claim 3 , characterized by the following features: the transmitter arrangement comprises a filter device with one or more transmitting filters; the receiver arrangement comprises a filter device with one or more receiving filters; the receiving filter or receiving filters in the receiver arrangement are of a different filter type than the transmitting filter or transmitting filters in the transmitter arrangement.
  5. 5 . The mobile communication antenna according to claim 4 , characterized by the following features: the transmitter arrangement comprises a transmission signal path for each polarization of each: dual-polarized TX radiator; and/or group of interconnected dual-polarized TX radiators; wherein at least one transmitting filter with several filter circuits is arranged in each transmission signal path; the receiver arrangement comprises a receiving signal path for each polarization of each: dual-polarized RX radiator; and/or group of interconnected dual-polarized RX radiators; wherein at least one receiving filter with several filter circuits is arranged in each receiving signal path; the at least one receiving filter in the respective receiving signal path has smaller spatial dimensions than the at least one transmitting filter in the respective transmission signal path.
  6. 6 . The mobile communication antenna according to claim 3 , characterized by the following features: the transmitter arrangement comprises a transmission signal path for each polarization of: each dual-polarized TX radiator; and each group of interconnected dual-polarized TX radiators; wherein at least one power amplifier is arranged in each transmission signal path; the power amplifier connected to a group of interconnected dual-polarized TX radiators is stronger in power than the power amplifier connected to a single dual-polarized TX radiator.
  7. 7 . The mobile communication antenna according to claim 3 , characterized by the following features: the signal processing device is configured to generate: individual transmission signals for each dual-polarized TX radiator; and/or group-based transmission signals for a group of interconnected dual-polarized TX radiators; wherein the transmitter arrangement is configured to transmit the: individual transmission signals to the corresponding dual-polarized TX radiator; and/or group-based transmission signals to the corresponding group of interconnected dual-polarized TX radiators; and/or the receiver arrangement is configured to receive: individual receiving signals from the dual-polarized RX radiators and transmit them to the signal processing device; and/or group-based receiving signals from a group of interconnected dual-polarized RX radiators and transmit them to the signal processing device.
  8. 8 . The mobile communication antenna according to claim 1 , characterized by the following feature: each of the m columns comprises multiple dual-polarized TX radiators as well as multiple dual-polarized RX radiators, which are arranged alternatingly in each column.
  9. 9 . The mobile communication antenna according to claim 8 , characterized by the following feature: in each of the m columns, the multiple dual-polarized TX radiators as well as the multiple dual-polarized RX radiators are arranged at the same position, whereby the m columns are identically constructed to each other; or the multiple dual-polarized TX radiators are arranged in at least one odd-numbered column or in multiple odd-numbered columns at the same positions where the multiple dual-polarized RX radiators are arranged in at least one even-numbered column or in multiple even-numbered columns; and the multiple dual-polarized RX radiators are arranged in at least one odd-numbered column or in multiple odd-numbered columns at the same positions where the multiple dual-polarized TX radiators are arranged in at least one even-numbered column or in multiple even-numbered columns.
  10. 10 . The mobile communication antenna according to claim 1 , characterized by the following feature: m is at least ≥4; the multiple dual-polarized TX radiators are arranged predominantly or exclusively in odd-numbered columns and the multiple dual-polarized RX radiators are arranged predominantly or exclusively in even-numbered columns; or the multiple dual-polarized TX radiators are arranged predominantly or exclusively in even-numbered columns and the multiple dual-polarized RX radiators are arranged predominantly or exclusively in odd-numbered columns.
  11. 11 . The mobile communication antenna according to claim 1 , further characterized by the following feature: either: the first polarization type is a ±45° polarization and the second polarization type is a horizontal/vertical polarization; or the first polarization type is a horizontal/vertical polarization and the second polarization type is a ±45° polarization.
  12. 12 . The mobile communication antenna according to claim 11 , further characterized by the following feature: at least two dual-polarized TX radiators in the same column of the m columns, a distance between two dual-polarized TX radiators in the same column is: larger than 0.25Λ, 0.3Λ, 0.35Λ, 0.4Λ, 0.45Λ, 0.5Λ, 0.55Λ, 0.60Λ or larger than 0.65Λ, where Λ is a wavelength of a mid-frequency of the dual-polarized TX radiators or dual polarized RX radiators; and/or smaller than 0.7Λ, 0.65Λ, 0.60Λ, 0.55Λ, 0.50Λ, 0.45Λ, 0.40Λ or smaller than 0.35Λ; and/or at least two dual-polarized RX radiators in the same column of the m columns, a distance between two dual-polarized RX radiators in the same column is: larger than 0.25Λ, 0.3Λ, 0.35Λ, 0.4Λ, 0.45Λ, 0.5Λ, 0.55Λ, 0.60Λ or larger than 0.65Λ, where Λ is a wavelength of a mid-frequency of the dual polarized RX radiators; and/or smaller than 0.7Λ, 0.65Λ, 0.60Λ, 0.55Λ, 0.50Λ, 0.45Λ, 0.40Λ or smaller than 0.35Λ.

Description

This application is a 35 U.S.C. § 371 national phase filing of International Application No. PCT/EP2020/076686, filed Sep. 24, 2020, the disclosure of which is incorporated herein by reference in its entirety. TECHNICAL FIELD The invention relates to a mobile communication antenna which is used to transmit and receive mobile communication signals, for example from cell phones. BACKGROUND Mobile communication antennas are used to establish a communication to cell phones. Those mobile communication antennas are normally mounted on roofs or shafts for example. Depending on the number of mobile communication bands and the coverage, the dimensions of the needed mobile communication antennas could be quite large. This may result in critical wind load conditions and in higher rents for the operator. U.S. Pat. No. 7,808,443 B2 describes a mobile communication antenna. The mobile communication antenna has the plurality of radiators arranged in one column. The signals, which comprise transmission signals and receiving signals (TX/RX) of half of the radiators are filtered using a low-pass filter and the signals of the other half of the radiators, which also comprise transmission signals and receiving signals (TX/RX) are filtered using a high pass. Those filters and therefore the antenna have quite large dimensions. As such, it would be desirable to have a mobile communication antenna with reduced weight and with reduced dimensions without decreasing electrical properties. SUMMARY An object of the present invention is seen in building a compact mobile communication antenna, wherein the electrical parameters are reproducible. The object is solved by a mobile communication antenna according to claim 1. Claims 2 to 12 describe further embodiments of the mobile communication antenna. The mobile communication antenna comprises a reflector arrangement. The reflector arrangement could be made of a single metal piece (for example a metal sheet) or of a plurality of metal pieces. Furthermore, the reflector arrangement could also be made of at least one printed circuit board comprising a metal layer or of coated dielectric(s). In addition, a plurality of dual-polarized radiators is provided. They are arranged in at least m columns on the first side of the reflector arrangement, with m≥2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16; 32, 64, 128. The plurality of dual-polarized radiators comprises multiple dual-polarized TX radiators (TX=Transmitter) and multiple dual-polarized RX radiators (RX=Receiver). Preferably, there are as many dual-polarized TX radiators as there are dual-polarized RX radiators. Each of the multiple dual-polarized TX radiators comprises a signal connector arrangement. The respective signal connector arrangement is only connected to the transmitter arrangement for communicating of the mobile communication signal. The wording “signal connector arrangement” has to be understood in such a way that the mobile communication signal is fed to this connector. The signal line of this connector is therefore preferably not connected to ground. The signal connector arrangement of the multiple dual-polarized TX radiators is therefore connected at some stage to a at least one power amplifier, wherein this at least one power amplifier is only used to amplify mobile communication signals that are intended to be transmitted from the mobile communication antenna and which are intended to be sent to the cell phones for example. Furthermore, each of the multiple dual-polarized RX radiators also comprises a signal connector arrangement. The signal connector arrangement is thereby only used to communicate the received mobile communication signals. The signal line of this connector is preferably not connected to ground. The signal connector arrangement of the multiple dual-polarized RX radiators is therefore connected at some stage to at least one low noise amplifier, wherein this at least one low noise amplifier is only used to amplify mobile communication signals that are received from the cell phones for example via the multiple dual-polarized RX radiators. In other words, a signal processing device (for example the radio) only receives receiving signals (for example from the cell phones) from the multiple dual-polarized RX radiators. The signal processing device (for example the radio) only transmits transmitting signals (for example to the cell phones) to the multiple dual-polarized TX radiators. The multiple dual-polarized TX radiators are only used to transmit a mobile communication signal (transmitting signal) for example to mobile devices, wherein the multiple dual-polarized RX radiators are only used to receive a mobile communication signal for example from mobile devices. As a result, the isolation between the multiple dual-polarized TX radiators and the multiple dual-polarized RX radiators is increased up to 10 dB to 15 dB. As such the passive intermodulation (PIM) between transmitting signals and receiving signal