CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to European Application No. 19172157.0, filed May 2, 2019, the entire contents of which are incorporated herein by reference.

TECHNOLOGICAL FIELD

Embodiments of the present invention relate to a multi-band antenna arrangement. Some embodiments of the present disclosure relate to a multi-band antenna arrangement suitable for use in 5G telecommunications.

BACKGROUND

Telecommunication standards specify operational frequency bands. It is therefore desirable for a transceiver to be multi-band and operate in multiple different operational frequency bands.

While, in some examples, it may be possible to use an antenna arrangement that has a single wide operational bandwidth that covers simultaneously multiple different operational frequency bands, this can be undesirable as there can then be insufficient isolation between communications in the different operational frequency bands causing interference.

BRIEF SUMMARY

According to various, but not necessarily all, embodiments there is provided multi-layer antenna arrangement comprising: a first layer comprising a conductive radiating element configured to have multiple overlapping resonant modes that define a first frequency range; a second layer comprising at least a portion of a ground plane for the conductive radiating element; and a third layer, between the first layer and the second layer, comprising a conductive resonator configured to provide a stop band within the first frequency range.

In some but not necessarily all examples, the first, second and third layers are integrated as a single component.

In some but not necessarily all examples, the first frequency range is greater than 24 GHz.

In some but not necessarily all examples, the conductive radiating element is a slotted patch antenna.

In some but not necessarily all examples, a fundamental dipole mode of the slotted patch antenna is responsible for a first resonance mode and two slot modes are responsible for a second and a third resonance mode, wherein a length of the conductive radiating element determines the fundamental dipole mode.

In some but not necessarily all examples, the conductive radiating element comprises stepped straight slots, each slot comprising a thinner straight central section and a wider straight peripheral section.

In some but not necessarily all examples, a total length of each slot determines a second one of the multiple resonant modes.

In some but not necessarily all examples, dimensions of the wider straight peripheral portion determine a third one of the multiple resonant modes.

In some but not necessarily all examples, the resonator, in the third layer, is configured to operate as a reflector for stop band frequencies.

In some but not necessarily all examples, the conductive resonator comprises multiple microstrip resonators, placed under respective slots of the conductive radiating element.

In some but not necessarily all examples, the microstrip resonators are curved.

In some but not necessarily all examples, the multi-layer antenna arrangement comprises a symmetrical crossed slot arrangement in the conductive radiating element.

In some but not necessarily all examples, the second layer is a lifted ground plane to enhance the gain in higher frequency bands and the multi-layer antenna arrangement further comprises a fourth layer, below the second layer comprising a main ground plane for the conductive radiating element.

In some but not necessarily all examples, the multi-layer antenna arrangement is directly connected to amplification circuitry without an intervening bandstop filter component.

According to various, but not necessarily all, embodiments there is provided examples as claimed in the appended claims.

