Multi-band antenna arrangement
A multi-layer antenna arrangement is provided that includes a first layer having a conductive radiating element configured to have multiple overlapping resonant modes that define a first frequency range. The multi-layer antenna arrangement also includes a second layer having at least a portion of a ground plane for the conductive radiating element. The multi-layer antenna arrangement additionally includes a third layer, between the first layer and the second layer, that has a conductive resonator configured to provide a stop band within the first frequency range.
1. A 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.
2. A multi-layer antenna arrangement as claimed in claim 1 , wherein the first, second and third layers are integrated as a single component.
3. A multi-layer antenna arrangement as claimed in claim 1 , wherein the first frequency range is greater than 24 GHz.
4. A multi-layer antenna arrangement as claimed in claim 1 , wherein the conductive radiating element is a slotted patch antenna.
5. A multi-layer antenna arrangement as claimed in claim 4 , wherein 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, and wherein a length of the conductive radiating element determines the fundamental dipole mode.
6. A multi-layer antenna arrangement as claimed in claim 4 , wherein the conductive radiating element comprises stepped straight slots, each slot comprising a thinner straight central section and a wider straight peripheral section.
7. A multi-layer antenna arrangement as claimed in claim 6 , wherein a total length of each slot determines a second one of the multiple resonant modes.
8. A multi-layer antenna arrangement as claimed in claim 6 , wherein dimensions of the wider straight peripheral portion determine a third one of the multiple resonant modes.
9. A multi-layer antenna arrangement as claimed in claim 1 , wherein the resonator, in the third layer, is configured to operate as a reflector for stop band frequencies.
10. A multi-layer antenna arrangement as claimed in claim 1 , wherein the conductive resonator comprises multiple microstrip resonators, placed under respective slots of the conductive radiating element.
11. A multi-layer antenna arrangement as claimed in claim 10 , wherein the microstrip resonators are curved.
12. A multi-layer antenna arrangement as claimed in claim 1 , comprising a symmetrical crossed slot arrangement in the conductive radiating element.
13. A multi-layer antenna arrangement as claimed in claim 1 , wherein 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.
14. A transceiver system comprising the multi-layer antenna arrangement as claimed in claim 1 .
15. A transceiver system as claimed in claim 14 , wherein the multi-layer antenna arrangement is directly connected to amplification circuitry without an intervening bandstop filter component.
16. A base station or a mobile station comprising the multi-layer antenna arrangement as claimed in claim 1 .