Dual mode cloaking base station antenna system using frequency selective surfaces
A multi-band antenna may include a first antenna array for operation in a first frequency range and a second antenna array for operation in a second frequency range that is higher than the first frequency range. The first antenna array may include at least one antenna element having a plurality of components, where at least one of the plurality of components is constructed with a frequency selective surface (FSS) comprising a plurality of FSS elements. The FSS may be configured for the at least one of the plurality of components to provide a rejection of a coupling of energy from the second frequency range, and for the at least one of the plurality of components to provide a transmission of signals in the first frequency range suitable for use in a cellular communication system.
1 . A multi-band antenna comprising:
a first antenna array for operation in a first frequency range; and
a second antenna array for operation in a second frequency range, wherein the second frequency range is higher than the first frequency range;
wherein the first antenna array comprises at least one antenna element, wherein the at least one antenna element comprises a plurality of components, wherein at least one of the plurality of components is constructed with a frequency selective surface (FSS) comprising a plurality of FSS elements;
wherein the FSS is configured for the at least one of the plurality of components to provide a rejection of a coupling of energy from the second frequency range, and for the at least one of the plurality of components to provide a transmission of signals in the first frequency range suitable for use in a cellular communication system;
wherein at least a first subset of the plurality of FSS elements comprises complete FSS elements, wherein each of the complete FSS elements comprises a slotted aperture etched into a conductive surface around a perimeter of the complete FSS element, and where the slotted aperture forms an incomplete hexagon shape or an incomplete ring shape, with a total internal perimeter of the slotted aperture being a wavelength of a resonance wavelength in a third frequency range.
2 . The multi-band antenna of claim 1 , wherein the rejection of the coupling of the energy from the second frequency range comprises a loss of at least 20 dB.
3 . The multi-band antenna of claim 1 , wherein the transmission of the signals in the first frequency range suitable for use in the cellular communication system comprises a loss of no more than 3 dB.
4 . The multi-band antenna of claim 1 , where the plurality of FSS elements is tessellated into an array, wherein the array comprises the at least the first subset of the plurality of FSS elements and at least a second subset of the plurality of FSS elements, and wherein the at least the second subset of the plurality of FSS elements comprises truncated FSS elements to conform to a shape of the at least one of the plurality of components.
5 . The multi-band antenna of claim 1 , wherein the plurality of components comprises at least one component for radiating radio frequency (RF) energy.
6 . The multi-band antenna of claim 1 , wherein the first antenna array comprises a plurality of antenna elements, the plurality of antenna elements including the at least one antenna element.
7 . The multi-band antenna of claim 1 , further comprising:
a third antenna array for operation in the third frequency range, wherein the third frequency range is higher than the second frequency range; and
wherein the FSS is further configured for the at least one of the plurality of components to provide the resonance wavelength in the third frequency range.
8 . A multi-band antenna comprising:
a first antenna array for operation in a first frequency range; and
a second antenna array for operation in a second frequency range, wherein the second frequency range is higher than the first frequency range;
wherein the first antenna array comprises at least one antenna element, wherein the at least one antenna element comprises a plurality of components, wherein at least one of the plurality of components is constructed with a frequency selective surface (FSS) comprising a plurality of FSS elements, wherein the plurality of components comprises at least one component for radiating radio frequency (RF) energy, wherein the plurality of components further comprises a balun feed network ground plane; and
wherein the FSS is configured for the at least one of the plurality of components to provide a rejection of a coupling of energy from the second frequency range, and for the at least one of the plurality of components to provide a transmission of signals in the first frequency range suitable for use in a cellular communication system.
9 . The multi-band antenna of claim 8 , wherein the at least one of the plurality of components that is constructed with the FSS comprises at least one of:
the at least one component for radiating RF energy; or
the balun feed network ground plane.
10 . The multi-band antenna of claim 8 , wherein the rejection of the coupling of the energy from the second frequency range comprises a loss of at least 20 dB.
11 . The multi-band antenna of claim 8 , wherein the transmission of the signals in the first frequency range suitable for use in the cellular communication system comprises a loss of no more than 3 dB.
12 . The multi-band antenna of claim 8 , wherein the first antenna array comprises a plurality of antenna elements, the plurality of antenna elements including the at least one antenna element.
13 . A multi-band antenna comprising:
a first antenna array for operation in a first frequency range; and
a second antenna array for operation in a second frequency range, wherein the second frequency range is higher than the first frequency range;
wherein the first antenna array comprises at least one antenna element, wherein the at least one antenna element comprises a plurality of components, wherein at least one of the plurality of components is constructed with a frequency selective surface (FSS) comprising a plurality of FSS elements;
wherein the plurality of FSS elements have features configured for the at least one of the plurality of components to provide a resonance wavelength in the second frequency range, and for the at least one of the plurality of components to provide a transmission of signals in the first frequency range suitable for use in a cellular communication system;
wherein at least a first subset of the plurality of FSS elements comprises complete FSS elements, wherein each of the complete FSS elements comprises a slotted aperture etched into a conductive surface around a perimeter of the complete FSS element, and where the slotted aperture forms an incomplete hexagon shape or an incomplete ring shape, with a total internal perimeter of the slotted aperture being a wavelength of the resonance wavelength.
14 . The multi-band antenna of claim 13 , wherein the transmission of the signals in the first frequency range suitable for use in the cellular communication system comprises a loss of no more than 3 dB.
15 . The multi-band antenna of claim 13 , where the plurality of FSS elements is tessellated into an array, wherein the array comprises the at least the first subset of the plurality of FSS elements and at least a second subset of the plurality of FSS elements, and wherein the at least the second subset of the plurality of FSS elements comprises truncated FSS elements to conform to a shape of the at least one of the plurality of components.
16 . The multi-band antenna of claim 13 , wherein the plurality of components comprises at least one component for radiating radio frequency (RF) energy.
17 . The multi-band antenna of claim 13 , wherein the first antenna array comprises a plurality of antenna elements, the plurality of antenna elements including the at least one antenna element.
18 . The multi-band antenna of claim 13 , further comprising:
a third antenna array for operation in a third frequency range, wherein the third frequency range is between the first frequency range and the second frequency range; and
wherein the features of the plurality of FSS elements are further configured for the at least one of the plurality of components to provide a rejection of a coupling of energy from the third frequency range.
19 . The multi-band antenna of claim 18 , wherein the rejection of the coupling of the energy from the third frequency range comprises a loss of at least 20 dB.
20 . A multi-band antenna comprising:
a first antenna array for operation in a first frequency range; and
a second antenna array for operation in a second frequency range, wherein the second frequency range is higher than the first frequency range;
wherein the first antenna array comprises at least one antenna element, wherein the at least one antenna element comprises a plurality of components, wherein at least one of the plurality of components is constructed with a frequency selective surface (FSS) comprising a plurality of FSS elements, wherein the plurality of components comprises at least one component for radiating radio frequency (RF) energy, wherein the plurality of components further comprises a balun feed network ground plane;
wherein the plurality of FSS elements have features configured for the at least one of the plurality of components to provide a resonance wavelength in the second frequency range, and for the at least one of the plurality of components to provide a transmission of signals in the first frequency range suitable for use in a cellular communication system.
21 . The multi-band antenna of claim 20 , wherein the at least one of the plurality of components that is constructed with the FSS comprises at least one of:
the at least one component for radiating RF energy; or
the balun feed network ground plane.
22 . The multi-band antenna of claim 20 , wherein the transmission of the signals in the first frequency range suitable for use in the cellular communication system comprises a loss of no more than 3 dB.
23 . The multi-band antenna of claim 20 , wherein the first antenna array comprises a plurality of antenna elements, the plurality of antenna elements including the at least one antenna element.