A reconfigurable resonator apparatus

Abstract

A reconfigurable resonator apparatus 100 comprises a control module 106 coupled to a first resonator 102 and a second resonator 104 disposed next to the first resonator to define a distance 108 betwee

Description

FIELD OF THE INVENTION The invention relates to a reconfigurable resonator apparatus. BACKGROUND TO THE INVENTION Resonance is a phenomenon that occurs when an object or system is subjected to an external force or vibration that matches its natural frequency. When this happens, the object or system absorbs energy from the external force and starts vibrating with a larger amplitude. The spectral line shape of a typical resonator is originally explained by a symmetrical Lorentzian function, which is considered to be the default spectral profile for all kinds of resonances. An unexpected asymmetric line shape in resonant scattering systems was observed in quantum mechanics in 1961. This unconventional characteristic was described as a quantum interference of a discrete state with a continuum state leading to an asymmetric spectral profile and was termed Fano resonance. Electromagnetically induced transparency (EIT) is a special case of Fano resonance and is a coherent optical nonlinearity which renders a medium transparent within a narrow spectral range around an absorption line. It is in essence a quantum interference effect that permits the propagation of light through an otherwise opaque atomic medium. Resonance can occur in various systems, such as mechanical, electrical, or acoustic systems, and it is often desirable in certain applications, such as musical instruments or radio receivers. For example, US patent no.: US10186743B2 discloses a microstrip circuits exhibiting electromagnetically induced transparency and Fano resonance. This includes a microstrip transmission line and at least two identical parallel quarter-wavelength open stubs extending from the transmission line in close proximity so that mutual coupling between the electromagnetic fields at adjacent ends of the stubs induces Faro resonances and electromagnetically induced transparency (EIT). The circuits may be used for microwave buffers, or when a variable capacitance, such as a varactor, is inserted between the open ends of the stubs, the circuits may be used for active transmission phase control. US11391624B2 discloses a light sensor which includes a first pixel and a second pixel. Each pixel has a photoconversion area. A band-stop Fano resonance filter is arranged over the first pixel. The second pixel includes no Fano resonance filter. Signals output from the first and second pixels are processed to determine information representative of the quantity of light received by the light sensor during an illumination phase in a rejection band of the band-stop Fano resonance filter. Although prior art discloses the application of Fano resonances for optical and plasmonic sensors, Lorentzian resonances for microwave cavities, and EIT in atomic systems for quantum memory, there is a need to integrate these resonances into one system. The preceding discussion of the background to the invention is intended only to facilitate an understanding of the present invention. It should be appreciated that the discussion is not an acknowledgment or admission that any of the material referred to was part of the common general knowledge in the art as at the priority date of the application. SUMMARY OF THE INVENTION In accordance with an aspect of the invention there is provided a reconfigurable resonator apparatus comprising: a control module coupled to a first resonator and a second resonator disposed next to the first resonator to define a distance between the resonators, wherein each resonator has a controllable element embedded therein for controlling a resonant frequency of that resonator, and wherein the control module is configured to control one or both of: coupling between the resonators and the resonant frequency of each resonator to control constructive or destructive interferences between the resonators and thereby to control a resonance profile thereof. The control module may be configured to control coupling by varying the distance between the resonators. The first resonator may be mounted on a platform which is moveable relative to the second resonator, and varying the distance may include controlling an actuator to move the platform and thus the first resonator relative to the second resonator. The control module may be configured to control the resonant frequency of each resonator by controlling the controllable element. The controllable element may be a variable capacitor and controlling the controllable element may include varying a distance between conductive plates of the capacitor. The control module may be configured: to control to the controllable element of each resonator to synchronize the resonant frequency of each resonator; and to minimize coupling between the resonators to produce a localised Lorentzian resonance profile. The control module may be configured: to control to the controllable element of each resonator to detune the resonant frequency of each resonator; and to enable coupling between the resonators to produce a Fano resonance profile. The control module may be configured: to control to the controllable element of each resonator to largely detune the resonant frequency of each resonator; and to decouple the resonators to enable interaction between distinct resonance modes to produce an Electromagnetically Induced Transparency (EIT) response profile. Controlling coupling between the resonators and the controllable elements may dynamically switch between Fano resonance, Lorentzian resonance and EIT resonance profiles. The first resonator may have a first quality factor and the second resonator may have a second quality factor, wherein the first quality factor may be different from the second quality factor, and wherein the first quality factor may be lower than the second quality factor. The reconfigurable resonator apparatus may be provided in an unmanned aerial vehicle (UAV) to provide control over the scattering signature of the UAV. The reconfigurable resonator apparatus may be connected to a transceiver for transmitting and receiving signals and the signals may be communication signals. The control module may control constructive or destructive interferences between the resonators in response to receiving an indication of a jamming attack. The control module may control constructive or destructive interferences between the resonators to produce an EIT resonance or Fano resonance profile in response to receiving the indication of the jamming attack. The control module may control constructive or destructive interferences between the resonators to produce a Lorentzian resonance profile in response to receiving an indication of no jamming attack. In accordance with another aspect of the invention there is provided a vehicle comprising the reconfigurable resonator apparatus described above, wherein the vehicle may be an unmanned ariel vehicle. Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS In the drawings: Figure 1 is a schematic diagram which illustrates an exemplary embodiment of a resonator apparatus according to aspects of the present disclosure; Figures 2A and 2B are schematic diagrams which illustrate an exemplary resonator and a plot which illustrates a frequency response of the resonator; Figures 3A and 3B are schematic diagrams which illustrate an exemplary resonator having a tunable capacitor embedded therein and a plot which illustrates a frequency response due to a change in capacitance of the resonator; Figures 4A and 4B are schematic diagrams which illustrate two exemplary resonators and a plot which illustrates a frequency response due to mutual coupling between the resonators; and Figure 5 is a plot which illustrates a frequency response of the exemplary embodiment of Figure 1. DETAILED DESCRIPTION WITH REFERENCE TO THE DRAWINGS A reconfigurable resonator apparatus is provided. The resonator apparatus may include a first resonator and a second resonator disposed next to the first resonator to define a distance between the resonators. The resonator apparatus may include a control module coupled to the first and second resonators (or components thereof). Each resonator may have a controllable element embedded therein. Each control element may be coupled to and controllable by the control module. Each control element may be configured for controlling a resonant frequency of the resonator in which it is embedded. The control module may be configured to control one or both of coupling between the resonators and the resonant frequency of each resonator to control constructive or destructive interferences between the resonators. Controlling coupling between the resonators and the controllable elements may dynamically switch between Fano, Lorentzian, and Electromagnetically Induced Transparency resonance profiles of the resonator apparatus. Figure 1 illustrates an exemplary embodiment of a reconfigurable resonator apparatus (100). The resonator apparatus includes a first resonator (102), a second resonator (104) disposed next to the first resonator (102) and a control module (106) coupled to the first resonator (102) and the second resonator (104). The first resonator (102) may have a first quality factor Q1, and the second resonator (104) may have a second quality factor Q2. The first quality factor Q1 may be lower than the second quality factor Q2. The first resonator (102) may be mounted on a platform (not shown) which is moveable relative to the second resonator (104). An actuator (not shown) may be provided to move the platform and thus the first resonator (102) relative to the second resonator (104). The control module (106) may be configured to control coupling between the first resonator (102) and the second resonator (104) by controlling the actuator to move the first resonator relative to the second resonator and thus varying a distance (108) defined between the resonators (102, 104). One or both of the resonators may have a controllable element embedded therein for controlling a resonant frequency of that resonator. The controllable element may be a variable capacitor. In the example embodiment of Figure 1, the first resonator (102) has a first variable capacitor (110) embedded therein and the second resonator (104) has a second variable capacitor (112) embedded therein. Each variable capacitor (110, 112) may include two spaced apart conductive plates, which may be parallel to one another. The control module (106) may be configured to control each capacitor by varying the position of one conductive plate relative to the other conductive plate to change and control the resonant frequency of the resonator. For example, the control module (106) may be configured to vary distance (114) between the conductive plates of each variable capacitor (110, 112), to control the resonant frequency of each resonator (102, 104). The resonant frequency of a resonator depends on several parameters, including the geometry and dimensions of the resonator. Parameters such as geometry (including e.g., dimensions, shape, size, etc.), orientation and composition may for example determine natural resonant modes of a given resonator. By tuning these parameters, the quality factor and resonant frequencies of the resonator can be configured to achieve a desired resonance profile. For example, Figures 2A and 2B show an example resonator (202) and a plot which illustrates a frequency response of the resonator (202). The plot shows a Lorentzian resonance profile with a peak (210) at a frequency fn. The quality factor Q of the resonator (202) may be determined by the 3dB bandwidth. The resonance frequency fn and quality factor Q may depend on the geometries and materials of the resonator (202). By tuning the parameters of the resonator (202), it can provide selective frequency filtering with high-quality factor resonances. The resonant frequency of a resonator may also depend on the capacitance of a variable capacitor embedded therein. By varying the capacitance of the capacitor, the resonant frequencies of the resonator can be configured to achieve a desired resonance profile. For example, Figures 3A and 3B show an example resonator (302) including a variable capacitor (304) embedded therein and a plot which illustrates a frequency response due to a change in capacitance of the resonator (302). In this example, the variable capacitor (304) may be formed of two parallel and spaced apart conductive plates (306, 308) and the capacitance may be mechanically or electronically tuned by varying the distance (310) between the conductive plates. Changing the capacitance of the resonator (302) shifts the resonance frequency (320, 322) of the resonator (302) enabling dynamic control of the Lorentzian response. Coupling between two resonators may be controlled by varying a distance between the resonators and this can be configured to achieve a desired resonance profile. For example, Figures 4A and 4B show coupling between two resonators (402, 404) and a plot which illustrates a frequency response due to mutual coupling between the resonators. The first resonator (402) may support a broad resonance profile and may have a first quality factor Q1, and the second resonator (404) may support a narrow discrete resonance profile and may have a second quality factor Q2. The first quality factor Q1 may be lower than the second quality factor Q2. The two resonators (402, 404) may be positioned in close proximity to allow coupling between their interior electromagnetic fields through the distance (406) separating them. This coupling may result in interference between the broad resonance of the resonator (402) and the narrow resonance of the resonator (404). The interacting resonances give rise to a Fano resonance profile with a transmission maximum (410) on one side and a transmission minimum (412) on the other side of the narrow resonance as shown in Figure 4B. Varying the distance (406) between resonators (402, 404) may permit tuning the Fano responses through interference between resonators (402, 404). Referring back to Figure 1, to achieve a localised Lorentzian resonance profile, the control module (106) is configured to control the capacitance of each resonator (102, 104) to synchronize the resonant frequency of each resonator (102, 104) and to control the actuator to minimize coupling between the resonators (102, 104) by increasing the distance between the resonators to a maximum. To achieve a Fano resonance profile the control module (106) is configured to control the capacitance of each resonator (102, 104) to detune the resonant frequency of each resonator (102, 104) and to control the actuator to enable coupling between the resonators (102, 104) by decreasing the distance between the resonators to a minimum. It is appreciated that coupling between two resonators is influenced by the distance separating them. The mechanism of coupling can be either capacitive (through the electric field) or inductive (through the magnetic field), or a combination of both. The resonators can be coupled either through the electric field (capacitive coupling) or the magnetic field (inductive coupling), or a combination of both. In the case of capacitive coupling, the strength of the coupling is inversely proportional to the distance between the resonators. As the distance between the resonators increases, the capacitive coupling decreases. This is because the electric field strength diminishes with increasing distance, resulting in a weaker coupling between the resonators. On the other hand, inductive coupling depends on the mutual inductance between the resonators. The mutual inductance is proportional to the magnetic flux linkage between the resonators, which is inversely proportional to the distance between them. Therefore, as the distance between the resonators increases, the inductive coupling decreases. Practically, the coupling mechanism is often a combination of capacitive and inductive coupling. The overall coupling strength is determined by the relative magnitudes of these, which are both inversely proportional to the distance between the resonators. To achieve an Electromagnetically Induced Transparency (EIT) response profile, the control module (106) is configured to control to the capacitance of each resonator (102, 104) to detune the resonant frequency of each resonator (102, 104) and to control the actuator to decouple the resonators to enable interaction between distinct resonance modes. The first variable capacitor (110) and second variable capacitor (112) are largely detuned, so the resonances of the resonators (102, 104) differ significantly. The capacitive detuning decouples the resonators (102, 104) and creates two distinct resonance dips (502, 504) in the frequency response as shown in Figure 5. The interaction between the largely detuned resonators (102, 104) produces a characteristic EIT transmission peak (506) between the dips. By tuning the capacitors (110, 112) to be off-resonance relative to each other, the apparatus may exhibit an EIT-like response arising from the field interaction between the decoupled resonators (102, 104). It is appreciated that EIT response can be obtained through detuning of resonators. The key to achieving an EIT-like response in resonators lies in the interaction between two distinct resonance modes of a coupled system. In this case, the two resonators are initially coupled to each other. Initially, when the resonators are tuned to the same resonant frequency and strongly coupled, their resonance modes hybridize, resulting in a single broad resonance dip in the frequency response. This is analogous to an opaque region in an EIT system, where the medium strongly absorbs or reflects the incident electromagnetic waves. To achieve an EIT-like response, the resonators are detuned by adjusting their capacitances, effectively shifting their resonant frequencies apart. This detuning process decouples the resonators and allows their distinct resonance modes to interact in a specific way. When the resonators are significantly detuned, their individual resonances appear as two separate dips in the frequency response. However, due to the weak residual coupling between the resonance modes, a narrow transmission peak emerges between these two dips. This transmission peak is the characteristic feature of an EIT-like response. The underlying mechanism behind this transmission peak is the destructive interference between the direct excitation of a "bright" mode and the indirect excitation of a "dark" mode through the "bright" mode. This interference cancels out the absorption or reflection within a narrow frequency range, creating a transparency window within the otherwise opaque region. The depth and width of the EIT-like transmission peak can be controlled by adjusting the detuning and the residual coupling between the resonators. Larger detuning generally leads to a narrower and deeper transmission peak, while stronger residual coupling results in a broader and shallower peak. Controlling coupling between the resonators (102, 104) and the capacitance of the capacitors (110, 112) controls constructive or destructive interferences between the resonators to dynamically switch between Fano resonance, Lorentzian resonance, and Electromagnetically Induced Transparency resonance profiles. This may allow real time, in situ control over the resonant behaviour of the resonator apparatus (100). The resonator apparatus (100) may find application in a vehicle, such as an unmanned aerial vehicle (UAV), to provide control over the scattering signature of the vehicle. In some examples, the control module may control constructive or destructive interferences between the resonators to change the radar cross section of the vehicle as perceived by a radar attempting to detect and / or track the vehicle. The control module may for example cycle through different resonance profiles to confuse the radar and / or tracking algorithms being used to track the vehicle. In some examples, the apparatus (100), acting as an antenna, may be connected a transceiver for transmitting and receiving signals such as communication signals. The control module may control constructive or destructive interferences between the resonators in response to receiving an indication of a jamming attack. In some examples, the control module may control constructive or destructive interferences between the resonators to produce an EIT resonance or Fano resonance profile in response to receiving the indication of the jamming attack. In some examples, the control module may control constructive or destructive interferences between the resonators to produce a Lorentzian resonance profile in response to receiving an indication of no jamming attack. It is appreciated that resonator-based apparatuses can be used as antennas or coupled to antennas for wireless communication systems. Jamming signals or external perturbations can disrupt the delicate interference conditions required for certain resonance profiles, such as the Lorentzian response. Both EIT and Fano resonances are characteristic responses observed in coupled resonator systems when specific interference conditions are met. For example, EIT resonances arise due to the destructive interference between a "bright" mode and a "dark" mode creating a narrow transparency window within an otherwise opaque frequency region. While Fano resonances are asymmetric line shapes resulting from the interference between a narrow discrete resonance and a broader continuum of states. These resonance profiles can be engineered by controlling the coupling and interference between the resonators, and their presence or absence can be an indicator of external disturbances or jamming attacks. A Lorentzian resonance profile, characterized by a sharp peak with symmetric tails, is typically observed when the resonators are strongly coupled and constructively interfering. The presence of a Lorentzian resonance profile can indicate that the system is operating in a stable, non-jammed condition, as it requires precise interference conditions that can be disrupted by external perturbations or jamming signals. Aspects of the present disclosure provide a resonator apparatus and system configured for adaptive control over an electromagnetic signature using electronic approaches to enable in-flight switching between stealthy and observable modes. In some examples, a vehicle such as a UAV is provided which includes a reconfigurable resonator apparatus capable of switching between Fano, Lorentzian, and Electromagnetically Induced Transparency (EIT) spectral line shapes. The apparatus comprises resonators and tunable capacitors embedded in them. By controlling the coupling between the resonators and tuning of the capacitors, constructive or destructive interference is created resulting in Fano, Lorentzian, and EIT responses as per requirement. The reconfigurable resonator apparatus provides the UAV with tunable control over its scattering signature. By switching between Fano, Lorentzian, and EIT modes, the radar cross-section is changed. This enables stealth capabilities and radar confusion to avoid detection. The reconfigurable resonator apparatus allows the UAV to dynamically switch between different frequency responses during flight based on the application need, environment, or mission objectives, without physical modification. For example, Fano resonance could be used for sensing or filtering needs, Lorentz for oscillation sources, and EIT for low-loss communications. The inflight tuning enables adapting the response in real time. The ability to convert between multiple resonance phenomena electronically using an integrated UAV-mounted apparatus could provide versatility and advanced functionality for various aerospace, or communications applications. The disclosure accordingly provides a resonator apparatus capable of dynamic switching between Fano, Lorentzian, and EIT responses, allowing for real time in-situ control over the resonant behaviour by controlling coupling between the resonators and the capacitance of the capacitors embedded in the resonators. It will be appreciated that numerous variations and modifications may be made to the resonator apparatus as described. The foregoing description has been presented for the purpose of illustration; it is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Persons skilled in the relevant art can appreciate that many modifications and variations are possible in light of the above disclosure. The language used in the specification has been principally selected for readability and instructional purposes, and it may not have been selected to delineate or circumscribe the inventive subject matter. It is therefore intended that the scope of the invention be limited not by this detailed description, but rather by any claims that issue on an application based hereon. Accordingly, the disclosure of the embodiments of the invention is intended to be illustrative, but not limiting, of the scope of the invention, which is set forth in the following claims. 5 Finally, throughout the specification and accompanying claims, unless the context requires otherwise, the word ‘comprise’ or variations such as ‘comprises’ or ‘comprising’ will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers. 10

Claims

1. A reconfigurable resonator apparatus comprising: a control module coupled to a first resonator and a second resonator disposed next to the first resonator to define a distance between the resonators, wherein each resonator has a controllable element embedded therein for controlling a resonant frequency of that resonator, and wherein the control module is configured to control one or both of: coupling between the resonators and the resonant frequency of each resonator to control constructive or destructive interferences between the resonators and thereby to control a resonance profile thereof.

2. The apparatus as claimed in claim 1, wherein the control module is configured to control coupling by varying the distance between the resonators.

3. The apparatus as claimed in claim 2, wherein the first resonator is mounted on a platform which is moveable relative to the second resonator, and wherein varying the distance includes controlling an actuator to move the platform and thus the first resonator relative to the second resonator.

4. The apparatus as claimed in any one of the preceding claims, wherein the control module is configured to control the resonant frequency of each resonator by controlling the controllable element.

5. The apparatus as claimed in claim 4, wherein the controllable element is a variable capacitor and wherein controlling the controllable element includes varying a distance between conductive plates of the capacitor.

6. The apparatus as claimed in any one of the preceding claims, wherein the control module is configured: to control to the controllable element of each resonator to synchronize the resonant frequency of each resonator; and to minimize coupling between the resonators to produce a localised Lorentzian resonance profile.

7. The apparatus as claimed in any one of the preceding claims, wherein the control module is configured: to control to the controllable element of each resonator to detune the resonant frequency of each resonator; and to enable coupling between the resonators to produce a Fano resonance profile.

8. The apparatus as claimed in any one of the preceding claims, wherein the control module is configured: to control to the controllable element of each resonator to largely detune the resonant frequency of each resonator; and to decouple the resonators to enable interaction between distinct resonance modes to produce an Electromagnetically Induced Transparency (EIT) response profile.

9. The apparatus as claimed in any one of the preceding claims, wherein controlling coupling between the resonators and the controllable elements dynamically switches between Fano, Lorentzian and EIT resonance profiles.

10. The apparatus as claimed in any one of the preceding claims, wherein the first resonator has a first quality factor and the second resonator has a second quality factor, wherein the first quality factor is different from the second quality factor.

11. The apparatus as claimed in claim 10, wherein the first quality factor is lower than the second quality factor.

12. The apparatus as claimed in any one of the preceding claims, wherein the apparatus is provided in an unmanned aerial vehicle (UAV) to provide control over a scattering signature of the UAV.

13. The apparatus as claimed in any one of the preceding claims, wherein the apparatus is connected to a transceiver for transmitting and receiving signals.

14. The apparatus as claimed in claim 13, wherein the signals are communication signals.

15. The apparatus as claimed in any one of the preceding claims, wherein the control modulecontrols constructive or destructive interferences between the resonators in response to receiving an indication of a jamming attack.

16. The apparatus as claimed in claim 15, wherein the control module controls constructive or destructive interferences between the resonators to produce an EIT resonance or Fano resonance profile in response to receiving the indication of the jamming attack.

17. The reconfigurable resonator apparatus as claimed in claim 15 or claim 16, wherein the control module controls constructive or destructive interferences between the resonatorsto produce a Lorentzian resonance profile in response to receiving an indication of no jamming attack.

18. A vehicle comprising the reconfigurable resonator apparatus as claimed in any one of the 5 preceding claims.

19. The vehicle as claimed in claim 18, wherein the vehicle is an unmanned ariel vehicle.AMENDMENTS TO THE CLAIMS HAVE BEEN FILED AS FOLLOWS:CLAIMS:

1. A reconfigurable resonator apparatus comprising: a control module coupled to a first resonator and a second resonator disposed next to the first resonator to define a distance 5 between the resonators, wherein each resonator has a controllable element embeddedtherein for controlling a resonant frequency of that resonator, and wherein the control module is configured to control one or both of: coupling between the resonators and the resonant frequency of each resonator to control constructive or destructive interferences between the resonators and thereby to control a resonance profile thereof; and wherein 10 controlling coupling between the resonators and the controllable elements dynamicallyswitches between Fano, Lorentzian and EIT resonance profiles.

2. The apparatus as claimed in claim 1, wherein the control module is configured to control coupling by varying the distance between the resonators.

153. The apparatus as claimed in claim 2, wherein the first resonator is mounted on a platform Xl which is moveable relative to the second resonator, and wherein varying the distanceC\J* includes controlling an actuator to move the platform and thus the first resonator relativeto the second resonator.1 20LO 4. The apparatus as claimed in any one of the preceding claims, wherein the control moduleis configured to control the resonant frequency of each resonator by controlling the controllable element.25 5. The apparatus as claimed in claim 4, wherein the controllable element is a variablecapacitor and wherein controlling the controllable element includes varying a distance between conductive plates of the capacitor.

6. The apparatus as claimed in any one of the preceding claims, wherein the control module 30 is configured: to control to the controllable element of each resonator to synchronize theresonant frequency of each resonator; and to minimize coupling between the resonators to produce a localised Lorentzian resonance profile.

7. The apparatus as claimed in any one of the preceding claims, wherein the control module 35 is configured: to control to the controllable element of each resonator to detune theresonant frequency of each resonator; and to enable coupling between the resonators to produce a Fano resonance profile.

8. The apparatus as claimed in any one of the preceding claims, wherein the control module is configured: to control to the controllable element of each resonator to largely detune the resonant frequency of each resonator; and to decouple the resonators to enable 5 interaction between distinct resonance modes to produce an Electromagnetically InducedTransparency (EIT) response profile.

9. The apparatus as claimed in any one of the preceding claims, wherein the first resonator has a first quality factor and the second resonator has a second quality factor, wherein the 10 first quality factor is different from the second quality factor.

10. The apparatus as claimed in claim 9, wherein the first quality factor is lower than the second quality factor.15 11. The apparatus as claimed in any one of the preceding claims, wherein the apparatus isprovided in an unmanned aerial vehicle (UAV) to provide control over a scattering Xl signature of the UAV.CM12. The apparatus as claimed in any one of the preceding claims, wherein the apparatus is 1 20 connected to a transceiver for transmitting and receiving signals.LO13. The apparatus as claimed in claim 12, wherein the signals are communication signals.

14. The apparatus as claimed in any one of the preceding claims, wherein the control module25 controls constructive or destructive interferences between the resonators in response toreceiving an indication of a jamming attack.

15. The apparatus as claimed in claim 14, wherein the control module controls constructive or destructive interferences between the resonators to produce an EIT resonance or Fano 30 resonance profile in response to receiving the indication of the jamming attack.

16. The reconfigurable resonator apparatus as claimed in claim 14 or claim 15, wherein the control module controls constructive or destructive interferences between the resonators to produce a Lorentzian resonance profile in response to receiving an indication of no 35 jamming attack.

17. A vehicle comprising the reconfigurable resonator apparatus as claimed in any one of the preceding claims.

18. The vehicle as claimed in claim 17, wherein the vehicle is an unmanned ariel vehicle.5CM 1— LO

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