Browsing by Author "Beruete, M."
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Item Comment on "A waveguide slit array antenna fabricated with subwavelength periodic grooves Appl. Phys. Lett. 91 143512 (2007)"(2008) Beruete, M.; Falcone, F.; Sorolla, M.; Campillo, I.; Dolado, J. S.; Rodríguez-Seco, J. E.; Perea, E.; Tecnalia Research & Innovation; POWER SYSTEMS; DIGITAL ENERGYItem Comments on "a high-gain antenna consisting of two slot elements with a space larger than a wavelength"(2010) Beruete, M.; Campillo, I.; Dolado, J. S.; Rodríguez-Seco, J. E.; Perea, E.; Falcone, F.; Sorolla, M.; Tecnalia Research & Innovation; POWER SYSTEMS; DIGITAL ENERGYItem Enhanced gain by double-periodic stacked subwavelength hole array(2007-12) Beruete, M.; Campillo, I.; Rodríguez-Seco, J. E.; Perea, E.; Navarro-Cía, M.; Núñez-Manrique, I. J.; Sorolla, M.; POWER SYSTEMS; DIGITAL ENERGY; Equipos ElectrónicosUsing a doubly periodicity structure the extraordinary transmission of subwavelength metallic hole arrays in the microwave range can be boosted. Stacking several of such plates a left-handed metamaterial can be obtained as it is shown by the computed dispersion diagrams as well as the amplitude and phase measurements. An effective refraction index along the propagation direction can be calculated, giving a negative magnitude between -1 and 0. This enhances the emission by a focused beam with narrow beamwidth. Several practical applications like novel antennas are envisaged.Item Enhanced microwave transmission and beaming using a subwavelength slot in corrugated plate(2004-12) Beruete, M.; Campillo, I.; Dolado, J. S.; Rodríguez-Seco, J. E.; Perea, E.; Sorolla, M.; Tecnalia Research & Innovation; POWER SYSTEMS; DIGITAL ENERGYEnhanced microwave transmission and beaming through a subwavelength slot placed into a corrugated conducting plate is experimentally observed compared with the case of the single isolated slot. This phenomenon is similar to that happening for optical wavelengths where surface plasmons model is employed to describe the metal. This letter shows that the phenomenon is also present in the microwave range where perfect conductor model applies. Enhanced subwavelength transmission and beaming stimulates new research for future applications.Item Enhanced microwave transmission using a subwavelength slot in corrugated plate(2005) Beruete, M.; Campillo, I.; Dolado, J. S.; Rodríguez-Seco, J. E.; Perea, E.; Sorolla, M.; Tecnalia Research & Innovation; POWER SYSTEMS; DIGITAL ENERGYThe new phenomenon related with enhanced microwave transmission and beaming through a subwavelenght slot placed into a corrugated conducting plate has been experimentally observed, in the microwave range, compared with the case of the single isolated slot. It is very similar to that happening for optical wavelengths where surface plasmons model is employed to describe the metal. The phenomenon is also present in the microwave range where perfect conductor model applies. Future applications in antennas can be possible.Item Enhanced millimeter wave transmission through quasioptical subwavelength patterned structures(2004) Beruete, M.; Sorolla, M.; Campillo, I.; Dolado, J. S.; Martín-Moreno, L.; García-Vidal, F. J.; Tecnalia Research & InnovationWe show that the phenomenon of extraordinary transmission though arrays of subwavelength holes is also present in the microwave range as it occurs in the optical regime. Following simulations of the influence of the number of holes, a prototype has been designed and fabricated in an Aluminum plate. By using a Millimeter Wave Quasioptical Vector Network Analyzer in the range between 40 GHz and 110 GHz, measurements of the transmission response has been performed. A resonant total transmission at wavelengths close to the period of the array appear in the spectra. Moreover, an structure consisting of a single narrow slit flanked by a finite array of grooves is now under consideration. All these structures operating in the subwavelength regime are opening the possibility of exciting future applications.Item Enhanced millimeter-wave transmission through subwavelength hole arrays(2004-11-01) Beruete, M.; Sorolla, M.; Campillo, I.; Dolado, J. S.; Martín-Moreno, L.; Bravo-Abad, J.; García-Vidal, F. J.; Tecnalia Research & InnovationWe explore, both experimentally and theoretically, the existence in the millimeter-wave range of the phenomenon of extraordinary light transmission through arrays of subwavelength holes. We have measured the transmission spectra of several samples made on aluminum wafers by use of an AB Millimetre quasi-optical vector network analyzer in the wavelength range 4.2-6.5 mm. Clear signals of the existence of resonant light transmission at wavelengths close to the period of the array appear in the spectra.Item Increase of the transmission in cut-off metallic hole arrays(2005-02) Beruete, M.; Sorolla, M.; Campillo, I.; Dolado, J. S.; Tecnalia Research & InnovationIn this letter, the phenomenon of extraordinary transmission through arrays of subwavelength holes in the microwave range is demonstrated. It is also shown that the magnitude of the transmission is strongly dependent on the number of holes in the sample. Prototypes have been designed and fabricated in an Aluminum plate. The transmission response is measured with a millimeter wave quasi-optical vector network analyzer in the range between 40 and 70 GHz. These measurements show a resonant total transmission at wavelengths close to the period of the array which depends strongly on the number of resonant holes. These results can give rise to interesting applications such as frequency selective surfaces and other quasi-optical structures.Item Low profile antenna feeders based of enhanced microwave transmission through a narrow slot on a corrugated plane(2006-05) Beruete, M.; Campillo, I.; Dolado, J. S.; Rodríguez-Seco, J. E.; Perea, E.; Falcone, F.; Sorolla, M.; Tecnalia Research & Innovation; POWER SYSTEMS; DIGITAL ENERGYIn this work, several antenna prototypes based on the Extraordinary Optical Transmission phenomenon are developed. They all share in common the property of being all-metallic, flat and low profile. The radiation of a central slot is boosted by texturing the output metallic plane. Enhancement depends directly on the number of grooves carved. Thus, a rich variety in the farfield response can be obtained changing the number of corrugations. Among the prototypes a dual-operating-band planar horn antenna with low profile is presented. It is also seen that by giving the structure rotational simmetry the gain can be increased, resulting in the high-gain Bull's-Eye antenna. Other approaches related with the perturbation profile are under development. The behavior of the current prototypes is very similar to those reported in optics. In this way, a new concept of a very low profile feeder is proposed with potential wireless applications.Item Low-profile corrugated feeder antenna(2005) Beruete, M.; Campillo, I.; Dolado, J. S.; Rodriguez-Seco, J. E.; Perea, E.; Falcone, F.; Sorolla, M.; Tecnalia Research & Innovation; POWER SYSTEMS; DIGITAL ENERGYA very low-profile planar rectangular horn antenna made of a subwavelength aperture surrounded by two grooves on the conducting plate is presented. This structure exhibits good return losses and radiated beam. Its operation is based upon enhanced transmission and beaming through apertures in metallic corrugated plates. Here, the corrugated structure is designed to operate in microwaves and, moreover, a waveguide flange, which has been properly mechanized in the rear part of the structure, is employed for excitation. A new very low-profile planar feeder with reduced size is introduced that could be properly scaled for potential wireless applications.Item Phase response of cut-off metallic hole arrays(2005) Beruete, M.; Campillo, I.; Dolado, J. S.; Sorolla, M.; Lomakin, V.; Michielsen, E.; Tecnalia Research & InnovationItem Subwavelength hole arrays, and split ring resonators based metasurfaces for frequency selective surfaces(2004) Beruete, M.; Baena, J. D.; Falcone, F.; Campillo, I.; Dolado, J. S.; Lopetegi, T.; Laso, M. A.G.; Bonache, J.; García-García, J.; Marcotegui, A.; Martín, F.; Marqués, R.; Sorolla, M.; Thumm, M.; Wiesbeck, W.; Tecnalia Research & InnovationThis paper shows several possibilities for the design of metasurfaces based on etching holes in metallic plates, making corrugations surrounding an slit on the plate, and by introducing the concept of complementary split ring resonator. Enhanced transmission phenomena has been experimentally demonstrated in all three cases.Item Subwavelength slotted corrugated plate with enhanced quasioptical millimeter wave transmission(2005-04) Beruete, M.; Sorolla, M.; Campillo, I.; Dolado, J. S.; Tecnalia Research & InnovationEnhanced millimeter wave transmission through a subwavelenght slot placed into a corrugated conducting wafer, using perfect conductor model, is experimentally observed compared with the case of the single isolated slot. The corrugated wafer responds in a similar way as in the optical regime, in which a surface plasmon model is employed to describe the metal. Experimental results of the enhanced transmission and reflection of the corrugated wafer have been measured by using a quasioptical vector network analyzer. Future applications of enhanced subwavelength transmission in quasioptical devices are envisaged.Item Transmission in cut-off hole arrays(2004) Beruete, M.; Falcone, F.; Sorolla, M.; Campillo, I.; Dolado, J. S.; Martín-Moreno, L.; García-Vidal, F. J.; Tecnalia Research & InnovationWe show that the phenomenon of extraordinary transmission though arrays of subwavelength holes is also present in the microwave range as it occurs in the optical regime. Following simulations of the influence of the number of holes, a prototype has been designed and fabricated in s.n Aluminum plate. By using a Millimeter Wave Quasioptical Vector Network Analyzer in the range between 40 GHz and 110 GHz, measurements of the transmission response has been performed. A resonant total transmission at wavelengths close to the period of the array appear in the spectra opening the possibility of exciting future applications.Item Very low profile and dielectric loaded feeder antenna(2007) Beruete, M.; Campillo, I.; Dolado, J. S.; Rodríguez-Seco, J. E.; Perea, E.; Falcone, F.; Sorolla, M.; Tecnalia Research & Innovation; POWER SYSTEMS; DIGITAL ENERGYIn this letter, very low profile planar horn antenna feeders are designed and measured. Using previous results of antennas consisting of a narrow slot on a metallic plane and flanked by two grooves, a further step is given here by reducing the thickness of the prototype. A key factor in the approach is the operation in the transversal slot resonance instead of the usual longitudinal slot resonance. Moreover, by inserting a dielectric material of relative permittivity εr > 1, the thickness can be further reduced, maintaining and even improving the radiation features of the prototype. Reducing the metallic plate thickness has important consequences in the weight and profile of the antennas, making them easy to handle and to fit into different structures. In addition, in ranges where the wavelength is of the order of centimeters, a thick metallic plate can be a serious drawback due to mechanical restrictions. In these cases the design following the rules given in this letter can alleviate this constraint.Item Very low-profile "bull's eye" feeder antenna(2005) Beruete, M.; Campillo, I.; Dolado, J. S.; Rodríguez-Seco, J. E.; Perea, E.; Falcone, F.; Sorolla, M.; Tecnalia Research & Innovation; POWER SYSTEMS; DIGITAL ENERGYIn this letter, a very low-profile planar horn antenna is proposed. It consists of a subwavelength aperture placed into a "Bull's Eye" concentric periodic corrugated conducting plate that produces good return losses and a narrow radiated beam. The antenna is excited by means of a waveguide whose flange has been properly mechanized in the rear part of the structure. The mechanism explaining this phenomenon is similar to the enhanced transmission observed at optical wavelengths in similar structures. In this work, the circularly corrugated structure has been scaled into the microwave frequency range and, moreover, the plane wave excitation has been replaced by a subwavelength aperture excited by a conventional closed metallic waveguide. This transforms the original focusing structure into a new concept of a very low-profile feeder with potential applications.