Fig 6 - uploaded by José Luis Gómez Tornero
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Substrate-integrated waveguide leaky-wave antenna technology proposed for the 1-D quasi-Bessel beam launcher.
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Citations
... In addition, a holographic synthesizing method, which translated any requested electromagnetic modulation of β and α along the antenna into the corresponding geometrical modulation, was used to produce multiple beams [25]. Several previous designs, based on superposing multiple objective field patterns on the SinMRS, were proposed to produce multi-beams and achieve near-field focusing [26][27][28]. In this work, a superposition method based on SquMRS was used to design a dual-beam LWA, due to the capability of flexible control of phase constant and attenuation constant. ...
In this paper, a novel dual-beam leaky-wave antenna (LWA) based on squarely modulated reactance surface (SquMRS) is proposed. The equivalent transmission lines model is utilized to characterize the field distributions of surface wave guided by the SquMRS. The calculated dispersion characteristics of SquMRS are verified by the simulated results, and it is demonstrated that SquMRS exhibits a more flexible control of phase constant and attenuation constant compared with traditional sinusoidally modulated reactance surface (SinMRS), which means SquMRS has a great potential for near-field focusing and far-field beam shaping. On this basis, a versatile method, based on a superposition of individual modulation patterns, was used to generated two beams with almost identical gain at 8.5 GHz. The measured results show that the gains are 10 dBi and 8.2 dBi at θ1 = −30° and θ2 = 18°, respectively, and the radiation efficiency is 83%, which shows good agreement with the simulated results.
The concept and feasibility of deploying higher-order space harmonics (HSHs) in one-dimensional periodic leaky-wave antennas (1D-periodic LWAs) is proposed, studied, analyzed, and demonstrated in this paper. This can lead to the creation of multi-band multi-beam antennas (MBMBAs) with the capability of wide scanning ranges. To show the proposed concept, the excitation and flexibility of odd (n ϵ [-1, -3]) and even (n ϵ [-2, -4]) HSHs based on the analysis of a Brillouin diagram along with the effect of unit-cell geometrical structures of substrate integrated waveguide (SIW) for different propagating media are investigated. The proposed analysis is experimentally validated by prototyping and measuring a 1D-periodic LWA in SIW technology in which two HSHs (n ϵ [-1, -2]) are utilized for achieving a dual-band multi-beam LWA with wide scanning range capability. In addition, a triple-band multi-beam LWA design based on this concept is also analyzed and demonstrated where we take advantage of the characteristics of four HSHs (n ϵ [-1, -2, -3, -4]). Furthermore, the band edge issue of different stop-bands of HSH is also examined, and a method is proposed and used to address this issue where we use a quarter wavelength technique to overcome the matching problem at different frequencies related to different stop-bands of various HSHs (n ϵ [-1, -2, -3, -4]). Another design of an SIW-based 1D-periodic LWA is also discussed to extend and generalize the proposed concept in solving the mismatch issues of HSHs focusing on a broadside radiation of the n = -2 space harmonic. The measured results are found to agree very well with their simulation and analysis counterparts.
