Broadband frequency and angular response of a sinusoidal bull’s eye antenna

Abstract

A thorough experimental study of the frequency and beaming angle response of a metallic leaky wave Bull's-Eye antenna working at 77 GHz with a sinusoidally corrugated profile is presented. The beam scanning property of these antennas as frequency is varied is experimentally demonstrated and corroborated through theoretical and numerical results. From the experimental results the dispersion diagram of the n = 1 and n = 2 space harmonics is extracted, and the operation at different frequency regimes is identified and discussed. In order to show the contribution of each half of the antenna, numerical examples of the near-field behavior are also displayed. Overall, experimental results are in good qualitative and quantitative agreement with theoretical and numerical calculations. Finally, an analysis of the beamwidth as a function of frequency is performed, showing that it can achieve values below 1.5 deg in a fractional bandwidth of 4% around the operation frequency, which is an interesting frequency-stable broadside radiation.

Far-Field and Near-Field Physics of Extraordinary THz Transmitting Hole-Array Antennas

“…Additionally, a noticeable amount of energy is radiated into large angles. This can be associated with the fundamental m = 0 space harmonic of the complex wave, which runs very close to the light line [35] (i.e., it is almost like a plane wave at grazing angle). As the number of apertures is increased, these two contributions become clearer, because the contribution from the diffracted field by the edges of the array is reduced.…”

“…Then, using the formula for the space harmonics and what we learned from Fig. 5(a), the four zeroes with the smallest value of the real part of k x can be identified as the m = −1 space harmonics, which, above the first Wood's anomaly, shift away from the origin of the complex k x plane as frequency increases [35]. Furthermore, the value of k 0 surpasses the limits of the first Brillouin zone, and thus, it does not contribute to the far-field radiation.…”

“…Furthermore, the value of k 0 surpasses the limits of the first Brillouin zone, and thus, it does not contribute to the far-field radiation. However, m = −2 space harmonics enter the radiation region [35] and contribute to the far-field. The exact positions of the 12 zeroes are k x,−1 = ±k 0 (0.31 ± 0.028), k x,−2 = ±k 0 (0.53 ± 0.028), and k x,0 = ±k 0 (1.15 ± 0.028).…”

Model analysis of coupled‐mode leaky‐wave antenna for forward and backward frequency scanning

“…In the past years, new types of LWAs have been proposed with novel design techniques, methodologies, and new analysis. Developments of broadside radiating LWAs, CRLH structures, dual CRLH structures, and beam scanning application for sensor networks have brought LWAs to much lime light …”

“…Developments of broadside radiating LWAs, CRLH structures, dual CRLH structures, and beam scanning application for sensor networks have brought LWAs to much lime light. [12][13][14][15][16][17] The zigzag LWA structure is proposed in this article with a coupled mode analysis that resulted in dual scanning, both forward and backward. This concept explains the dual scanning in the forward direction as well as backward direction both in the right-hand quadrant.…”