Cavity‐backed slot array antenna with backward excitation

Abstract

SUMMARYThe slot array antenna with backward excitation is promising as a constituent element of a planar multisector antenna. This paper deals with a slot array antenna with backward excitation that prevents radiation into the backside by installing a cavity. With a view to simplifying the fabrication process, all slots in the array share one cavity. A design guideline is discussed for reducing mutual coupling between the elements. It is found that the cavity width should cause the TE 10 mode to be cut off. For a four-element array with a cavity satisfying this condition, the characteristics are evaluated by the spectral domain moment method. It is shown that a beam tilt toward the end fire direction can be obtained, similarly to the case without a cavity. The antenna characteristics are evaluated in terms of cavity length and depth. It is demonstrated that the effect of the cavity length on the antenna characteristics is significant and that the cavity thickness can be reduced. Further, a test experiment is conducted at 19 GHz to confirm the validity of the numerical study.

Circularly Polarized Printed Antenna Combining Slots and Patch

“…At the bottom of this antenna, a reflector is mounted to reduce the back radiation. Although this reflector makes the antenna thick, a low profile cavity slot configuration [12] will be applied and thin configuration is available.…”

Suppression method of grating lobe by pulse power transmission from an array antenna

“…(11), (12), and (13), the oblique side Z is derived. Further, by substituting condition (14), we obtain…”

“…Extensive studies of electromagnetic wave propagation have been carried out, such as Refs. [11][12][13][14][15], which consider improvement of performance and directivity by engineering the shape and arrangement of the antennas. In the present paper, in place of a large parabola antenna, an array antenna is used for forming a sharp beam because miniaturization and weight reduction are easier with this configuration.…”

Wideband Cavity-Backed Slot Antenna for Ground Penetrating Free of Direct Ground Bounce

“…And, all three prototypes exhibit at least 25% input impedance bandwidth. Furthermore, the feasibility of applying this study's cavity-backed slot antennas to realistic GPRs is investigated in a bi-static radar testbed (the cavity-backed slot antenna proposed in this article is especially suitable for bi-static/multi-static radar configurations since there is little coupling among antenna elements (Nakayama & Nakano, 2001;Yamamoto et al, 2002)). The testbed consists of a large sandpit with copper pipe buried as the target.…”