Full-Metal K-Ka Dual-Band Shared-Aperture Array Antenna Fed by Combined Ridge-Groove Gap Waveguide

Abstract

This paper presents an 8×8 dual-band sharedaperture array antenna operating in K (19.5-21.5 GHz) and Kaband (29-31 GHz) using Gap Waveguide technology. Radiating elements consist of circular apertures located on the top plate of the antenna and excited by two stacked cavities with different diameters for dual-frequency operation. A waffle grid is used on top to increase the effective area of apertures and reduce grating lobes. Each stacked cavity is fed by its appropriate corporate-feeding network: the upper feeding layer operates at 20-GHz band and the lower one at 30-GHz band. As a result, the antenna presents two ports, one for each band, which radiate a directive farfield pattern with linear polarization, orthogonal to each other. Experimental results show impedance and radiation pattern bandwidths larger than 1.5 GHz in both bands.

Optimal Design of Elliptical Beam Cassegrain Antenna

“…11 In addition, the performance of previously reported elliptical-beam antennas and this prototype are compared in Table 2. The reported antennas [4]- [9] operate at only one band or at one frequency, and measured FSLLs are worse than -14dB, and the measured total efficiency is not given. It is noticed that the prototype developed by the proposed method can cover the Ku/Ka dual-band with relatively low FSLLs below -14dB in both elevation and azimuth plane.…”

“…As an essential component, the antenna for satellite communication on the move is required to be not only low profile, but also high gain, low side-lobe level, low cross-polarization, and even multi-band compatibility [1]- [3]. There are four main types of antenna with low profile for satellite communications on the move, a planar waveguide array antenna [4], phased array antenna [5], [6], Luneburg lens antenna [7] and elliptical beam reflector antenna [8]. The planar waveguide array antenna has a lower profile and high efficiency, but it is difficult to achieve high gain (for example, greater than 38dB in Ku band) and dual band operation (Ku/Ka dual-band), because of the loss increase of its feeding network and the bandwidth limit of the element and array.…”

Dual-Band Single-Layer Slot Array Antenna Fed by K/Ka-Band Dual-Mode Resonators in Gap Waveguide Technology

“…A promising all-metal approach in that regard was presented in [10], consisting of a a dual-band antenna array in Gap Waveguide (GW) technology. In this antenna, shared circular apertures excited by stacked cylindrical cavities are used as radiating elements.…”

A Wide-Band High-Efficiency Hybrid-Feed Antenna Array for mm-Wave Wireless Systems

“…However, the high precision diffusion bonding process used in these antenna arrays will bring high fabrication cost. The gap waveguide (GWG) technology [16][17][18] uses an artificial magnetic conductivity (AMC) boundary to build the side-wall of a rectangular waveguide. Based on this technology, a low-loss waveguide transmission line can be fabricated without any expensive bonding process.…”