A 5:1 connected slot array loaded with artificial dielectric layers

Abstract

We propose a radiation concept to realize phased arrays with wideband and wide-scanning performance. The array is based on connected-slot elements that radiate in the presence of artificial dielectric superstrates. The array can be implemented with a single multi-layer printed circuit board. Artificial dielectrics are used in place of real dielectrics to minimize the losses due to surface waves and avoid the occurrence of scan blindness over a wide scan range. The achievable bandwidth depends on the number of layers composing the artificial dielectric. A design example is shown that achieves a bandwidth (VSWR ) of about when scanning up to in all azimuth planes. Both single-and dualpolarization designs can be implemented.

Development of Double Flare Angle bowtie slot Antenna for Multichroic CMB Polarization Detectors

“…4a separate from the antenna by a 1 µm SiOx dielectric layer with ε r = 4.318 ( [20,21]). The feedline terminates by a radial stub that provides wideband impedance matching and exhibits a virtual short-circuit to the antenna ground [22,23]. Both antenna's ground plane and microstrip are made of Niobium, which exhibits kinetic inductance when in a superconducting state.…”

A Wide-Band Self-Complementary Tightly-Coupled Dipole Array With ±80° Scanning Range in the E Plane

“…And there is no scanning blindness in the E, H, and D planes. Although the phased array in [9] can achieve 50°scanning in the H plane, there are 11 dielectric substrate layers above the array. In [8], the phased array can achieve 50°scanning in the H plane, but 13 dielectric substrate layers are loaded above the array.…”

“…It can be seen that they used many layers of dielectric blocks to increase the scanning angle in the H plane. So, it is hard to match the impedance in the H plane in [6][7][8][9]. However, in this paper, only a dielectric substrate layer of the WAIM layer is loaded, which can reduce the design complexity of the WAIM layer and achieve ±80°s canning in the E plane.…”

“…In Ref. [9], the slot array with artificial dielectric superstrates achieved ±50°s canning in all azimuth planes with a 5:1 bandwidth, but the number of the artificial dielectric superstrate layers reached 11 layers.…”

“…Although the 3dB beamwidth of the antenna element is very wide, the impedance matching of the array will become seriously bad when it scans to a large angle. Therefore, a WAIM layer is needed to be loaded over the antenna to achieve a good impedance matching [8][9]13]. Finally, an SC-TCDA with one dielectric layer is proposed.…”