Self and mutual admittance of CPW‐FED slots on conductor‐backed two‐layer substrate

Abstract

A characterization of the mutual admittance between CPW‐fed slot antennas on a practically feasible conductor‐backed two‐layer substrate is provided in conjunction with a characterization of isolated slot resonant self‐properties. This data is of interest for linear array design purposes. Numerical results are validated by a measurement. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2798–2802, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22866

Design of Non-Uniformly Excited Linear Slot Arrays Fed by Coplanar Waveguide

“…Increases in slot length result in offsets of phases with respect to phases of preceding lengths. Similar graphs were obtained for slots on conductor-backed two-layer substrates (Jacobs, 2007).…”

“…Contrary to the nearly constant phases of CPW-fed slots with half-lengths in the vicinity of the first-resonant half-length (Jacobs, 2007), the phases of these second-resonant slots exhibit a sharp rise close to the CPW feed line, while changing little in the outer reaches of the slots. Increases in slot length result in offsets of phases with respect to phases of preceding lengths.…”

Characterization of a first‐resonance CPW‐fed slot as an array element

“…The resistance at the first-resonance is found to be very high (ϳ600 ⍀), while the resistance at the second-resonance is at a much more practical level for array design (in this specific case ϳ20 ⍀)-hence the use of the second-resonance for CPW-fed slot arrays. The width of the slot is the parameter that allows some control over the first-and second-resonance impedance level, as was shown in [2], for conductor-backed CPW-fed slots in this case. In [1], an approximate design procedure for a linear array of such second-resonance slots are described and results shown for a manufactured array.…”

“…An exception is coplanar waveguide (CPW) fed slot arrays, where second-resonance slots are normally used as array elements [1,2]. Figure 1(a) shows such a typical slot fed by CPW.…”

CPW-Fed Cavity-Backed Slot Radiator Loaded With an AMC Reflector

“…A fair amount of work was published on socalled conductor-backed CPW-fed slot antennas, where single or multiple dielectric layers were inserted between the upper conducting surface containing the slot and the reflector [3][4][5][6]. Energy leakage between the parallel plates because of unwanted modes remains a problem for conductor-backed slot radiators and special techniques have to be used to overcome this, eg.…”