Design of a linear nonuniform CPW‐fed slot array with reduced sidelobe levels

Abstract

A linear nonuniform CPW‐fed slot array was designed using an iterative procedure. Theoretical and measured highest sidelobe levels of about −17 dB and −16 dB, respectively, were achieved. These are substantially lower than that of previously reported arrays of this sort, validating the accuracy of the approximate method—permitted by the electrically thin substrate—used to calculate mutual coupling. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2175–2178, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24532

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

“…This section describes design of a linear non-uniform slot array series-fed by CPW, on an electrically thin substrate for computational simplification, with sidelobe levels substantially reduced beyond that of a uniform array (Jacobs & Joubert, 2009b). The geometry of such a linear array is as shown in Fig.…”

“…In the sub-millimeter and millimeter-wave ranges, CPW-fed slots have been used to feed dielectric lens antennas (Focardi et al, 2002); arrays of CPW-fed slots are also expected to be used for space applications (Neto et al, 2003). While a variety of CPW-fed slot arrays have been reported (see section 3), rigorous design procedures for CPW-fed slot arrays that incorporate the effects of element interactions in the form of mutual coupling have only rarely been presented (Huang et al, 1999;Jacobs & Joubert, 2009b). An iterative design typically involves the a priori generation of selfadmittance data for representative slot dimensions, and requires the calculation of mutual coupling between all possible slot pairs in the array; this is especially pertinent if a nonuniform aperture distribution aimed at achieving reduced sidelobe levels is to be realized.…”

Gaussian Process Modeling of CPW-Fed Slot Antennas

“…When operated in the vicinity of its second resonance, the antenna exhibits significantly wider impedance bandwidth than a microstrip patch antenna on a comparable substrate; other advantages include easy integration with microwave circuit components due to the uniplanar configuration of the CPW feed line and radiating slot. CPW-fed slots have frequently been used in array applications, e.g., [16,17]. An example of a practical situation that requires many full-wave analyses of different slot geometries over a range of frequencies is the generation of isolated slot selfadmittance data for use in a non-uniform linear array iterative design algorithm such as [17], with the additional requirement that offresonance evaluation of array performance must be possible.…”

“…CPW-fed slots have frequently been used in array applications, e.g., [16,17]. An example of a practical situation that requires many full-wave analyses of different slot geometries over a range of frequencies is the generation of isolated slot selfadmittance data for use in a non-uniform linear array iterative design algorithm such as [17], with the additional requirement that offresonance evaluation of array performance must be possible.…”