Computer-aided design of a CPW-fed slot antenna for MM-wave applications

Abstract

This article presents a comprehensive parametric study with experimental characterization of an inductively coupled CPW-fed slot antenna on a GaAs substrate for MMIC applications. The length, width, and feed inset of the antenna are varied and their influences on the input impedance, bandwidth, and gain are investigated. The parametric study reveals that the slot length is the prime factor for determining the resonant frequency, while the width is used for fine-tuning of resonant frequency and gain-bandwidth product. For the fixed slot dimensions, the feed inset tremendously affects both resonant frequency and input match. The manufactured antenna resonates at 22.4 GHz with a 6.1% impedance bandwidth, 2% gain bandwidth, 2.5-dBi boresight gain, and 5-dB front-to-back (F/B) radiation level. The antenna exhibits bidirectional radiation patterns with almost omnidirectional patterns in the E-plane and a wide beamwidth of 84°3-dB beam width in the H-plane.

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

“…It is possible to utilize CPW-fed slots at their first resonant frequency, and half-wavelength capacitively-fed slots have previously been proposed as suitable single-element radiators [3][4][5]. Such a capacitively-fed slot is shown in Figure 2.…”

“…The microstrip slot coupled feed to the DRA has been well studied in [2][3][4][5]. In [2][3][4], investigation of the microstrip slot coupled to the DRA was accomplished with the coupling slot in the common ground plane transverse to the microstrip feed line. In [5], the input impedance for the microstrip line exciting a hemispherical DRA through an inclined slot was evaluated.…”