Bandwidth enhancement and size reduction of printed monopole antenna using bounding box structure

Abstract

A printed monopole antenna with enhanced bandwidth and reduced size using a bounding box structure is presented in this paper. The initial design comprises a microstrip‐fed rectangular monopole with a partial ground structure. A feed line offset, a slit etched on the feed line, an asymmetric transition connecting the feed line and the monopole, and an inverted T‐slot embedded in the ground are used to ensure good impedance matching. The design is modified by incorporating a bounding box structure, which introduces additional resonances hence an enhanced impedance fractional bandwidth reaching 156% (0.28 to 2.27 GHz) is obtained as compared to only 72% (0.75–1.60 GHz) realised for a conventional monopole. The electrical size of the proposed antenna is also reduced from 1.01λlthickmathspace×0.60λl to 0.39λl × 0.24λl (where λl denotes the wavelength corresponding to the lowest operating frequency of the antenna) using the bounding box configuration. The experimental and predicted results are in good agreement, and the proposed antenna demonstrates good radiation characteristics over the operating bandwidth. The proposed antenna can be applied in DVB (530–860 MHz), GSM850 (824–894 MHz), GSM900 (880–960 MHz) DCS (1710–1880 MHz), PCS (1850–1990 MHz), and UMTS (1920–2170 MHz) systems.

Design of Compact CPW-Fed Symmetrical Staircase-Shaped Uwb Antenna Using Transmission Line Model

“…Since the design and the fabricated antenna has a symmetrical pair of C-shaped slots, two pairs of quarter-circular-ring-slits (QCRSs), and three pairs of rectangular notches which are sequentially embedded in bottom corners of the rectangular patch, five resonant peaks, i.e., 2.31, 4.85, 8.33, 12.11, and 16.41 GHz are achieved. As a result, the proposed antenna has wider impedance bandwidth, better impedance matching, a high value of bandwidth dimension ratio (BDR) compared to the antennas presented in [5,7,11,13,14,17,18,20], and the stability of E-and H-plane is obtained. Then, an equivalent transmission line model (TLM) of the proposed antenna is developed.…”

“…Then, an equivalent transmission line model (TLM) of the proposed antenna is developed. An optimization is used in Applied Wave Research (AWR) simulator to find the circuit parameters such as resistance (R), inductance (L), and capacitance (C) of the TLM equivalent circuit using the S 11 simulated parameters [20][21][22] of the proposed antenna.…”

Broadband printed dipole antenna with integrated balun and tuning element for DTV application

“…According to the measured results, this antenna covers 450-3060 MHz frequency band with an average gain of 4.62 dBi. In [7], a printed monopole antenna features a technique of increasing its frequency band and reducing its physical size. This antenna can be used in DVB systems operating in the frequency range of 530-860 MHz.…”

Printed Monopole Antenna with Tree-Like Radiating Patch and Flower Vase-Shaped Modified Ground Plane Useful for Wideband Applications

“…The antenna provides. An antenna using a modified asymmetric feed line and T slot in the ground plane to increase bandwidth from 0.28 GHz to 2.27 GHz was reported [6]. A monopole antenna containing two tree-like patches, a bent slot, and four split ring resonators that provide a 1.15-2.90 GHz bandwidth was created for a wireless network [7].…”