A compact printed multistubs loaded resonator rectangular monopole antenna design for multiband wireless systems

Abstract

In the present article, a compact triple‐band multistubs loaded resonator printed monopole antenna is proposed. The antenna consists of a quarter wavelength two asymmetrical inverted L‐shaped stubs to excite two resonant modes for 3.5/5.5 GHz bands and one integrated horizontally T‐shaped stub with inverted long L‐shaped stub to excite resonant mode for 2.5 GHz band. By loading these stub resonators along y‐axis with distinct gaps, the antenna resonates at three frequencies 2.57/3.52/5.51 GHz covering the desired bands while keeping compact size of 24 × 30 mm2 (0.2 λ0 × 0.25 λ0). The proposed antenna is fabricated on Rogers RT/duroid 5880 substrate with thickness 0.79 mm and its performance experimentally verified. The measured results reveal that the antenna has the impedance bandwidths of about 210 MHz (2.50‐2.71 GHz), 260 MHz (3.37‐3.63 GHz), and 650 MHz (5.20‐5.85 GHz), for 2.5/3.5/5.5 GHz WiMAX and 5.2/5.8 GHz WLAN band systems. The antenna provides omnidirectional radiation patterns and flat antenna gains over the three operating bands. In addition, the design approach and effects of multistubs resonator lengths on the operating bands are also examined and discussed in detail.

Low‐cost, low‐profile and miniaturized single‐plane antenna design for an Internet of Thing device applications operating in 5G, 4G, V2X, DSRC, WiFi 6 band, WLAN, and WiMAX communication systems

“…So far, monopole antenna design with multiband operation technology is an attractive and promising solution, which recently discussed and proposed one of many novel antenna technologies. [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] In Refs. 17-20, the authors used a modified inverted-F antenna (IFA) or monopole structure with multiple branches to create multiband operation and in line with the application of wireless communication devices in Bluetooth/WLAN, WiMAX, and Wi-Fi.…”

“…The ground plane is close to the ground plane size of 8 mm × 35 mm, which is very small. Compared to the antenna proposed in the literature, [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] the proposed antenna can achieve a compact and small size. The performance of the proposed antenna is analyzed by high frequency finite element simulator and the measurement is verified in the anechoic chamber.…”

“…For the above reasons, the design goals of today's IoT device antennas need to be considered, including sufficient frequency band and bandwidth, simple design and miniaturized size. So far, monopole antenna design with multiband operation technology is an attractive and promising solution, which recently discussed and proposed one of many novel antenna technologies . In Refs.…”

“…It is stated in the literature, and that these antennas have open slots in the ground plane for multiband operation and are designed for the WLAN 2.4/5.2/5.8 GHz and LTE 2300/2500 MHz bands. Moreover, some antenna designs are composed of CPW‐Fed (CPW is coplanar waveguide) structure and radiating rectangular patch, such as references in References and . From the literature surveyed above, compact design recommendations and the effectiveness of multiband operation appear to be embedded in portable electronic and IoT devices.…”

Miniaturized Multistubs Loaded Rectangular Monopole Antenna for Multiband Applications Based on Theory of Characteristics Modes

“…Conversely, numerous varieties of microstrip-fed/coplanar-fed multiband planar slot/monopole antennas without CM theory have been reported and experimentally characterized [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] using various kinds of techniques mainly embedding/etching single/multiple stubs/strips/slots/parasitic elements of length in the order of one-fourth or half of guided wavelength (λ g /4 or λ g /2) that can explore multiple operating frequencies. To attain multiple operating resonances mainly to cover WLAN and WiMAX wireless standards, embedding a pair of T-shaped strips in a staircase wide rectangular slot antenna [13], a fractal Koch shaped slot antenna [14], three parallel rectangular open slots etched in the ground plane of the printed antenna [15], a pair of inverted-L slots in the ground plane and loaded splitring resonator (SRR) in circular ring antenna [16], a dual-ring resonator loaded wide-slot fork-like monopole antenna [17], a bow-tie antenna [18], a dual U-shaped strips monopole antenna [19], a pair of edge resonators loaded bevelled square monopole antenna [20], a claw-shaped monopole antenna with modified ground plane [21], three λ g /4 length of inverted L-shaped strips loaded antenna [22], an asymmetric split-ring resonator patch antenna [23], a crooked U-shaped and three straight strips loaded S-shaped strip rectangular ring antenna [24], fork-shaped strip width with modified ring and a rectangular defected ground structure (DGS) antenna [25], a λ g /4 length of inverted L-shaped stubs and integrated horizontally T-shaped stub monopole antenna [26], and a slotted bowtie antenna [27] are demonstrated. However, these slot and monopole multiband antennas have a large volume for the limited space of wireless terminals.…”