Design of multi‐polarised quad‐band planar antenna with parasitic multistubs for multiband wireless communication

Abstract

A multi‐polarised quad‐band planar circular disc monopole antenna consisting of a parasitic double T‐stub and parasitic long and short inverted L‐stubs is presented. By loading parasitic multistubs along the y‐axis behind a circular patch, the antenna can yield four resonance modes at 2.5, 4.5, 5.7, and 7.7 GHz frequencies while keeping the size of 30 × 40 mm2. The proposed antenna has been fabricated and experimentally studied. The measured impedance bandwidths of 290 MHz (2.36–2.65 GHz), 540 MHz (4.28–4.82 GHz), 530 MHz (5.47–6.0 GHz), and 780 MHz (7.28–8.06 GHz), for Bluetooth, 2.4/5.8 GHz wireless local area network, 2.5/5.5 GHz worldwide interoperability for microwave access, 5.9 GHz intelligent transportation systems (ITS), downlink of Indian National Satellite System and X‐band satellite applications. The 3 dB axial ratio bandwidth is 280 MHz (5.79–6.07 GHz) for the 5.9 GHz ITS band. The antenna E‐field radiation has y‐directed (vertical linear) polarisation at first, second, third resonance bands and slant + 45° linear polarisation at the fourth resonance band. At the ITS band, the E‐field radiation has right‐handed circular polarisation. In addition, the design procedure, electrical model and effects of parasitic stub dimensions on the antenna characteristics are discussed.

Triband Compact Printed Antenna for 2.4/3.5/5 GHz WLAN/WiMAX Applications

“…A triangular-shaped strip was incorporated into the existing ground plane to realize the asymmetric trapezoid ground plane (the proposed antenna) to fine-tune impedance matching at the upper frequency band, i.e., 5.2, 5.5, and 5.8 GHz. [10] 40 × 30 × 0.79 2.4/5.8 2.5/5.5 [11] 50 × 50 × 1.6 2.1 3.5/5.5 [12] 35 × 45 × 1.5 2.4/5.8 2.3/3.5/5.5 [13] 80 × 65 × 0.78 2.4 2.5/3.5 [14] 40 × 40 × 0.764 5.8 3.5 [15] 30 × 20 × 0.8 2.45/5.7 3.5 [16] 50 × 45 × 1.6 2.4/5.8 3.5 [17] 59 × 31 × 0.1 2.4 3.5 [18] 45 × 50 × 1 2.4 3.5/5.5 [19] 70 × 44 × In the parametric study of the antenna, the dimensions of a folded open stub, long and short L-shaped strips, and asymmetric trapezoid ground plane were varied and the reflection coefficient (|S 11 |) was determined, as shown in Sections 3.2 and 3.3.…”

“…In [1][2][3][4][5], dual-band antennas covering 2.4/5.2/5.8 GHz bands were proposed for wireless local area network (WLAN) applications. In [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], attempts were made to develop antennas for WLAN/WiMAX applications, including π-shaped slotted microstrip antennas with aperture-coupled feed [6], resonator antennas [7][8][9], dual and multipolarized antennas [10][11][12], magnetoelectric and magnetic dipole antennas [13,14], frequency-reconfigurable antennas using PIN-diode switch [15][16][17][18], metamaterial antennas [19][20][21], antennas with inverted-L-shaped radiating elements and parasitic elements in the ground plane [22], antennas with pentagonal ring slot fed at the vertex and E-slip with backfeeding [23], and antenna with bow-tie slot in a single metal sheet on top of the flexible substrate [24]. However, these antennas fail to cover the entire WLAN frequency band (2.4/5.2/5.8 GHz).…”

Dual-Band Monopole Antenna for RFID Applications

“…Therefore, for ultra-high frequency designs, it is better to use materials prone to loss, such as Arlon, Roger, and others. Printed monopole antennas are very attractive and suitable for dual-band or multi-band applications owing to their simple structures, compact size, good impedance matching, and omnidirectional radiation patterns [13]. Multi-band monopole antennas can be realized by employing parasitic structures, slots, or slits in the antenna configuration or using various radiating elements with different shapes [14].…”

A Multiband Compact Low-Profile Planar Antenna Based on Multiple Resonant Stubs

“…With the wide and rapid development of modern wireless communication, antennas with multiband operation are greatly demanded in mobile wireless communication terminals. Recently, to satisfy the applications of WLAN standards (2.45/5.2/5.8 GHz) and WiMAX standards (2.8/3.8/5.5 GHz), various types of planar multiband antennas have been investigated due to their compactness, low-profile, lowcost, and convenient fabrication, such as parasitic antennas, fractal antennas, and slot antennas [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”