Dual-Band Monopole Antenna With Frequency-Tunable Feature for WiMAX Applications

Abstract

A novel compact planar printed antenna is designed and analyzed for ultrawideband wireless applications. The proposed antenna is constructed by a circular patch with a circular split-ring slot gradually varying the width, a U-shaped slot, a small strip slot, and a segmental ground plane with three slits. To broaden the bandwidth and produce notches, three different type slots are incorporated in the antenna radiating patch, and multiple slits are embedded onto the defected ground plane. The simulated and measured results show that the antenna yields a wider bandwidth ranging from 2.9 to 13.0 GHz (the return loss less than 210 dB) with the three notched bands of 3.30-3.70 GHz (WiMAX band), 4.50-4.83 GHz (Receiving frequency for INSAT/Super-Extended C-band), and 6.67-7.15 GHz (Transmitting frequency for INSAT/Super-Extended C-band). Furthermore, the proposed antenna has achieved average peak gain of 5.50 dBi and stable quasiomnidirectional radiation patterns.

Reconfigurable antenna design for soil testing to improve soil quality

“…A tuneable Multiband Micro strip Antenna is designed, capable of turning its operating frequency in 5GHz band which has two slots of E & U shape are etched to achieve multiband resonance [6]. The antenna designed to produce the significant efficiency to have Wi-MAX application; the tri-band antenna structure and it will be generated from the ground planes from the three folded slots etched from the antenna design is described in [5][6][7][8][9]. In the proposed antenna, we designed a four-band slot antenna for the GPS/Wi-MAX/WLAN systems.…”

Frequency Reconfigurable Antenna Using Metasurface for Satellite Application

“…Electrically reconfigurable antennas, which are far more popular, can be classified into band switching and continuous tuning. Band switching can be achieved using PIN-diode switches and the operating frequency band is switched among different frequency bands, depending on the switching states [2]-Continuous tuning can be accomplished using varactor diodes and the antennas can be frequency tuned smoothly within the operating frequency bands [5]. In designing these antennas, direct-current (DC) biasing circuits are needed to bias the PIN or varactor diodes.…”

Band tuning of a waveguide antenna using a reflective metasurface

“…In the last few years, many techniques for frequency reconfigurable antennas have been proposed to reduce complexity of tuning structures or overcome tuning restrictions. These include PIN switching devices [1,2], variable capacitances [3,4], mechanically or micromechanically tunable devices [5,6], and electrically or magnetically tunable materials [7,8]. However, most reconfigurable antennas are suffering from narrow tunable ranges due to their resonant structures.…”

“…Large number of antennas with notched band characteristics has been proposed. The widely used methods are etching slots on radiating elements and/or on ground plane [2][3][4]. Introduction of parasitic strips near the radiating element or on ground plane is another way to create notch bands [5].…”