Low‐profile dual‐band antenna with on‐demand beam switching capabilities

Abstract

In this study, a dual‐band pattern‐reconfigurable monopole antenna is designed and experimentally validated for C‐band satellite communication systems and sensing UWB‐radar applications. The proposed antenna has three resonances at 3, 7 and, 8.5 GHz. To incorporate the reconfigurability, two switches are applied in the ground plane to reshape the radiation pattern and focus the radiated power in the desired direction. Thus, the desired beam from the antenna can be obtained by adjusting the states of the switches. The proposed antenna has good impedance matching (S11<−10thinmathspacedB for both operating bands), reasonable gain (>4.1 dBi), and high efficiency (>83%) for all switching states. A good agreement is observed between the simulated and measured results.

Gain Enhancement of Dielectric Resonator Antenna Using Electromagnetic Bandgap Structure

“…This is because the magnetic dipole of the slot is tending them to orient in the same direction. It is well-known that electric fields are always perpendicular to the magnetic fields [26][27][28]. The same phenomenon is also found in this design.…”

Liquid crystal‐based beam switchable three‐element microstrip parasitic array

“… a Literature [6] operates at dual‐band of 3 and 7 GHz. At 3 GHz, the switching range is −120°, 130° and 180°.…”

“…Radiation pattern reconfigurable antennas have attracted considerable attention in wireless communication systems due to enhancing performances of the coverage and channel capacity [1, 2]. There have been many techniques to realise the beam switching, such as PIN diodes [3–6], varactors [7, 8], microelectromechanical system (MEMS) structures [9] and tunable materials [10, 11]. In these works [3–8], semiconductor devices (PIN diodes or varactor diodes) are loaded on the parasitic elements.…”

Biotelemetry and Wireless Powering of Biomedical Implants Using a Rectifier Integrated Self-Diplexing Implantable Antenna

“…In fact, the slots on the patches elongated the current paths, resulting in antenna resonances at 935 and 1500 MHz (with adequate matching), respectively. The radiating slots induce an additional capacitance effect; thus, the resonant frequency shifted to the lower frequencies [31]. The impact of the additional capacitance on the resonant frequency of the antennas can be understood based on the slow wave phenomenon [32].…”