Dual‐band circularly polarized hybrid antenna for WLAN/WiMAX applications

Abstract

In this article, a dual‐band circularly polarized hybrid antenna is examined and discussed. In this composition, the diagonally trimmed square shaped slot (modified slot) acts as a radiator and the feeding network of CDRA. Modified slot has been adopted to excite the orthogonal modes ( HE11δx and HE11δy) in CDRA, which is responsible for the origination of circularly polarized (CP) waves in lower frequency band (2.68–3.04 GHz). Furthermore, a combination of V‐shaped microstrip line with modified slot is utilized to generate CP waves in upper frequency band (5.12–5.34 GHz). The sense of polarization can be altered by taking mirror image of the modified slot. To verify the simulated outcomes, the archetype of proposed design is fabricated and tested. Experimental results show good settlement with simulated results. The proposed radiator operates over two frequency bands, i.e. 2.36–3.22 GHz and 5.0–5.34 GHz with the fractional bandwidth of 30.82 and 6.57%, respectively. Measured 3‐dB axial ratio bandwidth is ∼12.20 and 4.2% in lower and upper frequency band, respectively. The proposed antenna structure is quite appropriate for WLAN (2.4/5.2 GHz) and WiMAX (2.5 GHz) applications.

Wideband circularly polarized square dielectric resonator antenna for WLAN/WiMAX applications

“…The truncation increases the impedance bandwidth, but some part of the |S 11 | response between the two resonant peaks reaches above the −10‐dB point. In this case, the notch is truncated from the rectangular patch to create a path delay of λ /4 for generating the 90° phase difference between the x ‐ and y ‐polarized electric field components within the square DRA for enhancing the axial ratio bandwidth . Therefore, in antenna 2, axial ratio bandwidth increases from 26.66% to 48%.…”

“…The truncation of the rectangular patch generates the 90° phase difference between the two orthogonal linearly polarized electric field components inside the square DRA for CP operation. Therefore, a λ /4 path delay is created for generating the 90° phase difference between the x‐ and y‐polarized electric field components in the square DRA due to that CP bandwidth enhances significantly . The maximum AR bandwidth is achieved in the case of d = 3.25 mm.…”

Tri-band and quad-band dual L-slot coupled circularly polarized dielectric resonator antennas

“…The proposed slot originates CP waves in lower frequency band (2.68–3.04 GHz). A combination of V‐shaped strip line with the proposed slot generates CP waves in upper frequency band (5.12–5.34 GHz) . Another dual‐band CDRA with dual polarization is proposed with inverted pentagon shaped aperture to launch two HEM 11δ and HEM 12δ hybrid modes.…”

Method of mode decomposition based on virtual ports for circularly polarized micro‐strip antenna

“…When compared with many other antennas, circularly polarized (CP) micro‐strip antenna holds many advantages . It is widely used in Global Position System (GPS), mobile satellite communication, Radio Frequency Identification (RFID), and so on . Traditionally, design of a CP micro‐strip antenna is mainly concentrated on selecting proper radiation patch structure, finding 2 orthogonal modes, and choosing optimal position to excite the orthogonal modes.…”