Dual‐band dual‐sense circularly polarized antenna based on crossed dipole structure for WLAN/WiMAX applications

Abstract

This paper presents a new approach to design dual‐band antenna with dual‐sense circularly polarized (CP) operation. A principle for CP radiation is the use of two orthogonal dipoles and properly choosing their lengths can produce either right‐hand CP (RHCP) or left‐hand CP (LHCP) operation. In the proposed structure, the lower frequency band at 2.4 GHz is designed with RHCP radiation and LHCP is the operating mode of the higher band at 3.5 GHz. For verification, an antenna prototype is fabricated and measured. Measured data indicate that good performances over the RHCP and LHCP bands can be obtained with usable bandwidths of 2.9% (2.36‐2.43 GHz) and 1.7% (3.48‐3.54 GHz). Along with this, it also observes good unidirectional radiation patterns and the measured broadside gains are around 7.7 and 7.4 dBic across these frequency ranges.

Dynamically Switched Dual-Band Dual-Polarized Dual-Sense Low-Profile Compact Slot Circularly Polarized Antenna Assisted With High Gain Reflector for Sub-6 GHZ and X-Band Applications

“…A cross dipole structure CP antenna with dual-band dual-sense characteristics is achieved in [9] for WLAN/Wi-MAX applications with dual band gains of 7.7/7.4 dBi. In [10], a dual-band dual-polarized antenna with less radiating layers, only one layer radiating patch, is achieved with a dual band gains of 6.8/7.1 dBi. Integrating an SIW cavity in a bow-tie slot antenna dual band gains of 6.1/5.4 dBi with dual-band dual-polarized characteristics is achieved in [11].…”

Dual‐band circularly polarized crossed‐dipole antenna with double split‐ring resonators and a defected ground structure

“…A much simpler approach is proposed in 13 to design a dual‐band CP antenna. However, the performance is not satisfied with the wideband wireless commutation system.…”

Fully Metallic Dual-Band 3-D Wire Antenna for Wi-Fi and Wi-Max Applications

“…The ME dipole design is very efficient; however, its bulky profile (0.98λ 0 × 0.98λ 0 × 0.30λ 0 ) makes it only suitable for applications where size and volume are not a constraint. Finally, in [19], a crossed dipole structure is employed to achieve dual-band CP properties (2.5 and 3.5 GHz). The cited works above employ dielectrics substrates which reduce the radiation efficiency.…”

“…The cited works above employ dielectrics substrates which reduce the radiation efficiency. They have narrow bandwidths impedance at −10 dB, and the highest values are 21.2% and 9.8% for the [19] case and a −3 dB axial ratio bandwidth (ARBW), < 4.2% in [15]. The MS dipole [18] is the exception with high efficiency and relatively large ARBW (29.1% and 13.1%), but it occupies a much higher volume.…”