900 MHz and 2.45 GHz compact dual-band circularly-polarized patch antenna for RFID application

Abstract

A compact design of a circularly-polarized microstrip antenna in order to achieve dual-band behavior for Radio Frequency Identification (RFID) applications is presented, defected ground structure (DGS) technique is used to miniaturize and get a dual-band antenna, the entire size is 38x40x1.58 mm 3 . This antenna was designed to cover both ultra-height frequency (740MHz ~ 1GHz) and slow height frequency (2.35 GHz ~ 2.51GHz), return loss < -10 dB, the 3-dB axial ratio bandwidths are about 110 MHz at the lower band (900 MHz).

A triple‐band highly miniaturized antenna for WiMAX/WLAN applications

“…The etching of DGS on the ground plane of an antenna perturbs the current length path, as a result of which the effective capacitance and inductance changes, thereby resulting in antenna miniaturization. Several studies have reported the use of DGS to miniaturize the patch antenna . However, the antenna designed using DGS structure in this research outperforms the antenna studied in literature in terms of size, miniaturization achieved, complexity, and number of operating modes, as illustrated in Table .…”

“…Several studies have reported the use of DGS to miniaturize the patch antenna. [9][10][11][12][13][14] However, the antenna designed using DGS structure in this research outperforms the antenna studied in literature in terms of size, miniaturization achieved, complexity, and number of operating modes, as illustrated in Table 1.…”

“…Although, microstrip patch antenna being a popular choice for the aforementioned applications, difficulty arises in miniaturizing the patch antenna which includes, The resonant frequency is determined by the dominant mode of the patch activity, Difficulty in maintaining trade‐off between performance (ie, radiation characteristics and resonant mode operation) and size of the patch. Nevertheless, the literature reports several miniaturization techniques, such as, use of metamaterials (MTMs), high impedance surfaces (HIS), Magneto‐Dielectrics, reactive impedance surfaces (RIS), fractalization, loading shorting walls and pins, loading capacitors and inductors, defected ground structures (DGSs), and so forth.…”

Design and Fabrication of a Miniature and Compact Tri-band Antenna Using CTSRR Metamaterial and DGS Methods for RFID and WiMAX Applications

“…[7] Since different standards may be used simultaneously in one system, it has become a tendency to design an antenna that can operate at multiple frequency bands [8]. In the literature there are many techniques for miniaturization and adaptation such as, metamaterial (MTMs) [9,10], High impedance surface (HIS) [11], Magneto-Dielectrics [12], reactive impedance surfaces (RIS) [13], fractalization [14], defected ground structures (DGS) [15,16] and so forth. Metamaterials were first introduced by Veselago in 1967 [17], they are artificial Structures which exhibit negative permittivity, permeability and negative refractive index, which is not found in the readily available materials [18,19].…”