A compact stepped-impedance dipole antenna with harmonic suppression is presented. The antenna occupies an overall size of 40 × 12 × 1.6 mm 3 when being printed on a substrate with a relative dielectric constant of 4.4 and loss tangent 0.02. The simulation and experiments are well matched and offer a 2 : 1 V SW R (S11 < −10 dB) bandwidth of 590 MHz at 2.45 GHz. In comparison with a conventional strip dipole, the stepped impedance based dipole antenna shows complete suppression of the first and second harmonics making it suitable as an efficient EMI emission free antenna for widely used Bluetooth and WLAN applications. It can also be employed for wireless power transfer applications with more efficiency.
The article presents an asymmetric single split resonator (ASSR) unit cell, its resonant properties, and an electrically small microwave sensor employing the complementary asymmetric single split resonator (CASSR) structure with high quality factor (Q) on the FR4 substrate. The structure is compared with the conventional symmetric split ring resonator. The CASSR sensor designed and fabricated on a substrate of dielectric constant 4.4 and a thickness 1.6 mm has an electrically small size of 0.127λ 0 × 0.127λ 0 × 0.007λ 0 at 1.27 GHz, which yields ka = 0.56 < 1 with low radiation efficiency. The properties and performance of the proposed CASSR for extracting the permittivity of both solid and liquid samples using amplitude and phase sensing in a simple lab-in-touch approach are validated with full-wave simulations and experimental results.
This paper presents the characteristic mode analysis of the harmonic suppressed stepped impedance strip dipole antenna. The proposed antenna is resonating at 2.4 GHz with the excellent suppression of higher harmonics. Characteristic mode analysis is effectively utilized to identify the radiating modes of the antenna. The prototype has been designed and fabricated on a single‐sided FR4 substrate of dielectric constant 4.4 and loss tangent 0.025. The antenna has an overall dimension of 0.36 λ0 × 0.096 λ0 × 0.0128 λ0, and the prototype is experimentally studied and validated with simulations. The impedance bandwidth of the antenna is from 2.18 to 2.77 GHz (24.58%), which covers WiMAX (2.5‐2.7 GHz), WLAN (2.4‐2.48 GHz), Bluetooth (2.4‐2.48 GHz), and LTE (2.18‐2.69 GHz). The measured peak gain and peak efficiency of the antenna are 1.75 dBi and 95%, respectively.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.