Metoda za određivanje uticaja DC struje na električne karakteristike SMD induktora

Prilikom proticanja DC (Direct Current) struje kroz induktor namenjen za površinsku montažu (SMD induktor), dolazi do namagnetisanja jezgra što dovodi do smanjivanja njegove induktivnosti i impedanse. Uočeno je da je ovo smanjivanje naročito izraženo kada vrednost DC struje koja protiče kroz induktor premašuje onu vrednost struje za koju proizvođač garantuje ispravan rad komponente. Zato je neophodno ispitati i predvideti stepen degradacije električnih karakteristika, kao i zavisnost gubitaka jezgra na promenu temperature tela testiranog induktora. Prikazana merna metoda predstavlja postupak ispitivanja uticaja DC struje na električne karakteristike induktora namenjenih za površinsku montažu. Analiza je bazirana na modelu induktora koji je prikazan kao dvokrajni model induktorske komponente. Za proračun električnih karakteristika induktora (induktivnost, otpornost, Q-faktor, realni i imaginarni deo impedanse) ekstrahovanih i izmerenih S-parametara primenom vektorskog analizatora mreže, korišćen je in-house softverski alat IndCalc

Spiral Inductor Fabricated by 3D Additive Manufacturing

This paper presents spiral inductor fabricated by 3D additive manufacturing. The inductor was made with conductive epoxy silver based paste which was injected in spiral channel fabricated in polylactide (PLA) substrate (model) using additive manufacturing technology. The fabricated structure has value of effective inductance around 415 nH, maximum quality factor around 12 and outer dimension diameter 24 mm. The prototype results show good characteristics of 3D additive manufactured spiral inductor and demonstrate an innovative approach to fabricate low-cost, passive devices such as an inductor

Fully 3D printed rolled capacitor based on conductive ABS composite electrodes

This paper presents a novel approach in the fabrication of rolled capacitors using a printable conductive ABS composite filament. On the contrary to conventional manufacturing of rolled capacitors, here a fused filament fabrication (FFF) technology, which allows a simpler and cheaper procedure of production is used. Also, a simple model of a 3D printed rolled capacitor is developed and the capacitance of the fabricated capacitor is calculated. The capacitance of the fabricated capacitor is measured in the frequency range from 100 Hz to 100 kHz. The measured capacitance is in good agreement with the calculated capacitance. It confirms the possibility of using conductive ABS composite filament for fabrication of 3D printed electrodes which could be formed passive device such as rolled capacitor or sensor for measuring liquid level

Design and Fabrication of Ferrite Inductor Using 3D Printed Spiral Coil and Ferrite Disc

In this paper, we present spiral inductor fabricated by 3D additive manufacturing (AM) with added ferrite disc in the middle of the inductor (center), first approach, and with added ferrite disc beneath the inductor, second approach. The inductor was made with conductive epoxy silver based paste which was injected in a spiral channel fabricated in polylactic acid (PLA) substrate (model) using AM technology. 3D model and obtained results present a connection between passive components production and additive manufacturing. The designed spiral inductor has four full turns, with inner diameter 10 mm and outer diameter 24 mm The total dimension of the component is 27 mm x 27 mm The prototype results show good characteristics and demonstrate an innovative approach to fabricate low-cost, passive devices such as an inductor

Application for fast determination of inductor's electrical characteristics from S-parameters

This paper presents an application "IndCalc" for calculation of surface-mounted devices (SMD) inductor parameters, extracted from measured S-parameters. It simplifies characterization and provides reliable procedure for determining SMD inductor's parameters in a wide frequency range up to several GHz. In order to present developed application and its validity, commercially available components in their printed circuit board (PCB) environment are measured using Agilent vector network analyzer E5071B

Investigation of Dielectric Properties of Printed Material for Capacitor Application

This paper investigates the dielectric characteristics of the material used to make capacitor in fused filament fabrication technology. The characteristics of the capacitor made of PLA (Polylactic Acid) as dielectric are examined. Using a 3D printer, dielectric samples are created in the form of a disk 8.6 mm in diameter. Preliminary samples revealed that the surfaces of the printed samples are rough, after which the mechanical treatment of the samples is applied. The thicknesses of the samples belbre and after polishing are 1 mm and 0.7 mm, respectively. Epoxy electrodes are applied to the dielectric disks on both surfaces to produce the parallel plate capacitors. The capacitance of the fabricated capacitors is measured in the low frequency range, from 0.1 Hz to 200 kHz. The dissipation characteristics of the capacitor are examined, and a measured average value of tangent loss is 0.007. The printed dielectric samples without the electrodes are used to investigate their ability to withstand voltages up to 6 kV. The measurement results confirmed that the used PLA material is suitable for the fabrication of he capacitor with good characteristics

Heterotube Mn-Zn Ferrite Bundle EMI Suppressor With Different Magnetic Coupling Configurations

Two types of heterotube ferrite bundle electromagnetic interference (EMI) suppressors were formed using Mn-Zn ferrite tubes with different inner and outer tube diameters. The suppressing principle based on magnetic coupling between the central tube and outer tubes in the bundle, e. g., primary half-turn to different short circuited secondary turns, was applied. Several different configurations, such as meander, frame, chain, cage, and short-circuited turns, were realized for both types of ferrite hetorotube bundle suppressors. They were characterized in the EMI frequency region (1-1000 MHz). The results obtained were compared mutually and with the standard half-turn wire configuration and other round core ferrite tube suppressors. Certain correlations were noticed between changes of characteristic parameter values, such as maximum of impedance Z(m), frequency of maximum impedance F-m, and suppressing range Delta f around F-m for all measured configurations. Possible applications as devices suitable for EMI suppressing were considered

Influence of different substrates' thickness on the performance of inkjet printed CPW inductors

In this paper, influence of different substrates' thickness on coplanar waveguide (CPW) inductors for high frequency applications is presented. The designed CPW inductors are two-port meanders with one turn and outer dimension 1.8 mm x 2.0 mm. CPW inductors were made in inkjet printing technology with nanoparticle ink which contain 20 wt% of silver. CPW inductors are fabricated on substrates with 25, 50, 75 and 125 m thicknesses. The measured response characteristics are in excellent agreement with the predicted simulation response. The best values of inductance and Q-factor were obtained with 125 mu m thickness of substrate (L=2.269 nH and Q congruent to 5)

Design of RFID antenna in ink-jet printing technology

In this paper design of 125 kHz RFID antenna is presented. The optimization and improvement of electrical characteristics, including inductance and Q-factor, is also discussed. Designed RFID antenna is part of the ID card, which has standard ISO ID1. It consists of two spiral coils in two layers. Comparison of antenna in flexible and PCB technology is presented. The aim of this work is to introduce novel cost-effective antenna in flexible technology instead of conventional RFID antenna in PCB technology