Contactless Characterization of Coplanar Stripline Discontinuities by RCS Measurement

Abstract

The article presents a contactless approach to characterize coplanar stripline discontinuities based on a radar cross-section (RCS) measurement method. With this approach, the values of the equivalent lumped element models are determined for two discontinuities often encountered in practice: open-circuit and short-circuit. The discontinuities are incorporated into two different very simple resonators. But contrarily to what is usually done, here the resonators are considered as radar resonant targets and are illuminated by a plane wave. The incremental electrical length due to the discontinuities causes a shift of the resonance frequency which is used for the extraction of the parameters. The values obtained from full-wave simulations are compared to measurements and to other data available from previous studies.

Compact Multi Bit Slotted C-Scatterer for Threshold Sensitive Chipless Wireless Temperature Sensor

“…This can be explained through tolerance analysis of the resonance frequency in ISM 5.8 GHz, taking into account the effect of substrate thickness variation on the effective permittivity. Using the coplanar strip line (CPS) model [16,17], the percentage of deviation in the resonance frequency can be evaluated by applying the analysis as follows:…”

“…δε is the tolerance of the effective permittivity due to fabrication which is composed of δε tolerance , given in the datasheet of Duroid6010.2LM substrate (δε tolerance = ±0.25). δε h is the uncertainty in the permittivity due to the variation of the substrate height, given by [17] δε r = ∂ε ∂h δh (6) where δh is the uncertainty in substrate height due to fabrication tolerance of the Printed Circuit Board (PCB) milling machine and ∂ε/∂h is the variation of the permittivity due to the variation of substrate height, which is calculated at the nominal value of substrate height of 1.27 mm. The surface imperfection is due to over etching of the surface around the slots and it is estimated from the fabricated structure to be δh = 0.15 mm.…”

Contactless Characterization of Metals’ Thermal Expansion Coefficient by a Free-Space RF Measurement

“…3. When a loop is illuminated by an incoming electromagnetic-field, the maximum energy back-scattered at a temperature T1 occurs at its resonant frequency f1 defined by [22]:…”

Authentication Using Metallic Inkjet-Printed Chipless RFID Tags

“…A C-folded scatterer is a coplanar stripline (CPS) [19]. Transmission line analysis of such a C-folded scatterer has been discussed in [20]. For chipless authentication, the potential of conventional C-folded scatterer [see Fig.…”

“…2(a)] based chipless tags using PCB technology has been discussed in [9]- [12]. The frequency of resonance f r of such CPS C-folded scatterer based chipless tags is expressed as [20]:…”