Broadband Determination of the Even- and Odd-Mode Propagation Constants of Coupled Lines Based on Two-Port Measurements

Parameters Characterization of Dielectric Materials Samples in Microwave and Millimeter-Wave Bands

“…Although these methods are (i) (j) not suitable for loss characterization, the proposed overestimation and the technique to select the most appropriate line lengths allow to obtain coherent results up to 40 GHz, where fluctuations of the attenuation constant limit the available frequency range of this method. However, this frequency range is quite wider and the obtained attenuation constant is more accurate than other in the state-of-the-art [11]. As it can be seen in Table I, HIPS has a low loss tangent, tan δ = 0.005, and a low relative permittivity, ε r = 2.45, if it is compared to the rest of substrates under test in this paper.…”

“…Several of these methods have been proposed for the characterization of printed materials [8], [9]. On the other hand, broadband methods [10], [11] provide continuous results within the whole frequency band, because they rely on the propagation of the transmission line modes. Nevertheless, their accuracy depends on the precision of the experiments and they show a worst behavior precisely at resonances.…”

Performance Evaluation of Broadband Characterization of Coupled Transmission Lines Even- and Odd-Mode Propagation Constants Using Differential and Common Mode S-Parameters

“…Their main drawback is that they only offer a solution in a limited number of frequencies, only at those frequencies where resonances occur. On the other hand, broadband methods [9], [10] allow estimating, ideally, a solution that covers the entire frequency sweep of the analyzer. Nevertheless, these works were limited to 20 GHz.…”

“…Nevertheless, these works were limited to 20 GHz. For example, in [10] a method based on reflection measurements is considered to take advantage of a destructive setup considering the invariance of the cross-ratio of four complex numbers to a bilinear transformation. However, for all broadband methods, their main inconvenience is the lack of accuracy when estimating the attenuation constant of low-loss transmission media.…”

Broadband Determination of the Propagation Constant of the Slot Mode of a Rectangular Waveguide

“…A consolidated method for measuring the propagation constant of the microstrip-line mode is the algorithm proposed by Bianco and Parodi several decades ago [11], [12]. Very recently, the authors used a modification of this method to propose a broadband determination of the propagation constants of the even and odd modes of coupled lines [13]. In this contribution, a measurement procedure of the propagation constant of the slot mode in a rectangular waveguide is presented.…”