RF Path 與 Smith Charts 使用情況與統計

RF Path provides propagation loss calculations for radio frequencies (RF) between 20 MHz and 20 GHz using either the Irregular Terrain model, Okumura-Hata model, COST-231 Hata Extension model, or the COST-231 Walfish-Ikegami model. The calculations are based on both electromagnetic theory and the statistical analysis of terrain characteristics to calculate the degradation of the RF wave as a function of distance and the variability of the RF wave with respect to time and space. The Irregular Terrain Model has two different prediction models. One is the Area Prediction mode which calculates propagation losses over an area where the exact terrain parameters are not known, but approximated using terrain roughness, environmental parameters and statistical parameters. The second is a point-to-point mode where specific latitude/longitude pair values are entered for both transmitter and receiver. Environmental parameters and statistical parameters are also used in this prediction mode. The results may be saved to iCloud, emailed, or posted to Facebook or Twitter. The results are in CSV format. In the Area Prediction mode a table along with a graph shows the path loss over the distance entered into the settings. The graph is viewed by rotating the device once the results table is shown. In the Point-To-Point Prediction mode a table along with a graph shows the path loss and elevation profile of the RF path.

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Smith Charts

A great experience of the Smith chart. Also in dark mode. With hand circles, ruler and point reader this chart can easily replace a physical one, making its use much faster. Functionalities: - Works on iPhone and iPad. - Drag and zoom in the chart. - Create multiple Smith Charts and name them. - Switch easily between input and output plane. - Use a ruler and drag it with the finger or Apple Pencil to obtain the wavelength toward generator of a point on the chart, instantly. - Tap the chart with the finger or Apple Pencil to show the coordinates in algebraic notation, then tap on the pointer button to show magnitude and phase of that location, and the corresponding impedance. - Insert circles by hand; modify the radius dragging a circle to keep the center in place, or press to translate them and modify the radius keeping the opposite side in place. Then use the padlock button to disable interaction of gestures with circles. Advanced tools for engineering: - Insert: scattering parameters, specifications (Ga, Gp, Gt, NF), noise data (gamma s optimum noise, minimum NF, rn) and the input/output reflection coefficients. - You will see the results appear on the chart while you are inserting data. - Results representable on the smith chart: input/output stability circles, equiGa, Gp, Gt, NF circles, reflection coefficients towards load and source and optimum power coefficients. - Other results: obtained results (Ga, Gp, Gt, NF) and stability results (D, K, kind of stability). - You can also insert a custom circle and a segment in the input and in the output plane, defining its center and radius in a textfield. - Choose the color and if to show or not every result. - Choose if to show or not the label of every result.