![]() Enter Load and Characteristic impedances to calculate VSWR and Reflection Coeffecients. ![]() You can toggle between Impedance and Admittance charts. In practice, stub spacings are usually chosen as λ/8 or 3λ/8. click anwhere inside the chart to see the corresponding circles. If the load admittance is located inside the shaded area (forbidden area), it simply cannot be matched by the doublestub tuning. And y 1 (or y 1 ’ ) rotates to y 2 (or y 2 ’ ) Step 5: Design l 2 so that the susceptance is cancelled out and impedance is matched to the line (origin in the Smith Chart). ELEC344, Kevin Chen, HKUST 3 Step 4: the transmission line between l 1 and l 2 will rotate back to the original 1+jb circle. Step 2: Taking into account the effect of the transmission line d between two stubs - rotated 1+jb circle Step 3: Design l1 so that y L moves to y 1 (or y 1 ’ for solution 2). Step 1: Draw the normalized load impedance y L in the Smith Chart. ELEC344, Kevin Chen, HKUST 2 Smith Chart Solution for finding the matching parameters: d, l 1, and l 2. Shunt are easiest to implement in practice. ELEC344, Kevin Chen, HKUST 1 Double-stub tuning Original circuit with the load an arbitrary distance from the first stub Equivalent circuit with load at the first stub. The double-stub tuner uses two tuning stubs, partially removes the requirement for variable distance from the load, and is widely used in laboratory practice as a single frequency matching device.
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