Dual-frequency matching circuit

Details Dual-frequency matching circuit Dual-frequency matching circuit

2009-01-12

2009-08-25

Jones, Stephen E (Department: 2817)

Wave transmission lines and networks

Coupling networks

With impedance matching

C333S126000

Reexamination Certificate

active

07579924

ABSTRACT:
The connection topology of input terminals (2), elements (4a, 4b, 4cand4d) and load (5) is designed similarly to a “seven-segment display” that is often used to display numerals on a calculator or a digital watch. Specifically, suppose in the three horizontally running segments of the seven-segment display, the top and bottom ones are associated with the input terminals (2) and the load (5) is allocated to the other horizontal one. Then, the other four vertical segments are associated with the elements (4a, 4b, 4cand4d), which may be an inductor with an inductance of 4.030 nH, an inductor with an inductance of 11.208 nH, an inductor with an inductance of 2.497 nH, and a capacitor with a capacitance of 2.233 pF, respectively. By adopting this circuit configuration, the total number of elements can be reduced to four and the loss can be reduced significantly. Since the resonant circuits can be eliminated and the size of the ladder circuit can be reduced, impedance matching is achieved with a high degree of stability in spite of a variation in the impedance of the load (5).

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