A symmetrical microstrip gap can be modeled by two open ends with a capacitive series coupling between the two ends. The physical layout is shown in fig. 11.6.

The equivalent -network of a microstrip gap is shown in figure 11.7. The values of the components are according to [37] and [30].

(11.193) |

(11.194) | ||

(11.195) |

with

(11.196) | ||

(11.197) | ||

(11.198) | ||

(11.199) | ||

(11.200) |

with and being the open end capacitances of a microstrip line (see eq. (11.192)). The numerical error of the capacitive admittances is less than mS for

The Y-parameters for the given equivalent small signal circuit can be written as stated in eq. (11.201) and are easy to convert to scattering parameters.

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