| 摘要 |
A switchable integrated electronic device includes at least three elements r1 . . . r14, s1 . . . s14 series coupled in a chain between a first port and a second port and includes a node between successive elements r1 . . . r14, s1 . . . s14 of the chain. There is a switch means for coupling a selectable one of the nodes to a third port. If successive elements r1 . . . r14, s1 . . . s14 in the chain are denoted ri, i=1 to N, and if adjacent positions occupied by the elements are numbered consecutively 1 to N, then element ri occupies position ⌊ N + 1 2 ⌋ + ( - 1 ) i · 2 · ⌊ i 2 ⌋ ⁢ ⁢ ⁢ for ⁢ ⁢ i = 1 ⁢ ⁢ to ⁢ ⁢ ⌊ N 2 ⌋ and position ⌊ N + 1 2 ⌋ + ( - 1 ) i · ( 2 · ⌊ N - i 2 ⌋ + 1 ) ⁢ ⁢ for ⁢ ⁢ i = ⌊ N 2 ⌋ + 1 ⁢ ⁢ to ⁢ ⁢ N .
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