主权项 |
1. A tunable band-pass circuit comprising:
a first tuning section comprising:
a first inductor in series with a first tunable capacitor, the first tunable capacitor being further connected to ground; a second tuning section comprising:
a second inductor, a first phase shifter, and a second tunable capacitor in a series configuration, with the second tunable capacitor being further connected to ground;a third inductor connected in parallel across the second inductor and first phase shifter;a first fixed capacitor positioned between the second inductor and the third inductor; and a third tuning section comprising
a fourth inductor and a second fixed capacitor in a series configuration forming a first series LC circuit;a fifth inductor and a third fixed capacitor in a series configuration forming a second series LC circuit;a sixth inductor in series with a third tunable capacitor forming a third series LC circuit, a first terminal end of the third series LC circuit connected to a common junction of the first and second series LC circuits, and a second terminal end of the third series LC circuit being connected to ground;a fourth fixed capacitor positioned between the first series LC circuit and the second series LC circuit; the first, second, and third tuning sections being connected in series between a first port and a second port to form a band-pass frequency response; wherein each of the first through third tunable capacitors is configured for variable tuning for changing the frequency response of the circuit. |