Delay line

• US 7,990,231 B2
• Filed: 03/10/2006
• Issued: 08/02/2011
• Est. Priority Date: 03/10/2005
• Status: Active Grant

• Current Assignee: Soshin Electric Company Limited (Walsin Technology Corporation)
• Original Assignee: Soshin Electric Company Limited (Walsin Technology Corporation)
• Inventors: Katsumata, Itsuaki, Morikaku, Hiroyuki
• Primary Examiner(s): Pascal; Robert
• Assistant Examiner(s): Wong; Alan
• Application Number:
  US11/815,815
• Publication Number:
  US 20090051465A1
• Time in Patent Office: 1,971 Days
• Field of Search: 333/139, 333/140, 333/175, 333/138, 333/204
• US Class Current: 333/175
• CPC Class Codes: H01P 9/00 Delay lines of the waveguide type

Abstract

In a band-pass filter of a delay line, an input terminal and a first resonator adjacent to the input terminal are coupled through a capacitor. The first resonator and a second resonator adjacent to the first resonator are coupled through a capacitor. The second resonator and a third resonator adjacent to the second resonator are coupled through an inductance. The third resonator and a fourth resonator adjacent to the third resonator are coupled through a capacitor. The fourth resonator and an output terminal adjacent to the fourth resonator are coupled through a capacitor.

Claims

1. A delay line including a bandpass filter which has a plurality of resonators between an input terminal and an output terminal, wherein

said input terminal and one of said resonators which is adjacent to said input terminal are connected to each other by a capacitive coupling or an inductive-coupling;

said output terminal and one of said resonators which is adjacent to said output terminal are connected to each other by a capacitive coupling or an inductive-coupling;

at least one pair of adjacent resonators of said resonators are connected to each other by a capacitive coupling and an inductive-coupling in series;

and

said delay line further comprising at least one additional circuit connecting two of said plurality of resonators across at least one resonator of said plurality of resonators, by a composite coupling configuration including at least one capacitive coupling and at least one inductive coupling that are connected in series with each other.

2. A delay line according to claim 1, wherein each of said plurality of resonators comprises one of a λ

/4 resonator, a λ

/2 resonator, and an LC resonance circuit.