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.

Abstract: Disclosed is a filter comprising an unbalanced input terminal and two balanced output terminals (a first balanced output terminal and a second balanced output terminal. A capacitor is connected between the first balanced output terminal and the GND, another capacitor is connected between the second balanced output terminal and the GND, and a first coil is connected between the first balanced output terminal and the second balanced output terminal.

Abstract: Disclosed is a filter comprising an unbalanced input terminal and two balanced output terminals (a first balanced output terminal and a second balanced output terminal. A capacitor is connected between the first balanced output terminal and the GND, another capacitor is connected between the second balanced output terminal and the GND, and a first coil is connected between the first balanced output terminal and the second balanced output terminal.

Abstract: A filter is provided with one unbalanced input terminal, a first balanced output terminal and a second balanced output terminal. A primary coil is connected between a connecting point, which is of a second capacitor and a third capacitor, and GND. Furthermore, a secondary coil is connected between the first balanced output terminal and the second balanced output terminal, and the primary coil and the secondary coil are magnetically coupled.

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.

Abstract: A delay line having a first delay circuit and a second delay circuit. The first delay circuit consists of a band-pass delay line having a first input terminal and an output terminal and other delay lines. The second delay circuit has a hybrid coupler equipped with a second input terminal, a first output terminal, a second output terminal, and an isolation terminal, a first reactance section connected with the first output terminal, and a second reactance section connected with the second output terminal. Furthermore, the output terminal of the first delay circuit is electrically connected with the second input terminal of the hybrid coupler of the second delay circuit.