Abstract: A shared-antenna device having a transmission circuit electrically connected between a transmission terminal and an antenna terminal, and a reception circuit electrically connected between a reception terminal and the antenna terminal. The transmission circuit is a variable-frequency band-stop filter circuit and the reception circuit is a variable-frequency bandpass filter circuit. Control-voltage supplying resistors are connected to the PIN diodes such that the DC voltages for individually controlling the PIN diodes are applied to the PIN diodes via only the resistors.

Abstract: A dielectric filter includes a dielectric block having a plurality of outer surfaces including opposed top and bottom surfaces, opposed side surfaces and a mounting surface. A plurality of through holes extend between the opposed top and bottom surfaces. Respective internal electrodes are located on internal surfaces of the through holes and an outer conductor is formed on at least some of the outer surfaces. First input output electrode extends from the mounting surface to one of the side surfaces. A second input output electrode extends from the mounting surface to the other of the side surfaces. Each of the first and second input output electrodes are separated from the outer conductor by a respective conductor-free portion wherein at least one corner of an outer shape of each of the conductor-free portions is formed as a continuous line having no right angles.

Abstract: A shared-antenna device having a transmission circuit electrically connected between a transmission terminal and an antenna terminal, and a reception circuit electrically connected between a reception terminal and the antenna terminal. The transmission circuit is a variable-frequency band-stop filter circuit and the reception circuit is a variable-frequency bandpass filter circuit. Control-voltage supplying resistors are connected to the PIN diodes such that the DC voltages for individually controlling the PIN diodes are applied to the PIN diodes via only the resistors.

Abstract: A dielectric filter includes a dielectric block having a plurality of outer surfaces including opposed top and bottom surfaces, opposed side surfaces and a mounting surface. A plurality of through holes extend between the opposed top and bottom surfaces. Respective internal electrodes are located on internal surfaces of the through holes and an outer conductor is formed on at least some of the outer surfaces. First input output electrode extends from the mounting surface to one of the side surfaces. A second input output electrode extends from the mounting surface to the other of the side surfaces. Each of the first and second input output electrodes are separated from the outer conductor by a respective conductor-free portion wherein at least one corner of an outer shape of each of the conductor-free portions is formed as a continuous line having no right angles.