Abstract: A conductor line is formed on the upper side of a dielectric plate, and a ground electrode is formed on the underside. Further, electrode non-formation portions are distributed at intervals a in the propagation direction of a signal and at intervals b in the perpendicular direction to the propagation direction. A band-stop or low-pass filter characteristic is produced by increasing the transmission loss in a frequency band determined by the intervals a, and the attenuation in the stop-band is determined by the intervals b in the width direction.

Abstract: A coplanar resonator comprising first center electrodes each having open ends and a ground electrode which extends along either side thereof is formed on the upper plane of a dielectric substrate, and second center electrodes and a perimeter electrode are formed on the lower plane of the dielectric substrate, so as to face the above center electrodes and ground electrode. A filter, duplexer, and communication device using this resonator are provided, thereby reducing the size of the resonator part formed of electrode patterns on a dielectric substrate, facilitating reduction in size of the overall device, and increasing no-load Q.

Abstract: Resonator electrodes are provided on the upper face of a dielectric substrate. The ratios (W1/L1) and (W3/L3) of the electrode widths W1 and W3 to the electrode lengths L1 and L3 of the resonator electrodes of the first and last stages are set at substantially 1.05<W/L<1.95. Lead-out electrodes are connected to the resonator electrodes of the first and last stages on the opposite sides of the center axis which is a straight-line axis passing through the center positions of the resonator electrodes of the first and last stages. Thereby, an attenuation pole is generated on the lower band side of the pass-band.

Abstract: A flat group-delay low-pass filter includes a series element connected between an input terminal and an output terminal, and a shunt element with one end thereof grounded. Inductors define the series element, a parallel circuit including a capacitor and a series circuit including a resistor and a capacitor defines the shunt element. The flat group-delay low-pass filter thus eliminates the need for inserting a fixed attenuator to control the effect of reflections due to impedance mismatching between the filter and other components. The resulting flat group-delay low-pass filter and an optical signal receiver including the filter have very low manufacturing costs and component costs.

Abstract: A lumped filter includes an input terminal, an output terminal, and a ground electrode disposed on a dielectric film on an alumina substrate. A first spiral inductor is connected between the input terminal and the ground electrode. A second spiral inductor is connected between the output terminal and the ground electrode. MIM capacitors are inserted between the input terminal and the first spiral inductor, and between the output terminal and the second spiral inductor. A third spiral inductor is inserted between the first and second spiral inductors. The spiral inductors have self-inductance, and capacitance between the spiral inductors and the electrodes adjacent thereto, by which the spiral inductors self-resonate and define as parallel LC resonators.

Abstract: Resonator electrodes are provided on the upper face of a dielectric substrate. The ratios (W1/L1) and (W3/L3) of the electrode widths W1 and W3 to the electrode lengths L1 and L3 of the resonator electrodes of the first and last stages are set at substantially 1.05<W/L<1.95. Lead-out electrodes are connected to the resonator electrodes of the first and last stages on the opposite sides of the center axis which is a straight-line axis passing through the center positions of the resonator electrodes of the first and last stages. Thereby, an attenuation pole is generated on the lower band side of the pass-band.

Abstract: A dielectric filter having a dielectric body made of dielectric material and having an outer surface including first and second end faces; an external conductor disposed on the outer surface of the dielectric body; at least one hole extending through the dielectric body between the two end faces, the at least one hole having a respective inner surface; the at least one hole having a pair of internal conductors respectively provided in the corresponding hole and conductively connected to the external conductor at respective ends of the corresponding hole, a respective non-conductive portion at the inner surface of the corresponding hole being spaced from both ends of the respective hole and thereby separating the corresponding pair of internal conductors and defining a capacitance between the corresponding pair of internal conductors; the first end face of said dielectric body being closer to the non-conductive portion at the inner surface of the corresponding hole than the second end face; the first end face

Abstract: Grooves are formed on the connection faces of the dielectric basic plates as a dielectric resonator, and also, an internal conductor is provided on the inside face, and coupling electrodes are formed on the other dielectric basic plate. These three dielectric basic plates are connected so that the coupling electrode effects capacity connection between internal conductors and the coupling electrode effects capacity connection between the internal conductors, whereby an earth electrode (external conductor) can be formed on almost full face on the reverse face side of the dielectric basic plate and the reduction of Qo of the resonator and the electromagnetic field leakage can be prevented.

Abstract: A dielectric filter, having a dielectric block with an outer surface including first and second end surfaces and a side surface extending between the first and second end surfaces; an external conductor disposed on the outer surface of the dielectric block, the external conductor substantially completely covering the outer surface; at least one hole extending through the dielectric body between the first and second end surfaces, the at least one hole having an inner surface; the at least one hole having a respective pair of internal conductors disposed on the corresponding inner surface thereof and conductively connected to the external conductor respectively at the first and second end surfaces, a respective non-conductive portion at the corresponding inner surface being spaced from both of the end surfaces and thereby separating the corresponding pair of internal conductors and defining a respective capacitance between the corresponding pair of internal conductors; a predetermined portion of the side surfac

Abstract: The invention provides a high frequency filter which can facilitate filter-characteristic adjustments and miniaturization and can obtain an excellent broadband characteristic. In addition, the invention provides a filter device using the high frequency filter, and an electronic apparatus incorporating the same. In this filter, a ground electrode is arranged on one of the main surfaces of a dielectric substrate. On the other main surface thereof there are arranged two or more microstrip lines, and one end of each microstrip line is grounded via a through-hole to form a high frequency filter. The microstrip lines and the shared through-hole constitute microstrip line resonators, which are coupled via the inductance of the through-hole. With this arrangement, there is no need for an additional coupling element. Thus, the size of the high frequency filter can be reduced. Furthermore, since a large coupling coefficient can be obtained, the high frequency filter can have a broadband characteristic.

Abstract: A dielectric filter, having a dielectric block with an outer surface including first and second end surfaces and a side surface extending between the first and second end surfaces; an external conductor disposed on the outer surface of the dielectric block, the external conductor substantially completely covering the outer surface; at least one hole extending through the dielectric body between the first and second end surfaces, the at least one hole having an inner surface; the at least one hole having a respective pair of internal conductors disposed on its corresponding inner surface and conductively connected to the external conductor respectively at the first and second end surfaces, a respective non-conductive portion at the corresponding inner surface being spaced from both of the end surfaces and thereby separating the corresponding pair of internal conductors and defining a respective capacitance between the corresponding pair of internal conductors; a predetermined portion of one of the first and se

Abstract: A method is disclosed which allows the electrical characteristics of a microstrip line filter or the like to be reliably measured using a two-dimensional measuring jig, even if components thereof to be measured are small in size and are not discrete components. A first ground electrode is formed substantially over the entire bottom surface of a dielectric substrate, and resonator electrodes are disposed on the top surface of the dielectric substrate. Input/output electrodes are each connected to a first-stage resonator electrode and a last-stage resonator electrode. Second ground electrodes conductively connected to the first ground electrode are disposed beside each of the input/output electrodes. By this structure, each of the input/output portions is provided with a grounded coplanar guide configuration.

Abstract: A method of adjusting characteristics of a dielectric filter including the following steps: forming a dielectric filter having a dielectric body, the dielectric body having an outer surface; forming an external conductor on the outer surface of the dielectric body; and forming at least one hole extending through the dielectric body, the at least one hole having a respective inner surface, and a respective internal conductor and a respective non-conductive portion at the inner surface; the outer surface of the dielectric body comprising first and second end surfaces and a side surface extending between the first and second end surfaces; the at least one hole extending through the dielectric body between the first and second end surfaces; the respective inner conductor being formed as a respective pair of internal conductors conductively connected to the external conductor at respective ends of the at least one hole, the respective non-conductive portion at the inner surface of the at least one hole being space

Abstract: The present invention provides a coplanar line filter or a duplexer, comprising: a dielectric substrate; a plurality of &lgr;/4 coplanar resonators provided on said dielectric substrate, said plurality of &lgr;/4 coplanar resonators comprising; a first center conductor having electrical length corresponding to a quarter wavelength; and a ground conductor provided with a gap from said first center conductor; a capacitive coupling portion comprising a gap provided between said first center conductors of a pair of said &lgr;/4 coplanar resonators; and a inductive coupling portion, comprising a guide conductor which electrically connects said first center conductor and ground, provided at a joint portion of a pair of said &lgr;/4 coplanar resonators; said plurality of &lgr;/4 coplanar resonators being connected in series with said capacitive coupling portion and said inductive coupling portion provided alternately.

Abstract: A coplanar resonator comprising first center electrodes each having open ends and a ground electrode which extends along either side thereof is formed on the upper plane of a dielectric substrate, and second center electrodes and a perimeter electrode are formed on the lower plane of the dielectric substrate, so as to face the above center electrodes and ground electrode. A filter, duplexer, and communication device using this resonator are provided, thereby reducing the size of the resonator part formed of electrode patterns on a dielectric substrate, facilitating reduction in size of the overall device, and increasing no-load Q.

Abstract: A dielectric filter (10, 20) is provided with resonator holes 11a and 11b, and the resonator holes 11a and 11b have large-sectional area portions 12a and 12b and small-sectional area portions 13a and 13b, respectively. On the step portions 14a and 14b between the large-sectional area portions 12a and 12b and the small-sectional area portions 13a and 13b, grooves 15a and 15b or protruding portions 16a and 16b substantially surround the small-sectional area portions 13a and 13b, respectively. Inner conductors 23a and 23b formed on the inner surfaces of the resonator holes 11a and 11b are directly connected to input and output electrodes 22a and 22b formed on outer surfaces of a dielectric block 1.

Abstract: The present invention provides a coplanar line filter or a duplexer, comprising: a dielectric substrate; a plurality of .lambda./4 coplanar resonators provided on said dielectric substrate, said plurality of .lambda./4 coplanar resonators comprising; a first center conductor having electrical length corresponding to a quarter wavelength; and a ground conductor provided with a gap from said first center conductor; a capacitive coupling portion comprising ai gap provided between said first center conductors of a pair of said .lambda./4 coplanar resonators; and a inductive coupling portion, comprising a guide conductor which electrically connects said first center conductor and ground, provided at a joint portion of a pair of said .lambda./4 coplanar resonators; said plurality of .lambda./4 coplanar resonators being connected in series with said capacitive coupling portion and said inductive coupling portion provided alternately.

Abstract: A method of adjusting characteristics of a dielectric filter having integral electromagnetic shielding, the dielectric filter comprises a dielectric body having an outer surface including first and second end surfaces and side surfaces extending between the first and second end surfaces; an external conductor disposed on the outer surface of the dielectric body and providing integral electromagnetic shielding of the dielectric filter; at least one hole extending through the dielectric body between the first and second end surfaces; a respective pair of internal conductors provided in the at least one hole and conductively connected to the external conductor at respective ends of the hole, a respective non-conductive portion in the hole being spaced from both ends and thereby separating the pair of internal conductors and defining a respective capacitance between the pair of internal conductors; and signal input and output electrodes provided on the outer surface of the dielectric body and electrically isolate

Abstract: Grooves are formed on the connection faces of the dielectric basic plates as a dielectric resonator, and also, an internal conductor is provided on the inside face, and coupling electrodes are formed on the other dielectric basic plate. These three dielectric basic plates are connected so that the coupling electrode effects capacity connection between internal conductors and the coupling electrode effects capacity connection between the internal conductors whereby an earth electrode (external conductor) can be formed on almost full face on the reverse face side of the dielectric basic plate and the reduction of Qo of the resonator and the electromagnetic field leakage can be prevented.

Abstract: A dielectric filter is formed by a plurality of resonator holes which are formed in a single dielectric block in such a manner that they extend in a direction between an open-circuited end surface and a short-circuited end surface of the dielectric block. The resonator holes are opened only at the short-circuited end surface. An inner conductor is formed on an inner surface of each of the resonator holes. An outer conductor is formed on an outer surface of the dielectric block. Capacitor electrodes respectively corresponding to the resonator holes are formed on the open-circuited end surface of the dielectric block. Input/output electrodes electrically connected to the capacitor electrodes are formed in such a manner that they extend on both the open-circuited end surface and a bottom surface of the dielectric block.