摘要:
A dielectric filter which has suitable attenuation characteristics and which readily exhibits desired characteristics. First, second and third inner-conductor holes having an inner conductor on each of the surfaces thereof are formed inside a dielectric block having an outer conductor on the outer surface thereof. First and second I/O electrodes extend from opposing side-surfaces to the undersurface of the dielectric block and are separated from the outer conductor. The side-surfaces are orthogonal to the direction in which the inner-conductor holes are arrayed in the dielectric block, and the undersurface is a mounting surface for facing a mounting board. The first I/O electrode extends from one of said side-surfaces near the first inner-conductor hole, to a position beyond a remote side of the second inner-conductor hole, that is, the side near the third inner-conductor hole.
摘要:
The invention provides a dielectric filter, comprising: a dielectric block having a first end face and a second end face and side faces extending therebetween; a plurality of resonator holes and at least one external coupling hole respectively passing through both end faces; inner conductors provided on inner faces of the resonator holes and the external coupling holes; an external conductor provided on the outer faces of the dielectric block; concavities provided in formation regions of the external coupling holes on the first and the second end face and in the short-circuiting regions of the resonator holes; and the external conductor being removed except from the portions of the concavities in the first end face and the second end face, thereby forming open faces of the resonator holes on the first end face and the second end face.
摘要:
A dielectric filter and a dielectric duplexer have structures for coupling between resonators, in which a range for determining the coupling strength between the resonators can be broadened and the polarity of the coupling can be changed. In addition, a communication apparatus incorporating the dielectric filter or the dielectric duplexer can be provided. Inside a dielectric member, resonance line holes having resonance lines formed on the inner surfaces thereof are disposed. Both ends of each of the resonance line holes are open-circuited. The inner diameter of each of the resonance line holes is changed at some point in the longitudinal direction of each resonance line to form a stepped part.
摘要:
Plural inner conductor formation holes 2a, 2b, and 2c having inner conductors formed on the inner walls thereof are arranged inside of a dielectric block 1, and an outer conductor 3 is formed so as to cover the outer surface of the dielectric block 1. The openings of the respective inner conductor formation holes 2a to 2c on the open end side have round hole shapes having substantially the same diameters. The cross-sections of a part of the inner conductor formation holes on the short-circuit end side have angular shapes.
摘要:
A dielectric duplexer has first and second filters passing two adjacent bands and is not influenced by signals in bands that are outwardly adjacent to the two passing bands. The space between small sectional area portions on short-circuit-end sides of first and second resonator holes is arranged to be relatively small, and the two resonator holes are coupled with each other according to a distributed-constant-type inductive coupling method. The space between small sectional area portions on short-circuit-end sides of fourth and fifth resonator holes is arranged to be relatively large, and the two resonator holes are coupled with each other according to a distributed-constant-type capacitive coupling method. Furthermore, the space between small sectional area portions on short-circuit-end sides of the fifth resonator hole and a sixth resonator hole is arranged to be relatively small, and the two resonator holes are coupled with each other according to a distributed-constant-type inductive coupling method. In this way, an attenuation pole is generated on a high-band side of a transmitting band according to the first and second resonator holes. Also, attenuation poles are individually generated on a high-band side and a low-band side of a receiving band according to the fourth, fifth, and sixth resonator holes.
摘要:
A dielectric resonant device having function of a dielectric filter and a dielectric duplexer having a desired external coupling capacitance includes a substantially rectangular-parallelepipedal dielectric block provided with inner conductive holes therein, and input-output electrodes on the outer surfaces extending from an open surface thereof. Also, a method is provided for forming input-output electrodes of the dielectric resonant device for obtaining a given external coupling capacitance, in which the input-output electrodes are formed by a cutting tool including cutting edges applied to two outer surfaces of the dielectric block along first conductive film removing lines on the two outer surfaces, extending from the open surface, and a cutting edge applied to the two outer surfaces along a second conductive film removing line connecting the first conductive film removing lines.
摘要:
A dielectric block includes a plurality of plated through holes each having an inner conductor formed thereon to form respective plated through holes. At least one of the plated through holes branches into two legs at the short circuit side thereof so that the two legs are close to the short circuit side of the plated through holes adjacent thereto. This allows the resonators formed of the plated through holes to be strongly inductively coupled with each other.
摘要:
A dielectric filter in which many attenuation poles can be generated, including attenuation poles generated by tap coupling, so that arbitrary passing characteristics and attenuation characteristics can be obtained. In this filter, inside a dielectric block there are formed through-holes having stepped structures in which inner conductors are disposed on the inner surfaces of the holes to capacitively couple the resonators. There are also formed lateral holes having conductive films disposed on the inner surfaces of the holes. The lateral holes are connected to input/output terminals in predetermined positions of the inner conductors. Further, terminal electrodes may be disposed adjacent to predetermined positions of the inner conductors. With this arrangement, attenuation poles are generated by both distributed constant resonator coupling and tap coupling on the low frequency side and/or the high frequency side of a pass band.
摘要:
A dielectric filter includes a dielectric block having substantially a rectangular parallelepiped shape, a plurality of internal-conductor-formed holes provided substantially parallel to one another in the dielectric block, each including an internal conductor formed on the internal surface thereof, an external conductor formed on the external surface of the dielectric block, and an input/output electrode formed on the external surface of the dielectric block. In the dielectric filter, the input/output electrode is formed from a side face, which is an end face of the dielectric block in a parallel direction of the internal-conductor-formed holes, to a bottom face, which is a mounting face of the dielectric block facing a mounting substrate, a capacitance is generated between the internal conductor of a first internal-conductor-formed hole closest to the end face and the internal conductor of a second internal-conductor-formed hole in the neighborhood of the first internal-conductor-formed hole, and the cross section of at least the first internal-conductor-formed hole is a noncircular shape extending in a direction parallel to the side face.
摘要:
The open faces of resonator holes of a dielectric filter are capable of being formed with high dimensional precision by a simple process, by which a coupling between resonators and an external coupling can easily be adjusted. In addition, a duplexer including the dielectric filter, and a communication apparatus including at least one of the dielectric filter and the duplexer are provided. The dielectric filter includes a dielectric block having protrusions on the upper surface of a substantially rectangular-parallelepiped base. Resonator holes are disposed by penetrating from the end faces of the protrusions to the lower surface of the base that opposes the end faces. External coupling holes are disposed by penetrating the opposing upper and lower surfaces of the base. An inner conductor is formed on the inner surface of each hole, and an outer conductor is formed on the substantially entire outer surface of the dielectric block except the end faces of the protrusions. Additionally, input and output electrodes separated from the outer conductor are formed at the openings of the external coupling holes on the lower surface of the dielectric block.