Un filtre ceramique passe-bande unique (100) se compose d'un bloc dielectrique (130) possedant un ou plusieurs trous (101-106) s'etendant de sa surface superieure jusqu'a sa surface inferieure et possedant egalement des electrodes d'entree et de sortie (124, 125) disposees chacune sur le bloc dielectrique a une distance predeterminee d'un trou correspondant. A single bandpass ceramic filter (100) comprises a dielectric block (130) having one or more holes (101-106) extending from its upper surface to its lower surface and also having electrodes of inlet and outlet (124, 125) each disposed on the dielectric block at a predetermined distance from a corresponding hole. Le materiau dielectrique est de preference en ceramique comprenant du BAO, du TuO2 et du ZrO2. The dielectric material is preferably ceramic comprising BAO, the TuO2 and ZrO2. Lorsqu'il n'y a qu'un trou dans le bloc dielectrique, les electrodes d'entree et de sortie peuvent etre disposees autour de ce trou. When there is a hole in the dielectric block, input and output electrodes can be disposed around the hole. Si il y a deux ou plusieurs trous dans le bloc dielectrique, une electrode peut etre disposee a proximite du trou a une extremite et l'autre electrode peut etre disposee a proximite du trou a l'extremite opposee du bloc dielectrique. If there are two or more holes in the dielectric block, an electrode can be disposed near the hole at one end and the other electrode can be disposed near the hole at the opposite end of the dielectric block. Celui-ci est entierement cuivre ou argente a l'exception des parties a proximite de chaque trou et des electrodes d'entree et de sortie. This is entirely copper or silver except for the parts near each hole and input and output electrodes. Chaque trou plaque constitue essentiellement un resonateur coaxial. Each plated hole essentially a coaxial resonator. Le couplage entre des resonateurs coaxiaux adjacents obtenu a l'aide des trous plaques peut etre regle grâce a des fentes (110-114) ou a des trous supplementaires disposes entre les elements. The coupling between adjacent coaxial resonators obtained using plated holes can be adjusted by means of slots (110-114) or additional holes disposed between the elements. Deux ou plusieurs filtres ceramiques passe-bande uniques peuvent etre couples pour obtenir un filtre presentant une selectivite superieure ou un filtre multi-bande pour combiner et/ou trier selon la frequence deux ou plusieurs signaux en un signal composite ou a partir de celui-ci. Two or more single bandpass ceramic filters can be coupled to obtain a filter having higher selectivity or a multi-band filter for combining and / or sorting by frequency two or more signals into a composite signal or from the latter .

Ceramic bandpass filter.

A ceramic filter employs a novel tuning process which avoids the necessity of etching or abrading plating on the surface of the filter. The tuning is provided by determining a selected frequency related characteristic of the dielectric making up the block portion of the ceramic filter. For example, the quarter wave length frequency of the block may be measured. Next, plating artwork is designed in accordance with the determined selected frequency related characteristic. The artwork is then used for selectively applying a conductive material to a surface of the block in order to shift the determined selected frequency related characteristic to a desired (specified) frequency characteristic. By appropriately designing the artwork based on the determined selected frequency related characteristic, no etching or abrading to the plating on the block is required.

Tuneless monolithic ceramic filter manufactured by using an art-work mask process

An improved distribution constant type electrical filter which is so arranged that columnar or cylindrical dielectric units each having conductive wires axially extended through it, are inserted into through openings formed in a dielectric material block and provided on their inner peripheral faces with inner electrically conductive layers for electrostatic coupling between the conductive wires and the inner electrically conductive layers.

Distribution constant type filter

An encoder receives a signal. The encoder utilizes one or more downsample operations to produce downsampled renditions of the signal at successively lower levels of quality in the hierarchy. In a reverse direction, the encoder applies the one or more upsample operations to a downsampled rendition of the signal at a first level of quality to produce an upsampled rendition of the signal at a second level of quality in the hierarchy. The second level of quality is higher than the first level of quality. The one or more upsample operations and one or more downsample operations can be asymmetrical with respect to each other. That is, the function applied during downsampling can differ from the function applied when upsampling. The encoder produces residual data indicating a difference between the downsampled rendition of the signal at the second level of quality and the upsampled rendition of the signal at the second level of quality.

Signal processing and tiered signal encoding

A high-frequency bandpass filter, including several cylindrical conductor rods (3, 4) arranged in a line with predetermined spacings in a continuous space defined by an elongated housing (1) made of an electrically conductive material and closed on all sides, each conductor rod being attached and short-circuited at its first end to the housing (1) and spaced apart from the housing at its second end so that each conductor rod forms a coaxial resonator together with the housing. The second end of each conductor rod includes a portion (4) larger in diameter as compared with the remaining portion of the conductor rod, and the type of a coupling between two adjacent coaxial resonators is arranged to be set to be predominantly capacitive or predominantly inductive by adjusting the ratio of the distance between the first ends of the conductor rods (3, 4) of the coaxial resonators to a distance between the portions (4) with a larger diameter.

Comb-line high-frequency band-pass filter having adjustment for varying coupling type between adjacent coaxial resonators

A high frequency filter for frequencies higher than the VHF band comprising a closed conductive housing (53), a pair of input and/or output means (54) like an antenna provided at both the extreme ends (53-5, 53-6) of said housing (53), a plurality of resonators (51-1 through 51-5, and 51a-1 through 51 a-5) arranged on a straight line between said antennas (54), each of said resonators having an elongated inner conductor (51a-1 through 51 a-5) with a circular cross section, and an elongated rectangular dielectric body (51-1 through 51-5) surrounding said inner conductor, one end of each of said resonators being fixed atthe single plane (53-1) of the housing (53) and the other end of each of said resonators being free standing. The length of said inner conductor and the dielectric body is substantially wavelength, and the distance (52-1 through 52-4) between two resonators is determined according tothe specified coupling coefficient for the desired characteristics of the filter. Due to the rectangular dielectric body (51-1 through 51-5), each resonator is stably mounted on the housing (53), and then, the stable characteristics of the filter is obtained. Thus, the use in a vibrated circumstance like a mobile communication is possible. That rectangular dielectric body (51-1 through 51-5) also provides the larger coupling coefficients between resonators, and then, the wideband filter can be obtained.

A high frequency filter

PROBLEM TO BE SOLVED: To provide a signal processing apparatus and method capable of demodulating a signal including a control signal subjected to spread spectrum processing and transmission data modulated by a prescribed modulation system. SOLUTION: The signal processing apparatus includes: an orthogonal demodulator 106 for converting an input signal into an I-Q baseband signal; a multipath detection circuit having a first correlation unit for using a spread code to apply inverse spread processing to the baseband signal and a peak detection circuit for detecting a peak of an output of the first correlation unit; a second correlation unit for carrying out inverse spread processing with the spread code by using a maximum peak position of the correlation output detected by the peak detection circuit for a demodulation timing; a phase discrimination circuit for detecting an output phase of the second correlation unit at the maximum peak position of a symbol period obtained by the multipath detection circuit 110; a spread code demodulator for demodulating the baseband signal on the basis of an output of the phase discrimination circuit; a first equalizer for applying waveform equalization to the control signal; and a second equalizer 140 for receiving an output of the first equalizer 120 to apply waveform equalization to the transmission data. COPYRIGHT: (C)2005,JPO&NCIPI

Signal processing apparatus and method

PURPOSE:To adjust easily and accurately a resonance frequency by providing an electrode for capacitance adjustment formed with many metallic pieces in mesh form to an open end side of a dielectric resonator so as to control the area of the electrode. CONSTITUTION:The electrode 35 for capacitance adjustment made of many metallic pieces divided minutely is provided to an upper face (open end side) 34 of the dielectric resonator 31 consisting of one dielectric and the electrode 35 is connected to a metallic rod (inner conductor) 36. In cutting the resonator into halves and viewing them from the X direction, a dielectric 53 is found between the electrode 52 and a side face 54, and when the electrode 52 and the side face 54 are approached together, the capacitance 55 formed by them is increased and the resonance frequency of the resonator is decreased. Thus, when B (1, 1) and B (1, n) are cut off from the metallic pieces divided minutely of the electrode, it is found that the resonance frequency is increased most. The resonance frequency is adjusted easily and accurately by controlling the area of the electrode in this way.

Dielectric resonator and method for adjusting resonance frequency of dielectric resonator

PURPOSE:To achieve a dielectric substance filter with low cost, small size and good reproducibility for electric characteristics, by providing a plate dielectric substance in a closed metallic housing, inner conductor formed in it and input/output coupling means, and forming grooves between the inner conductors to the dielectric substance. CONSTITUTION:A flat plate dielectric substance 51 and a coupling antenna 4 being an input/output means are provided in a metallic case 3, and an inner conductor 51a having circular cross section is provided in parallel in the flat plate of the substance 51. The inner conductor 51a forms a 1/4 wavelength resonator and it is shortened on a lower surface 3-1 of the case 3. Cutting grooves 52 having W width and (l) length are provided to the dielectric substance 51 in parallel with the inner conductor 51a. Electric field coupling between the inner conductors 51a is rapidly decreased through the lowering in the equivalent dielectric constant of the dielectric substance due to the presence of air, the magnetic flux phi is almost zero around the open end B of the inner conductor and the electric field (e) is about maximum. A required resonator coupling can be formed, by fixing one of width or length of the grooves 52 and changing another, allowing to achieve a filter with a suitable band width.

Dielectric substance filter

PURPOSE:To make easy the airtight processing of case and to increase the productivity, by cnstituting a coupling circuit with strip lines provided to a dielectric substrate. CONSTITUTION:A coupling circuit 6 is constituted on a dielectric substrate 7 with a Y-branch formed with strip lines 10, 11, and the electric line length of an arm 8 for Y-branch is determined so that the impedance viewing one of transmission and reception BPF's 1, 2 from the cross point of Y-branch is an open impedance mutually in the center frequency through another BPF. Further, a strip piece 16 provided in parallel with an arm 8 is connected to the arm 8 as required, and the case for the circuit is separately provided from those for transmission BPF1 and reception BPF2, and the connection between the coupling circuit 6 and BPF's 1, 2 is made via an airtight terminal 12 provided at BPF sides.

Yoshida Tatsumasa

Papers

A high frequency filter

Signal processing apparatus and method

Dielectric resonator and method for adjusting resonance frequency of dielectric resonator

Dielectric substance filter

Common device for antenna