Murata Manufacturing Co., Ltd.

Murata Mfg. Co., Ltd.

Jun Hattori

Youhei Ishikawa

Shin Abe

Hiroyuki Kubo

Toru Kurisu

Toshio Nishikawa

Hiroki Wakamatsu

Norihiro Tanaka

Hideyuki Kato

Masamichi Andoh

Tomoyuki Ise

Takaya Wada

Tomiya Sonoda

Hiromu Tokudera

Taiyo Nishiyama

Hidekazu Wada

Kazuhiko Kubota

Kenji Saito

Eiichi Kobayashi

Shingo Okajima

Soshu Kirihara

Yoshinari Miyamoto

Yasushi Sano

Two TE modes whose electric-field rotating planes have a perpendicular relationship are coupled independently of the coupling between two TM modes whose electric-field directions have the same respective perpendicular relationships. In a multimode dielectric resonator device producing four modes: TM_x mode, TM_y mode, TE_x mode, and TE_y mode, protrusions (Pe), (Pe) are disposed on an upper-layer (La) and a lower-layer of a dielectric core () to cause a difference in effective dielectric constants of individual parts through which even-mode and odd-mode electric flux of the TE coupling modes passes. A protrusion (Pc) is formed on a middle-layer Lb of the dielectric core () such that the effective dielectric constants of the parts through which even-mode and odd-mode electric flux of the TM coupling modes pass become substantially equal. Thereby, the TE_x mode and TE_y mode are coupled while restraining the coupling of the TM_x mode and the TM_y mode.

Multimode dielectric resonator device, dielectric filter, composite dielectric filter and communication apparatus

First and second transmission paths Pand Pare disposed between a first port #connected to an antenna ANT and a second port #connected to a transceiving circuit. The first transmission path Pincludes receiving filters Rx, Rx, and Rx', an amplification circuit LNA, and 90&#xb0; hybrid circuitsand. The second transmission path Pincludes a transmitting filter Tx. A received signal amplified by the amplification circuit LNA is transmitted to the port #via the 90&#xb0; hybrid circuitsand, but is not transmitted to the second transmission path P. A transmission signal is transmitted from the port #to the second transmission path P. This prevents oscillation of the received signal due to positive feedback. A transceiving filter device that prevents degradation in the insertion loss, noise figure, and group delay characteristics in the transmission frequency band or the receiving frequency band and that prevents oscillation, and a communication apparatus using the transceiving filter device are provided.

Transmitting/receiving filter device and communication device

A three-dimensional periodic structure, a method of producing the same, a high frequency element, and a high frequency apparatus that can be applied to a signal transmission path or a functional element in, for example, a compact functional element in a frequency range lower than optical frequencies, such as the microwave range are provided. The three-dimensional periodic structure includes a three-dimensional periodic structure component which includes two substances having different dielectric constants periodically distributed in three-dimensional axial directions, a dielectric layer having a predetermined thickness provided at the periphery thereof, and a conductor provided on external surfaces of the dielectric layer. A third material which is different from the two substances and having predetermined dimensions embedded into the three-dimensional periodic structure component can be provided. A transmission path integrally equipped with a conductor is constructed, which is used as a pipe of a waveguide.

Three-dimensional periodic structure, method of producing the same, high frequency element, and high frequency apparatus

In a parallel multistage band-pass filter, a transmission line having an electrical length substantially equal to half (&#x3bb;/2) of the wavelength of the transmission signal is incorporated between the port on the input terminal side of the odd number (2n&#x2212;1)th resonator numbered from the input terminal side and the port on the input terminal side of the even number (2n)th resonator numbered from the input terminal side; and a transmission line having an electrical length substantially equal to &#x3bb;/2 is incorporated between the port on the output terminal side of the even number (2n)th resonator numbered from the input terminal side and the port on the output terminal side of the odd number (2n+1)th resonator numbered from the input terminal side. Moreover, a transmission line for adjustment of a transmission phase between the input terminal and the output terminal is incorporated between the first resonator numbered from the output terminal side and the output terminal.

Parallel multistage band-pass filter

A dielectric resonator device comprising resonators small in size, having plural stages, and a dielectric resonator device with a high Qo, in a multimode are provided. A substantially parallelepiped-shaped dielectric core to resonate in plural modes such as TM &dgr;-x, -y, -z, TE &dgr;-x, -y, -z, and so forth is disposed in the center of a substantially parallelepiped-shaped cavity. These plural resonance modes are utilized.

Multimode dielectric resonator device, dielectric filter, composite dielectric filter, synthesizer, distributor, and communication device

A dielectric filter that has attenuation poles on both the low frequency side and the high frequency side of its pass band, without using two dielectric resonators. The dielectric filter includes a cavity in which a conductive layer is formed, and a cross-shaped dielectric resonator disposed within the cavity, the dielectric resonator having at least three resonant modes, and coupling loops being coupled to the dielectric resonator. A coupling loop couples to a resonant mode at a first stage, among the resonant modes of the dielectric resonator, and also couples to resonant mode at a third stage in approximately negative-phase with respect to the first stage.

Dielectric filter, dielectric duplexer, and communication device

In a cavity body, a conductor rod is provided with least one end thereof being electrically connected to the cavity. A dielectric core is disposed in the cavity and the conductor rod extends through a hole in the dielectric core. With this structure, the cavity and the conductor rod constitute a resonator which operates in the quasi-TEM mode of a re-entrant cylindrical cavity resonator. The cavity and the dielectric core constitute a resonator which operates in the quasi-TM mode.

Resonator device, filter, composite filter device, duplexer, and communication device

A multimode dielectric resonator apparatus is configured such that a TM mode and a TE mode are transformed into multiplex modes, coupling between individual resonant modes can be easily made, and a large number of sequentially coupled stages can be obtained with a single dielectric core. In the multimode dielectric resonator apparatus, a dielectric core is configured of a plate-like TM-mode dielectric core portion and a TE-mode dielectric core portion protruding therefrom in the vertical direction, for example in a spherical shape. Five modes, namely a TMx mode, a TMy mode, a TEx mode, a TEy mode, and a TEz mode are used as multiplex modes. In addition, a filter and a duplexer use the multimode dielectric resonator apparatus, and a communication apparatus uses one or both of the filter and the duplexer.

Multimode dielectric resonator apparatus, filter, duplexer, and communication apparatus

A multimode dielectric resonator device is provided in which a dielectric core can be easily disposed in a cavity, a dielectric resonator device comprising resonators in plural stages can be obtained, and the Q is maintained at a high value. Dielectric cores to resonate in plural modes such as TM &dgr;&minus;(x&minus;z), TE &dgr;&minus;y, TM &dgr;&minus;(x&plus;z) or the like are supported substantially in the center of a cavity by means of a support in the state that the cores are substantially separated from the inner walls of the cavity at a predetermined interval, respectively.

Multimodal dielectric resonance device, dielectric filter, composite dielectric filter, synthesizer, distributor, and communication apparatus

Multi-mode dielectric resonance devices, dielectric filter, composite dielectric filter, synthesizer, distributor, and communication equipment

A multimode dielectric resonator apparatus is configured such that a TM mode and a TE mode are transformed into multiplex modes, coupling between individual resonant modes can be easily made, and a large number of sequentially coupled stages for a single dielectric core can be obtained. A dielectric core is configured of a plate-like TM-mode dielectric core portion and a TE-mode dielectric core portion protruding therefrom asymmetrically in the upper and lower directions. By this asymmetry of the TE-mode dielectric core portion with respect to the TM-mode dielectric core portion, for example, a TMx mode and a TEz mode may be coupled together, and concurrently, a TMy mode and a TEz mode may be coupled together.

Multimode dielectric resonator apparatus, filter, duplexer and communication apparatus

A dielectric filter exhibiting excellent filter characteristics in which the manufacturing cost is reduced by forming coupling loops for dielectric resonators generally in the same shape. First through fourth TM double-mode dielectric resonators are aligned in a row with their openings facing in the same direction. First and second metallic panels are screwed to the resonators to cover their openings. An input loop and an output loop are mounted on the first panel in such a manner that they obliquely face the intersecting areas of the respective dielectric members of the first and fourth dielectric resonators, respectively. Also attached to the first panel are generally 'V'-shaped coupling loops. Also disclosed is a dielectric duplexer constructed of a plurality of such dielectric filters.

Dielectric filter having a plurality of TM multi-mode dielectric

A dielectric resonator includes a cylindrical hole formed in the intersection of two resonator elements forming a TM dual-mode dielectric resonator element. The hole extends in a direction across the thickness of the TM dual-mode dielectric resonator element. Furthermore, a quadrangular pyramid-shaped hole having a closed end is formed in each connecting part between each resonator element and a cavity wall so manner that each hole extends from the outer surface of the cavity wall toward the inner portion of each resonator element, wherein the inner wall of each hole is covered with a conductor electrically connected to a cavity conductor. The shapes of the above holes are determined so that the TM dual-mode dielectric resonator element has the same resonance frequency for both TM 110 and TM 111-modes. The above arrangement makes it possible to provide a low-cost high-performance dielectric resonator having characteristics similar to those of a three-mode dielectric resonator, which can be produced in a small overall size.

Dielectric resonator

A dielectric resonator apparatus includes a plurality of TM double-mode dielectric resonators. Each dielectric resonator has a dielectric rod-complex, a casing provided with electrically conductive film at the outside surfaces, and metal panels covering the upper and lower openings of the casing. In adjacent TM double-mode dielectric resonators, at portions of the planes of the two casings opposing each other, apertures are provided in the direction of the magnetic field generated by two dielectric rods which have the same axial direction. A coupling member is also provided so as to form an electrically conductive loop which goes across the magnetic field.

Dielectric resonator apparatus with magnetic field coupling loop

A filter apparatus in accordance with the present invention comprises, for example, a band-pass filter and a plurality of band-stop filters connected as the post-stage to the band-pass filter. The band-pass filter transmits a band containing a desired frequency band, and the band-stop filters attenuate undesirable frequency bands. Another filter apparatus in accordance with the present invention comprises, for example, a first band-pass filter, a circulator connected to the first band-pass filter, and second band-pass filters connected to the circulator. The first band-pass filter transmits a band containing a desired frequency band to the circulator, and the second band-pass filters transmit undesirable frequency bands and reflect the desired frequency band back to the circulator. The desired frequency band is outputted from this circulator. Still another filter apparatus in accordance with the present invention comprises, for example, a circulator and a band-pass filter connected to the circulator. The band-pass filter transmits an undesirable frequency band and reflects a desired frequency band to the circulator. The desired frequency band is outputted from this circulator.

Growing community of inventors

Takatsuki, Japan

Jun Hattori