Murata Manufacturing Co., Ltd.

Ikuo Takakuwa

Toru Tanizaki

Atsushi Saitoh

Hiroshi Nishida

Yoshinori Taguchi

Nobumasa Kitamori

Taiyo Nishiyama

Fuminori Nakamura

Yohei Ishikawa

Nobuhiro Kondo

Kazutaka Higashi

Toshiro Hiratsuka

Toru Ishii

Tomohiro Nagai

Motoi Nakanishi

Tetsu Nishimura

Kazuya Sayanagi

Yukio Takimoto

Nobuhiro Kondou

On one surface of a dielectric substrate having a thickness of one quarter of a signal wavelength, a ground electrode, and a strip line, one end thereof being connected to a high-frequency element via a wire, are formed. On the opposite surface thereof, which opposes a waveguide, a ground electrode is formed, a first electrode opening having a predetermined length and width is formed, opposite to a proximity of an open end of the strip line, and a second electrode opening is formed so that a center line of a width thereof is separated outward by one quarter of the signal wavelength from a conductor wall of the waveguide. Furthermore, via holes having a length of one quarter of the signal wavelength, electrically connecting the ground electrodes on either surface, are formed. The waveguide is disposed in proximity to the dielectric substrate so that a center of the first electrode opening coincides with that of the waveguide.

High-frequency line transducer, having an electrode opening surrounded by inner and outer vias

An antenna device capable of increasing the speed of scanning as well as extending the scanning angular range of a beam to obtain a high gain. A radar module and a communication apparatus having enhanced detection capabilities obtainable by using the antenna device. In the antenna device, electromagnetic waves radiated from a primary radiator are transmitted to a plurality of openings, e.g., dielectric lenses and/or reflectors or optical transmitters. The dielectric openings are arranged on a fixed portion and the primary radiator is arranged on a moving portion. The moving portion is displaced relatively with respect to the fixed portion. This arrangement enables the selection of an opening used for receiving each of the electromagnetic waves from the primary radiator to change the direction of the beam.

Antenna device, communication apparatus and radar module

By changing the direction of a detection radio-wave beam within a detection-angle range and by detecting reflected-signal intensities, wherein each of the reflected-signal intensities is detected for each predetermined unit angle, moving averages of the reflected-signal intensities are calculated by using an angular width predetermined for a given distance as an average width. Thus, data of a reflected-signal-intensity distribution is obtained. Accordingly, the direction of a target is detected by finding the direction of the highest reflected-signal intensity.

Method and radar for detecting distance to a target

A dielectric waveguide designed to avoid the influence of reflection of electromagnetic waves at connected portions of dielectric strips and to have an improved characteristic. The distance L between connection planes between pairs of dielectric strips adjacent in the direction of propagation of an electromagnetic wave is set to an odd number multiple of &frac14; of the guide wavelength. Reflected waves are thereby superposed in phase opposition to each other to cancel out. In this manner, propagation of a reflected signal to ports is limited.

Dielectric waveguide with pairs of dielectric strips connected in an off-set manner

An antenna apparatus such that a dielectric strip and a dielectric resonator are provided to form a primary vertical radiator, another dielectric strip is provided which is coupled to the dielectric strip to form a directional coupler, and a radiation beam is tilted by changing the relative position of the primary radiator with respect to the dielectric lens by displacing the primary vertical radiator in the directional coupler.

Antenna apparatus and transmission and receiving apparatus using same

In a non-radiative dielectric line, slots opposing each other are respectively formed on two conductive plates and a dielectric strip is disposed within both the slots to form a NRD guide. Convex portions &ldquo;P&rdquo; protruding in the lateral direction to the propagating direction of an electromagnetic wave are formed at a predetermined position of the dielectric strip while concave portions &ldquo;H&rdquo; are formed on internal surfaces of the slots in the conductive plates and so as to mate the both of them with each other. Variations in characteristics due to the positional slippage of the dielectric strip and so forth are prevented, and even when the dielectric strip is produced by machining, etc., the process is easily performed. Characteristics as a transmission line are also maintained without disturbing the electromagnetic field distribution in a mode to be propagated.

Non-radiative dielectric line including convex or concave portion, and integrated circuit comprising the non-radiative dielectric line

A non-radiative hybrid dielectric line transition permits a line transformation between two different types of non-radiative dielectric lines to be performed in a limited space. In addition, a non-radiative dielectric line component, an antenna apparatus, and a wireless apparatus include the above line transition. In this structure, a dielectric strip is disposed between a lower conductive plate and an upper conductive plate to form each of a hyper NRD waveguide (HNRD) and a normal NRD waveguide (NNRD). Between the two waveguides, grooves whose depths gradually become shallow from the HNRD to the NNRD are formed for receiving a third non-radiative dielectric line for performing a line transformation.

Non-radiative hybrid dielectric line transition and apparatus incorporating the same

A directional coupler including a first transmission line and a second transmission line adjacent to the first transmission line, the relative positions of the first transmission line and the second transmission line being changeable, an antenna element connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the antenna element.

Directional coupler, antenna device, and transmitting-receiving device

A dielectric line converter which includes a dielectric stripline; an upper conductor surface and a lower conductor surface sandwiching the dielectric stripline; the upper and lower conductor surfaces having a first spacing in a first region along the dielectric stripline so as to form a first-kind dielectric line, a second spacing which is substantially zero in a second region so as to form a second-kind dielectric line, and a third spacing which is less than the first spacing in a line conversion region between the first and second regions. Grooves may be formed in the opposing surfaces of the upper and lower conductor surfaces, and the dielectric stripline may be arranged in the grooves. Impedance matching between the first-kind and second-kind dielectric lines is arranged n the line conversion region. The length of the line conversion portion may be set to be an odd multiple of &lgr;/4.

Dielectric line converter, dielectric line unit, directional coupler, high-frequency circuit mobile, and transmitter-receiver

Antenna apparatus and transmission and receiving apparatus using the same

A nonradiative dielectric waveguide filter of the present invention permits the manufacturing process including the production of a dielectric strip to be simpler. The filter can be formed by a pillar dielectric strip. The nonradiative dielectric waveguide filter includes resonators, input-output connection units, and cut-off regions, in which the upper and lower conductor plates and a dielectric strip disposed therebetween form the filter. In one example, the main signal-transmitting mode is the LSM mode; a groove having a bottom and conductor walls is disposed in a position in which the conductor plates are opposing; the resonator is formed by fitting the dielectric strip into the groove; and the cut-off regions are formed by second grooves formed in the conductor plates adjacent to the dielectric strip.

Nonradiative dielectric waveguide resonator, nonradiative dielectric waveguide filter, duplexer and transceiver incorporating the same

A dielectric waveguide designed to avoid the influence of reflection of electromagnetic waves at connected portions of dielectric strips and to have an improved characteristic. A third dielectric strip is inserted in a part of a connection section at which a first dielectric strip and a second dielectric strip are connected to each other, and the distances between the three connection planes in said connection section are determined so that a wave reflected at the connection plane between the first and third dielectric strips, a wave reflected at the connection plane between the first and second dielectric strips, and a wave reflected at the connection plane between the second and third dielectric strips are superposed with a phase difference of 2&pgr;/3 from each other. Alternatively or in addition, the distance between the first-second dielectric strip connection plane and the first-third dielectric strip connection plane is set to &frac16; of the guide wavelength of an electromagnetic wave propagating through the dielectric strips, and the distance between the first-second dielectric strip connection plane and the second-third dielectric strip connection plane is set to &frac16; of the guide wavelength. Reflected waves are thereby superposed in phase opposition to each other to cancel out. In this manner, propagation of a reflected signal to ports is limited.

Dielectric waveguide comprising connected dielectric strips

In a directional coupler comprising two separated dielectric guides, reflection and loss in the separation position (separated faces) is reduced. Furthermore, the beam of an antenna device comprising a primary emitter and a dielectric lens can be tilted quickly even by a low-torque motor. A moving portion and a fixed portion each comprise dielectric guides, and in addition, grooves are provided in opposing end faces of conductive plates thereof, at a distance from the electrode faces of the dielectric guides of approximately an integral multiple of half the wavelength of the transmitted waves. Furthermore, the dielectric guide of the directional coupler portion is a normal NRD guide, and the dielectric guide of another portion is a hyper NRD guide.

Directional coupler, antenna device, and transceiver

In a millimeter wave module or the like having both a normal NRD guide and a hyper NRD guide, a conversion portion structure for non, radiative dielectric waveguides of different types has excellent conversion characteristics at the connection between the two types of NRD guides. In a first conversion portion, the width of a dielectric strip is changed from the width of a dielectric strip in the hyper NRD guide portion to the width of a dielectric strip in the normal NRD guide portion, grooves of approximately the same depth as grooves in the hyper NRD guide are provided extending as far as the second conversion portion, and in a third conversion portion, the width of these grooves widens perpendicular to the propagation direction of electromagnetic waves and parallel to the face of conductive plates. According to this structure, guide conversion can be achieved with low radiation in a predetermined frequency band.

Non radiative dielectric waveguide having a portion for line conversion

A dielectric line has a conductor plate and dielectric strip on the side of a fixed portion and a dielectric line including a conductor plate and dielectric strip on the side of a moving portion. A directional coupler comprises the dielectric lines. On a dielectric plate of an array antenna portion a plurality of linear array antennas are formed and connected to a microstrip as a feed portion. By displacement of the moving portion, the feed point to the feed portion is changed and the feed phase to each linear array antenna and the feed power to each element antenna are changed. Thus, the direction of a beam is changed.

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Suita, Japan

Ikuo Takakuwa