Oki Electric Industry Co., Ltd.

Ou Hok Huor

Nobuyoshi Sakamoto

A slot array antenna comprises a slot array antenna main body () and a dielectric cover (). The slot array antenna main body () has a slot plate (). A main beam () having radiation directivity, extending in a direction inclined a tilt angle &#x3b8; alone from a direction normal to a plane Pof the slot plate () is set to the slot array antenna main body (). The dielectric cover () has an inclination angle &#x3b1; formed by an outer plane Pand an inner plane Pand is comprised of a dielectric material having a refractive index n. The inner plane Pof the dielectric cover () is provided so as to oppose to the slot plate () of the slot array antenna main body (). Thus, the main beam () having the radiation directivity is transmitted through and refracted by the dielectric cover (), so that the tilt angle &#x3b8; is corrected to allow the main beam to extend in a direction orthogonal to the outer plane Pof the dielectric cover ().

Slot array antenna

In an RLS antenna, the present invention allows adjusting the optimum positional relationship between the feeder section of the feeder disk and the feeder section of the antenna disk, simply, quickly and at high accuracy by a visual check, so that mass production becomes possible, and an increase in performance and a decrease in cost are implemented. When the diameter of the antenna disk is D and the wavelength of the central frequency is &#x3bb;, a marker of about 0.10&#x3bb; or less is disposed in an area of 0.5 (D&#x2212;4&#x3bb;)&#x2212;0.5D distant from the center. A through hole with a size (opening area) through which the marker can be viewed is disposed at a position the same as the position of the marker on the feeder disk. By visually confirming that the marker is positioned at the center of the through hole, the antenna disk is positioned and secured on the feeder disk.

Radial line slot antenna

A resonator-type SAW filter has a ladder network of SAW resonators with respective interdigital transducers and reflectors. Individual ground patterns are provided for each interdigital transducer and each reflector in the shunt-arm SAW resonators. These ground patterns are electrically isolated from one another, and are grounded through separate bonding wires or other conductors that couple the ground patterns to a ground lead. This independent grounding scheme is found to improve the attenuation characteristic of the filter on the low side of the passband.

Resonator-type saw filter with independent ground patterns for interdigital transducers and reflectors

A surface-acoustic-wave device includes a surface-acoustic-wave filter with a capacitance connected in parallel between its input and output leads. The capacitance improves the attenuation characteristic of the device on the high-frequency side of the center frequency.

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Kanagawa, Japan

Ou Hok Huor