A dielectric resonator element array (DRA) antenna system that is small, compact, has high gain in the direction of intended communication, minimized interference in unintended directions of communication and a wide bandwidth. The antenna system comprises a ground plane, a feed structure, a beam shaping and steering controller, a mounting apparatus, an array of dielectric resonator elements and a radome that is close to or in contact with the array. The mounting apparatus preferably is configured so as not to appreciably increase the size of the system when mounted. The controller receives and processes information relating to one or more of object latitude, longitude, attitude, direction of travel, intended direction of communication and unintended directions of communication. The controller processes this information and determines excitation phase for the array elements.

Dielectric-resonator array antenna system

A foldable portable wireless device is provided with a freely openable/closable mechanism wherein a lower case (101) is connected with an upper case (102) with a hinge section (103). In the foldable portable wireless device, a flexible cable (106) which connects a lower circuit board (104) with an upper circuit board (105) is arranged in the vicinity of the hinge section (103) at a prescribed distance from a power feeding section (112) of an antenna element (113) in a width direction of the foldable cellular phone. One end of a conductor element (114) is short-circuited in the vicinity of a connector (107), which connects the flexible cable (106) with the lower circuit board (104), by using a short-circuiting conductor (115). Thus, by the foldable portable wireless device, an energy quantity absorbed into the human head can be reduced without reducing power of the electric waves transmitted during a call.

Portable wireless device

A millimeter-wave radar has a radome or radar cover including a layer, the dielectric constant of which is a greater than that of the other portion without the layer, or including a magnetic loss layer in an appropriate position with respect to the antenna. The dielectric constant of the radome or radar cover can be made higher in a portion corresponding to the side of the antenna than in a portion corresponding to the front of the antenna.

Millimeter wave-radar and method for manufacturing the same

A feed network for an antenna subarray includes a first feed arrangement, a second feed arrangement, a fixed attenuator, a first power divider/combiner, a variable phase shifter, a variable attenuator, a second power divider/combiner, a first circulator, and a third power divider/combiner arranged to provide an interchangeable feed network.

An rf feed network for modular active aperture electronically steered arrays

A mixed-signal, multilayer printed wiring board fabricated in a single lamination step is described. The PWB includes one or more radio frequency (RF) interconnects between different circuit layers on different circuit boards which make up the PWB. The PWB includes a number of unit cells with radiating elements and an RF cage disposed around each unit cell to isolate the unit cell. A plurality of flip-chip circuits are disposed on an external surface of the PWB and a heat sink can be disposed over the flip chip components.

Transmit/Receive Daughter Card With Integral Circulator

PROBLEM TO BE SOLVED: To obtain a microstrip antenna which can be balanced highly in axial ratio at a wide angle, broad band, and low loss. SOLUTION: A microstrip antenna is provided with an earth conductor 2, a parasitic conductor 7 which is laid separately from the conductor 2, a feeding conductor 3 which is laid between the conductors 2 and 7 so that a prescribed voltage may by applied across the conductors 2 and 3, and a wall-like member 5 which is arranged around an inter-conductor space demarcated by connecting the peripheral edge of the conductor 7 to that of the conductor 3 and made of a dielectric or conductive material.

Microstrip antenna and microstrip antenna substrate

PROBLEM TO BE SOLVED: To make a microstrip array antenna thin, light in weight and inexpensive low cost to facilitate manufacturing and also to improve reliability by using a resistance film for the isolation terminal of a specific wavelength side connection type directional coupler. SOLUTION: An isolation terminal of a quarter-wave side connection type directional coupler 13 is made of a resistance film 14. The coupler 13 is a power synthesis/distribution circuit whose reflection amount is so small that for all the input terminals, a strong distribution side output terminal and a weak distribution side output terminal can perform impedance matching. Thus, each element of an array antenna can be made into an almost desired radiation distribution to facilitate obtaining the desired excitation characteristics. The coupler 13 can also obtain desired power distribution characteristics by normally making two microstrip lines approach each other almost as long as the line length of 1/4 wavelength so as to arrange them and make the interval between the two microstrip lines a prescribed value.

Microstrip array antenna

PROBLEM TO BE SOLVED: To reduce cross polarization, due to the electrical coupling with improvement of the characteristic and to secure a coplanar constitution for both strip antenna and strip line for facilitating the production and the cost reduction of a planar antenna by forming a slit having an angle to eliminate the radiation received from a feeder line at the center part of a microstrip antenna. SOLUTION: A microstrip antenna 4 has a slit 9 which has an angle different from the polarized wave that is obtained by a feeder line microstrip 6. The direction 13 of the polarized wave can be changed by the control of the angle of the slit 9. The angle of the slit 9 is controlled in the direction, where the polarized wave radiated from the feeder line 6 is eliminated. The direction 13 is controlled, and the influence of the polarized wave radiated from the line 6 is reduced to secure a desired polarized wave. As a result, it is possible to reduce cross polarization, to improve the antenna radiation efficiency and also to facilitate the designing and production of a plane antenna without troublesome changes required for the feeding position, regardless of the dielectric constant and the thickness of a substrate. COPYRIGHT: (C)1998,JPO

Millimeter-wave planar antenna

PROBLEM TO BE SOLVED: To obtain a multi-frequency band common use antenna system that has a desired electric field strength distribution even at a low frequency band. SOLUTION: In this multi-frequency band common use antenna system consisting of a main reflecting mirror 1, a frequency selection mirror surface 2 consisting of a dielectrical body 3a and a resonator element 8 placed on the dielectric body 3a and comprising a plurality of metallic foils, a high frequency band use primary radiator 4 placed in front of the frequency selection mirror surface 2, and a low frequency band use primary radiator 5 placed on a rear face of the frequency selection mirror surface 2, the dielectric body 3 is formed to be a lens. Furthermore, a plurality of low-frequency band use primary radiator 5 are arranged to be an array. Moreover, the main reflecting mirror 1 and the frequency selection mirror surface 2 are used for correction mirror surfaces.

Multi-frequency band common use antenna system

PURPOSE: To provide an antenna device capable of suppressing radiation from a power feeding line, suppressing an unnecessary parallel plane mode and feeding power to a radiation conductor with improved coupling efficiency by a simple structure. CONSTITUTION: A first ground conductor plate 1, a first substrate 2, a resonator 3 provided with the power feeding line 12, a second substrate 4, a second ground conductor plate 5 provided with a coupling hole 8 in a size less than a half wavelength, a third substrate 6 and the radiation conductor 7 are turned to a multilayer substrate in an order and a first microstrip antenna 10 provided kith the first ground conductor plate, the first substrate and the resonator provided with the power feeding line is resonated and is electromagnetically coupled with the radiation conductor 7 of a second microstrip antenna 11 provided with the second ground conductor plate 5, the third substrate 6 and the radiation conductor 7 through the coupling hole 8 provided on the second ground conductor plate 5 from the resonator 3. COPYRIGHT: (C)1995,JPO

裕幸大嶺

Papers

Microstrip antenna and microstrip antenna substrate

Microstrip array antenna

Millimeter-wave planar antenna

Multi-frequency band common use antenna system

Antenna device and power feeding device

裕幸 大嶺

Papers

Microstrip antenna and microstrip antenna substrate

Microstrip array antenna

Millimeter-wave planar antenna

Multi-frequency band common use antenna system

Antenna device and power feeding device

裕幸大嶺