摘要:
A dielectric substrate having a radiation electrode 3 and a feed electrode 4 formed thereon is formed such that a plurality of insulator layers 7a to 7e are stacked and combined. An open end 3K of the radiation electrode 3 and a capacitive coupling end 4Y of the feed electrode 4 are formed on a surface of the same insulator layer of the dielectric substrate 2. A floating electrode 5 is formed on a surface of an insulator layer on which the open end 3K of the radiation electrode 3 and the capacitive coupling end 4Y of the feed electrode 4 are not formed. The floating electrode 5 is arranged to commonly face both the open end 3K of the radiation electrode 3 and the capacitive coupling end 4Y of the feed electrode 4 in the stacking direction of the insulator layers 7a to 7e.
摘要:
A signal reception circuit includes a main antenna which receives signals in at least two predetermined reception frequency bands. A sub-antenna receives a signal in one of the reception frequency bands of the main antenna. A filter for interrupting a signal in the same frequency band as the reception frequency band of the sub-antenna is provided on a transmission line of a reception signal of the main antenna. A filter reflection signal in the same frequency band as the reception frequency band of the sub-antenna is induced in the sub-antenna, due to the antenna coupling thereof. The phase of the filter reflection signal is adjusted by a phase shifter between the main antenna and the filter, so that the induced signal of the sub-antenna is in phase with the reception signal of the sub-antenna. As a result, the level of the composed signal of the induced signal and the reception signal and is to be transmitted from the sub-antenna to a signal processing unit is greatly improved.
摘要:
A surface mount antenna includes a substrate and a radiation electrode (having a predetermined resonance frequency) disposed on the substrate. An electrode is formed to cover four continuously connected surfaces including the front surface, the front end surface, the rear surface and the rear end surface of each substrate. Then, a dicer is used to cut a slit on the radiation electrode formed on the surface of the dielectric substrate. Here, the slit is arranged in a direction intersecting a direction &agr; connecting the two end surfaces. Subsequently, the dielectric substrate is cut into a plurality of portions along the direction &agr;, thus producing a plurality of surface mount antennas each including a substantially rectangular substrate and a radiation electrode formed essentially surrounding an outer circumference of the substrate.
摘要:
This disclosure provides a flexible substrate antenna and antenna device including a flexible substrate antenna. The flexible substrate antenna includes a first parasitic radiation electrode and a second parasitic radiation electrode provided on the flexible substrate, where a leading ends (open ends) of the first parasitic radiation electrode and the second parasitic radiation electrode face each other with a slit of a predetermined gap therebetween. Further, a capacitive feed electrode is formed on the flexible substrate at a position facing the first parasitic radiation electrode, and is configured to capacitively feed power to the first parasitic radiation electrode.
摘要:
An antenna includes a base, a first radiating element, and second radiating element. The first radiating element is open at a first end thereof, is connected to a ground point at a second end thereof, and resonates in a substantially ¼ wavelength mode in a first communication frequency band. A feed line is connected between a first feed point and a predetermined position between the first end and the second end of the first radiating element. The second radiating element has a first end that is a second feed point, a second end that is connected to the ground point, and resonates in a substantially ½ wavelength mode in a second communication frequency band. A distance from the ground point to the second feed point is longer than a distance from the ground point to the first feed point.
摘要:
A circularly polarized microstrip antenna includes a dielectric substrate having only an emitting electrode for generating circularly polarized waves on a front surface of the dielectric substrate and a coplanar signal line for feeding the emitting electrode and a ground electrode on a back surface of the dielectric substrate. The ground electrode covers the entire area of the back surface of the dielectric substrate excluding a region in which the signal line is provided. The signal line extends from an edge of the back surface of the dielectric substrate to an intermediate position between the edge of the back surface of the dielectric substrate and a center position O of the emitting electrode on the back surface of the dielectric substrate. Thus, a circularly polarized microstrip antenna whose circular polarization characteristic can be easily improved and whose manufacturing cost and size can be easily reduced is provided.
摘要:
A surface mount antenna having a substrate made of at least one of a dielectric material and a magnetic material, the substrate having a substantially rectangular prism shape and including a first major surface and a second major surface; a ground electrode disposed on the first major surface of the substrate; a radiation electrode having a strip shape disposed at least on the second major surface of the substrate; a feeding electrode disposed on at least one surface of the substrate; and the radiation electrode including an open end portion and a plurality of grounded end portions, the open end portion being arranged close to the feeding electrode with a gap therebetween on the substrate, and the plurality of the grounded end portions being connected to the ground electrode on different portions of the substrate, respectively. The above described antenna has an enhanced gain without changes in size.
摘要:
The invention provides a low-profile circular-polarization antenna that can be implemented at a reduced mounting cost of components. Two linear-polarization surface-mount antennas are mounted on a mounting substrate such that their planes of polarization are perpendicular to each other in the direction normal to the mounting surface, and an amplification circuit, a shield case for covering the circuit, and a phase circuit for sending signals having the same amplitude and a phase difference of 90 degrees to the two surface-mount antennas are provided on the same mounting surface.
摘要:
This disclosure provides a flexible substrate antenna and antenna device including a flexible substrate antenna. The flexible substrate antenna includes a first parasitic radiation electrode and a second parasitic radiation electrode provided on the flexible substrate, where a leading ends (open ends) of the first parasitic radiation electrode and the second parasitic radiation electrode face each other with a slit of a predetermined gap therebetween. Further, a capacitive feed electrode is formed on the flexible substrate at a position facing the first parasitic radiation electrode, and is configured to capacitively feed power to the first parasitic radiation electrode.
摘要:
An antenna includes a base, a first radiating element, and second radiating element. The first radiating element is open at a first end thereof, is connected to a ground point at a second end thereof, and resonates in a substantially ¼ wavelength mode in a first communication frequency band. A feed line is connected between a first feed point and a predetermined position between the first end and the second end of the first radiating element. The second radiating element has a first end that is a second feed point, a second end that is connected to the ground point, and resonates in a substantially ½ wavelength mode in a second communication frequency band. A distance from the ground point to the second feed point is longer than a distance from the ground point to the first feed point.