摘要:
An antenna device includes a ground; a monopole antenna including a first section running from a feeding point along the ground, a second section running in a direction away from the ground, and a third section running along the ground, the monopole antenna having a length corresponding to 1/4 of a wavelength at a first resonance frequency; a parasitic element including a first section whose end is connected to the ground in the vicinity of the end of the first section of the monopole antenna and that runs in a direction away from the ground, and a second section, the parasitic element having a length corresponding to 1/4 of a wavelength at a second resonance frequency; and a dipole antenna provided along the third section of the monopole antenna and the parasitic element, the dipole antenna having a length corresponding to 1/2 of a wavelength at a third resonance frequency.
摘要:
An antenna apparatus includes a first ground plane (20); a second ground plane (30) having first, second, third and fourth sides, a cutout part, and a slit (40) having an open end (41); a first radiating element (110) having first and second lines, and a feeding point (115); a second radiating element (120) having a third line; and a parasitic element (130) having first and second parasitic lines. A length from the feeding point to an end part of the slit is set to one-half wavelength at a first communication frequency, a total length of a length from an end part of the fourth line to the feeding point, and a length from a ground potential point (38) to an end part of the second parasitic line is set to one-half wavelength at a second communication frequency, and a length of the third line and the fourth line is set to one-quarter wavelength at a third communication frequency.
摘要:
An antenna device includes: a ground electrode; a first dielectric layer which is provided on one surface of the ground electrode; a feed plate which is provided on a surface of the first dielectric layer opposite from the ground electrode, and which is shorted to the ground electrode; a feed line which feeds to the feed plate; a second dielectric layer which is provided in such a manner as to sandwich the feed plate in combination with the first dielectric layer; and a radiation electrode which is provided on a surface of the second dielectric layer opposite from the feed plate, and which is fed by being electrically connected to the feed plate at a feed point and thereby radiates or receives a radiowave with a first frequency.
摘要:
An object is to provide an antenna device that can handle three or more frequency bands. An antenna device includes: a ground plane having an edge; a matching circuit; and a T-shaped antenna element including a first element and a second element extending from a feed point to a first end part and a second end part, wherein a first length from a corresponding point for the edge to the first end part is longer than a second length from the corresponding point to the second end part, wherein the first length is shorter than 1/4 of a first wavelength of a first frequency, wherein the second length is shorter than 1/4 of a second wavelength of a second frequency and longer than 1/4 of a third wavelength of a third frequency, wherein the first element has a resonance frequency that is higher than the first frequency, wherein the second element has a resonance frequency between the second frequency and the third frequency, wherein a first value obtained by dividing a length from the corresponding point to the first bend part by the first wavelength is less than or equal to a second value obtained by dividing a length from the corresponding point to the second bend part by the second wavelength, and wherein an imaginary component of an impedance of the matching circuit takes a positive value at the first frequency and the second frequency and takes a negative value at the third frequency.
摘要:
A non-transitory computer-readable storage medium storing an antenna design program that causes a computer to execute a process, the process including acquiring a target characteristic value of a target antenna when a value of a structure parameter is a predetermined value, based on the predetermined value of the structure parameter, the target characteristic value, and a relation, with respect to a reference antenna, between a value of a structure parameter and a characteristic value, estimating the relation with respect to the target antenna, the reference antenna having a same shape feature as the target antenna, an antenna type of the reference antenna being different from the target antenna, determining a value of the structure parameter for the target antenna such that the characteristic value of the target antenna satisfies a demanded specification based on the estimated relation, and outputting the determined value of the structure parameter.
摘要:
An antenna apparatus includes a first ground plane (20); a second ground plane (30) having first, second, third and fourth sides, a cutout part, and a slit (40) having an open end (41); a first radiating element (110) having first and second lines, and a feeding point (115); a second radiating element (120) having a third line; and a parasitic element (130) having first and second parasitic lines. A length from the feeding point to an end part of the slit is set to one-half wavelength at a first communication frequency, a total length of a length from an end part of the fourth line to the feeding point, and a length from a ground potential point (38) to an end part of the second parasitic line is set to one-half wavelength at a second communication frequency, and a length of the third line and the fourth line is set to one-quarter wavelength at a third communication frequency.