A first edge of a ground plane extends in a first direction. A radiating element is arranged with a gap from the ground plane in a thickness direction of the ground plane. A feed line supplies a radio frequency signal to the radiating element. A pair of stubs are arranged at positions sandwiching the radiating element in the first direction. The stub is connected to the ground plane. In plan view, a distance from the radiating element to the first edge in a second direction orthogonal to the first direction is ¼ or less of a wavelength corresponding to a resonant frequency of the radiating element. Even when the radiating element is arranged close to an edge of the ground plane, disorder of a beam pattern may be reduced.

An array antenna includes a flexible substrate formed by stacked liquid crystal polymer (LCP) layers and has at least one feed point. At least one serial antenna is arranged on the flexible substrate, and a microstrip is extended from the feed point to connect a plurality of radiating elements in series to form the serial antenna. The tail end one of the radiating elements of the serial antenna is connected to one end of a ground microstrip, and another end of the ground microstrip is short-circuited to the ground. The length of the ground microstrip is approximately one fourth of the wavelength of the center frequency of the array antenna. Feeding sections where microstrips feeding to the radiating elements are in a horn and/or groove shape. Desired frequency and bandwidth may be obtained by adjusting lengths and widths of feeding sections respectively.

An array antenna includes a flexible substrate formed by stacked liquid crystal polymer (LCP) layers and has at least one feed point. At least one serial antenna is arranged on the flexible substrate, and a microstrip is extended from the feed point to connect a plurality of radiating elements in series to form the serial antenna. The tail end one of the radiating elements of the serial antenna is connected to one end of a ground microstrip, and another end of the ground microstrip is short-circuited to the ground. The length of the ground microstrip is approximately one fourth of the wavelength of the center frequency of the array antenna. Feeding sections where microstrips feeding to the radiating elements are in a horn and/or groove shape. Desired frequency and bandwidth may be obtained by adjusting lengths and widths of feeding sections respectively.

An electronic device may comprise: a display; an antenna module including at least one antenna; a conductive connection member comprising a conductive material; and at least one antenna structure. The display may be arranged in the inner space of a housing to be visible from the outside and may include a curved side surface portion. The antenna module may be arranged in the inner space of the housing. The conductive connection member may be electrically connected to the antenna module. The at least one antenna structure may be arranged on a side surface portion of the display. The conductive connection member may electrically connect the antenna structure to the antenna module. The antenna structure may include at least one first-type antenna and at least one second-type antenna configured to radiate radio waves in different directions.

A planar antenna device includes: a dielectric; an antenna layer provided on one main surface of the dielectric; and a ground layer provided on an other main surface of the dielectric to oppose the antenna layer. The planar antenna device generates an electric field in a first direction along the other main surface by radiating radio waves with linear polarization from the antenna layer. The ground layer includes a grid-like ground electrode portion and a plurality of openings positioned in regions other than the ground electrode portion, each of the plurality of openings being quadrilateral in shape. Each of the plurality of openings includes two first opening sides parallel to the first direction and two second opening sides perpendicular to the first direction. A length of each of the first opening sides is longer than a length of each of the second opening sides.

An antenna device includes: a patch conductor provided on a substrate; a GND conductor provided in the substrate in such a manner as to face the patch conductor; GND pins that are provided in the substrate and that connect the patch conductor and the GND conductor; and an RF circuit provided on a first face of the patch conductor opposite to a second face of the patch conductor, the second face being attached to the substrate, the RF circuit being provided in such a manner as to be surrounded by the GND pins.

An antenna is disclosed. The antenna can include a coplanar antenna structure. The coplanar antenna structure can include a substrate and a radiating portion that is configured to emit electromagnetic radiation and is disposed over the substrate. The radiating portion defines a slot having a width to length ratio of at least approximately 0.4. The antenna also includes a scattering element disposed over the substrate and at least partially surrounds the radiating portion.

The insertion loss of a multilayer substrate and an antenna element is reduced. A multilayer substrate according to an embodiment of the present disclosure includes a multilayer body, a wire conductor, and a first ground electrode. The multilayer body is formed by dielectric layers being layered. The wire conductor is formed in the multilayer body, and a radio frequency signal passes through the wire conductor. The first ground electrode is formed in or on the multilayer body and includes a first surface that faces the wire conductor. The first surface includes a first region and a second region. The surface roughness of the first region is lower than the surface roughness of the second region. The first region overlaps at least part of the wire conductor in plan view in a direction normal to the first ground electrode.

The insertion loss of a multilayer substrate and an antenna element is reduced. A multilayer substrate according to an embodiment of the present disclosure includes a multilayer body, a wire conductor, and a first ground electrode. The multilayer body is formed by dielectric layers being layered. The wire conductor is formed in the multilayer body, and a radio frequency signal passes through the wire conductor. The first ground electrode is formed in or on the multilayer body and includes a first surface that faces the wire conductor. The first surface includes a first region and a second region. The surface roughness of the first region is lower than the surface roughness of the second region. The first region overlaps at least part of the wire conductor in plan view in a direction normal to the first ground electrode.

A mobile device supporting MIMO (Multi-Input and Multi-Output) includes a metal mechanism element, a metal sidewall, a first feeding element, a second feeding element, a third feeding element, and a fourth feeding element. The metal sidewall is coupled to the metal mechanism element. A first slot, a second slot, a third slot, and a fourth slot are formed on the metal mechanism element and the metal sidewall. A first antenna structure is formed by the first slot and the first feeding element. A second antenna structure is formed by the second slot and the second feeding element. A third antenna structure is formed by the third slot and the third feeding element. A fourth antenna structure is formed by the fourth slot and the fourth feeding element.