Abstract: A frequency tunable filter is disclosed. The disclosed filter comprises a filter unit having a sliding member so as to be capable of tuning a frequency band of a frequency signal being filtered; a communication module configured to receive a control signal for controlling the tuning of the frequency band; and a control unit configured to control the tuning of the frequency band by moving the sliding member based on the control signal. With the disclosed filter, the tuning of the filter may be performed automatically by way of control signals transmitted from a remote location.

Abstract: A radar antenna is disclosed. The disclosed antenna includes: a dielectric substrate; a feed line for feeding RF signals that is formed on an upper portion of the dielectric substrate and has a linear form; a multiple number of radiators that are perpendicularly joined to the feed line and have a bent structure comprising a horizontal portion and a vertical portion; a matching element for adjusting impedance matching that is joined to an end of the feed line; and a ground formed on a lower portion of the dielectric substrate, where a length of the horizontal portion and the vertical portion is set based on a polarization angle of an RF signal that is to be radiated. The disclosed antenna can be manufactured with a simple structure and a compact size.

Abstract: A radar array antenna using open stubs is disclosed. The disclosed antenna includes: a dielectric substrate; a feed line for feeding RF signals that is formed on an upper portion of the dielectric substrate and has a linear form; a multiple number of open stubs that extend at particular angles from the feed line and have linear forms with particular widths; a matching element for adjusting impedance matching that is joined to an end of the feed line; and a ground formed on a lower portion of the dielectric substrate, where the open stubs operate as radiators, and at least one of the open stubs has a different length for adjusting a radiation signal intensity of each open stub. The disclosed antenna can be manufactured with a simple structure and a compact size.

Abstract: A patch antenna is disclosed. The disclosed patch antenna may include: a first radiator configured to generate a circular polarized wave; a first dielectric substrate equipped under the first radiator; a second radiator, placed under the first radiator at a designated distance from the first radiator, and configured to generate a linear polarized wave; a second dielectric substrate equipped under the second radiator; and a reflecting plate equipped under the second radiator at a designated distance from the second radiator; where the first dielectric substrate, the second radiator, the second dielectric substrate, and the reflecting plate are connected through at least one via. A patch antenna according to the present invention has the advantages of being able to generate linear polarized waves and circular polarized waves simultaneously, and of having a small size while still having a high design frequency band.

Abstract: A patch antenna synchronously generating a circularly polarized wave and a linearly polarized wave comprises a first radiator radiating a circularly polarized wave with respect to an antenna signal, a first substrate provided at a part or the whole of the rear surface of the first radiator, a second radiator provided at a part or the whole of the rear surface of the first substrate and radiating a linearly polarized wave with respect to the antenna signal, and a second substrate provided at a part or the whole of the rear surface of the second radiator.

Abstract: Disclosed is a wide-band internal antenna that uses a slow-wave structure. The antenna includes an impedance matching/power feed part, which includes a first conductive element that extends from a power feed line and a second conductive element that is separated by a particular distance from the first conductive element and is electrically connected with a ground, and at least one radiator extending from the impedance matching/power feed part. Here, the first conductive element and the second conductive element of the impedance matching/power feed part form a slow-wave structure. By applying a slow-wave structure to coupling matching, the antenna provides the advantage of resolving the problem of narrow band characteristics found in inverted-F antennas while maintaining a low profile.

Abstract: A feeding system is provided, and it supplies a power using conductive patterns divided into pattern groups, e.g. patterns having U shape. The feeding system includes a first substrate, first patterns disposed on the first substrate, second patterns disposed on the first substrate, and connected electrically in parallel to the first patterns, a second substrate spaced from the first substrate, at least one third pattern disposed on the second substrate, and configured to correspond to the first patterns and one or more fourth pattern disposed on the second substrate, and configured to correspond to the second patterns. Here, the third pattern connects electrically corresponding first patterns, and the fourth pattern connects electrically corresponding second patterns.

Abstract: The present invention relates to a technology for forming a patch antenna generating both linearly and circularly polarized waves at the same time, so as to reduce a propagation loss during transmission/receiving operations between a circularly polarized antenna and a linearly polarized antenna.

Abstract: An antenna combined with a terminal housing is disclosed. The disclosed antenna includes an outer frame radiator, which is joined to a side wall of the terminal housing, and an inner frame radiator, which has one end joined to a first point on the outer frame radiator and the other end joined to a second point on the outer frame radiator, and which forms a loop by joining the outer frame radiator, where a feed signal is provided to the inner frame radiator. The disclosed antenna provides the advantages of preventing property changes caused by contact between a person's body and the terminal, and of minimizing mounting space while maintaining stable characteristics.

Abstract: An RF cavity filter is disclosed. The disclosed filter includes: a housing having at least one cavity defined; a cover coupled to an upper portion of the housing; at least one resonator contained within the at least one cavity; at least one hole formed in the cover; at least one grounding bolt configured to be inserted into the hole, having a screw thread formed on a part of an outer perimeter, and having a center hole in a center portion; and at least one tuning bolt inserted into the housing through the center hole along a screw thread formed on an inner perimeter of the center hole, where the grounding bolt has a flange part formed on a lower portion that is in contact with the tuning bolt and a lower portion of the cover.

Abstract: An antenna diversity system using an active antenna is disclosed. The disclosed system may include: a first antenna configured to transmit and receive a signal of a first frequency band; a second antenna configured to transmit and receive a signal of a second frequency band; and an active circuit unit implemented by active elements. In a first mode, the second antenna is operated as a passive antenna, and in a second mode, the second antenna is electrically connected to the active circuit unit and operated as an active antenna. The disclosed diversity system has the advantages of using a diversity antenna without increasing the size of a terminal, and of using an active antenna as a diversity antenna.

Abstract: A frequency tunable filter is disclosed. The disclosed filter comprises a filter unit having a sliding member so as to be capable of tuning a frequency band of a frequency signal being filtered; a communication module configured to receive a control signal for controlling the tuning of the frequency band; and a control unit configured to control the tuning of the frequency band by moving the sliding member based on the control signal. With the disclosed filter, the tuning of the filter may be performed automatically by way of control signals transmitted from a remote location.

Abstract: A multi-mode filter for realizing wide-band is disclosed. The multi-mode filter includes a housing; a plurality of cavities formed in the housing; a plurality of resonators located in each of the cavities; at least one connector formed through a side wall of the housing; and at least one coupling element connected to the at least one connector in the cavities, the at least one coupling element coupling the at least one connector with at least one of the resonators respectively, wherein each of the at least one coupling element has “T” shape in view of front section and “L” shape in view of side section.

Abstract: A multi-mode filter for realizing wide band using capacitive coupling and inductive coupling and capable of tuning coupling value is disclosed. The multi-mode filter includes a housing; a first cavity and a second cavity formed in the housing; a first resonator located in the first cavity, a second resonator located in the second cavity, a wall configured to separate the first cavity from the second cavity; and a first coupling element, wherein a groove is formed between the housing and the wall, the first coupling element is inserted in the groove in crossing direction to the wall, one part of the first coupling element is disposed in the first cavity, another part of the first coupling element is disposed in the second cavity, and the first coupling element is connected to a ground.

Abstract: Disclosed is a method for manufacturing an RF device. The method comprises the steps of (a) forming a metal sheet where interior structure of the RF device is formed; (b) attaching a plastic material housing to the formed metal sheet; and (c) performing silver plating on the RF device on which the plastic material housing is attached.

Abstract: An RF filter, e.g. RF cavity filter for adjusting coupling amount or transmission zero is disclosed. The RF filter includes a housing member in which cavities are defined by walls, resonators located in the cavities, a cover combined with an upper surface of the housing member, a first tuning element inserted into a first cavity of the cavities through the cover, and a second tuning element inserted into a second cavity of the cavities through the cover. Here, the first tuning element and the second tuning element are connected electrically.

Abstract: A feeding system for feeding power using slow wave structure is disclosed. The feeding system includes a first substrate, a first pattern disposed on the first substrate, being a conductor, a second substrate separated from the first substrate, and a second pattern configured to locate on the second substrate, being a conductor. Here, the first pattern and the second pattern are connected electrically, and at least one of the first pattern and the second pattern has a slow wave structure.

Abstract: A broadband internal antenna using double electromagnetic coupling is disclosed. The disclosed antenna may include: a first conducting member electrically connected to a feeding point; a second conducting member placed at a designated distance from at least a portion of the first conducting member so as to allow a first electromagnetic coupling with at least a portion of the first conducting member, and remaining in a floating state without being coupled to a ground and the feeding point; a third conducting member placed at a designated distance from the second conducting member so as to allow a second electromagnetic coupling with the second conducting member, and electrically connected to the ground; and a fourth conducting member extending from the third conducting member, for radiating RF signals. The disclosed antenna has the advantage of providing broadband characteristics within a limited size.

Abstract: A DC blocking device using impedance matching is disclosed. The disclosed DC blocking device comprises: a first strip line configured to receive a signal and including a first line section and a first joining section joined to a part where a signal is received; and a second strip line separated from the first strip line at a designated distance and including a second line section and a second joining section for joining an output signal, where coupling occurs from the first strip line to the second strip line, the first strip line and the second strip line each have at least one bending section, and the first line section and the second line section have smaller line widths than the first joining section and the second joining section. The disclosed DC blocking device has the advantage of minimizing spatial constraints when it is installed in a mobile communication apparatus, and of achieving proper coupling even if the length of the part of the DC blocking device where coupling occurs is reduced.

Abstract: An internal antenna for attaching to a terminal housing is disclosed. The antenna includes: a perpendicular structure formed in a perpendicular direction to a substrate and positioned in contact with an inner wall of a housing; a first conductive member electrically connected to a power feed and joined to the perpendicular structure to extend in a perpendicular direction to the substrate; and a second conductive member electrically connected to a ground, joined to the perpendicular structure, and separated by a particular distance from the first conductive member to extend in a perpendicular direction to the substrate. The first conductive member is joined to the inner wall of the housing to extend in a first direction orthogonal to the perpendicular direction, and the second conductive member is joined to the inner wall of the housing to extend in the first direction at a particular distance from the first conductive member.