Abstract: A variable directivity slot antenna includes: ground conductors 101a and 101b, which are divided by a slot region 109 both of whose ends are open ends 111a and 111b; a feed line 115 having a loop shape at a feeding site 113 for the slot region 109; a first selective conduction path 119 connecting between the ground conductors 101a and 101b in a direction of the open end 111a as viewed from the feeding site 113; and a second selective conduction path 121 connecting between the ground conductors 101a and 101b in a direction of the open end 111b as viewed from the feeding site 113. Depending on the driving state, the first selective conduction path 119 and the second selective conduction path 121 are controlled into a conducting or open state.

Abstract: A wireless communication device is configured to provide wireless communication to a host device when disposed in a mated position in a slot having a primary axis and formed in a side face of the host device. The wireless communication device includes a transceiver, a controller in communication with the transceiver, and a modem in communication with the controller. The wireless communication device also includes a balanced antenna in communication with the transceiver and having a polarization axis that is parallel to the side face and to the primary axis of the slot when the wireless communication device is in the mated position.

Abstract: Impedance matching is achieved in a waveguide of a slot antenna, which is provided with an input waveguide that is fed power via an aperture plane; a stairway structure is provided in the input waveguide; the structure creates a step going upward toward a surface provided with a slot; the step difference and height of the step going upward are adjusted so that the impedance at a plane above the step and the impedance at the aperture plane match.

Abstract: A phased array antenna adapted to be mounted in a helmet. In the illustrative embodiment, the antenna comprises a substrate and an array of radiating elements disposed on said substrate, each of the elements including a-resonant cavity and a mechanism for feeding the cavity with an electromagnetic signal., The cavity is formed in a multi-layer structure between a ground plane and a layer of metallization. A radiating slot or slots are provided in the layer of metallization. A first layer of dielectric material is disposed within the cavity. The feed mechanism is a microstrip feed disposed in the first layer of dielectric material parallel to a plane of a portion of the substrate over which an associated element is disposed. A layer of foam is disposed between the layer of dielectric material and the ground plane. Second and third parallel layers of dielectric material are included in each element. The second layer is disposed adjacent to the ground plane.

Abstract: With a differential feed line 103c, open-ended slot resonators 601, 603, 605, and 607 are allowed to operate in pair, a slot length of each slot resonator corresponding to a ¼ effective wavelength during operation. Slot resonators which are excited out-of-phase with an equal amplitude are allowed to appear within the circuitry. Thus, positioning condition of the open end points of the selective radiation portions 601b, 601c, 603b, 603c, 605b, and 607b in the respective slot resonators is dynamically switched.

Abstract: A wireless communication device and method for identifying a container, or communication information about a container using a slot in the container as an antenna. The device includes a wireless communication device for transmitting information regarding the container. The container includes an outer wall forming rim and a slot between the rim edge and the outer wall that is circular and continues without boundaries. The wireless communication device is coupled to the slot to provide the slot antenna for communications. An impedance matching network is additionally provided to make the operating frequency of the slot substantially the same as the operating frequency of the wireless communication device. Alternatively, shorting posts may be placed in the slot to define boundaries of the slot to match the operating frequency of the slot to the operating frequency of the antenna. Multiple feed points may be provided between the wireless communication device and the slot.

Abstract: Opposite ends open slot resonators (601, 605) having a slot length during an operation set to become one half of effective wavelength are operated by a differential feeder liner (103c) and a slot resonator group excited with a reverse phase/equal amplitude is made to emerge in the circuit, and arrangement conditions of the open end points of selective radiation parts (601b, 601c, 603b, 603c, 605b, 605c, 607b, 607c) in each slot structure are switched dynamically.

Abstract: This invention relates to a radiating element 20 for use in array antennas. The radiating element 20 is of simplified design and comprises a front region 26 and a rearward region 28 that are preferably substantially rectangular, which permit higher frequency limits than more conventional Vivaldi elements while maintaining the lower frequency limit. Additionally, by deployment of an array of a plurality of such elements 20 such that no gaps are formed between adjacent elements 20 along the array antenna, very wide bandwidth can be obtained using the array.

Abstract: An antenna device (AD) for a RF communication equipment, comprises i) a substrate (S) comprising front (FS) and back (BS) sides, ii) a planar antenna element (AE) fixed to the substrate back side (BS), iii) a group of at least one component (G1) fixed to the substrate front side (FS), in an area located under the antenna element (AE), and connected to the antenna element (AE) through at least a first connecting means (VH 1) passing through the substrate (S), and a low resistivity layer (BL) buried into the substrate (S) for connecting to ground in order to isolate at least the group of component(s) from electromagnetic disturbances induced by the antenna element (AE).

Abstract: A high gain, phased array antenna includes a conducting sheet having a number of one or more slots defined therein. For each slot, an electrical microstrip feed line is electronically coupled with a corresponding slot to form a magnetically-coupled LC resonance element. A main feed line couples with the one or more microstrip feed lines. At least one slot and/or microstrip feed line includes at least one segment with greater width than other segments.

Abstract: The specification discloses a slot antenna in which the slot opens through an edge of the conductor. Preferably, the slot is nonlinear (e.g. a zigzag shape) enabling a compact configuration in which a relatively long slot is configured in a relatively small conductor.

Abstract: A Tapered Slot Antenna Cylindrical Array (NC#97194). The apparatus includes a base and a tapered slot antenna array. The base is capable of retaining a plurality of tapered slot antenna pairs. The tapered slot antenna array is operatively coupled to the base in a cylindrical configuration. The tapered slot antenna array comprises at least two tapered slot antenna pairs. Each tapered slot antenna pair of the at least two tapered slot antenna pairs is capable of operating independently of or in conjunction with other tapered slot antenna pairs of the at least two tapered slot antenna pairs to enable direction finding, acquisition, communication and electronic attack capabilities.

Abstract: A shunt antenna mountable on an aircraft comprises a lower plate, an antenna element formed above the lower plate and integrated within a dorsal fin of the aircraft where the antenna element is substantially slant relative to the lower plate; one or more couplers formed on the lower plate and operatively connected to a lower forward end of the antenna element. The couplers transmit radio frequency signals to the antenna element, and the antenna element and the lower plate are separated by air to produce a capacitor effect.

Abstract: A multiple frequency band antenna is provided that includes a radiating unit having a slot formed on a first surface of the substrate that is closed at one end and open at the other end, and a feed unit formed on a second surface of the substrate to pass through an area on the second surface that corresponds with the same area on first surface between the center and the closed side of the slot. The feeding unit comprises at least one switch which adjusts the size of an area for feeding power to the antenna. The radiating unit is resonated in a plurality of frequency bands when the switch is turned off, and the radiating unit is resonated in a single frequency band which is different from the plurality of frequency bands when the switch is turned on. Consequently, an antenna is implemented for use in multiple frequency bands.

Abstract: A new type of multihole antenna which is mainly suitable for mobile communications or in general to any other application where the integration of telecom systems or applications in a single antenna is important. The antenna includes a radiating element which at least includes one hole. By means of this configuration, the antenna provides a broadband and multiband performance, and hence it features a similar behaviour through different frequency bands. Also, the antenna features a smaller size with respect to other prior art antennas operating at the same frequency.

Abstract: An antenna comprising a layer of conductor having an edge, and a slot in the layer of conductor wherein conductor is absent, the slot having first and second opposing longitudinal ends and being opened to the edge at the first longitudinal end and not open to the edge at the second longitudinal end.

Abstract: A slot antenna apparatus includes a grounding conductor having an outer edge including a first portion and a second portion, a one-end-opened slot formed in the grounding conductor along a radiation direction such that an open end is provided at a center of the first portion, a first feed line intersecting with the slot to feed radio-frequency signals, a second feed line connected to an external circuit, and a signal processing circuit including active elements and connected between the first and second feed lines and connected to the grounding conductor. The grounding conductor is configured to be symmetric about an axis parallel to the radiation direction and passing through the slot, and is provided with a grounding terminal on the axis of symmetry at the second portion. The grounding terminal is to be connected to a ground of the external circuit.

Abstract: Handheld electronic devices are provided that contain wireless communications circuitry. The wireless communications circuitry may include an antenna. The antenna may be formed from a ground plane having a dielectric-filled slot that defines a slot antenna structure and having a planar-inverted-F (PIFA) resonating element located above the opening. The slot antenna structure and the PIFA resonating element may both contribute to the performance of the antenna, so that the antenna exhibits the performance of a hybrid PIFA-slot antenna. The PIFA resonating element may contain multiple antenna resonating element branches. The branches may be configured to operate in different communications bands than the slot antenna structure.

Abstract: A corner reflector antenna includes a ground plate having a main surface, a reflector including a rectangular first metal plate and a rectangular second metal plate which are perpendicularly provided on the main surface of the ground plate, the first and second metal plates being combined together to form a prescribed angle, a radiator including a rectangular third metal plate perpendicularly provided on the main surface, at a position where the angle is divided in half, the third metal plate including a first edge which is opposite the main surface, the first edge having a plurality of first cutouts, and a second edge which is opposite the reflector, the second edge having a second cutout extending toward the reflector, and a first feeding point and a second feeding point provided on respective sides of the second cutout on the third metal plate in the vicinity of the second edge.

Abstract: A slot antenna is provided. The slot antenna includes a feeding unit of a strip line shape which is disposed on a first surface of a substrate, a ground which is disposed on a second surface of the substrate, and an antenna element which is formed by connecting two sub slots formed on the second surface of the substrate, wherein each of the sub slots is arranged at an edge of the ground in an internal direction of the ground. Accordingly, the size of the antenna is reduced, and more area is provided for arranging components of a terminal.

Abstract: A planar antenna structure is provided. The planar antenna includes a dielectric substrate, a ground plane, a first conductive pattern and a second conductive pattern. The dielectric substrate has a first surface and a second surface. The ground plane is on the second surface of the dielectric substrate. The first conductive pattern is on the first surface of the dielectric substrate, coupled to a feeding line. The second conductive pattern is on the second surface of the dielectric substrate, coupled to the ground plane. The first and second conductive patterns are coupled to serve as cascaded right- and left-handed transmission lines. The first and second conductive patterns include: a first lumped equivalent circuit of the right-handed transmission line; and a second lumped equivalent circuit of the left-handed transmission line, cascaded with the first lumped equivalent circuit, wherein the right- and left-handed transmission lines have electrical lengths with opposite signs respectively.

Abstract: In accordance with one embodiment of the present invention, an antenna assembly comprising an antenna portion and an electrooptic waveguide portion is provided. The antenna portion comprises at least one tapered slot antenna. The waveguide portion comprises at least one electrooptic waveguide. The electrooptic waveguide comprises a waveguide core extending substantially parallel to a slotline of the tapered slot antenna in an active region of the antenna assembly. The electrooptic waveguide at least partially comprises a velocity matching electrooptic polymer in the active region of the antenna assembly. The velocity ?e of a millimeter or sub-millimeter wave signal traveling along the tapered slot antenna in the active region is at least partially a function of the dielectric constant of the velocity matching electrooptic polymer.

Abstract: A planar antenna assembly comprises a Planar Inverted F Antenna mounted on a printed circuit board (PP) and comprising i) a radiating element (RE1, RE2) comprising first (RE1) and second (RE2) parts approximately perpendicular one to the other and being respectively located in a first plan facing and parallel to a ground plane mounted on a face of the printed circuit board (PP) and in a second plane perpendicular to said ground plane, ii) a feed tab (FT) extending from said second part (RE2) to said printed circuit board (PP), and iii) a main slot (SO1) having a chosen length and comprising a linear part (LP) defined in the second part (RE2) at a chosen location between lateral sides of the radiating element (RE1, RE2) and a meandered part (MP) extending the linear part (LP) into the first part (RE1).

Abstract: A variable directivity slot antenna includes: ground conductors 101a and 101b, which are divided by a slot region 109 both of whose ends are open ends 111a and 111b; a feed line 115 having a loop shape at a feeding site 113 for the slot region 109; a first selective conduction path 119 connecting between the ground conductors 101a and 101b in a direction of the open end 111a as viewed from the feeding site 113; and a second selective conduction path 121 connecting between the ground conductors 101a and 101b in a direction of the open end 111b as viewed from the feeding site 113. Depending on the driving state, the first selective conduction path 119 and the second selective conduction path 121 are controlled into a conducting or open state.

Abstract: The present invention employs slot antennas to make UWB antenna and a quarter-wavelength slot UWB antenna for use in mobile terminals. The slot length, which is related to the lower resonant frequency, is about half (for the half-wavelength slot antenna) or quarter (for the quarter-wavelength slot antenna) of the wavelength, while the higher resonant frequency is related to a dimension of the tuning stub. By modifying the dimensions of the tuning stub, good impedance matching of the antenna can be achieved according to the desired operating frequency. This invention can be used for mobile terminals to transmit and receive UWB signals in the frequency range of 3.1 GHz-4.9 GHz.

Abstract: A card data storage device with detector plate is described. The detector plate consists of a chip and a coupling loop inductively linked with the chip, wherein the coupling loop completely or partially surrounds an electrically non-conducting region of the card data storage device.

Abstract: A terminal is provided for selectively communicating in at least two frequency bands. The terminal includes an antenna transducer including a first port and a second port, where the antenna transducer is capable of selectively transducing first radio signals (e.g., low power radio frequency (LPRF) signals) to and/or from the first port, and/or second radio signals (e.g., global positioning system (GPS) signals) to and/or from the second port. In this regard, the antenna transducer is capable of transducing first radio signals such that an impedance at the second port approaches a short circuit or an open circuit, and capable of transducing second radio signals such that an impedance at the first port approaches an open circuit. An associated communication assembly and method for selectively communicating in at least two frequency bands are also provided.

Abstract: The present invention discloses an antenna adapted for use in a wireless network device. The antenna includes: a base radiation portion, a connecting portion, a first radiation portion and a second radiation portion. The connecting portion is connected with the base radiation portion and has a slot with two slot sides that are spaced with a first width. The first radiation portion is connected with the connecting portion. The second radiation portion is connected with the first radiation portion, substantially parallel to the connecting portion, and is positioned corresponding to the slot. The second radiation portion has two edges that are spaced with a second width. When the second radiation portion is projected onto the connecting portion along a direction perpendicular to the second radiation portion, one of the edges and one of the corresponding slot sides are spaced with a distance.

Abstract: An integrated module of antenna and connector has an insulative housing receiving a plurality of conductive terminals therein, a metal shell shielding the insulative housing, and a coupling device assembled on the metal shell. The metal shell is grounded and defines a slot with a particular shape. A feed-in terminal is provided on a side of the slot and includes a soldering portion and a contact portion. The soldering portion of the feed-in terminal connects with a circuit board. The coupling device contacts the contact portion of the feed-in terminal, feeding in high-frequency voltage which forms voltage difference relative to a plane of the slot. A resonant electromagnetic field is produced in the slot for working as an antenna for electromagnetic wave radiation. Thus, functions of an antenna and a connector are combined, reducing the occupied space and decreasing the cost.

Abstract: A multi-band antenna has a radiating conductor, a feeding conductor and a short conductor. The feeding conductor and the short conductor connect to one side of the radiating conductor, which are arranged close to each other. The radiating conductor has a slot containing an opening portion, a first extension portion and a second extension portion communicating with each other. The opening portion opening at the other side of the radiating conductor and the first and second extension portions extend to different directions. The second extension portion defines a short portion on the radiating conductor. The multi-band antenna is divided by the slot to form an inverted-F portion being similar to an inverted-F antenna to resonate at a first frequency band, and a loop portion being similar to a loop antenna to resonate at a second frequency band.

Abstract: The present invention relates to an integrated circuit package comprising at least one substrate, each substrate including at least one layer, at least one semiconductor die, at least one terminal, and an antenna located in the integrated circuit package, but not on said at least one semiconductor die. The conducting pattern comprises a curve having at least five sections or segments, at least three of the sections or segments being shorter than one-tenth of the longest free-space operating wavelength of the antenna, each of the five sections or segments forming a pair of angles with each adjacent segment or section, wherein the smaller angle of each of the four pairs of angles between sections or segments is less than 180° (i.e.

Abstract: Antenna and its improved framework for soldering electric wire is disclosed, comprising: an antenna comprising a radiator, a grounding electrode and a connection portion which connects the radiator and the grounding electrode and which is provided with a slit, and a soldering zone provided on the radiator and the grounding electrode of the respective side of the slit to couple with an electric wire; and an anti-soldering material provided on the soldering zone. Compared with the conventional prior art, the antenna and its improved framework for soldering electric wire provided with anti-soldering material in the soldering zone of the antenna can accurately position the solder to avoid uncontrolled diffusion of solder, reduce satisfactory soldering, and increase signal transmission stability to render the operation simple and easy.

Abstract: The wireless communication device contains at least one conductive tab that provides an antenna. The tab(s) form a pole antenna, and the tabs may also be attached across a slot to form a slot antenna. The tab(s) may be attached across a slot created in a package to form a slot antenna, or the tab(s) may be attached to a slot that is created as part of the wireless communication device to form a slot antenna. The tab(s) and/or the slot may also contain an adhesive material to attach the wireless communication device to a package, container or other material. More than one slot may be provided to form a circularly polarized antenna. The carrier may be a conductive material in which tabs are formed as part of the carrier before the wireless communication device is attached. The wireless communication device may have an asymmetrical antenna arrangement.

Abstract: A slot antenna apparatus including: a grounding conductor having an outer edge including a first portion facing a radiation direction and a second portion other than the first portion, a one-end-open slot formed in the grounding conductor along the radiation direction such that an open end is provided at a center of the first portion, and a feed line including a strip conductor close to the grounding conductor and intersecting with the slot at least a part thereof to feed a radio frequency signal to the slot. The grounding conductor is formed to include at least one section at the second portion, the at least one section gradually approaches an axis passing through the slot and parallel to the radiation direction with increasing distance from the first portion.

Abstract: The present invention relates to an antenna arrangement for a portable communication device as well as to a portable communication device comprising such an antenna arrangement. The antenna arrangement includes a ground plane, a first radiating electrical antenna element provided in a plane arranged at a distance above and parallel with at least a part of the ground plane, where the first radiating electrical antenna element is dimensioned for resonating at least at one frequency, and a second radiating magnetic antenna element provided in the ground plane below the first antenna element and being dimensioned for resonating at the same frequency as the first radiating antenna element.

Abstract: A portable radio communication apparatus is provided with a boom portion having both ends connected with a housing of the portable radio communication apparatus and having a central portion located between both ends. In the portable radio communication apparatus, at least one through hole is formed between the boom portion and the housing. The boom portion includes a central portion and two end portions. The central portion extends in parallel to a width direction of the portable radio communication apparatus, and the two end portions are bent respectively from both ends of the central portion.

Abstract: A slot antenna apparatus includes a grounding conductor having an outer edge including a first portion facing a radiation direction and a second portion other than the first portion, a one-end-open feed slot formed in the grounding conductor along the radiation direction such that an open end is provided at a center of the first portion, and a feed line including a strip conductor close to the grounding conductor and intersecting with the feed slot at at least a part thereof to feed a radio frequency signal to the feed slot. The slot antenna apparatus further comprises at least one one-end-open parasitic slot having an electrical length equivalent to one-quarter effective wavelength in a certain stop band, the parasitic slot having an open end at the second portion, and being formed in the grounding conductor so as not to intersect with the feed line.

Abstract: With a differential feed line 103c, open-ended slot resonators 601, 603, 605, and 607 are allowed to operate in pair, a slot length of each slot resonator corresponding to a ¼ effective wavelength during operation. Slot resonators which are excited out-of-phase with an equal amplitude are allowed to appear within the circuitry. Thus, positioning condition of the open end points of the selective radiation portions 601b, 601c, 603b, 603c, 605b, and 607b in the respective slot resonators is dynamically switched.

Abstract: Embodiments relate generally to a body wearable antenna configuration comprising of a flexible multi-layered structure. Each layer has a property that contributes to the overall response of the antenna. The properties of each layer optimized to give the best overall response of the antenna.

Abstract: A variable slot antenna includes: ground conductors 101a and 101b, which are divided by a slot region 109 both of whose both ends are open ends 111a and 111b; a feed line 115 for feeding power to the slot region 109; a first selective conduction path 119 connecting between the ground conductors 101a and 101b in a direction of the open end 111a as viewed from a feeding site 113; and a second selective conduction path 121 connecting between the ground conductors 101a and 101b in a direction of the open end 111b as viewed from the feeding site 113. In a first driving state, the first selective conduction path 119 is allowed to conduct and the second selective conduction path 121 is left open, so that a main beam is emitted in a direction 123a of the second selective conduction path 121 as viewed from the feeding site 113. In another driving state, the selective conduction paths are controlled differently so that the main beam direction is switched to a direction 123b.

Abstract: A wideband slot antenna according to the present invention is a ¼ effective wavelength slot antenna in which a ground conductor 103 having a finite area is allowed to function as a dipole at lower frequencies. An inductive region 123 is provided within an feed line 113 in a region intersecting a slot 111, and an antenna feed point 117 for connection to an external unbalanced feed circuit is provided at a position which satisfies high impedance conditions for an unbalanced ground conductor current.

Abstract: A method for making a horn antenna array includes the steps of making planar boards with surface conductor or metallization defining a plurality of side-by-side horns, and with horn feed conductors extending to an edge of the boards. The edges of the board are metallized in a pattern to define feed pads in contact with the feed conductors. Slots are cut in the boards on the axes of the horns so that two orthogonal boards can be joined together for “radiation” in mutually orthogonal planes. A surface-conducive dielectric support defines surface pads in a pattern that matches the pattern of feed pads in a set of joined boards, and through vias connect from the surface pads to lower layers, which may include a beamformer, for making individual connections to the horns.

Abstract: A slot antenna for short-range communications between wireless communication devices is described herein. The antenna comprises a radiating plate spaced from a ground plate. A slot in the radiating plate defines the resonant frequency of the antenna. A spiral feed element disposed beneath the slot and between the ground plate and the radiating plate feeds transmission signals to the antenna. The slot antenna may be used in any portable wireless communication device configured to transmit short-range wireless signals, such as Bluetooth® signals.

Abstract: An antenna comprises a first metal element, a second metal element, a third metal element, a ground element and a cable. The first metal element and the second metal element are connected to the ground element. The third metal element is disposed on the first metal element. The cable is coupled to the first metal element. The antenna has three different resonant frequencies (a first resonant frequency, a second resonant frequency and a third resonant frequency) for transmitting three signals in different frequency bands.

Abstract: A printed antenna disposed on a substrate, includes a radiation part, a feed line, and at least one first ground part. The radiation part is for radiating and receiving electromagnetic signals, and includes a hollow portion and a pair of openings. The hollow portion is defined in the radiation part, and comprises a first slot connected to a second slot, which is connected to a third slot, wherein the second slot extends between the first slot and the third slot forming a substantially h-shaped pattern. The openings are formed at two edges of the radiation part. The feed line for feeding the electromagnetic signals to the radiation part is electrically connected to the radiation part. The at least one first ground part for grounding is disposed at one side of the feed line.

Abstract: In accordance with one embodiment of the present disclosure, methods and systems for radiating elements are provided. In a method embodiment, a method of forming a radiating element includes forming a pair of conductive fingers having first and second portions. The first portion is a dipole arm. The conductive fingers are separated by a tapered notch that has a width at a first end that is less than a width of a second end. For each conductive finger, the method also includes capacitively coupling the first portion of the conductive finger to the second portion of the conductive finger.

Abstract: An antenna arrangement comprising a multi-layer PCB (10) with a ground plane (20) in a first layer and a first antenna (11) in a second layer, and an extended ground plane (20) connected to the ground plane of the PCB. A second antenna (110, 120, 130, 140, 150) is formed integral with the extended ground plane (20). The extended ground plane is positioned opposite the first antenna.

Abstract: A planar antenna includes first and second radiation elements. A first partial periphery of the first radiation element and a second partial periphery of the second radiation element face each other at a uniform gap equal to or less than a tenth of the length of the first partial periphery. The first radiation element includes a third partial periphery parallel to a straight line for connecting the both ends of the first partial periphery, a feeding point at a central portion of the first partial periphery, and a slit having an opened end and a closed end. A distance from the feeding point to the opened end along the slit through the closed end is longer than a sum of a half of the first partial periphery and a longer one of the other two partial peripheries.

Abstract: A wireless communication device and method for identifying a container, or communication information about a container using a slot in the container as an antenna. The device includes a wireless communication device for transmitting information regarding the container. The container includes an outer wall forming rim and a slot between the rim edge and the outer wall that is circular and continues without boundaries. The wireless communication device is coupled to the slot to provide the slot antenna for communications. An impedance matching network is additionally provided to make the operating frequency of the slot substantially the same as the operating frequency of the wireless communication device. Alternatively, shorting posts may be placed in the slot to define boundaries of the slot to match the operating frequency of the slot to the operating frequency of the antenna. Multiple feed points may be provided between the wireless communication device and the slot.

Abstract: A dual-band antenna (10) is provided. The dual-band antenna printed on a substrate (30) includes a transmission portion (120), a first radiator (140), a second radiator (160), a first grounded portion (180), and a second grounded portion (190). The transmission portion is used for feeding electromagnetic signals. The first radiator is electronically connected to the transmission portion for transceiving electromagnetic signals with a first frequency. The second radiator is electronically connected to the transmission portion for transceiving electromagnetic signals with a second frequency. The first grounded portion is disposed on a first surface of the substrate. The second grounded portion is disposed on a second surface of the substrate. A length of the second grounded portion is greater than that of the first grounded portion. An antenna assembly is also provided in the present invention.