Abstract:
La présente description concerne une sonde (10) de champ électromagnétique comprenant : - un plan de masse (12); - un toit capacitif (13); le plan de masse et le toit capacitif étant séparés par un matériau diélectrique (14); - au moins trois vias (110, 111, 112) s'étendant au travers du matériau diélectrique et comprenant au moins un via d'excitation et au moins un via de retour de masse agencés de manière à former, lorsque le au moins un via d'excitation est alimenté, deux boucles de courant, chaque boucle de courant s'étendant dans le plan du toit capacitif et dans une direction orthogonale audit toit capacitif, de sorte à être sensible à un champ magnétique (H1, H2) parallèle au plan du toit capacitif, les boucles de courant ayant des directions orthogonales l'une par rapport à l'autre dans le plan du toit capacitif.
Abstract:
An antenna for supporting a wireless system, which can in one example, be operable in two industrial, scientific and medical ("ISM") bands, may include a first radiator and a second radiator, and a single feed transmission section coupled to the first radiator and the second radiator. The antenna can, for example, be formed of a unitary planar structure. The antenna may be configured to fit within a chassis, which in one example, can be a chassis for a wireless receiver in a microphone.
Abstract:
A multi-band antenna having a tuned antenna element is disclosed. The multi-band antenna may simultaneously transmit a first radio frequency (RF) and a second RF signal. The antenna may include a driven antenna element to radiate the first RF signal and a parasitic element to radiate the second RF signal. The parasitic element may be coupled to a ground plane through a tuning circuit. The tuning circuit may modify a resonant wavelength of the parasitic element according to the second RF signal.
Abstract:
Systems and techniques are provided for a modified Vivaldi antenna with dipole excitation mode. An antenna may include a ground plane and a modified Vivaldi antenna. The modified Vivaldi antenna may include a straight arm with a first end and a second end, the first end being attached to the ground plane, a tapered section, and a balun placed partially between the straight arm and the tapered section. The modified Vivaldi antenna may be placed such that there is a gap between the tapered section and the ground plane. A feed element may be placed such that the feed element crosses the gap between the tapered section of the modified Vivaldi antenna and the ground plane.
Abstract:
A distributed multiband antenna intended for radio devices, and methods for designing manufacturing the same. In one embodiment, a planar inverted-F antenna (PIFA) configured to operate in a high-frequency band, and a matched monopole configured to operate in a low-frequency band, are used within a handheld mobile device (e.g., cellular telephone). The two antennas are placed on substantially opposing regions of the portable device. The use of a separate low-frequency antenna element facilitates frequency-specific antenna matching, and therefore improves the overall performance of the multiband antenna. The use of high-band PIFA reduces antenna volume, and enables a smaller device housing structure while also reducing signal losses in the high frequency band. These attributes also advantageously facilitate compliance with specific absorption rate (SAR) tests; e.g., in the immediate proximity of hand and head "phantoms" as mandated under CTIA regulations. Matching of the low-frequency band monopole antenna is further described.
Abstract:
A dual-resonance antenna reduced in size without deteriorating electric characteristics. The antenna comprises a first coil portion (21) and a second coil portion (23) wound helically and a connecting portion (22) extending downward from the upper end of the first coil portion (21) and through the first coil portion (21) generally along the center axis of the first coil portion (21). The lower end of the connection portion (22) is connected to the upper end of the second coil portion (23), to the lower end of which the electric power is supplied from a power supply unit (24).
Abstract:
A two-resonance antenna reduced in size without deteriorating electric characteristics. The antenna comprises a first coil portion (21) and a second coil portion (23) wound helically and a connecting portion (22) extending downward from the upper end of the first coil portion (21) and through the first coil portion (21) generally along the center axis of the first coil portion (21). The lower end of the connection portion (22) is connected to the upper end of the second coil portion (23), to the lower end of which the electric power is supplied from a power supply unit (24).
Abstract:
There is disclosed a meanderline loaded antenna comprising a ground plane, a plurality of vertical elements orthogonally affixed thereto, a driven vertical element affixed thereto and a horizontal element between the vertical elements. All but one of the plurality of vertical elements have an effective electrical length that is a quarter wavelength of the antenna operating frequency. Thus, these vertical elements represent an open and to not effect the antenna performance characteristics. One of the plurality of vertical elements will be operative and therefore the antenna length comprises the length of the operative element, the length of the driven element, and the length of the top plate therebetween.
Abstract:
The present invention relates to an antenna arrangement in a communication apparatus (8) for single, dual and/or multi-band frequency including at least two antenna elements (20, 30): a first antenna element (20) having a first (21) and a second end (22), and a second antenna element (30) having a first (31) and a second end (32). Said first and second elements (20, 30) are connected in series by connecting said first end (31) of the said second element (30) to said second end (22) of the said first element (20), which in at least some portion of its longitudinal direction is provided with a larger conductive material concentration (23) than the remaining parts.