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Petteri Annamaa, Seppo Ojantakanen, Seppo Raatikainen, Tero Haapamaki, Pekka Kinnunen, Kai Vuokko, Tero Kuittinen: Combined structure of a helical antenna and a dielectric plate. LK Products OY, Darby & Darby, November 23, 1999: US05990848 (120 worldwide citation)

The invention relates to a particular structure of high-frequency antenna, which comprises a support element (1) provided with a cylindrical coil conductor which forms a helix (2). On the support element (1) there is formed, for example by means of a conductive coating, the electrical parts of the a ...


2
Panu Hagstrom: Radio communications transceiver with integrated filter, antenna switch, directional coupler and active components. LK Products OY, Darby&Darby, May 11, 1999: US05903820 (91 worldwide citation)

The object of the invention is a radio communication transceiver, in which the low noise pre-amplifier and mixer of the receiver and the power amplifier, directional coupler and the mixer of the transmitter are integrated in connection with the filter section. The active components are integrated wi ...


3
Isohaetaelae Anne, Kivelae Sauli, Mikkola Jyrki, Tarvas Suvi: Planar dual-frequency antenna and radio apparatus employing a planar antenna. Lk Products Oy, July 12, 2000: EP1018779-A2 (81 worldwide citation)

A PIFA structure has a first operating frequency and a second operating frequency. It comprises a planar radiating element (801, 1002, 1101, 1203) which is a conductive area confined by a substantially continuous border line divided by a non-conductive slot (802). The slot has a first end on said su ...


4
Isohaetaelae Anne, Antila Kimmo, Kivelae Sauli, Mikkola Jyrki, Tarvas Suvi: Planar antenna with two resonating frequencies. Lk Products Oy, May 3, 2000: EP0997974-A1 (80 worldwide citation)

A planar antenna comprises a planar radiating element (600) formed of a conductive area confined by a substantially continuous border line. The conductive area is split by a gap which divides the planar radiating element into a first branch and second branch such that both the first and the second b ...


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Seppo Yrjola, Panu Hagstrom: Arrangement for separating transmission and reception. LK Products Oy, Darby & Darby, May 28, 1996: US05521561 (68 worldwide citation)

The present invention relates to an arrangement for separating transmission and reception accomplished through one and same antenna (A) in a transceiver, said arrangement comprising a filter and a switching element (K) and being provided with a common port to be coupled to the antenna (A), a transmi ...


7
Annamaa Petteri, Isohaetaelae Anne, Raatikainen Seppo, Antila Kimmo: Planar antenna. Lk Products Oy, July 28, 1999: EP0932219-A2 (68 worldwide citation)

An antenna for transmitting and receiving a radio frequency signal comprises a planar radiator (801, 901), a ground plane substantially parallel to the radiator, and a feed point (402, 602, 1106). Further it comprises a separate connector part (404, 604, 1105) for forming an electrical connection be ...


8
Jyrki Mikkola, Tommi Lepistö: Antenna for flat radio device. LK Products Oy, Darby & Darby, November 14, 2006: US07136019 (58 worldwide citation)

An antenna intended to be used in a small-sized and flat radio device, and to a radio device which has an antenna according to the invention. The base element of the antenna is a monopole-type conductor (110) internal to the device. This conductor may be designed such that the harmonic nearest to th ...


9
Heikki Korva, Petra Ollitervo: Multiband planar antenna. LK Products Oy, Darby & Darby P C, April 1, 2008: US07352326 (56 worldwide citation)

A multiband planar antenna intended for small-sized radio devices and a radio device. The basic structure of the antenna is a two-resonance P1FA, the radiating plane (320) of which has a structural part (321) corresponding to the lowest operating band and a structural part (322) corresponding to the ...


10
Aimo Turunen, Pauli Nappa: Ceramic band-pass filter. LK Products Oy, Darby & Darby, April 7, 1992: US05103197 (55 worldwide citation)

A dielectric filter is formed from a block of ceramic material with holes extending from a top surface toward a bottom surface. At least the bottom, both ends and one side surface are coated with conductive material. Also, the interior surfaces of the holes are coated with conductive material to for ...