摘要:
A washer 31 is mounted on a cable 20 at one end portion 21 and the washer 31 is staked to a skin of the cable 20. The skin of the cable 20 is coated with polytetrafluoroethylene or PTFE. The washer 31 is made of brass. Subsequently, a bushing member 32 is integrally molded on the washer 31 to the cable 20 by injection molding. The bushing member 32 is made of polyvinyl chloride or PVC. Thereby, a cable bush 30A is mounted on the cable 20 with cable bush 30A securely fixed to the cable 20.
摘要:
In a patch antenna including a dielectric having a top surface, a bottom surface, and a side surface, a radiation element formed on the top surface of the dielectric, and a ground conductor formed on the bottom surface of the dielectric, a ring-shaped non-feeding element is formed on the side surface of the dielectric. The non-feeding element preferably may be formed on the side surface of the dielectric in the vicinity of the top surface of the dielectric. In addition, the non-feeding element may be formed by pasting a copper tape or by thick film printing.
摘要:
In a monopole antenna, an antenna element is fitted into a dielectric body having a predetermined relative dielectric constant. A wavelength of a propagation wave is shortened by the shortening coefficient of wavelength which corresponds to the predetermined relative dielectric constant of the dielectric body. In this case, the antenna length of the antenna element can be shortened, so as to be equal to the shortened wavelength of 1/n of the shortened wavelength, “n” being integer. Thus the monopole antenna is small-sized.
摘要:
In order to transmit a signal received in a GPS antenna (20) to a GPS receiver body (30) through a glass plate (40), a signal transmission circuit (10) is divided into first and second signal transmission parts (11, 12). The first signal transmission part (11) is for transmitting a high frequency signal from an output terminal (20out) of the GPS antenna (20) to a first surface (41) of the glass plate (40). The second signal transmission part (12) is for transmitting the high frequency signal from a second surface (42) of the glass plate (40) to an input terminal (30in) of the GPS receiver body (30). The first signal transmission part (11) includes a first coaxial cable (111), a first electrode pair (112), a first balanced line (113), and a first balun (114). The second signal transmission part (12) includes a second coaxial cable (121), a second electrode pair (122), a second balanced line (123), and a second balun (124).
摘要:
In a helical antenna comprising a hollow cylindrical member having an inner peripheral surface and an outer peripheral surface and an antenna pattern film wound around the outer peripheral surface of the hollow cylindrical member, the helical antenna further comprises a center rod coaxial with a center axis of the hollow cylindrical member and at least three ribs disposed between the center rod and the inner peripheral surface of the hollow cylindrical member. The ribs symmetrically extends in a radial manner at equal angular intervals. The hollow cylindrical member, the center rod, and the ribs preferably may be integrally molded out of plastic. The antenna pattern film may comprise a flexible insulator film and a conductive pattern formed on the flexible insulator film. The conductive pattern has at least one antenna lead member which is wound around the outer peripheral surface of the hollow cylindrical member in a helix fashion.
摘要:
To provide an antenna unit that can always provide good broadcast transmission reception and a signal switching circuit to be used therein. A first antenna element for receiving satellite broadcast transmissions, a second antenna element for receiving VHF terrestrial broadcast transmissions, and a switching means for selectively switching output of either a reception signal of the satellite broadcast transmissions received by the first antenna element or a reception signal of the VHF terrestrial broadcast transmissions received by the second antenna element and supplying that output to the receiver unit via the signal supply cable in response to a direct-current bias level supplied from a receiver unit via a signal supply cable are provided inside a single identical casing.
摘要:
A shield casing including a metal shield casing body covering a circuit board to which a electrical cable is connected, the shield casing body including a top portion, side walls and an opened bottom portion, a cable introduction portion formed by partly notching one of the side walls, the electrical cable being introduced into the cable introduction portion in parallel with the top portion, and a contact piece extending perpendicularly from the top portion towards the bottom portion and positioned above the cable introduction portion, the electrical cable being welded on the contact portion by soldering.
摘要:
An antenna device includes an antenna, the antenna including an antenna element, a circuit board, and a planar metallic holder disposed between the antenna element and the circuit board. The antenna device further includes an antenna case accommodating the antenna, and the antenna case include a top cover and a bottom plate serving as a base. The metallic holder supports the antenna element on the base, and includes a flat-shaped portion mounting a bottom surface of the antenna element and a plurality of tabs extending upwards from peripheral edges of the flat-shaped portion. The plurality of tabs includes a pair of front tabs and a pair of rear tabs, and a distance between the pair of front tabs is shorter than a distance between the pair of rear tabs.
摘要:
Disclosed is an antenna apparatus, including: a multi-layer substrate having at least two substrates in a stacking manner and having a first through hole; an amplifying circuit on one face of the multi-layer substrate; a ground pattern formed between two adjacent substrates of the multi-layer substrate; an antenna pattern formed on the other face of the multi-layer substrate; and a first comb electrode having comb teeth and a second comb electrode having comb teeth, both of which are formed around the antenna pattern on the other face of the multi-layer substrate. The first comb electrode is electrically connected to the antenna pattern. The second comb electrode is electrically connected to the ground pattern through the first through hole. The comb teeth of the first comb electrode and the comb teeth of the second comb electrode are spaced from one another at predetermined intervals in a staggered manner.