JPS6016090Y2 - Communication antenna device for both horizontal and vertical polarization - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a horizontally and vertically polarized communication antenna device, and particularly relates to an antenna device that enables horizontal and vertically polarized communication using a monopole antenna as the main component. .

[Conventional technology]

In general, a monopole antenna is a vertically polarized antenna, but the person at the other end of the communication may not necessarily be using the same vertically polarized antenna, but may also be using a horizontally polarized antenna. Sensitivity decreases due to polarization.

[Purpose of invention]

In view of these points, the present invention aims to enable horizontal and vertical polarization communication with a simple structure mainly based on a monopole antenna (a telescopic multi-stage antenna may be used). The outer sheath of a double-sheathed coaxial cable extending horizontally is connected to the base of the vertically installed antenna element via a tuned balun circuit, thereby forming a dipole antenna capable of horizontal and vertical polarization communication. The present invention provides a communication antenna device for horizontal and vertical circular polarization.

〔Example〕

The present invention will be explained below with reference to the embodiments shown in the drawings. In FIGS. 1 and 2, a coil 2 is connected to the base of a vertical antenna element 1 of one water rod, and the end of this coil 2 is connected to a double-sheath coaxial Connected to the outer sheath of cable 3, with coil 2 in the middle
The coil 4 is connected to one end of the coil 4, which is arranged opposite to the coil 4.

As shown in FIG. 3, the double-sheath coaxial cable 3 has an outer cable 7 coaxially provided outside a central core wire 5 via an inner wire element 6, and has a length of /4 to λ/. 8 (λ: wavelength)
It has a length of about λ/4, which is almost the same as that of the antenna element 1, and extends straight in the horizontal direction at right angles to the antenna element 1.

Therefore, the end of the coil 2 is connected to the outer cable 7 corresponding to the outer jacket of such a double-sheathed coaxial cable 3, and both ends of the coil 4 are connected to the inner wire element 6.
The coils 2 and 4 and the capacitor 8 form a tuned balun circuit 9.

In addition, behind the double sheath coaxial cable 3, there is another double sheath coaxial cable 3' which is constructed in exactly the same way as this, and whose length is, for example, the length of the angler/7 multiplied by the wavelength shortening rate of the cable. The core wires 5, 5' of these double-sheathed coaxial cables 3 and 3' and the inner wire element 6
, 6' are connected to each other, and the outer wire elements 7, 7' are kept disconnected.

Furthermore, the inner and outer wire elements 6' of the double-sheathed coaxial cable 3', ? ' are both connected to the case side of the connector 10,
The core wire 5' is connected to the plug side of this connector 10.
is coupled to a transceiver (not shown).

Therefore, the outer wire element 7 of the double-sheathed coaxial cable 3 comes to act as a radial antenna element, and this and the antenna element 1 form a dipole antenna, which is excited by mutually opposite-phase currents and horizontal and vertical images. It becomes possible to use it for polarization communication.

Further, the other double-sheathed coaxial cable 3' acts as a spell top and blocks the sheath current at the outer wire element 7', thereby maintaining stable matching and reducing body effects.

Furthermore, by varying the tuning capacitor 8 in the tunable balun circuit 9, impedance matching is achieved without antenna adjustment, and stable, high-gain communication can be performed without the need for metal grounding.

Note that the antenna element 1 of the above embodiment may be a telescopic multi-stage antenna.

As described above, according to the present invention, the outer wire element 7 of the double-sheathed coaxial cable 3 is used as the antenna element, and the actual antenna is only the vertical antenna element 1, so it is smaller than the conventional dipole antenna. , and it is possible to communicate with high sensitivity even when the communication partner uses either a vertically polarized antenna or a horizontally polarized antenna.

Furthermore, since a metal ground is not required, it can be installed on a glass fiber boat without having to be grounded for good communication.

Furthermore, since the double sheath coaxial cable 3' is used to perform the spell top function, this part can be made compact, and body effects can be effectively prevented and impedance characteristics can be stabilized.

Furthermore, even if the antenna element 1 has a length of λ/8, the coil 2
Impedance matching can be achieved by changing the number of turns.

[Brief explanation of the drawing]

Figure 1 shows the constituent parts of an embodiment of the communication antenna device for horizontal and vertical circular polarization according to the present invention, Figure 2 is its electrical equivalent circuit diagram, and Figure 3 is a perspective view showing a double-sheathed coaxial cable. be. 1... Antenna element, 2, 4... Coil, 3゜3'... Double sheathed coaxial cable,
5, 5'... Core wire, 6, 6'... Inner line element, 7, 7'... Outer line element, 8...
Capacitor, 9... Tuned balun circuit, 10-
--------Connector.

Claims (1)

[Scope of utility model registration request] An antenna element that is vertically installed and has a length of 1/4 to 1/8 (λ: wavelength), which extends horizontally from the base of the antenna element via a tunable balun circuit, and is the same as the antenna element. A dipole antenna capable of horizontal and vertical polarization communication is formed by connecting the jackets of a long double sheath coaxial cable, and the double sheath serves as a spell top coaxially with the double sheath coaxial cable. For horizontal and vertical circular polarization, characterized in that a double sheathed coaxial cable having the same length as the coaxial cable is provided and is configured to be connected to a connector to a transceiver etc. via another double sheathed coaxial cable. Communication antenna device.