JPS5870640A - Diversity reception system - Google Patents

Abstract

PURPOSE:To perform excellent reception with greater diversity effect, by switching and using an electric antenna and a magnetic field antenna. CONSTITUTION:A diversity reception antenna consists of the combination of a loop antenna 11 of magnetic field reception type and an antenna 12 of electric field reception type, and feeding terminals 1a, 1b and 2a, 2b of the antennas are led to a receiver via a switching device (not shown). The switching device is switched and controlled in accordance with on the reception level of both antennas as conventional. The system like this is suitable for a reception system for mounting on car and in such a case, the provision of two sets of antenna systems as shown in figure offers further better results.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diversity reception system, and is capable of performing good diversity reception.

As shown in FIG. 1, a conventional tie-versity receiving system is usually formed of an electric field type antenna 1.2, a receiving section 3, a Nupica 4, and an antenna switching device 7 consisting of a switch 5 and a Nui no Chi distribution circuit 6. , the antenna with the stronger electric field strength of the reception input applied to antennas 1 and 2 is selected.

Now, if you install a car radio equipped with this system,
Depending on the direction of travel of the car, location, etc., both antennas 1.2
There are cases where the electric field levels of the receiving inputs applied to the signal cannot be received satisfactorily.

The present invention eliminates these drawbacks.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. Figure 2 shows electric field level E and magnetic field level I for distance 1.
FIG. 3 is a configuration diagram showing an antenna of a tie diversity reception system which is an embodiment of the present invention, and (a) to (c) are diagrams showing the relationship between the magnetic field receiving type loop antenna 11 and the electric field. This shows a combination with a receiving antenna 12. In the figure, reference numeral 11°1b indicates a power feeding terminal of the loop antenna 11, and 2a.

2b is a power feeding terminal of the antenna 12.

The electric field level of the electric field receiving type antenna 12 and the magnetic field level of the magnetic field receiving type antenna are compared, and the antenna output with the higher level is sent to the receiving section 3 according to the antenna switching booklet.

In this case, the antenna 12 is provided inside the loop antenna 11 and on the same surface as the antenna 12 of the car.

By incorporating it into the surface of the windshield or rear glass, two antennas can be formed at the same time.

In addition, two sets of antennas consisting of the loop antenna 11 and the antenna 12 are used, one set is provided on the windshield, and the other set is provided on the rear glass, and these four antennas are connected to the electric field level and the magnetic field. It may be possible to switch according to the magnitude of the level.

Furthermore, the antennas 11 and 12 may be arranged at different positions.

As described above, according to the present invention, by switching between the electric field antenna and the magnetic field antenna, the berdiversity effect is greater than when only the electric field antenna is switched, and good reception can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional diversity receiving system, FIG. 2 is a characteristic diagram showing the relationship between electric field level and magnetic field level with respect to distance, and FIGS. FIG. 2 is a configuration diagram of an antenna of a diversity reception system. 1, 2, 12... Antenna, 3...
・Receiving section, 4... Speaker, 5... Switch, 6... Drive #J II-1 circuit, 7...
...Antenna switcher, 11...Loop antenna. Proxy (Yoshihiro Morimoto-, so the intestines were vomited, part 6)

Claims (2)

[Claims] (1) An electric field antenna, a magnetic field antenna, connected to the electric field antenna and the magnetic field antenna, and the output of the electric field antenna or the A diversity receiving system comprising an antenna switching device that selectively transmits one of the outputs of a magnetic field antenna. (2) The tie diversity receiving system according to claim 1, wherein a magnetic field type antenna and an electric field type antenna are provided on the same surface.