Communications: radio wave antennas – Antennas – Wave guide type
Patent
1995-09-25
1998-06-02
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Wave guide type
343786, 343882, H01Q 1300
Patent
active
057607494
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an antenna integral-type transmitter/receiver system that is chiefly installed outdoors for use in transmitting and receiving radio signals.
2. Description of the Related Art
Generally, there are antenna integral-type transmitter/receiver systems each integrally formed of an antenna 7 and a transmitter/receiver system body 1, as shown in FIG. 28, acting as submilliwave or milliwave band radio equipment used for subscriber radio or the like.
Two sets of radio equipment, as shown in FIG. 27, are respectively installed facing each other on the two remote buildings 40 and 41, for example, and are used as means for performing mutual communications between two buildings 40 and 41. This radio equipment may be used for a variety of applications other than communication means between two buildings 40 and 41.
The antenna integral-type transmitter/receiver system has its internal configuration as shown in FIG. 29. The transmitter/receiver system body 1 consists of a high-frequency electrical circuit unit (RF unit) 2, an intermediate frequency electrical circuit unit (IF unit) 3, a power supply unit (PS unit) 4, a case 5 acting as a housing, and a cover member 6.
The main electrical circuit units 2, 3, and 4 are independently housed as respective units for insertion into or extraction out of the case 5. Thus an exchange can be made to each of the printed wiring boards for the main circuit units. If the transmitter/receiver system body 1 is maintained, inspected, or repaired, an abnormal circuit is exchanged for the whole unit. Referring to FIG. 29, numeral 15 represents an external interface connector.
Moreover, as shown in FIG. 30, in the antenna integral-type transmitter/receiver system, a horizontal/vertical conversion waveguide (VH conversion waveguide) 44 is mounted at the juncture of the antenna (this figure showing an example in which an axially-symmetrical parabola antenna is used as an antenna 7) 7 and the waveguide input/output unit 8D. This VH conversion waveguide 44 implements a horizontal/vertical polarized wave conversion. FIG. 31 illustrates an example of a horizontal (H) conversion and an example of a vertical (V) conversion. That is, in the case of the horizontal conversion, three members 44a, 44b, and 44c each with the opening having a gradual different angle are overlapped with each other. In the case of the vertical conversion, the member 44d is used which has an opening whose angle is not twisted and a thickness corresponding to the total thickness of, for example, the three members 44a, 44b, and 44c.
It is required that the radio equipment is, in nature, at low price, easy to be handled, and can be installed anywhere. Hence, it has been strongly desired that the radio equipment is small in size, lightweight, and low in cost.
With the device down-sized and manufactured at low cost, it is becoming mainstream that in order to reduce markedly working hours, the whole device is replaced, rather than that a defect spot is checked with maintenance tools at a failure time and then the defect unit is replaced for a new one. Hence there is a decreasing need for dividing the internal unit.
On the other hand, in the device shown in FIG. 29, the RF unit 2, the IF unit 3, and the PS unit 4 each made in a united form increase the number of parts and assembling steps, so that the increased number of the assembling steps decreases the manufacturing efficiency (or occurring the so-called division loss). Moreover, the difficulty in converting circuits into a LSI or MMIC form impedes a device miniaturization.
The present invention overcomes the above mentioned problems. An object of the present invention is to provide a small, lightweight antenna integral-type transmitter/receiver system which realizes the reduced number of parts and assembling steps.
SUMMARY OF THE INVENTION
For that reason, according to the present invention, the antenna integral-type transmitter/receiver system is characterized by a housing having one end s
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Hagiwara Yu-ichi
Kaneko Masahiko
Kobayashi Toshimitsu
Kumahara Kazuo
Minowa Yoshiaki
Fujitsu Limited
Hajec Donald T.
Ho Tan
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