Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2000-06-09
2001-09-04
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S895000
Reexamination Certificate
active
06285329
ABSTRACT:
TECHNICAL FIELD
The invention relates to the design of radio electronic devices, including antenna-feeder facilities and can be used in the portable (pocket) receiver-indicators of the GPS and GLONASS satellite radio navigation systems (SRNS) using the quadrifilar antennas for signal reception.
PRIOR ENGINEERING LEVEL
The use of quadrifilar antennas in the receiver-indicators SRNS is advantageously used because the latter have a relatively wide directional pattern and a relatively wide frequency band (compared, for example, with microstrip antennas), acceptable characteristics of the elliptic coefficient and standing-wave ratio, and, most importantly, small dimensions, simple design and a low price (cf. Dyson J. D. Proc. Of the Nat. Electronics Conf. Vol. XVII, 1961, pgs. 206-213). The last-mentioned advantage enables their application in general-purpose pocket-receiver-indicators. A point of particular interest in designing the receiver-indicator is a choice of a place and a way of fixing the quadrifilar antenna on the body to ensure the best operational parameters of the antenna. Known in the art is a design of the portable receiver-indicator, in which the quadrifilar antenna is rigidly secured to the upper part of the body in parallel to its axis of symmetry (cf. GPS World September 1993, p.38, Magellan III). A specific feature of such a design is that for normal reception of the SRNS signals the antenna pattern and, consequently, the antenna and the whole body should be oriented upwards. However, this hinders the manipulation of the controls by the operator since for the ergonomics reasons the control panel should be arranged at an angle of 20° to 30° to the horizon. If the receiver-indicator body is located so that it is convenient for the operator, the intensity of the reflected signals increases, the field of view is reduced, and the thermal noise also increases due to the reception of the earth radiation, thus decreasing the receiver-indicator accuracy.
The closest in technology to the claimed design is the portable receiver-indicator selected as a prior art and comprising a body, elongated in the longitudinal direction and made as a parallelepiped, and a quadrifilar antenna with a connecting cable secured on the side wall of the body and capable of rotating in the elevation-angle plane. Both in the operating and non-operating (storage) position the transversal axes of the antenna and body are parallel (cf. GPC World. December 1994, p.48, Magellan Promark V). This construction allows the receiver-indicator body to be installed in a position convenient for the operator, i.e. with the antenna orientated vertically upwards and body oriented at an angle to the horizontal. The disadvantage of such a construction is an increase of the width of the receiver-indicator by a value equal to antenna cross section that does not enable putting the receiver-indicator into a standard clothing pocket. This construction also partially shields the antenna with the body in the operating position.
DISCLOSURE OF THE INVENTION
The technical task to be solved by the claimed invention is to construct a convenient use portable receiver-indicator while minimizing its size and the screening effect of the body on the antenna in the operating position.
The nature of the invention consists in providing a receiver-indicator for a satellite radio navigation system made in the form of a parallelepiped comprising an elongated body and a quadrifilar antenna with a connecting cable fixed on the body and enabling rotation so that in the operating position the longitudinal axis of the antenna is directed vertically upwards while the longitudinal axis of the body is directed at an angle to the horizontal. The quadrifilar antenna length does not exceed the width of the body and is fixed on the end-face of the upper part of the body through a spherical hinge joint through which the connecting cable passes so that in the storage position the transversal axis of the antenna is parallel to the longitudinal axis of the body, and the longitudinal axis of the antenna is parallel to the transverse axis of the body. While in the operating position, the transverse axes of the antenna and body extend in the directions perpendicular to each other.
The quadrifilar antenna is a four-way spiral whose conductors are excited with identical amplitudes and with 90° phase shift between the adjacent conductors [
3
]. The conductors are made on the internal or external surface of the body. The length of each conductor is approximately equal to a quarter-wavelength. The maximum of the of the antenna pattern is formed in the direction of axis
7
.
REFERENCES:
patent: 5255001 (1993-10-01), Tamura et al.
patent: 5940039 (1999-08-01), Wang et al.
patent: 6150984 (2000-11-01), Suguro et al.
Baker & McKenzie
Clinger James
SamSung Electronics Company, Limited
Wong Don
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