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A crossed slot antenna, a method of fabricating same and a method of designing same. The antenna includes a cavity structure having conductive material on opposed surfaces thereof; and two slots in said conductive material, the slots having slightly different lengths and intersecting each other at o

A crossed slot antenna, a method of fabricating same and a method of designing same. The antenna includes a cavity structure having conductive material on opposed surfaces thereof; and two slots in said conductive material, the slots having slightly different lengths and intersecting each other at or close to a 90 degree angle.

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A crossed slot antenna, a method of fabricating same and a method of designing same. The antenna includes a cavity structure having conductive material on opposed surfaces thereof; and two slots in said conductive material, the slots having slightly different lengths and intersecting each other at o

A crossed slot antenna, a method of fabricating same and a method of designing same. The antenna includes a cavity structure having conductive material on opposed surfaces thereof; and two slots in said conductive material, the slots having slightly different lengths and intersecting each other at or close to a 90 degree angle. bstrate as a antenna for transmitting and/or receiving radio waves of a second frequency lower than said first frequency; a ground via for connecting ground portions of said first and second antennas each other; a feed via for connecting feed points at the radio-wave resonant portions of said first and second antennas each other; a feed cable whose ground line and feed line are connected to said feed via and the ground portion of said first or second antenna, respectively; and a frame ground member connected to the ground portion of said first or second antenna. 9. The transceiver according to claim 8, comprising: a first signal-processing unit for said first antenna; a second signal-processing unit for said second antenna; and a selection unit for selecting either of said first and second signal-processing unit and connecting the selected signal-processing unit to said feed cable. 10. Electrical equipment, comprising a transceiver, wherein said transceiver has: an insulating substrate having first and second antenna-only areas at least overlapping with each other when viewed from a direction vertical to a face at the both side faces; a first antenna whose element is formed by a conductive film in the first antenna-only area of said insulting substrate as an antenna for transmitting and/or receiving radio waves of a first frequency; a second antenna whose element is formed by a conductive film in the second antenna-only area of said insulating substrate as an antenna for transmitting and/or receiving radio waves of a second frequency lower than said first frequency; a ground via for connecting ground portions of said first and second antennas each other; a feed via for connecting feed points at the radio-wave resonant portions of said first and second antennas each other; a feed cable whose ground line and feed line are connected to said feed via and the ground portion of said first or second antenna, respectively; a first signal-processing unit for said first antenna; a second signal-processing unit for said second antenna; and a selection unit for selecting either of said first and second signal-processing unit and connecting the selected signal-processing unit to said feed cable. 11. A computer terminal, comprising: a body having an operational portion; a cover for covering said body at a closed position where a display is set; and a hinge member for connecting said body and said cover each other so that said cover swings between its closed position and open position against said body, wherein said cover includes: an insulating substrate having first and second antenna-only areas at least overlapping with each other when viewed from a direction vertical to a face at the both side faces; a first antenna whose element is formed by a conductive film in the first antenna-only area of said insulting substrate as an antenna for transmitting and/or receiving radio waves of a first frequency; a second antenna whose element is formed by a conductive film in the second antenna-only area of said insulating substrate as an antenna for transmitting and/or receiving radio waves of a second frequency lower than said first frequency; a ground via for connecting ground portions of said first and second antennas each other; a feed via for connecting feed points at the radio-wave resonant portions of said first and second antennas each other; and a feed cable whose ground line and feed line are connected to said feed via and the ground portion of said first or second antenna, respectively. 12. The computer terminal according to claim 11, wherein a first signal-processing unit for said first antenna, a second signal-processing unit for said second antenna, and a selection unit for selecting either of said first and second signal-processing unit and connecting the selected signal-processing unit to said feed cable are included. 13. The computer terminal according to claim 11, wherein said hinge member has a conductive rotary shaft, and a conduc tive body-side hinge and a conductive cover-side hinge which are rotatable about the axis of the rotary shaft and combined with said body and said cover to rotate together, said cover-side hinge extends up to the vicinity of the front end of said cover far from the rotary shaft, and an antenna system includes said insulating substrate, first and second antennas and is set to said cover-side hinge so as to face-contact the vicinity of the front end of said cover-side hinge at the ground portion of said first or second antenna but not to contact said cover-side hinge at the radio-wave resonant portions of said first and second antennas. ring on a rear-view mirror of said vehicle or device, a visual signal appearing on front windshield of said vehicle or device, and, a wireless signal generated from said vehicle or device. 49. The device of claim 41, further comprising components selected from the group consisting of components for controlling temperature and components for compensating effects due to temperature changes, during operation of the device. 50. A device for in-use detecting low cranking strength of a combustion engine battery during engine starting, the engine starting featuring activation and initiation of cranking of the combustion engine crankshaft by energy supplied by the combustion engine battery, the device comprising: (a) a constant reference DC voltage; (b) a comparator operatively connected to leads of the combustion engine battery and to said constant reference DC voltage, for sensing time varying voltage of the battery and for comparing said time varying voltage of the battery to said constant reference DC voltage, thereby forming a plurality of output signals of said comparator from initiation of and during the engine starting; (c) an integrator operatively connected to said comparator, for integrating said plurality of said output signals of said comparator, thereby forming an output signal of said integrator during the engine starting; (d) a detector operatively connected to said integrator, for determining and responding to said output signal of said integrator, thereby forming an output signal of said detector during the engine starting; (e) a one shot operatively connected to said detector, for determining and responding to said output signal of said detector, thereby forming an output signal of said one shot during the engine starting; (f) a counter operatively connected to said one shot, for determining and responding to said output signal of said one shot, whereupon according to said output signal of said one shot said counter registers a count number of occurrences of the low cranking strength of the battery, thereby forming an output signal of said counter during the engine starting; (g) an alarm operatively connected to said counter, for determining and responding to said output signal of said counter, whereupon according to said determination by said alarm, said response by said alarm is selected from the group consisting of remaining inactive and activating for providing an in-use warning signal of the low cranking strength of the battery to an operator of the combustion engine, at a time selected from the group consisting of during the engine starting and following the engine st