Dual band antenna with increased sensitivity in a horizontal direction
A dual-band antenna and conductor plate technology, applied in independent antenna unit combinations, antennas, independent non-interactive antenna combinations, etc., can solve the problems of reduced sensitivity, resonance frequency deviation, and inability to fully utilize radio waves, etc.
Inactive Publication Date: 2004-08-18
ALPS ALPINE CO LTD
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Problems solved by technology
However, the vehicle-mounted communication device has many opportunities to transmit and receive signal waves propagating in the horizontal direction. Therefore, if the conventional dual-band antenna 1 is used as the vehicle-mounted communication antenna, the second frequency f may not be fully utilized. 2 radio waves
In particular, the resonant frequency of the rectangular conductor plate 2b deviates from the preset second frequency f 2 In the case of
But in reality, sometimes the resonant frequency deviates from the set value due to the influence of the bracket used for antenna installation, etc.
It is difficult to correct this deviation with past dual-band antennas1
Method used
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[0019] Embodiments of the invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view of a dual-band antenna according to an embodiment of the present invention, figure 2 FIG. 3 is a side view of the dual-band antenna, and FIG. 3 is a characteristic diagram showing a radiation pattern of the dual-band antenna.
[0020] The dual-band antenna 10 shown in Figures 1 and 2 is a small antenna, and its structure is: stamping a metal conductor plate (such as a copper plate) into a predetermined shape, and then setting it on the ground conductor 11, which is supported A conductive layer such as copper foil is provided on almost the entire surface of the substrate 30, and this antenna is used as an inverted-F antenna and a monopole antenna. On this dual-band antenna 10, there are: a first radiation conductor plate 12 arranged in parallel with the ground conductor 11, an elongated power supply conductor plate 13 extending downward from appro...
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A dual band antenna is provided which assures enhanced sensitivity in the horizontal direction for two kinds of frequency bands, high frequency band and low frequency band. The dual band antenna comprises a first radiating conductor plate disposed substantially parallel to a grounding conductor, a power-supplying conductor plate extending downwards from the first radiating conductor plate, a connecting conductor plate for connecting the first radiating conductor plate to the grounding conductor, a second radiating conductor plate provided upright beneath the first radiating conductor plate and having a substantially wedge-shaped, elastically deformable portion, and a synthetic resin adjusting screw threaded to the first radiating conductor plate for depressing the top portion of the second radiating conductor plate downwards. The first radiating conductor plate resonates at a first frequency, while the second radiating conductor plate resonates at a second frequency that is higher than the first frequency. In addition, the second radiating conductor plate is constructed so that the gap between the second radiating conductor plate and the first radiating conductor plate can be changed.
Description
technical field [0001] The present invention relates to a small dual-band antenna capable of transmitting and receiving signal waves of two frequency bands (wave bands) and suitable for mounting in a vehicle-mounted communication device or the like. Background technique [0002] Conventionally, as a dual-band antenna suitable for miniaturization, an inverted-F antenna capable of resonating at two high and low frequencies by providing a radiating conductor plate with notches has been proposed (for example, refer to Patent Document 1). [0003] FIG. 5 is an explanatory diagram showing this conventional example. The inverted F-shaped dual-band antenna 1 shown in this figure, by forming a rectangular cutout 4 on the radiating conductor plate 2, possesses: 1 The resonant L-shaped conductor plate 2a, and at a frequency higher than the first frequency f 1 High second frequency f 2 Resonant rectangular conductor plate 2b. One end of the radiation conductor plate 2 is connected t...
Claims
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IPC IPC(8): H01Q21/28H01Q5/10H01Q5/35H01Q9/04H01Q9/40H01Q13/08H01Q21/30
CPCH01Q9/0442H01Q9/0421H01Q5/0048H01Q5/0072H01Q5/35H01Q5/40A47J37/067A47J36/04
Inventor 四方胜佐佐木和广田中规生
Owner ALPS ALPINE CO LTD