Radio communication device
A technology for wireless communication devices and communication functions, which is applied to devices, antennas, and loop antennas that enable antennas to work in different bands at the same time, and can solve the problems of reduced antenna installation area, insufficient communication distance, and decreased communication distance in the HF band.
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Embodiment 1
[0062] Next, preferred embodiments of the wireless communication device of the present invention will be described with reference to the drawings.
[0063] figure 1 is a plan view showing the radio communication device according to Embodiment 1 of the present invention, figure 2 Yes figure 1 Sectional view on line A-A' within.
[0064] figure 1 Among them, the wireless communication device includes a flat object 1, a spiral conductive object 2 having external dimensions L and W, an L-shaped (extended shape) conductive object 3, integrated circuits 4, 5, conductive objects 7a, 7b , through holes and other inter-layer connections 8, and a pair of flat plates 30a, 30b (refer to figure 2 ) constitutes a parallel plate capacitor 30. One (upper surface side) plate 30a of the parallel plate capacitor 30 conducts to the conductive object 7a, and the other (lower surface side) plate 30b of the parallel plate capacitor 30 conducts to the conductive object 7b.
[0065] The plate-...
Embodiment 2
[0136] Above-mentioned embodiment 1 ( figure 1 , Figure 8 , Figure 10 ) antenna structure, there may be a problem that the operating frequency band is not too large. In addition, it is conceivable that there is a correlation between the operating frequency bandwidth and the current distribution on the spiral conductive object 2 .
[0137] To confirm it, first for convenience, such as Figure 13 As shown in the top view, the swirl-shaped conductive object 2 is replaced by a square ring-shaped conductive object 12, in Figure 13 In the antenna structure of , the antenna characteristics of the first frequency band are calculated.
[0138] Figure 14 yes means Figure 13 The characteristic diagram of the calculation result of the impedance frequency characteristic Zf4 in the antenna structure.
[0139] Figure 14 In , the plotted frequency of the impedance frequency characteristic Zf4 is compared with Figure 4 The same is shown by 5 points, but it can be seen that the ...
Embodiment 3
[0178] Considering above-mentioned embodiment 1,2 ( figure 1 , Figure 8 , Figure 10 , Figure 16 , Figure 18 ) in a practical form, it is not necessarily possible to mount arbitrary circuit elements on the flat object 1, and an increase in the number of components generally leads to an increase in manufacturing costs.
[0179] Thus, if Figure 25 and Figure 26 In that way, a structure in which only the conductive objects 2a and 2b are used to capacitively couple the windings of the spiral conductive object 2 is considered instead of Figure 18 Structure.
[0180] Figure 25 is a plan view showing a wireless communication device according to Embodiment 3 of the present invention, Figure 26 Yes Figure 25 The sectional view on the line B-B' inside.
[0181] Figure 25 and Figure 26 A configuration example in which the windings of the spiral conductive object 2 are capacitively coupled in the first frequency band is shown.
[0182] Figure 25 Among them, a par...
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