Array antenna control device and array antenna device
First Claim
1. A controller for controlling an array antenna, said array antenna comprising:
- a radiating element for receiving a transmitted radio signal;
a plurality of parasitic elements each provided to be distant from said radiating element at a predetermined interval; and
a plurality of variable reactance elements connected to said parasitic elements, respectively, wherein said controller changes reactances to be set to said variable reactance elements, respectively, so that said parasitic elements operate as waveguides or reflectors, thereby changing a directivity characteristic of the array antenna, wherein said controller comprising;
a control device for selecting one reactance set from among a plurality of reactance sets in a plurality of cases of setting the plurality of reactance sets, respectively so as to be able to obtain a diversity gain equal to or larger than a predetermined value, based on the radio signal received by said array antenna, based on a signal quality of the radio signal received in each of the plurality of cases according to a predetermined selection criterion, and for setting the selected reactance set to the plurality of variable reactance elements, respectively.
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Accused Products
Abstract
An array antenna apparatus (100) includes a radiating element (A0) for receiving a transmitted radio signal, two parasitic elements (A1, A2), and two variable reactance elements (12-1, 12-2) connected to the respective parasitic elements (A1, A2), and a directivity characteristic of the array antenna apparatus is changed by changing reactances set to the variable reactance elements. An antenna controller (10) selects and sets one reactance to be set from those in a first case in which a first reactance set is set to the two variable reactance elements (12-1, 12-2) and a second case in which a second reactance set is set to the two variable reactance elements (12-1, 12-2) to be able to obtain a diversity gain equal to or larger than a predetermined value, based on a received radio signal, based on signal quality of the radio signal.
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Citations
22 Claims
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1. A controller for controlling an array antenna, said array antenna comprising:
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a radiating element for receiving a transmitted radio signal;
a plurality of parasitic elements each provided to be distant from said radiating element at a predetermined interval; and
a plurality of variable reactance elements connected to said parasitic elements, respectively, wherein said controller changes reactances to be set to said variable reactance elements, respectively, so that said parasitic elements operate as waveguides or reflectors, thereby changing a directivity characteristic of the array antenna, wherein said controller comprising;
a control device for selecting one reactance set from among a plurality of reactance sets in a plurality of cases of setting the plurality of reactance sets, respectively so as to be able to obtain a diversity gain equal to or larger than a predetermined value, based on the radio signal received by said array antenna, based on a signal quality of the radio signal received in each of the plurality of cases according to a predetermined selection criterion, and for setting the selected reactance set to the plurality of variable reactance elements, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An array antenna apparatus comprising:
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one radiating element;
two parasitic elements between which said radiating element is provided, and said two parasitic elements being provided linearly together with the radiating element; and
two variable reactance elements connected to said parasitic elements, respectively, wherein said array antenna apparatus changes reactances which are set to said respective variable reactance elements, so that the parasitic elements operate as waveguides or reflectors, thereby changing a directivity characteristic of said array antenna apparatus, wherein said array antenna apparatus further comprises;
a dielectric substrate including first and second surface parallel to each other;
a grounding electrical conductor formed on a predetermined first region on the second surface of said dielectric substrate; and
three strip electrical conductors formed on the first surface of said dielectric substrate, said three strip electrical conductors being formed to have a predetermined length so as to protrude from a region opposite to the first region, and said three strip electrical conductors being provided at a predetermined interval, and operating as the radiating element and the two parasitic elements, respectively. - View Dependent Claims (22)
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Specification