Feeding waveguide and sector antenna

Abstract

In the sector antenna of the present invention, a feed waveguide is formed branching from the feed port in the middle to each of the plurality of antennas. Such a feeder waveguide is formed by a waveguide, and includes a main feeder line and branch feeder lines branched in two directions from both ends of the main feeder line, and the main feeder line extends from the waveguide extending from the feeder port to two directions. Direction produces branches. A sector selection structure is provided for cutting off and forming each branch waveguide at a position starting from each branch feeder branched and extended from the main feeder line by effectively forming a conductive wall blocking the cross-section of each branch waveguide .

Description

technical field [0001] The present invention relates to a feeding waveguide for wireless communication devices in microwave and millimeter wave bands, and to a sector antenna using the feeding waveguide. Background technique [0002] In recent years, an ultra-high-speed wireless communication system such as a wireless LAN or a communication system according to the IEEE1394 standard has been realized, enabling multimedia data transmission including moving pictures. Such a system needs to achieve ultra-high-speed data transmission of at least 100Mbps at a low bit error rate. To avoid adverse effects of multipath propagation on communication, narrow beam antennas are used and point-to-point communication is achieved from a specific location to a specific location. [0003] Figure 1A and 1B A schematic diagram of a prior art narrow beam antenna is shown. The antenna is a planar antenna in which a feeding portion 53 is formed on one surface and an antenna element is formed on...

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Problems solved by technology

[0009] However, in conjunction with figure 2 In the configuration of the prior art example described, for the selection structure of each sector, that is, the MMIC 74, the presence of the longer feed distribution path 73 results in leakage of transmit power to the feed distribution path 73, rather than from the feed distribution path 73. electrical distribution path 73 leakage to selected sectors, and thus reduces the effective transmit power

There is also the disadvantage of reflecting signal waves in the cut-off MMIC74, and these reflected signal waves interfere with the signal waves launched to the selected sector and adversely affect

[0010] In the sector antenna described in JP-A-H11-225013, only the circuit of each antenna switch as a selection structure is shown, and the leakage of the transmission power of the non-selected feed distribution path and the leakage caused by the Adverse Effects Caused by Reflection

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