A Yagi–Uda antenna, or simply Yagi antenna, is a directional antenna consisting of two or more parallel resonant antenna elements in an end-fire array; [1] these elements are most often metal rods (or discs) acting as half-wave dipoles. [2]

The JK Big-Tri has been designed for Hams looking for a slightly longer boom Tribander while enjoying maximum performance on 20/15/10. This Tri-Bander's elements follow the same taper schedules and element construction as the Navassa5 antenna.

JK Antennas JK-Big-Tri HF Yagis have been designed for Radio Amateurs looking for a slightly longer-boom tri-band antenna, while enjoying maximum performance. Employing 16 elements covering 20, 15 and 10 meters, these antennas are marketed to the segment of the ham community that wants to put up a superior Yagi with outstanding performance.

So how much bigger would we have to make a Yagi in order to increase its gain by 3dB? If you think about it, the answer is obviously about twice as big. Consider Figs. 1a and 1b. This is a fairly big 2m Yagi with 13 elements on a six metre boom. It has a gain of 12.74dBd and a clean pattern.

2019年12月24日 · In this article I will discuss how high a horizontally oriented yagi needs to be raised for reliable impedance matching, and then how to adjust the physical antenna so that it performs according to the computer design.

2024年2月26日 · The Yagi-Uda antenna, also known as Yagi antenna, catches TV and radio signals. Invented by Japanese scientists Hidetsugu Yagi and Shintaro Uda in the 1920s, it's great at sending signals in one direction. Useful for improving TV signals, ham radios, radar, and satellite communication.

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2017年8月2日 · Here are two videos on how to setup and tram your big yagi. Ray W2RE from HudsonValleyTowers with 20+ years of tower experience walks you through the process from the tram setup to the install. Not every location will have room for crane or manlift, here is another method with just two men to make it happen.

2014年4月17日 · Abstract: A novel slot Yagi-like multilayered antenna with the feasibility of obtaining high gain and large bandwidth is proposed and demonstrated at 4.2 GHz. The key design of the antenna is that patches slit with shaped slots are used as the parasitic elements to form a vertically stacked antenna structure, which is the first time that this ...

2017年5月24日 · To understand the Yagi’s design, recall that a plain old dipole antenna in free space has a radiation pattern that is the strongest broadside to the antenna. That results in two big lobes off...