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Antenna Couplers
Why do AM radio signals increase in amplitude near high-voltage power lines?
When driving under high-voltage power lines, AM radio signals get louder. Is the RF carrier somehow getting amplified by the 60Hz electromagneting field around the lines? Is the modulation depth getting somehow increased? Does the field act as a coupler between my antenna and the lines, in effect making the power lines extension of my antenna? Is the RF carrier being ducted from the transmitter?
A 60 Hz power line's EM field would have almost no effect on an AM radio signal (~1 MHz). The only effect it would have on a car stereo is a 60 Hz "hum" if the field coupled with the car.
What is likely to be happening is that, when you drive near the power lines, part of the signal that is incident upon the power lines is reflected back toward your car. Depending on your location relative to the power lines, this reflected signal will either add to, or subtract from, the energy received by your car's antenna.
Since it is an AM signal (this doesn't work with FM), if the scattered field "constructively interferes" with the signal at the antenna, the amplitude of the signal at the receiver increases and you get a louder output from the speakers.
The opposite can also be true. You may notice that sometimes, when you drive under power lines, the signal fades until you are out from under them. This is called "destructive interference" and is a result of the reflected waves subtracting from the signal at your car's antenna.
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Photonic Hybrid Couplers $97.19 Microwave photonics has been introduced as a tool of achieving ultra broad communication systems. RADAR, navigation, and radio astronomy systems can also utilize microwave photonics to achieve broader bandwidths. Hybrid couplers play a major role in microwave equipments. Traditional wideband hybrid couplers are already available in the microwave domain but there are still limitations on bandwidth and phase ripple as well as input/output impedance. The aim of this work is to develop a wideband quadrature hybrid coupler utilizing microwave photonics technology and to demonstrate the application of such a coupler. Major contributions made by this work include the implementation of a photonic Hilbert transformer, used to achieve inphase and quadraturephase generation over a wideband frequency range with low phase ripple. This Hilbert transformer is used as a hybrid coupler to implement a microwave photonic instantaneous frequency measurement system and a photonic feed for a reconfigurable sinuous antenna. This book is recommended for students and researchers working in the area of optical communication and microwave photonics. Author: Emami, Hossein/ Sarkhosh, Niusha Binding Type: Paperback Number of Pages: 104 Publication Date: 2010/05/21 Language: English Dimensions: 5.98 x 9.01 x 0.24 inches |
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TN339/GR Antenna Coupler
High Frequency antenna question(HF) Couplers?
does anyone know what inert gas is used to keep moisture out of a HF coupler:?
It is pressurized with nitrogen, not argon.
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