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Electrical Engineering/Antenna fixing location/s in automobiles.


Antenna Fixing Location
Antenna Fixing Locatio  
QUESTION: Dear Prof Cleggsan

What would be the ideal location/s for fixing Antenna in automobiles viz Cars, Luxury Buses, Trucks to receive radio signals viz FM, AM frequencies ?.

Can there be any advantage of fixing more than one antenna in different locations ?.

Are there automobiles viz Cars, Luxury Buses, Trucks etc which can receive the radio signals without fixing a antenna ?.

Thanks & Regards,
Prashant S Akerkar

ANSWER: Diversity systems are a good engineering solution for improved reception in moving vehicles:

Nissan car models were equipped with diversity systems a few years ago but the current line of cars no longer supports them.  I don't know why they dropped it because it enhanced reception quite nicely.  Probably due to cost; two antenna instead of one and special switching electronics must be added to the receiver circuitry.

Center roof location is not so good because of garage doors and low overheads in parking garages and such present a breakage problem.  Front hood and back trunk locations are most common because of convenience for mounting.

But, the final design and layout are a function of the vehicle body design and where the project manager decides is the best location.  The radio system designers then must optimize the receiver specifications, sensitivity, length of cable and materials used in construction of the antenna.  It is a systems solution; not just the question of antenna location.  

New digital systems are using much higher frequencies for transmission of the signal.  This brings about the use of smaller antenna due to the shorter wavelength of the signals.

Analog AM and FM radio is not nearly as important as it once was therefore not on the top priority of vehicle entertainment system.  Seems everything is going digital; even in the cars, buses and taxis.

Hope this helps.

---------- FOLLOW-UP ----------

QUESTION: Dear Prof Cleggsan

Thank you.

1. Are there automobiles viz Cars, Jeeps etc etc which can receive the radio signals without fixing a antenna and having a complex receiver design ?.

2. Can the Antenna fixing location also be implemented in heavy vehicles viz
Buses, Trucks, Tempos etc ?.

Thanks & Regards,
Prashant S Akerkar

Receive signal without antenna?  No, antenna provides the input signal to the receiver.  There must be some way of receiving the signal off the air waves.

Size of antenna is function of the frequency and wavelength of the transmitted radio signal.  Not involved with the size or weight of the vehicle.  Radio waves are set by their frequency of transmission which dictates the antenna requirements.  

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BSEE, MBA, Design, R&D, University Research.
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Broad teaching experience; work experience mostly in consumer electronics and conversion from analog to digital technologies. Pioneer in digital audio at all levels.

BSEE (Equiv) BYU BSEE University of North Dakota MSBA (MBA) Illinois State University Graduate Studies in Computer Science - Bradley University Graduate Studies - Ohio University Graduate Studies - University of Missouri Kansas City DeVry Tech - Electronics

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