antenna tilt in umts

Status
Not open for further replies.

moon84

Member
Joined
Aug 14, 2008
Messages
2
Hey All

I am intrested in antennas in UMTS networks. Especially I am looking some info about realization of electrical tilt in antennas. How is it done? I would be very greatful for any information.

Regards
 

byndhlptom

Member
Joined
Nov 1, 2005
Messages
390
Location
JoCo, KS (SoDak native)
Beam tilt

As I understand it, you tune an antenna array (typically a vertical colineanar of some type) to a higher frequency. When you feed it a frequency below it's design signal, the phasing of the elements causes the main lobe to tilt down (I may have this backwards, ie lower tune for down tilt). The effect helps fill in low spots, or improve coverage closer to a very high antenna. Tilt of 4-5 degrees are common. You don't see this much below UHF though. If the coverage area is on one side of the antenna, then a simple tilting of the antenna accomplishes the same thing

I'm sure that I'll be corrected if my memory is off....

tom
 

jfr

Member
Premium Subscriber
Joined
Jan 10, 2004
Messages
73
Location
Walpole, Ma
Are you asking about the propagation of E-tilt vs mechanical tilt?

I'm a performance engineer for a rather large wireless carrier. We actually have remote e-tilts in our UMTS system now. It's the coolest thing for an RF Engineer. I can sit at my desk and add/reduce the e-tilt on our cell sites. What's even cooler? Sitting in the far field of a sector, connected to our internal network via UMTS aircard w/ VPN, and moving the tilts on the antennas until the overshoot/interference, etc is gone, right before your very own eyes!

-JR
 
Status
Not open for further replies.
Top