User's Manual
Table Of Contents
- Foreword
- Important Safety Information
- Contents
- About this Document
- Related Publications
- Product Description
- Features
- Specifications
- Air Interface
- Product Functionality
- Contents
- Integration Goal and Objectives
- Customer Problem Isolation
- Wireline and Wireless Communications
- Design Tips for Serviceability
- Environmental Issues
- Regulatory Requirements
- Contents
- Power Supply
- Host Interface
- Power Management
- Antenna Systems
- Hardware Recommendations
- Battery Selection Criteria
- Contents
- Hardware Integration
- Application Software
- Final Assembly
- Installation
- Troubleshooting
- End User Problem Resolution
- Service Depot Repair
- Contents
- Accessories and Options
- Abbreviations and Acronyms
- Desense Overview
- Desense Measurement Techniques
- Preparing the Device Under Test
- Performance Goals
- Methods of Controlling Emissions
- Antenna
- Summary
- FLEX Application Protocol Licensing
- Licensing
July 23, 2002 4-21
CreataLink2 XT Hardware Integrator’s Guide Hardware Integration
Antenna Systems
Antenna Mounting
1. It is not recommended to connect the antenna directly to the CreataLink2 XT.
2. Connect the antenna to the CreataLink2 XT using RG58/U coax cable (or
equivalent) of at least 3 feet in length.
3. Do not mount the antenna in close proximity to other antennas. Try to stay as
far away as practically possible. Separation of antennas must be at least three
feet. It is recommended to mount different antennas one above the other rather
than one besides the other. Coupling between vertically polarized antennas is
minimal in the vertical direction.
4. For fixed wireless outdoor applications, mount the antenna as high as practi-
cally possible. Stay away from objects, especially metal objects.
5. For fixed wireless indoor applications, you must search for the best location.
As a general rule of thumb, mount the antenna four feet above the floor. Stay
away from walls, and try to mount the antenna in front of an external window.
6. For vehicular applications, you must purchase an antenna that is designed to
be mounted in vehicles and meet the specific requirements listed in the
Antenna Selection Criteria. Follow the antenna manufacturer’s instructions
for antenna mounting.
Antenna Location
Finding the best location for the antenna is critical for overall system success. It is
especially critical in indoor application. You must search and find the best antenna
location that will result in successful communication.
Antenna Test Methods
The antenna performance must meet the impedance and match the criteria of the
data transceiver specification, and have the gain to meet the network ERP
requirements.
Perform the following two antenna tests to ensure the antenna meets requirements.
Integrate the antenna in its final form for both tests:
Impedance Match Test
Measure and verify that the nominal impedance and resulting VSWR, or return
loss, are within specifications (See Table 2-6).
Gain Test
Measure the gain with a test facility to ensure the ERP and pattern ripple are
acceptable. Pattern ripple is the gain deviation measured in a 360 degree polar plot.
A typical polar plot is shown (see Figure 4-12). The antenna could have 3 dB gain
in one direction and zero gain in another. If the average gain is 1.5 dB, the ripple
is +/- 1.5 dB. Ripple is the measure of uniformity of gain. Most networks specify a
nominal gain and an allowable ripple.