ANT-2.4-CHP-x
ANT-868-CHP-x
ANT-916-CHP-x
ULTRA COMPACT CHIP ANTENNA DATA GUIDE
DESCRIPTION
The exciting ANT-***-CHP family is
among the world’s smallest high-
performance chip antennas. They are
ideal for embedding in wireless products
including Bluetooth, 802.11, Home RF,
ZigBee and other popular standards.
These tiny antennas use advanced Low
Temperature Co-fired Ceramic (LTCC)
technology and proprietary elements to
achieve superior size and performance
characteristics. The entire family is
compatible with hand- and reflow-
assembly.
Excellent
electrical
specifications, stability, and outstanding
cost-effectiveness make CHP Series
antennas the logical choice for a wide
variety of applications.
PHYSICAL DIMENSIONS
0.26”
(6.5)
2.4
0.09”
(2.2)
0.04”
(1.0)
2.45GHz Version
0.63”
(16.0)
xxx
0.12”
0.07”
(1.7)
868 / 916MHz Versions
FEATURES
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Incredibly compact SMD package
(3.0)
Superior LTCC technology
50Ω characteristic impedance
Low loss
Wide bandwidth
Favorable linear polarization
> Unity gain
No external matching required
Highly stable over temperature & time
Hand- and reflow-assembly compatible
RoHS compliant
Cost-effective
ACTUAL SIZE
2.45GHz
868MHz
916MHz
ORDERING INFORMATION
DESCRIPTION
868MHz Chip Antenna
916MHz Chip Antenna
2.45GHz Chip Antenna
APPLICATIONS
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Bluetooth
802.11
ZigBee
Wireless PCMCIA Cards
Telemetry
Data Collection
Industrial Process Monitoring
Compact Wireless Products
External Antenna Elimination
PART #
ANT-868-CHP-x
ANT-916-CHP-x
ANT-2.45-CHP-x
x = “T” for Tape/Reel, “B” for Bulk
All parts are RoHS compliant.
Standard reel is 3,000pcs. (868/916MHz)
1,500pcs (2.45GHz)
Quantities less than reel size are supplied in bulk.
Revised 1/14/09
SPECIFICATIONS
PHYSICAL SPECIFICATIONS
2.45GHz
Dimensions (mm)
Operating/Storage Temp
6.5(L) x 2.2(W) x 1.0(H)
THEORY OF OPERATION
868MHz
-40 ~ +85°C
LTCC
916MHz
-40 ~ +85°C
LTCC
16.0(L) x 3.0(W) x 1.7(H) 16.0(L) x 3.0(W) x 1.7(H)
Construction
-40 ~ +85°C
LTCC
ELECTRICAL PERFORMANCE
Center Frequency
Bandwidth
Wavelength
Pattern
Polarization
VSWR
Maximum Gain
Impedance
Power Handling
2.45GHz
180MHz
1/4-wave
Omni-directional
Linear
<2.0 (Max.)
868MHz
10MHz
1/4-wave
Omni-directional
Linear
<2.0 (Max.)
916MHz
10MHz
1/4-wave
Omni-directional
Linear
<2.0 (Max.)
The CHP Series antennas utilize Low Temperature Cofired Ceramic (LTCC)
technology to embed the antenna element into a ceramic substrate. Advances in
this technology have resulted in materials that are extremely stable over time
and temperature, producing an antenna that is highly reliable across a wide
range of applications. The high-frequency characteristics of this technology
enable exceptional performance in a very small package. The construction
techniques for LTCC devices lends itself well to favorable pricing in high volume.
LAYOUT CONSIDERATIONS
Proper layout is vital to ensure correct operation and optimum performance.
Improper placement of planes, traces, or system components will result in nulls
or complete de-tuning. Ideally, the antenna will be mounted on the board in such
a way as to allow an unobstructed field of view. The area underneath the
antenna must be free of components, traces, and planes. Components may be
placed to the rear of the antenna in the ground plane counterpoise area. The
feed trace from the RF stage to the antenna must be a microstrip trace or coax
transmission line and should be kept as short as practical.
The layout of our reference jigs is illustrated on the following pages. While they
demonstrate various aspects of a layout, it is not necessary to replicate them
exactly. While your board size and layout may differ, it is important to recognize
that the counterpoise plays an important role in resonance and stability since it
acts, in essence, as part of the antenna. After your own layout is complete, the
performance of the antenna in your specific product should be carefully checked
using tools like a network analyzer. In some cases, the size of the product’s PCB,
proximity of the case, or other factors may make a custom version of the antenna
necessary. Contact Antenna Factor for more information.
+
0.5dBi
50
Ω
3W (Max.)
+
0.5dBi
50
Ω
3W (Max.)
+
0.5dBi
50
Ω
3W (Max.)
2.4GHz FOOTPRINT
0.260"
868 & 916MHz FOOTPRINT
0.630"
0.100"
0.130"
0.040"
0.040"
2.4
PIN CONFIGURATION
No electrical connection.
For physical support only
No ground plane or traces
under the antenna
PCB pads for the CHP
1
Pin Number
1
2
2.4
2
Pin Description
Feed Termination
This pin connects to the transmitter or receiver
Solder Termination
This pin is soldered down for physical support only. There is no
electrical connection
Ground plane on bottom
layer for counterpoise
50-ohm microstrip line
Page 2
Page 3
MICROSTRIP DETAILS
A transmission line is a medium whereby RF energy is transferred from one
place to another with minimal loss. This is a critical factor, especially in high-
frequency products, because the trace leading to the antenna can effectively
contribute to the length of the antenna, changing its resonant bandwidth. In order
to minimize loss and detuning, some form of transmission line between the
antenna and the RF stage should be used, unless the antenna can be placed
very close (<1/8in.) to the RF stage. One common form of transmission line is a
coax cable, another is the microstrip. This term refers to a PCB trace running
over a ground plane that is designed to serve as a transmission line between the
RF stage and the antenna. The width is based on the desired characteristic
impedance of the line, the thickness of the PCB, and the dielectric constant of
the board material. For standard 0.062in-thick FR-4 board material, the trace
width would be 111 mils. The correct trace width can be calculated for other
widths and materials using the information below. Handy software for calculating
microstrip lines is also available on the Antenna Factor website,
www.antennafactor.com.
ASSEMBLY CONSIDERATIONS
The antenna is RoHS Compliant and designed to support hand or automated
assembly. To avoid damage to the part, the reflow solder guidelines found below
should be carefully followed. The antenna is single ended meaning that one pad
is electrically connected while the other is for mechanical support only. The
antenna terminals are not interchangeable so the polarity indicated in the Pin
Configuration section must be observed during assembly.
Hand Soldering
This antenna is designed for high-volume automated assembly, however, it may
be successfully attached by hand assembly techniques. A hand-solder
temperature of 225°C or lower should be used. Do not exceed a 10sec. heating
time.
Reflow Temperature Profile
The single most critical stage in the automated assembly process is the reflow
process. The reflow profile below should be closely followed since excessive
temperatures or transport times during reflow will irreparably damage the
antennas. Assembly personnel will need to pay careful attention to the oven's
profile to ensure that it meets the requirements necessary to successfully reflow
all components while still meeting the limits mandated by the antennas
themselves.
MAXIMUM REFLOW SOLDERING PROFILE
Trace
Board
Ground plane
Temp
340˚C
300˚C
Peak temp 340˚C
150˚C
100˚C
50˚C
25˚C
3
Preheating
Reflow
7
Do not exceed 30secs
20
25
30
Time
Dielectric Constant Width/Height (W/d)
4.80
4.00
2.55
Page 4
Effective Dielectric
Constant
3.59
3.07
2.12
Characteristic
Impedance
50.0
51.0
48.0
Absolute Maximum Solder Times
Hand-Solder Temp. TX +225°C for 10 Sec.
Hand-Solder Temp. RX +225°C for 10 Sec.
Recommended Solder Melting Point +180°C
Reflow Oven: +340°C Max. (See adjoining diagram)
Page 5
1.8
2.0
3.0
2.4GHZ TEST BOARD
30
2.4GHz TYPICAL VSWR
S11 SWR
1.681
2.4GHz TAPE DIMENSIONS
D1
P5
P4
D2
T2
(Top and Bottom Layers)
Ground Plane
20
P2
W
P3
F
5°
1.2
50Ω Transmission Line
30
P1
5°
A0
3.1
Units: mm
Board Thickness: 0.031”
Board Material: FR-4
14
14
CENTER 2 450.000MHz
SPAN 100.000MHz
868 & 916MHz TEST BOARD
Board Thickness: 0.062”
Board Material: FR-4
T4
3.30”
(84mm)
0.89”
(23mm)
Symbol
A0
0.17”
(4mm)
0.08”
(2 mm)
xxx
Dimension
2.30
1.50
1.50
6.60
8.00
7.50
1.75
4.00
2.00
0.30
1.30
16.00
Tolerance
±0.10
+0.10
-0.00
+0.25
-0.00
±0.10
±0.10
±0.10
±0.10
±0.10
±0.10
±0.05
±0.10
±0.10
Unit
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
D1
1.50”
(38mm)
D2
F
P1
P2
P3
P4
P5
T2
T4
W
868MHz TYPICAL VSWR
S11 SWR
1.229
916MHz TYPICAL VSWR
S11 SWR
1.177
CENTER 868.000MHz
SPAN 100.000MHz
CENTER
916.000MHz
SPAN 100.000MHz
Page 6
Page 7
868MHz AND 916MHz TAPE DIMENSIONS
D1
P3
P2
W
F
P5
P4
D2
T2
REEL DIMENSIONS
W1
E
P1
C
T4
T3
B
Symbol
D1
D2
F
P1
P2
P3
P4
P5
T2
T3
T4
W
Dimension
1.50
1.50
10.6
8.00
11.50
1.75
4.00
2.00
0.30
3.30
1.90
24.00
Tolerance
±0.10
±0.10
±0.10
±0.10
±0.10
±0.10
±0.10
±0.10
±0.05
±0.10
±0.10
±0.30
Unit
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
Symbol
QTY per Reel
Tape Width
A
B
C
E
W
W1
A
W
868/916MHz
3,000
24
330±1
100±0.5
13±0.5
2.2±0.5
24±0.5
28.9±0.2
2.45GHz
1.500
16
180±1
62±0.5
13±0.2
2.2±0.5
16±0.5
20±0.2
Unit
pcs
mm
mm
mm
mm
mm
mm
mm
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