Filters
Series UV22CO Combline Band-Pass Filters,
0.5 - 18 GHz, 2 - 67% Bandwidth
Miniature or Standard
•
Exact Synthesis Design
•
Small Size
•
Spurious at Only Four Times the Passband
Description
The design of these particular filters is based on the exact synthesis theory.
Utilizing combline filter techniques, these components offer high selectivity up through the third
harmonic of the highest frequency in the pass-band. The use of resonators, smaller than a quarter
wavelength, produces spurious pass-bands only at four times the fundamental pass-band (typical).
Specifications
Parameter
Center Frequency Range (FO)
3 dB Relative Bandwidth
Number of Sections
Impedance
VSWR at FO
Insertion Loss
Stopband Rejection
Average Input Power
Connectors
Size
Temperature Range
Specification
0.5 to 18 GHz
2 to 67%
3 to16
50 ohms
1.5:1 typical
Related to bandwidth and number of sections (see Figure 14)
Related to bandwidth and number of sections (see rejection
curves, Figures 15 to 19)
2W - 100W
SMA, BNC, TNC, N
Related to bandwidth and number of sections (details upon
request)
0° to +50° (standard)
How to order
Standard Models
Please specify your order by stating the model number according to the specifications table and the
example below:
UV22CO 7 2200 400 SF SF
/
− −
−
−
1
2
3
4
5
6
Legend:
1: Basic model number (UV 22CO)
2: Number of sections
3: Center frequency (MHz)
4: 1 dB relative bandwidth (MHz)
5: Input connector code
6: Output connector code
Connector
SMA
BNC
TNC
N
39
Code
Male
Female
SM
BM
TM
NM
SF
BF
TF
NF
Filters
Custom Models
Please specify your order by following the example below:
a. Determination of Insertion Loss
The typical insertion loss at center frequency is determined as follows:
LC ( N + 0.4)
+ b dB
1 dB BW (%)
Where: LC = Loss Constant (see Figure 14)
0
0.25
0.30
0.40
b=
1 dB BW (%) =
up to 10% BW
11 to 30% BW
31 to 40% BW
41 to 67% BW
1 dB BW (MHz) × 100
Center Frequency (MHz)
Loss Constant
N = Number of sections
Center Frequency (GHz)
Figure 14. Loss Constant vs Center Frequency
b. Rejection Curves and Determination of Number of Sections
The rejection frequency is plotted in steps of 1 dB BW from the center frequency (FO):
The number of 1 dB bandwidth = W
W± =
Rejection Frequency (MHz) - FO (MHz)
Minimum 1 dB BW (MHz)
Example:
Center frequency
2200 MHz
1 dB BW
400 MHz
Rejection at 1600 and 2800 MHz 50 dB min.
1 dB relative bandwidth will be:
400 ×100
= 18.2%
2200
Therefore, use the value of W to find the number of the required sections from Figure 19:
F − FO 2800 − 2200
FAL − FO 1600 − 2200
=
= −1.5 and AH
=
= +1.5
1 dB BW
400
1 dB BW
400
We see that than 7 sections are required.
From Figure 14 the Loss Constant is 0.72. Then the Insertion Loss at Center Frequency will be:
0.72 × (7 + 0.4)
+ 0.25 = 0.55 dB
18.2
The part number will be:
UV22 CO 7 2200 400 SF SF
/
− −
−
−
1
2
3
4
5
6
Legend:
1: Basic model number (UV22 CO)
2: Number of sections
3: Center frequency (MHz)
4: Relative 1 dB bandwidth (MHz)
5: Input connector code
6: Output connector code
40
Filters
Figure 15. Rejection Curves, (dBs),
1dB BW = 5%
Figure 16. Rejection Curves (dBs),
1 dB BW = 10%
No. of 1 dB Bandwidths
No. of 1 dB Bandwidths
Figure 17. Rejection Curves (dBs),
1 dB BW = 20%
Figure 18. Rejection Curves (dBs),
1 dB BW = 40%
No. of 1 dB Bandwidths
Figure 19. Rejection Curves (dBs),
1dB BW = 40% to 67%
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Filters
Example:
UV22CO-7-2200/400-SF-SF, Combline Band-Pass
Filter, 2000-2400 MHz
Description
This low insertion loss with high rejection combline Band-Pass filter utilizes small high "Q"
resonators, extending the high selectivity through the third harmonic of the highest frequency in the
passband.
Electrical Specifications @ Temp.=25°C
Parameter
Center Frequency
Insertion Loss at Center Frequency
Pass-Band
Pass-Band Insertion Loss
Pass-Band Ripple
Pass-Band VSWR
Out-of-Band Rejection @DC-1750 MHz
Out-of-Band Rejection @2700 MHz
Out-of-Band Rejection @3000-4000 MHz
Out-of-Band Rejection @4000-7200 MHz
Input/Output Impedance
RF Power Capability
Specification
Unit
2200
0.8
2000-2400
1.3
±0.5
1.5:1
35
35
65
75
50
4
MHz
dB
MHz
dB
dB
Note
dB
dB
dB
dB
Ohm
W
Max.
Max.
Max.
Min.
Min.
Min.
Min.
Nominal
CW
Min
Max
Unit
-40
+90
°C
Max.
Environmental Characteristics
Parameter
Operating Temperature
Mechanical Specifications
Parameter
Dimensions LxWxD
RF Input/Output Connectors
Material
Specification
Note
62x29x15 mm
SMA, female, removable
Aluminum/brass,
silver plated
Approximately
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