4Bxxxxx-xxxx-4LM中文资料
4B Series
SPECIFICATIONS STANDARD*SPECIAL
ELECTRICAL
Center Frequency (Fc)
4000 to 12000 Mhz12000 to 18000 MHz 3dB Relative Bandwidth (% of FC) 3 to 20 2 to 70
Number of Sections Available 3 to 8 2 to 14
Nominal Impedance50 Ohms50 Ohms Maximum Insertion Loss See Curve See Curve Maximum VSWR 1.5/1 1.3/1
Attenuation in the Stopband See Graph See Graph
Maximum Input Power (Average)(Watts to
10,000 ft.)
10% if peak See Standard
Maximum Input Power (Peak)(Watts to 10,000 ft.)500 x 3 dB BW (MHz)
divided by Fc (MHz)
See Standard
ENVIRONMENTAL
Shock
25 G's50 G's Vibration10 G's20 G's Humidity90% relative100% relative
Altitude Unlimited Unlimited
Temperature Range (Operating)-25 to + 50 degrees
celsius
-54 to + 100 degrees
celsius
Temperature Range (Non-Operating)-54 to + 70 degrees
celsius
-54 to +150 degrees
celsius
MECHANICAL
Approximate Weight in oz.
0.5 x H x L0.5 x H x L
Mounting Provisions See below See below
Special Configurations Consult Factory Consult Factory
INSERTION LOSS:
The Maximum Insertion Loss at
center frequency is equal to :
LF x (N + 0.5)
divided by
%3 dB BW + 0.1
Where:
LF= Loss Factor
N= Number of Sections
% 3dB BW:
3dB BW (Mhz) x 100
divided by
Center Frequency (MHz)
Example:
A 5 section 4
B with a center
frequency of 10000 MHz and a 3dB
BW of 500 MHz would have,
1.45 x 5.5divided by 5 = 1.6
1.6 + 0.1 = 1.7 dB
MECHANICAL SPECIFICATIONS
L Dimension = N x (0.3 + 0.5/%BW) + 0.5 inch Approx W Dimension = 1450/Fc(MHz) + 0.3 inch Approx.
Lark Code Type C DIM.
Inches & MM
Lark
Code
Type C DIM.
Inches & MM
A SMA JACK.375 & 9.5M Solder Pin Radial.070 & 1.8
B SMA PLUG.507 & 12.9S SPECIAL
L SOLDER PIN
AXIAL
.070 & 1.8
The size shown is a standard used by Lark to facilitate a low cost, easily reproducible unit. Should you require another size, please submit all of your requirements-both electrical and mechanical. This will enable Lark Engineering to quote the
optimum design for your application.
STOPBAND SPECIFICATIONS
The graphs on the following pages define the normal specification limits on attenuation Lark bandpass filter series 2B, 3B, and 4B. The minimum level of attenuation in dB is shown as a "number of 3dB bandwidths from center frequency".
Since the frequency characteristics vary for differing bandwidths, it is
necessary to establish specifications for each bandwidth of filter. The different graphs represent various 3dB percentage bandwidths. Intermediate values should be interpolated. The 3dB percentage bandwidth is defined as follows:
3dB Bandwidth (MHz) x 100
divided by
Center Frequency (MHz)
The exact relationship is as follows:
1. 3dB Bandwidths From Center Frequency= Rejection Frequency (Mhz) -Center Frequency (Mhz) divided by 3dB Bandwidth (Mhz)Example:Given:
2. Center Frequency = 5000 MHz Minimum 3dB Bandwidth = 500 MHz Number of Sections = 5
Find: Minimum attenuation levels at 4250 MHz and 5800 MHz.
3dB BW's from Fc = 4250 - 5000 / 500 = - 1.5
and 5800 - 5000 / 500 = + 1.6The answer can be read directly from the 10% graph. Using the 5 section curve at the point -1.5 (4250 MHz) we find the minimum level of attenuation is 40dB.At +1.6 (5800 MHz) the minimum level of attenuation is 50dB.For special requirements, please contact our Application Engineering Department.
Lark Engineering Stopband Specifications
元器件交易网https://www.wendangku.net/doc/7815774120.html,
STOPBAND SPECIFICATIONS
STOPBAND SPECIFICATIONS
Lark Engineering Stopband Specifications
元器件交易网https://www.wendangku.net/doc/7815774120.html,
STOPBAND SPECIFICATIONS