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Delay Lines
Microwave delay devices are designed and manufactured to meet delay requirements in
frequency ranges from UHF through KA-Band. Several techniques are used to achieve the
delays. It is the responsibility of the design engineer to decide about the best method for
delaying the signals in his particular application. The decision depends on the frequency
range, the delay needed, the VSWR, the suppression of undesired signals, the size of the
device and its form, and last but not least the price of the device will be an important factor.
The coaxial delay line is the classical device. The length of the delay line can easily be
calculated from the propagation delay of the signal within the coaxial cable and the delay
needed. Other advantages are the good electrical performance of the professional delay line,
the usually fast availability and the attractive price. Disadvantages are in some cases the
large size and the high insertion loss, especially for longer delays at higher frequencies.
Spectrum Elektrotechnik GmbH offers a wide variety of coaxial delay lines. All the designs
use Semi-Rigid Cable, from very small diameters, such as 0.047" up to diameters of 0.250",
for certain applications even bigger. The Semi-Rigid Cables are using either Solid Dielectric,
or Low Density Dielectric. The advantage of the Low Density Dielectric is lower insertion
loss, a wider temperature range and better performance over temperature.
All Delay Lines are made to the customer specifications: a specific delay that is needed in the
applications, a minimum attenuation, a maximum return loss, a minimum change over
temperature, a certain mechanical configuration and for an environment that often only allows
the best.
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Delay Lines Packaging Options
The delay line can be packaged in a number of different ways, such as:
An especially designed housing: It can be made of any kind of material, although
mostly used is excavated aluminum.
19" Rack Mounting: This is common for larger delay lines, or for applications in
laboratories or test sets.
Spool Mounting: This is an economical way of packaging, using a spool as
supporting and mounting fixture.
Free Coils: This is definitely the most inexpensive packaging, winding the delay line
in a free coil and then using either tape, plastic or stainless steel ties, or just solder,
to hold the delay line together.
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The following Table can be used as a quick reference. Comparing the data of the different
cables listed in attenuation, diameter, length and weight will allow a fast decision about
which cables may be suited best in a specific application.
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Quick Response Manufacturing
The Quick Response Manufacturing is another good example for the commitment to providing
excellent Customer Service. The Quick Response Group was implemented to react
immediately to customers' needs. Sometimes Products will be shipped within 24 hours. All
Products manufactured in the Quick Response Area will meet the same Quality Standard as
all the other products, they are submitted to the same inspection criteria, they are tested with
the same procedures as used on standard products.
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