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  Home >> Radio Accessory >> Antenna Analyzer >> SARK-110 Antenna Analyzer 100kHz to 230MHz

SARK-110 Antenna Analyzer 100kHz to 230MHz [Comments(0)|Leave your Comment]
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SARK-110 Antenna Analyzer 100kHz to 230MHz

The SARK-110 antenna analyzer is a convenient tool for the measurement of antennas for HF RFID applications because features such as the graphical representations of the impedance, the determination of the sign of the reactance, and good accuracy characteristics. Besides, starting from firmware version v0.8.3.2 the analyzer implements a very convenient feature for this kind of applications, which is the automatic calculation of the equivalent circuit model of small loop antennas or coils.

The purpose of this application note is describing the step by step procedure of the use of the SARK-110 for this application using a practical example. This procedure will consist in the measurement of a 13.56 MHz RFID reader printed coil antenna, the determination of the equivalent circuit model and the matching to the reader output impedance, 50-ohm in this case.

The RFID antenna used in this application note is realized as a printed coil on a FR-4 board substrate. The series equivalent circuit is used to simulate the antenna in a RF simulation software and calculate the matching network. I have used the freely available RFSim99 simulator, but any other suitable simulation software can be used. After designing the matching network the simulation results are verified with the measurement results. 

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·         Frequency range: 100 kHz to 230 MHz

·         Frequency resolution: 1 Hz

·         Frequency stability: ± 30 ppm

·         Sine wave output

·         RF Connector: MCX socket

·         Output power: approx. -10 dBm (0.1mW, 70.7mV rms) into a 50-ohm load

·         Sweep time (Scalar Chart/Smith Chart/Field Mode): 3 seconds (Normal/fast sampling), 5 seconds (Double/slow sampling), 1.5 seconds (Normal/low resolution)

·         Sweep time (FDR): 6 seconds

·         Frequency Resolution: 258 points per sweep (258 to 10000 in deep sweep mode)

·         Return loss dynamic range: 0 to -60 dB

·         VSWR dynamic range: 100:1 maximum

·         Impedance reading in open circuit: 60000 (@1 MHz)

·         Measurement limits: |Z| < 100K, |R| < 100K, |X| < 100K, |Rho| < 0.98, C < 100 nF, L < 100 mH, -180 < ? < 180

Measured Parameters

Complex impedance (series and parallel) and reflection coefficient in rectangular and polar form, VSWR, return loss, reflection power percentage, quality factor, equivalent capacitance, equivalent inductance

Operating Modes

Scalar Chart, Smith Chart, Single Frequency, Cable Test (TDR), Field, Multi-band, Signal Generator, Computer Control and Band Scan

Features Common To Most Modes

·       Presets for amateur radio bands

·       Adjustable reference impedance

·       Save to disk and recall functions

·       Three available fixed scale options and automatic scaling

·       Presets for popular coaxial cables

·       Add/subtract transmission line

·       Black or white color schemes

·       Adjustable plot trace widths

Scalar Chart Mode

·       Graphical plot of two user-selected parameters in a rectangular chart

·       Two markers with manual or automatic positioning

·       Display detailed parameters for center frequency or any of the two marker positions

Smith Chart Mode

·       Plots complex reflection coefficient in Smith Chart form

·       Two markers with manual or automatic positioning

·       Display detailed parameters for center frequency or either of the two marker positions

Single Frequency Mode

·       Display all parameters for a single frequency

·       Graphical representation of series and parallel impedance equivalent

·       VSWR Audio feedback

·       Circuit models and automatic LC matching network calculator

Cable Test Mode

·       Range: about from 2 to 250 m

·       Displays step and impulse responses

Field Mode

·       Graphical plot of one user-selected parameter in a scalar chart with enhanced legibility

·       Display max and min values

Multi-band Mode

Display rectangular charts for four bands simultaneously

Signal Generator Mode

·       Frequency range: 1 kHz to 230 MHz

·       Programmable output level from -73 dBm to -10 dBm into a 50-ohm load

·       Continuous, frequency sweep, AM and FM modulation modes

·       Linear, logarithmic, bi-linear, and bi-logarithmic sweep modes


Tracking modes: Peak Min, Peak Max, Absolute Min, Absolute Max , Value Cross Any, Value Cross Up, Value Cross Down


·       Full color 3” TFT LCD 400 x 240 pixels

·       4 dedicated buttons

·       2 navigation keys

PC Interface

·       USB Mini-B receptacle

·       USB 2.0 Full Speed Composite Device:

o        Mass Storage Class (internal disk)

o        HID Class (Computer Control mode)


·       2 MB internal disk FAT compatible

·       USB Mass Storage

·       Screenshot save and recall feature

·       Measurement data save and recall feature

·       Possibility of files with user definable frequency presets, scale settings, and three custom cable types

·       Measurement data files compatible with SARK Plots and ZPLOTS programs


·       Automated Open/Short/Load calibration with up to eight stored profiles

·       400 calibration points

·       Frequency calibration

Measurement Architecture

·       Single conversion superheterodyne

·       Two independent measurement channels for simultaneous voltage and current measurement for precise phase measurement

·       Two synchronized 12-bit analog to digital converters


72 MHz STM32 MCU with 256KB Flash and 48KB SRAM


·       3.7V 1000mAh Internal Lithium-Polymer battery

·       USB for operation and charging

·       Automatic Power Off functionality (disabled, 5, 10, or 30minutes)

·       Autonomy: approx. 2.5 hours

·       Charge time: approx. 3.5 hours


Operating temperature: 0ºC to 50ºC


98 * 60 * 14.5 (mm)



Package Content

·       SARK-110 x 1 (with built-in battery)

·       MCX to SMA female connector adapter x 1

·       SMA plug to SMA female 8” (20-cm) cable adapter x 1


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