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

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SARK-110 Antenna Analyzer 100kHz to 230MHz

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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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Specifications:

General	· 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
Markers	Tracking modes: Peak Min, Peak Max, Absolute Min, Absolute Max , Value Cross Any, Value Cross Up, Value Cross Down
Interface	· 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)
Storage	· 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
Calibration	· 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
Processor	72 MHz STM32 MCU with 256KB Flash and 48KB SRAM
Power	· 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
Environment	Operating temperature: 0ºC to 50ºC
Dimensions	98 * 60 * 14.5 (mm)
Weight	120g
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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Account Name: Xiamen Talinfone Comm Co., Ltd.

Bank Name: Citibank N.A., Hong Kong Branch

Bank Address: 3 Garden Road, Central, Hong Kong

Country/Region: Hong Kong

Type of Account: Business Account

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Branch Code: 391 * If paying from Hong Kong banks

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To one of the following accounts:

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Account Name: Xiamen Talinfone Comm Co., Ltd.

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Bank Address: Seventh Avenue, New York, NY 10019, US

Type of Account: Business account

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Please make a domestic payment via Fedwire to the account details below:

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