RF PCB Test Capabilities
ASC offers printed circuit board inspections including PCB testing and certification. We offer a full range of RF Testing services.
- Frequency Range
- DC – 6 Ghz, ISM Bands, 802.11x, Bluetooth, cellular, commercial, industrial
- One Milliwatt to 1500 Watts output power
- Current Drain
- Milliamps to 50 Amperes of current
- Voltage Levels
- 2.7 Volts to 50 Volts of supply voltage
- Class C Non-linear Amplifiers and Linear Power Amplifiers
- Typical Amplifier Gain
- From 10 db gain to 60 db gain
- Input Levels
- -110 dbm to +50 dbm input
- AGC
- Automatic gain control and level setting tests
- Feed Forward
- RF feed forward testing with level setting for best linearity
- RF Detectors
- In-Circuit testing of detection circuitry and levels
- VSWR Control
- System testing of VSWR circuitry with various load conditions
- Heat Sensing Controls
- Testing of control circuits required for thermal protection
- P1 db Compression Testing
- Testing of linear amplifiers for P1 compression level
- IM, Harmonic, Modulation Mask for FSK, ASK, OOK, CDMA, GSM, Bluetooth
- Capability to measure intermodulation, harmonic, and various modulation masks
- Integration of µCs into RF Amplifier
- µ-Controller-enabled and controlled amplifiers – gain, level setting, features
- FCC – IC – ETSI - CE Testing
- Full test support for meeting various country requirements
- Dedicated Test Fixtures
- Board level, module level, product level support
- Fully Automated Test Rack and Dedicated Support Software
- Test pass and fail criteria, fully programmable, fully automated, test report generation, database generation, FTP server capable, remote control and access for monitoring and updates
- Fully Automated Burn-In Test Rack and Dedicated Software
- Fully programmable test and burn-in parameters, fully automated test report generation, database generation, FTP server capable, remote control and access for monitoring and updates
Frequently Asked Questions
RF microwave PCB electrical testing at the fabrication level focuses on verifying controlled impedance and passive RF performance of the bare board. Time Domain Reflectometry (TDR) measurement on test coupons validates characteristic impedance against design targets, typically to ±5% or ±10% tolerance. For more comprehensive RF characterization, Vector Network Analyzer (VNA) S-parameter measurements (S11 return loss, S21 insertion loss) on specific transmission line coupons verify substrate loss at the operating frequency. These measurements confirm that material Dk, Df, and conductor dimensions, as actually fabricated, align with design simulations. Testing bare boards before assembly avoids costly assembly rework on electrically non-conforming substrates. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
Controlled impedance verification uses TDR (Time Domain Reflectometry) on test coupons fabricated alongside the production boards in the same panel. Each coupon replicates the exact trace geometry and layer stackup of the production signal layer being controlled. TDR measures the step response of the transmission line and computes characteristic impedance from the reflection waveform. Standard achievable impedance tolerance in production is ±10% for most applications. For high-frequency RF and matched-impedance designs requiring better control, ±5% tolerance is achievable with calibrated, stable processes and premium dielectric materials. UHDI semi-additive processes achieve better than 5% due to superior trace profile consistency compared to subtractive etching. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
RF test coupons are scaled replicas of critical transmission line structures on a PCB, fabricated in the panel border alongside production boards. They serve as proxies for the actual product because destructive testing of coupons is more practical than testing populated or finished boards. Coupons verify: characteristic impedance of each controlled impedance layer via TDR; differential pair impedance and intra-pair skew via differential TDR; microwave insertion loss and return loss via S-parameter measurement (for RF applications); and material dielectric properties via resonance methods for high-frequency process verification. Coupon results provide objective evidence of process control for each fabrication lot, supporting IPC Class 3 and aerospace quality documentation requirements. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
RF test coupons are scaled replicas of critical transmission line structures on a PCB, fabricated in the panel border alongside production boards. They serve as proxies for the actual product because destructive testing of coupons is more practical than testing populated or finished boards. Coupons verify: characteristic impedance of each controlled impedance layer via TDR; differential pair impedance and intra-pair skew via differential TDR; microwave insertion loss and return loss via S-parameter measurement (for RF applications); and material dielectric properties via resonance methods for high-frequency process verification. Coupon results provide objective evidence of process control for each fabrication lot, supporting IPC Class 3 and aerospace quality documentation requirements. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
S-parameter (Scattering parameter) testing measures the RF transmission and reflection characteristics of a PCB transmission line or network using a Vector Network Analyzer (VNA). S11 (return loss) describes how much incident signal reflects back from an input port, a measure of impedance matching. S21 (insertion loss) describes how much signal is transmitted from one port to another, a measure of total loss through the transmission path including conductor loss, dielectric loss, and radiation. S-parameter testing is required for RF PCBs operating above 1 GHz where insertion loss and return loss directly affect system link budget, filter performance, or antenna matching. It is standard practice for aerospace radar boards, phased array subassemblies, and telecommunications RF front-ends. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
In-house RF test capability at the fabrication facility eliminates shipping and third-party lab scheduling delays that add days or weeks to design validation cycles. Engineers can receive bare board RF test data, TDR coupon results, insertion loss measurements, impedance maps, concurrently with board shipment rather than waiting for a separate lab engagement. When test data reveals a process issue (e.g., dielectric thickness out of tolerance affecting impedance), the fabricator can immediately investigate root cause and implement corrections in the same or next fabrication run. This feedback speed is critical during RF product development, where multiple design iterations may be needed to converge on target RF performance. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
RF and microwave PCBs requiring specialized testing beyond standard continuity and isolation electrical testing include: phased array antenna substrates requiring phase-matched transmission lines (S-parameter phase measurements across multiple paths); millimeter-wave boards (above 30 GHz) requiring high-frequency VNA measurement up to 110 GHz or beyond; boards incorporating cavity resonators or filters requiring resonant frequency and Q-factor measurement; and power amplifier boards with plated-through-hole connections to metal carriers requiring contact resistance measurement at the carrier interface. RF metal-backed assemblies also require thermal resistance measurement to verify bond quality between the RF PCB and the metal carrier — a critical parameter for power dissipation. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
Material property verification on fabricated RF boards uses coupon-based test methods that extract effective Dk and Df values from the actual laminate as processed, including the effects of copper foil surface roughness, prepreg flow, and process induced material changes. Resonant cavity methods (ring resonators, split cylinder resonators) extract Dk and Df at specific frequencies from coupons built on the production panel. These measured values are then compared to the laminate manufacturer's specifications. Deviations indicate material substitution, process induced material degradation, or measurement anomalies. For critical aerospace or defense RF programs, material verification via coupon testing is often a contractual deliverable alongside standard dimensional and impedance testing. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
IPC-6018 is the performance specification for high-frequency (microwave) printed boards, covering acceptance requirements for fabricated RF PCBs. Key electrical requirements include: impedance continuity verification per net; characteristic impedance within specified tolerance (typically ±10% standard, ±5% for precision); dielectric withstanding voltage test at specified voltage per net isolation requirement; and insulation resistance measurement. For Class 3 microwave boards, 100% electrical test (opens and shorts on every net) is required in addition to controlled impedance coupon testing. IPC-6018 also specifies microsection examination requirements to verify conductor geometry, plating thickness, and via quality consistent with the target impedance. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
Insertion loss (S21) on RF PCB transmission lines is measured using a calibrated Vector Network Analyzer (VNA) with calibrated probes or test fixtures that contact the microstrip or stripline transmission line coupon. The VNA sweeps from a low frequency to the maximum operating frequency, measuring S21 dB loss per unit length (expressed as dB/inch). Loss is decomposed into conductor loss (dominant below 5 GHz) and dielectric loss (dominant above 10 GHz). Smooth copper foil test structures isolate conductor roughness contributions. For production acceptance, a maximum insertion loss limit per frequency point is specified on the controlled impedance test documentation. Results exceeding the limit trigger material or process investigation. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
Time Domain Reflectometry (TDR) sends a fast-rise-time step signal down a transmission line and measures reflections returning from impedance discontinuities. The time of the reflection identifies its location along the line, while the reflection magnitude and polarity identify the nature of the discontinuity, capacitive (pad stubs, via pads) produce negative-going reflections; inductive discontinuities (via barrels, connector transitions) produce positive-going reflections; open circuits reflect full amplitude; and impedance mismatches produce proportional reflections. For RF PCB quality control, TDR confirms that each controlled impedance line meets its target impedance across its full length, validating that trace width, dielectric thickness, and material Dk are all within specification as actually fabricated. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
RF microwave PCB electrical testing at the fabrication level focuses on verifying controlled impedance and passive RF performance of the bare board. Time Domain Reflectometry (TDR) measurement on test coupons validates characteristic impedance against design targets, typically to ±5% or ±10% tolerance. For more comprehensive RF characterization, Vector Network Analyzer (VNA) S-parameter measurements (S11 return loss, S21 insertion loss) on specific transmission line coupons verify substrate loss at the operating frequency. These measurements confirm that material Dk, Df, and conductor dimensions, as actually fabricated, align with design simulations. Testing bare boards before assembly avoids costly assembly rework on electrically non-conforming substrates. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
Controlled impedance verification uses TDR (Time Domain Reflectometry) on test coupons fabricated alongside the production boards in the same panel. Each coupon replicates the exact trace geometry and layer stackup of the production signal layer being controlled. TDR measures the step response of the transmission line and computes characteristic impedance from the reflection waveform. Standard achievable impedance tolerance in production is ±10% for most applications. For high-frequency RF and matched-impedance designs requiring better control, ±5% tolerance is achievable with calibrated, stable processes and premium dielectric materials. UHDI semi-additive processes achieve better than 5% due to superior trace profile consistency compared to subtractive etching. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
RF test coupons are scaled replicas of critical transmission line structures on a PCB, fabricated in the panel border alongside production boards. They serve as proxies for the actual product because destructive testing of coupons is more practical than testing populated or finished boards. Coupons verify: characteristic impedance of each controlled impedance layer via TDR; differential pair impedance and intra-pair skew via differential TDR; microwave insertion loss and return loss via S-parameter measurement (for RF applications); and material dielectric properties via resonance methods for high-frequency process verification. Coupon results provide objective evidence of process control for each fabrication lot, supporting IPC Class 3 and aerospace quality documentation requirements. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
RF test coupons are scaled replicas of critical transmission line structures on a PCB, fabricated in the panel border alongside production boards. They serve as proxies for the actual product because destructive testing of coupons is more practical than testing populated or finished boards. Coupons verify: characteristic impedance of each controlled impedance layer via TDR; differential pair impedance and intra-pair skew via differential TDR; microwave insertion loss and return loss via S-parameter measurement (for RF applications); and material dielectric properties via resonance methods for high-frequency process verification. Coupon results provide objective evidence of process control for each fabrication lot, supporting IPC Class 3 and aerospace quality documentation requirements. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
S-parameter (Scattering parameter) testing measures the RF transmission and reflection characteristics of a PCB transmission line or network using a Vector Network Analyzer (VNA). S11 (return loss) describes how much incident signal reflects back from an input port, a measure of impedance matching. S21 (insertion loss) describes how much signal is transmitted from one port to another, a measure of total loss through the transmission path including conductor loss, dielectric loss, and radiation. S-parameter testing is required for RF PCBs operating above 1 GHz where insertion loss and return loss directly affect system link budget, filter performance, or antenna matching. It is standard practice for aerospace radar boards, phased array subassemblies, and telecommunications RF front-ends. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
In-house RF test capability at the fabrication facility eliminates shipping and third-party lab scheduling delays that add days or weeks to design validation cycles. Engineers can receive bare board RF test data, TDR coupon results, insertion loss measurements, impedance maps, concurrently with board shipment rather than waiting for a separate lab engagement. When test data reveals a process issue (e.g., dielectric thickness out of tolerance affecting impedance), the fabricator can immediately investigate root cause and implement corrections in the same or next fabrication run. This feedback speed is critical during RF product development, where multiple design iterations may be needed to converge on target RF performance. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
RF and microwave PCBs requiring specialized testing beyond standard continuity and isolation electrical testing include: phased array antenna substrates requiring phase-matched transmission lines (S-parameter phase measurements across multiple paths); millimeter-wave boards (above 30 GHz) requiring high-frequency VNA measurement up to 110 GHz or beyond; boards incorporating cavity resonators or filters requiring resonant frequency and Q-factor measurement; and power amplifier boards with plated-through-hole connections to metal carriers requiring contact resistance measurement at the carrier interface. RF metal-backed assemblies also require thermal resistance measurement to verify bond quality between the RF PCB and the metal carrier — a critical parameter for power dissipation. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
Material property verification on fabricated RF boards uses coupon-based test methods that extract effective Dk and Df values from the actual laminate as processed, including the effects of copper foil surface roughness, prepreg flow, and process induced material changes. Resonant cavity methods (ring resonators, split cylinder resonators) extract Dk and Df at specific frequencies from coupons built on the production panel. These measured values are then compared to the laminate manufacturer's specifications. Deviations indicate material substitution, process induced material degradation, or measurement anomalies. For critical aerospace or defense RF programs, material verification via coupon testing is often a contractual deliverable alongside standard dimensional and impedance testing. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
IPC-6018 is the performance specification for high-frequency (microwave) printed boards, covering acceptance requirements for fabricated RF PCBs. Key electrical requirements include: impedance continuity verification per net; characteristic impedance within specified tolerance (typically ±10% standard, ±5% for precision); dielectric withstanding voltage test at specified voltage per net isolation requirement; and insulation resistance measurement. For Class 3 microwave boards, 100% electrical test (opens and shorts on every net) is required in addition to controlled impedance coupon testing. IPC-6018 also specifies microsection examination requirements to verify conductor geometry, plating thickness, and via quality consistent with the target impedance. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
Insertion loss (S21) on RF PCB transmission lines is measured using a calibrated Vector Network Analyzer (VNA) with calibrated probes or test fixtures that contact the microstrip or stripline transmission line coupon. The VNA sweeps from a low frequency to the maximum operating frequency, measuring S21 dB loss per unit length (expressed as dB/inch). Loss is decomposed into conductor loss (dominant below 5 GHz) and dielectric loss (dominant above 10 GHz). Smooth copper foil test structures isolate conductor roughness contributions. For production acceptance, a maximum insertion loss limit per frequency point is specified on the controlled impedance test documentation. Results exceeding the limit trigger material or process investigation. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.
Time Domain Reflectometry (TDR) sends a fast-rise-time step signal down a transmission line and measures reflections returning from impedance discontinuities. The time of the reflection identifies its location along the line, while the reflection magnitude and polarity identify the nature of the discontinuity, capacitive (pad stubs, via pads) produce negative-going reflections; inductive discontinuities (via barrels, connector transitions) produce positive-going reflections; open circuits reflect full amplitude; and impedance mismatches produce proportional reflections. For RF PCB quality control, TDR confirms that each controlled impedance line meets its target impedance across its full length, validating that trace width, dielectric thickness, and material Dk are all within specification as actually fabricated. American Standard Circuits specializes in advanced HDI PCB fabrication and engineering support.