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Filtering & Frequency Selection•2-Port Notch

Band-Stop Filter (Notch / Trap)

Deep attenuation notch for eliminating specific high-power interfering carriers.

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Band-Stop Filter (Notch / Trap) — Photorealistic 3D PCB Hardware Render
NIKOLARF
Insertion Loss
< 0.25 dB in passbands outside the notch
Isolation / Return Loss
> 45 dB deep rejection notch at f_notch
Bandwidth
Narrow stopband (2% - 8% notch width)
Power Rating
High (Pure planar copper microstrip)

Device Topology & Electromagnetic Behavior

Employs open-circuited quarter-wavelength shunt stubs or spurline coupled resonators that act as a dead short-circuit at the notch frequency. Preserves low insertion loss across all surrounding spectrum while carving a >45 dB suppression notch at the interfering frequency (e.g. 2.4 GHz Wi-Fi notch in a 5 GHz radar).

ANALYTICAL FORMULATIONS & S-MATRIX MAPPING
ell_stub = (λ_g) / (4) = (c) / (4 f_notch) √(varepsilon_eff)
• Quarter-wave open stub transforms open-circuit into zero-ohm short to ground at f_notch.
Z_in, stub = -j Z_stub cot(beta ell) = 0 when beta ell = (π) / (2)
• Presents zero impedance at notch frequency, shunting all RF power to ground.
Recommended Substrate Stackup

Rogers RT/duroid® 6002 (low TCDk) to prevent notch center drift over temperature.

Nikola RF Fabrication Directives
  • Fine laser trimming of stub tips for precision notch frequency alignment.
  • Cascade multiple stubs with λ/4 spacing to broaden notch depth to >60 dB.
Full-Lifecycle Engineering Services

Design, 3D EM Simulation & Handoff for Band-Stop Filter (Notch / Trap)

We provide turnkey synthesis, multi-frequency full-wave simulation, and fabrication-ready packaging for the Band-Stop Filter (Notch / Trap).

1. 3D Full-Wave FEM Modeling

Complete Ansys HFSS 3D CAD modeling with true edge-launch SMA or SMP connectors, via fence stitching, and adaptive mesh refinement down to ΔS < 0.007.

2. Sensitivity & Tolerance Sweeps

Monte Carlo statistical analysis over copper etching tolerances (±15 µm) and substrate permittivity variations to guarantee first-pass high-yield manufacturing.

3. Manufacturing Handoff

Delivery of verified simulation models, parameterized layout geometries, and photolithography-compliant Gerber RS-274X fabrication packages.

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Submit your operational frequency, bandwidth, power handling, and target substrate stackup. Our electromagnetic engineers will deliver a verified feasibility audit within 48 hours.

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We treat client intellectual property with military-grade rigor. Prior to receiving proprietary disclosure files, patent drafts, or trade secret geometries, we execute standard bilateral NDAs.

Bilateral NDA Standard

Mutual non-disclosure executed before file transmission.

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Simulations run on dedicated air-gapped workstations.

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Computational Electromagnetics • Microwave Co-Design • Strict Engineering Confidentiality