GrabCAD 模型信息
Ku-Band Gunn Diode Oscillator - 11 GHz · 模型 56950
# Ku-Band Gunn Diode Oscillator — 11 GHz 3D-printed waveguide-horn Gunn diode oscillator built around the **AA703A** Gunn diode. Horn is dimensioned for 10–12 GHz (Ku band), with a sliding plunger for frequency/output-matching tuning. Tested with a ДК-И2М detector diode + oscilloscope. ## Printed Parts Waveguide-horn, plunger, back wall — **PLA, 0.4 mm nozzle**. Horn's internal profile is dimensioned for best match near 11 GHz — don't scale the model uniformly. ## Making It Conductive PLA is a dielectric — metallize all RF surfaces after printing: - **Horn:** line internal walls with double-sided conductive copper foil. - **Plunger:** foil side walls + working face. - Reinforce foil seams with conductive silver-filled adhesive. **Fit-up:** hand-trim the plunger after foiling until it slides freely while keeping wall contact. Side-wall gap up to ~0.5 mm is fine; the broad-wall gap is critical — keep it tight. ## Fasteners - Back wall / diode contact plate: **heat-set M2 inserts**. - Diode is held only by screw-clamping pressure against the waveguide's bottom wall — no adhesive/solder. - Plunger drive: **M3 screw**, soldered thrust washer + jam nuts, bearing on a rear end cap with a heat-set **M3** insert. ## Polarity & Thermal ⚠️ AA703A should be heat-sunk on the **anode**. This unit's heatsink is on the cathode (experimental) — to fix: flip the diode and **reverse supply polarity** (horn foil becomes positive). Even anode-cooled, it's too hot for CW without a serious heatsink — this build uses **pulsed bias (1 kHz, 50% duty)**. ## Assembly 1. Print all parts; install M2/M3 inserts. 2. Foil + seal seams (horn interior, plunger). 3. Hand-fit plunger for free sliding + wall contact. 4. Assemble plunger drive (washer, jam nuts). 5. Mount diode per chosen polarity; clamp with retaining screw only. 6. Attach back wall (firm diode contact), then end cap. 7. Wire bias supply, correct polarity. ## Tuning Couple output to the detector diode near the aperture, watch on scope, apply pulsed bias, turn the plunger screw to maximize signal (tunes freq + matching together), lock with jam nuts. ## Notes Hobbyist source, not calibrated. Confirm polarity before power-up. Avoid close-range exposure to the aperture, as with any live microwave source.
- 格式
- SOLIDWORKS、Text file、Rendering、Other、STL、STEP / IGES
- 分类
- 3D printing、Educational、Electrical
- 标签
- waveguide、oscillator、ku-band、gunn diode、aa703a
- 数据更新
- 2026-09-26T02:56:16Z
