Standing wave measurement
(Click figure to enlarge)
Standing wave distribution in cavity
(Click figure to enlarge)
Microwave power measurement
(Click figure to enlarge)
Resonance curve with sample in cavity
(Click figure to enlarge)
Waveguide wavelength measurement
(Click figure to enlarge)
Measurement of ε and tan(δ) of media
(Click figure to enlarge)
Note: oscilloscope not included
Features
Comprehensive microwave waveguide experiments
Various waveguide components
High quality microwave devices
Dielectric material samples included
Introduction
This experimental system is designed to measure microwave parameters, suitable for modern physics or electrical engineering teaching at colleges and universities. It consists of various microwave waveguide components at three-centimeter wavelength. The instruction manual contains comprehensive materials including experimental configurations, principles and step-by-step instructions. Please click Experiment Contents to find more information about this apparatus. Various experiments can be configured by selecting proper components, allowing students to conduct the following experiments:
1. Learn how to use various microwave devices and components
2. Understand microwave work states and transmission characteristics through waveguides
3. Understand field properties of microwave transmission paths
4. Measure standing wave, attenuation, wavelength (frequency), and power of microwave
5. Learn how to measure permittivity of microwave dielectric materials and tangent value of loss angle
Specifications
| Solid-state microwave signal source | |
| Frequency | range: 8.6 ~ 9.6 GHz; draft: ± 5×10-4/15 min; display error: ± 40 MHz |
| Output power | > 20 mW |
| Attenuation adjustment range | > 20 dB |
| Waveform | Equal amplitude |
| Internal modulation | square-wave; repetition frequency 1000 Hz |
| External modulation | polarity: +/-; amplitude: 5 ~ 40 VP-P; width: 0.2 ~ 3 μs; frequency: 300 ~ 3000 Hz |
| Narrow-band frequency scan | scan width: > 50 MHz; continuously adjustable |
| RF output connector | Type-N 50 Ω coaxial connector |
| Scan output | BNC connector, sawtooth wave output: 1 ~ 10 V |
| Slotted line measurement device | |
| Frequency range | 8.2 GHz ~ 12.4 GHz |
| Standing-wave coefficient | ≤ 1.03 (synthesis voltage) |
| Probe | travel: 95 mm; insertion depth: 1.5 mm |
| Frequency-selective amplifier | |
| Frequency range | 400 Hz ~ 10 kHz |
| Input voltage dynamic range | 10 μV ~ 2000 mV |
| Sensitivity | 10 μV (full scale) |
| Input impedance | 20 kΩ (1 kHz) |
| Centimeter wave power meter | |
| Frequency range | 8.6 GHz ~ 9.6 GHz |
| Power range | 100 μW ~ 100 mW |
| Microwave wavemeter | |
| Frequency range | 8.2 GHz ~ 12.4 GHz |
| Resolution | 0.005 GHz |
| Waveguides | |
| Cross section dimensions | inner: 22.86 mm × 10.16 mm (EIA: WR90 or IEC: R100) |
Parts List
| Description | Qty |
| Solid-state microwave signal source (@3 cm) | 1 |
| Slotted line measurement device (3 cm microwave) | 1 |
| Frequency-selective amplifier | 1 |
| Centimeter wave power meter | 1 |
| Variable attenuator | 1 |
| Wavelength meter | 1 |
| Detector | 1 |
| Cable | 1 |
| Detector display | 1 |
| Isolator | 2 |
| Circulator | 1 |
| Variable reactor | 1 |
| Single micrometer tuner | 1 |
| Straight waveguide | 1 |
| Matching load | 1 |
| Short-circuit plate | 1 |
| Resonant cavity | 1 |
| Coupler plate | 1 |
| Dielectric material sample | plastic glass, PTFE & black bakelite (3 pcs/ea) |
| Waveguide stand support | 3 |
| Screw | 40 |
| Instructional manual | 1 |
| Precision variable attenuator | 1 (option 1) |
| H-type 90 degree curve waveguide | 1 set (option 2) |
| H-type waveguide switch | |
| Straight waveguide (L=150) | |
| Directional coupler | |
| Mismatched load (VSWR 1.5 or 2.0) | |
| Mismatched load (VSWR 6-7) | |
| Passing through cavity |
Standing wave measurement
(Click figure to enlarge)
Standing wave distribution in cavity
(Click figure to enlarge)
Microwave power measurement
(Click figure to enlarge)
Resonance curve with sample in cavity
(Click figure to enlarge)
Waveguide wavelength measurement
(Click figure to enlarge)
Measurement of ε and tan(δ) of media
(Click figure to enlarge)
