Author name: Dolph

Waveguide bandwidth hinges on inner diameter (e.g., 3cm radius boosts TE₁₁ cutoff to 3.412cm, squeezing higher-mode onset), loss (TE₁₁ at 10GHz attenuates 0.015dB/m, narrowing usable range), and excitation purity—probes often stir multiple modes, unlike resonant couplers, trimming effective bandwidth by ~15%.​ Operating Frequency Cutoff In a ​​circular waveguide with a diameter of 2.54 cm (1 […]

Evanescent modes feature steep attenuation (e.g., TE₀₁ in rectangular waveguides decays ~0.6dB/μm at 10GHz), trapping >85% energy within 10μm of walls as fields diminish exponentially from surfaces; excited via near-field probes, they never propagate, unlike guided modes. ​Rapid decay with distance​​ A standard silicon optical waveguide operating at a wavelength (λ) of 1550 nanometers, the

Radio waves and microwaves both propagate at 3×10⁸m/s, obey reflection/refraction (e.g., 99% reflect off copper), suffer atmospheric loss (oxygen absorbs 60GHz microwaves like HF radio in ionosphere), and enable comms—Wi-Fi (2.4GHz) or FM (100MHz)—via amplitude/frequency modulation. Same Family, Different Energy They are fundamentally the same type of energy—oscillating electric and magnetic fields—and they both travel

Satellites use high frequencies (e.g., Ku/Ka bands, 12–40GHz) for wider bandwidth (hundreds of MHz vs. tens in L-band), enabling higher data rates; shorter wavelengths allow compact antennas, reducing launch weight while minimizing terrestrial interference. Why High Frequency Matters High-frequency bands, typically classified as those above 3 GHz, such as Ku-band (12–18 GHz) and Ka-band (26.5–40

Yagi antennas are directional, with a driven element, reflector, and directors, offering 10–15dBi gain at 2.4GHz for focused point-to-point links. Omni antennas radiate uniformly horizontally (2–5dBi gain), suited for area coverage; Yagi typically operates 400MHz–6GHz, Omni 30MHz–6GHz, differing in pattern and use case. How They Send and Receive Signals A Yagi antenna, like a flashlight,

Coupler antennas integrate signal routing and isolation functions, enabling power division (e.g., 10–20dB splits) or sampling (insertion loss <0.3dB) between transmit/receive paths while maintaining >25dB isolation at 2–18GHz to minimize interference, optimizing RF system efficiency. Connecting Two Devices Wirelessly A common challenge in RF systems is efficiently transferring a signal from a primary transmitter to