Microwave Filters

Microwave filter is a two port network providing signal transmission at passband and signal reflection or signal absorption at stopband. Microwave filters can be lowpass, bandpass, bandstop and highpass. They can also be passive or active. Here, we will focus on passive filters implemented in microstrip technology.
Microwave filters are used in every microwave system (radar, radio astronomy systems, base stations…).
Main characteristics of microwave filters are
- Non-independent magnitude–phase response,
- Signal attenuation because of dielectric presence,
- Relatively difficult full 3D numerical analysis.

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Multihole Waveguide Coupler

Multi-hole waveguide coupler is an extension of a single-hole coupler designed with the intention of increasing the operational bandwidth. The performance is based on size of the coupling holes and distance between them as it is important to achieve wave amplification in the through-direction and cancellation in the opposite direction. Typically, this type of couplers demonstrates frequency selectiveness in its directivity response while its coupling response is less frequency-dependent. Waveguides used correspond to standard X-band WR 90, with dimensions of 22.86 mm by 10.16 mm. Waveguides are coupled through a series of rectangular holes arranged in zig-zag order.

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