Design of Triplate Line Low Pass Filter

ABSTRACT

Microwave filters form an important building block in the design of low noise parametric amplifiers, harmonic generators and various other microwave circuits. Conventional mode of transmission at microwave frequency is by waveguides and coaxial lines, which have certain disadvantages. The triplate line for transmission of microwave frequencies is a recent advance and offers a number of advantages, such as ease of manufacture and high order of reproducibility.

The paper gives the design aspects of a constant K five-section low pass filter with m derived end sections, designed for specific application in the Land S-bands. The realization of the designed inductive and capacitive elements in triplate line is discussed. The experimental results on a triplate line filter in L-band and one in the S-band are presented with the corresponding theoretical designs.