Design and implementation of a practical semi-lumped high power low-pass filter

Abstract

In this article, a compact, semi-lumped and high power low-pass filter in VHF band frequency is designed, fabricated, and measured. A semi-lumped structure is used to decrease the size of the filter and improve its power handling. In high power analysis, all effects of critical points in distributed and lumped structures are considered. The experimental measurements show close agreement with the simulation results. This filter has a cut off frequency at 180 MHz, 0.02 dB ripples in pass band, return loss better than 21 dB in the pass band, 0.2 dB insertion losses, 1.6 dB/MHz shape factor, a 75% miniaturization against conventional structures with distributed elements, and wide out of band rejection. Moreover, 10 and 1 KW are the peak power and the average power handling of the filter. V C 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:605-614, 2014.

A C-band folded planar low-pass filter utilizing U-shaped probe for high power TR module

“…This planar low-pass filter is generally realized in PCB or alumina substrate, with the power handling capability of lower than 10 Watt, which is limited by the breakdown voltage of the capacitor, and the maximum operating current of the inductor. To address the power handling issue, the low-pass filter is often realized in waveguide [4][5] or coaxial line [6][7]. These methods can achieve low insertion loss and high power capability, but large size and complexity in assembly limit their applications in the planar circuits or the integration in micro-systems.…”

Thermal analysis, design, and implementation of an L‐band high‐power stepped impedance low‐pass filter

“…[1][2][3] In previous works, [4][5][6][7] new techniques are proposed for the design of a compact high-power low-pass filter (LPF), which decrease the filter length compared to the previous alternative techniques. Also, in the previous work, the authors have presented another type of high-power filter 8 in VHF band frequency, which the primary goal was determining the peak power handling capacity inside the filter. Accordingly, in the high-power operation, increasing power dissipation and thermal are essential problems in any high-power radio frequency or microwave systems because of the declining performance of microwave devices and circuits.…”