Design of K-band modified hairpin filter with harmonic suppression using GaAs MMIC process

Abstract

Purpose

The purpose of this paper is to present a K-band modified hairpin bandpass filter on a planar circuit with harmonic suppression and compact size.

Design/methodology/approach

The inter-connect transmission lines of conventional hairpin filter are replayed by T-shaped open stub to achieve transmission zero for second harmonic. This filter is simulated and optimized by using electromagnetic simulation software and tested on-chip.

Findings

This proposed filter shows the return loss of better than −10dB, the insertion loss of better than 2 dB in pass-band and suppression of more than 40 dB at second harmonic.

Originality/value

The proposed filter can be designed on monolithic microwave integrated circuit, PCB or LTCC and it is useable for microwave and microwave and millimeter-wave systems.

Citation

Guan, J., Gong, M., Gao, B., Lu, Y. and Lu, Y. (2019), "Design of K-band modified hairpin filter with harmonic suppression using GaAs MMIC process", Circuit World, Vol. 45 No. 4, pp. 287-291. https://doi.org/10.1108/CW-01-2019-0006