Simulation Design of Hairpin Microstrip Bandpass Filter at L-band

Microstrip filters are an integral part of wireless communication systems and their performance affects the stability of the entire system. The common forms of microstrip line filters are parallel-coupled microstrip line filters, hairpin filters and interdigital filters. Hairpin-type filters are the deformed structure of half-wavelength coupled microstrip filters with cross-coupling topology. Hairpin-type microstrip filters have the advantages of small size, simple photolithographic processing, low cost, high accuracy, easy integration and wide operating frequency range. The article combined with electromagnetic simulation software ADS simulation design of a working in the L-band microstrip hairpin filter. The filter has a centre frequency of 1.5 GHz, a bandwidth of 0.4 GHz and an insertion loss of less than 1 dB in the operating band. This paper demonstrates the correctness of the theoretical design and verifies the practical value of the design method through a simulation study of the filter.