Design of a dual‐band waveguide filter based on micromachining fabrication process

Abstract

In this study, a dual‐band waveguide filter based on micromachining fabrication process in terahertz is proposed. The proposed filter employs a pair of four‐stage rectangular waveguide resonators based on the parallel structure and the centre frequencies of the two passbands are designed at 240 and 300 GHz with the relative bandwidths of 4.2 and 3.3%. The isolation between the two passbands has been achieved over 40 dB. The simulated and measured results are in good agreement and the proposed filter can be applied in the millimetre wave communication systems.

W‐band dual‐band waveguide band‐pass filter using dual‐mode cavities

“…Introduction: As the millimetre-wave wireless communication systems used for imaging radar, remote sensor and radio-astronomy have been developed rapidly, the interest in the essential W-band filters has been increased [1][2][3][4][5][6][7][8]. With the merits of low-loss, high-power handling and easy interconnection, rectangular waveguides are still the principal medium at such high-frequency band.…”

“…However, to the best of the authors' knowledge, there are few waveguide DBBPFs that have been developed at the millimetre-wave or terahertz (THz) band so far. Two WR-3-band (220-330 GHz) waveguide DBBPFs have been reported based on the methods of splitting a wide passband into two adjacent sub-bands and connecting two independent single-band BPFs parallelly [6,7]. Nevertheless, both DBBPFs are designed by traditional architectures, which cannot control the frequency response and fractional bandwidth (FBW) ratios flexibly.…”

Design of dual‐mode dual‐band rectangular waveguide filtering antenna

“…Employing the synthesis procedure given in Reference , then using Equation , and design parameters of filtering network are given as: k i,i + 1 = [0.0194; 0.0146; 0.0194]; k i,i′ = 0.0171; Q es = 41.5. As can be seen, the filter is symmetrical and coupling coefficients in Figure are identical.…”

“…Waveguide has advantages of high power‐handling capacity, high reliability, and stable performance. In References , a dual‐band bandpass filter is designed by paralleling two individual single passband filters. In Reference , a dual‐band filtering antenna is proposed based on substrate integrated waveguide (SIW) technology.…”

Research on the Defected Ground Structure With Von Koch Snowflake Fractals

“…Filters are often used in these systems to extract useful signals, suppress unwanted interferences and reduce system noise [1]- [4]. Therefore, it is very important to improve out-of-band rejection of the planar filters achieve excellent system performance in modern communication circuits [5]- [9].…”