DESIGN OF A COMPACT LOWPASS-BANDPASS DIPLEXER WITH HIGH ISOLATION

GÖRÜR A. K., ELDEN S.

PROGRESS IN ELECTROMAGNETICS RESEARCH LETTERS, cilt.97, ss.21-26, 2021 (ESCI) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 97
  • Basım Tarihi: 2021
  • Doi Numarası: 10.2528/pierl21012701
  • Dergi Adı: PROGRESS IN ELECTROMAGNETICS RESEARCH LETTERS
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus, Applied Science & Technology Source, Compendex, INSPEC
  • Sayfa Sayıları: ss.21-26
  • Sivas Cumhuriyet Üniversitesi Adresli: Hayır

Özet

In this paper, a novel compact lowpass-bandpass microstrip diplexer with high isolation is proposed. The proposed structure consists of a lowpass filter section and a bandpass filter section. The lowpass filter section is designed at a cut-off frequency of 2 GHz with sixth order elliptic filtering characteristics. The bandpass filter section is designed at 3.5 GHz by using a meandered dual-mode loop resonator (MDMLR). The MDMLR is coupled to input port by open circuited feeding lines. The lowpass-bandpass diplexer is formed by combining lowpass and bandpass filter sections without using an additional matching circuit. The designed lowpass-bandpass diplexer has been fabricated and measured in a very good agreement with the simulated results. Isolation between the output ports has been measured as better than 40 dB.