DESIGN OF A COMPACT LOWPASS-BANDPASS DIPLEXER WITH HIGH ISOLATION
PROGRESS IN ELECTROMAGNETICS RESEARCH LETTERS, vol.97, pp.21-26, 2021 (ESCI, Scopus)
- Publication Type: Article / Article
- Volume: 97
- Publication Date: 2021
- Doi Number: 10.2528/pierl21012701
- Journal Name: PROGRESS IN ELECTROMAGNETICS RESEARCH LETTERS
- Journal Indexes: Emerging Sources Citation Index (ESCI), Scopus, Applied Science & Technology Source, Compendex, INSPEC
- Page Numbers: pp.21-26
- Sivas Cumhuriyet University Affiliated: No
Abstract
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.