Abstract
This article introduces the design of a novel quasi dual-mode, elliptic coaxial filter. The transfer function is mapped to a Generalized Chebyshev prototype with sym- metrically located transmission zeros (TZs) where the cou- pling values are extracted. Furthermore, the miniaturiza- tion is achieved by incorporating stepped-impedance coax- ial line with inductive element shunted at the center to ex- hibit a quasi dual-mode property. Theoretical analysis to- gether with experimental prototype is presented. The center frequency of the filter is 2.7 GHz. The simulated and mea- sured insertion loss/return loss are 1.2 dB / 15 dB and 2.5 dB / 11.5 dB respectively. Both theoretical and measured results show a very good agreement.
Highlights
Microwave filter with compact size, low weight, low loss, and high power handling and selectivity is demanded in cellular communications base-stations
It should be noticed that the source-load coupling is introduced so that the filtering function can form a fraction which enables the generation of the finite-frequency transmission zeros (TZs) at both sides of the passband
The comparative study of the main features of the proposed quasi dual-mode, elliptic coaxial filter with the stateof-the-art is given in Tab. 1
Summary
Microwave filter with compact size, low weight, low loss, and high power handling and selectivity is demanded in cellular communications base-stations. To date the conventional coaxial filter developed could achieve only one resonance per physical structure [5], [6]. This single mode technology based on combline filters are widely employed in base station [7]. Elliptic and pseudo-elliptic filters offer optimal solutions to filtering function with high selectivity and low in-band insertion loss This is achieved by shifting the TZs of an N-degree filter network from infinite frequencies to finite frequencies.
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