Abstract
A compact narrowband non-degenerate dual-mode microstrip filter with square shape cuts is presented. The structure is developed by loading the conventional non-degenerate dual-mode resonator by open circuit stubs at two opposite corners. The filter bandwidth is controlled by only decreasing the higher cutoff frequency of the conventional type. With Square shape cuts, return loss is improved. A 20% fractional bandwidth filter is designed and implemented on FR4 material with 4.4 dielectric constant and 1.6 mm thickness at center frequency of 1.5 GHz with passband of 1.3 GHz to 1.6 GHz. Analysis has been achieved using the IE3D simulator. Experimental results do agree with simulations.
Highlights
Now-a-days compact microwave filters are widely used in various wireless communication applications
Dual-mode microstrip resonators have the advantages of low profile, simple fabrication, ease of integration in addition to low cost
Degenerate modes based filters have been investigated in various topologies such as square patch [2], circular patch, triangular patch, square loop [3], circular ring [4] and meander shape [5]
Summary
Now-a-days compact microwave filters are widely used in various wireless communication applications. Dual-mode microstrip resonators have the advantages of low profile, simple fabrication, ease of integration in addition to low cost. Degenerate modes based filters have been investigated in various topologies such as square patch [2], circular patch, triangular patch, square loop [3], circular ring [4] and meander shape [5]. Square and circular patches structures have negligible conductor loss but suffer from higher radiation loss. Square loop and circular ring structures have less radiation loss but suffer from higher conductor loss, especially for thin strip conductors [2]. Degenerate dual mode filters have usually narrow bandwidth of (< %5). Filters with higher bandwidth up to 25% have been investigated using non-degenerate dual-mode structure [6,7]
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