Abstract
In this paper, highly selective dual-mode microstrip bandpass filters are proposed using horizontal and vertical slots formed on the surface of a triangular patch. Slots are responsible for splitting and coupling of dual degenerate modes and also facilitate in controlling their resonant frequencies by varying the dimensions of the slots. Horizontal and vertical slots reroute the direction of the flow of current on the surface of the patch, which results in switching of transmission zeros. Two 2-pole and one 4-pole dual-mode filters are designed, simulated and fabricated. Two pole filters have transmission zeros on side of the passband and four pole filter have transmission zeros on both sides of the passband. The designed filters exhibit a fractional bandwidth of less than 7 % and there is a good agreement between simulated and measured results.
Highlights
Microstrip filters with asymmetric frequency response on either side of the passband are needed in modern mobile and wireless communication systems
We can notice that the direction of the current flowing on the surface of the patch is reversed, when we change from horizontal to vertical slot
The length and position of both horizontal and vertical slots is optimized by using full wave EM simulator
Summary
Microstrip filters with asymmetric frequency response on either side of the passband are needed in modern mobile and wireless communication systems These filters have better selectivity, sensitivity and thereby improve the efficiency of the spectrum utilization. Microstrip square open loop resonators [2] are used to introduce either positive or negative cross coupling This causes finite attenuation pole to appear either in lower or upper side of the passband. In [3] closed square loop resonator with varied perturbation is used to achieve asymmetric frequency response utilizing dual degenerate modes. Two-pole and four-pole filters are designed using microstrip triangular patch employing horizontal and vertical slots These slots are used to excite dual degenerate modes and to control the position of transmission zeros on either side of the pass band.
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