Jessada Konpang

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In this paper, a compact diplexer using a square open loop with stepped impedance resonators is proposed to develop the microstrip square open loop resonators bandpass filter. The filter is based upon a square open loop resonator consisting of two identical patches which is attached to the inner corner of the square open loop for size reduction. The compact(More)
This paper proposes a dual-mode wide-band bandpass filter using the microstrip loop resonators with tuning stubs. The filter is based on microstrip loop resonator consists of four identical branches and each branch is a microstrip open-loop element. The introduction of two outer tuning stubs connecting opposite to the ports widens the passband and sharpens(More)
This paper proposes a wide-band bandpass filter using the properties of microstrip open-loop resonators with outer tuning stubs. The microstrip loop resonator consists of four identical branches and each branch is an open-loop microstrip element. An introduced bandpass filter is based on the bandstop filter employing the direct-connected feed lines on the(More)
In this paper, a compact four-poles cross-coupled square open loop resonator diplexer is proposed to develop the microstrip square open loop resonators bandpass filter. The filter is based upon a square open loop resonator consisting of two identical patches which is attached to the inner corner of the square open loop for size reduction. The compact(More)
In this paper, a dual-band filter using stepped-impedance resonators with coupled-feed lines is proposed to develop the microstrip open loop resonators dual-band filter. The dual-band filter is based upon the design of two filters independently; one of them meeting the desired performance at 900 MHz and the other desired performance at 1800 MHz. The two(More)
A novel four-port microstrip diplexer for RF interference rejection is presented in this paper by combining two diplexers together. This technique offers the signal isolation of 62.9 dB between transmitter and receiver module, which is the best figure ever reported. The four-port network exploits microstrip structure for the cost reduction, while still(More)
A four-port diplexer consisting of two back-to-back three-port diplexers combined with a 180° phase shifter in one branch is presented. The technique achieves high Tx/Rx isolation with relatively low degree filters. Two experimental diplexers are demonstrated, one with equal Q resonators in all filters and the other with dissimilar Q factors, enabling(More)
In this paper, a dual-mode wide-band bandpass filter using slotted patch resonator with tuning stubs is introduced as an alternative for the miniaturization of the filter structure. The microstrip loop resonator consists of four identical patches with attached to inner corner of the square loop. The bandpass filter is based on the bandstop filter employing(More)
This paper proposes a compact wide-band bandpass filter using the properties of microstrip open-loop resonators with outer tuning stubs. The microstrip loop resonator consists of four identical branches and each branch is a open-loop microstrip element. An introduced bandpass filter is based on the bandstop filter employing the direct-connected feed lines(More)
In this paper, a dual-band filter using coupled-feed with asymmetrical stepped-impedance resonator is proposed to develop the microstrip open loop resonators dual-band filter. The dual-band filter is based upon the design of two filters independently; one of them meeting the desired performance at 900MHz and the other desired performance at 1800MHz. The two(More)