Abstract-A fully integrated triplexer for multi-band ultrawideband radio is presented. The triplexer utilizes a microstrip network and three combined broadside-and edge-coupled filters. It is fully integrated in a printed circuit board with low requirements on the printed circuit board process tolerance. Three flat sub-bands in the frequency band 3.1-4.8 GHz have been achieved. The group delay variation within each 500 MHz sub-band was measured to be around 1 ns. A good agreement between simulation and measurement was obtained.
This paper presents an ultra-wideband transmitter and receiver pair covering the frequency band of 3.1-4.8 GHz, based on the six-port technique. This six-port circuit utilizes three ultra-wideband 3-dB 90º branch couplers and one 3-dB 0º Wilkinson power divider. It is manufactured utilizing microstrips on a printed circuit board. The measurement shows that the transmitter and receiver are able to demodulate and modulate QPSK signals in the frequency range 3.1 to 4.8 GHz.
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