Ultra-wideband six-port transmitter and receiver pair 3.1–4.8 GHz

Abstract

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.

Quadrature Phase Shift Keying (QPSK) Modulator Design using Multi-Port Network in Multilayer Microstrip-Slot Technology for Wireless Communication Applications

“…The reported narrowband designs utilizing three couplers and one power divider in [1][2][3][4] consider only single operating frequency of 60, 2.4, 2.5 and 7.5 GHz, accordingly. Meanwhile, there are improved bandwidth performances proposed in [5] and [6] with almost similar operating frequency of 3.1-4.8 GHz and 3-5 GHz, accordingly. Unfortunately, the bandwidth performance is still inadequate.…”

“…Furthermore, this device has an ability to measure two complex signals. This feature can be further applied in the purpose of signal modulation such as a quadrature phase shift keying (QPSK) and 16-quadrature amplitude modulation (16-QAM) as reported in [1][2][3][4][5].…”

“…Unfortunately, the bandwidth performance is still inadequate. Furthermore, the use of branch line couplers in the multi-port network in [2][3][4] and [5] lead to a large size device, which not favorable in the current trend. Whilst, design in [6] is formed by the power divider and quadrature hybrid implemented using one and two substrates, respectively.…”

Four-Octave Six-Port Receiver and Its Calibration for Broadband Communications and Software Defined Radios

“…The six-port receiver is said to be a good solution for the multiband demodulation of high-speed signals, but no many experimental demodulation results proving both assumptions have been published up to now. Some published works are not strictly multi-band [18,24]; other are multi-band but only validate the demodulator for a single frequency [23,26]; and other prove the multi-band behaviour but do not quantify the quality of the demodulated signal [22]. In [21,25] the demodulation performance is quantified over the entire operating frequency range, but with data rates much lower than in our experiments.…”

Miniaturized 0.3-6 GHZ LTCC Six-Port Receiver for Software Defined Radio

“…Some published works are not strictly multi-band [10,18]; other are multi-band, but only validate the demodulator for a single frequency [17,19]; and other prove the multi-band behavior, but do not quantify the quality of the demodulated signal [16]. In [14,15] the demodulation performance is quantified over the entire operating frequency range, but with data rates much lower than in our experiments.…”