Abstract: A tracking system comprising: a radio frequency (RF) signal circulator; an iridium modem coupled to first port of the circulator; an antenna coupled to second port of the circulator, wherein the circulator passes a signal transmitted by the modem to the antenna when the switch is switched to a first mode; a low noise amplifier (LNA) coupled to third port of the circulator, wherein the circulator passes RF signals received from the antenna to the LNA; a diplexer coupled to an output of the LNA; a GNSS receiver coupled to a first output of the diplexer through a GNSS filter; an iridium filter coupled to a second output of the diplexer; wherein the switch couples the iridium filter to the modem when the iridium modem is in a receiving mode, and wherein the switch couples the modem to the first port when the modem is in a transmitting mode.

Abstract: A tracking system comprising: a radio frequency (RF) signal circulator; an iridium modem coupled to first port of the circulator; an antenna coupled to second port of the circulator, wherein the circulator passes a signal transmitted by the modem to the antenna when the switch is switched to a first mode; a low noise amplifier (LNA) coupled to third port of the circulator, wherein the circulator passes RF signals received from the antenna to the LNA; a diplexer coupled to an output of the LNA; a GNSS receiver coupled to a first output of the diplexer through a GNSS filter; an iridium filter coupled to a second output of the diplexer; wherein the switch couples the iridium filter to the modem when the iridium modem is in a receiving mode, and wherein the switch couples the modem to the first port when the modem is in a transmitting mode.

Abstract: A hybrid diplexer-circulator system including a circulator and a modified-diplexer is provided. The circulator includes a first circulator-port, a second circulator-port coupled to a first chain comprising a receiver module, and a third circulator-port coupled to a second chain comprising a satellite modem. The first chain receives first-frequency signals and reflects second-frequency signals. The second chain receives the second-frequency signals reflected from the first chain and transmits third-frequency signals. The modified-diplexer includes: a first diplexer-port of the modified-diplexer, which is shared as the first circulator-port; a second diplexer-port; and third diplexer-port in the second chain. The second diplexer port inputs the first-frequency signals from a filter in the first chain.

Abstract: A hybrid diplexer-circulator system including a circulator and a modified-diplexer is provided. The circulator includes a first circulator-port, a second circulator-port coupled to a first chain comprising a receiver module, and a third circulator-port coupled to a second chain comprising a satellite modem. The first chain receives first-frequency signals and reflects second-frequency signals. The second chain receives the second-frequency signals reflected from the first chain and transmits third-frequency signals. The modified-diplexer includes: a first diplexer-port of the modified-diplexer, which is shared as the first circulator-port; a second diplexer-port; and third diplexer-port in the second chain. The second diplexer port inputs the first-frequency signals from a filter in the first chain.