An antenna system comprising:- a first antenna supporting a first frequency range and a second antenna supporting a second frequency range, wherein the first frequency range includes a first band and wherein the second frequency range includes a second band, wherein the first band and the second band are separated by a bandgap; a first circuit having a power amplifier configured to process a first RF signal in the first band to transmit the first RF signal from the first antenna; a second circuit comprising a low noise amplifier configured to process a second RF signal in the second band, the second RF signal being received at the second antenna; and an isolation circuit that is coupled to the first and second antennas to provide electromagnetic isolation between the first circuit and the second circuit, the isolation circuit comprising:- a low pass filter coupled to the power amplifier ; a band pass filter coupled to the low noise amplifier ; and a notch filter coupled to the band pass filter and the second antenna and configured to have a dip in insertion loss in the first band; wherein the antenna system comprises a substrate structure supporting one or more metallization layers of the antenna system; wherein the first antenna is formed at a first end of the substrate structure ; wherein the second antenna is formed at a second end of the substrate structure ; and wherein the notch filter is formed in one of the one or more metallization layers and is coupled to the second antenna through a Coplanar Waveguide CPW feed of the antenna system. a first antenna supporting a first frequency range and a second antenna supporting a second frequency range, wherein the first frequency range includes a first band and wherein the second frequency range includes a second band, wherein the first band and the second band are separated by a bandgap; a first circuit having a power amplifier configured to process a first RF signal in the first band to transmit the first RF signal from the first antenna; a second circuit comprising a low noise amplifier configured to process a second RF signal in the second band, the second RF signal being received at the second antenna; and an isolation circuit that is coupled to the first and second antennas to provide electromagnetic isolation between the first circuit and the second circuit, the isolation circuit comprising:- a low pass filter coupled to the power amplifier ; a band pass filter coupled to the low noise amplifier ; and a notch filter coupled to the band pass filter and the second antenna and configured to have a dip in insertion loss in the first band; a low pass filter coupled to the power amplifier ; a band pass filter coupled to the low noise amplifier ; and a notch filter coupled to the band pass filter and the second antenna and configured to have a dip in insertion loss in the first band; wherein the antenna system comprises a substrate structure supporting one or more metallization layers of the antenna system; wherein the first antenna is formed at a first end of the substrate structure ; wherein the second antenna is formed at a second end of the substrate structure ; and wherein the notch filter is formed in one of the one or more metallization layers and is coupled to the second antenna through a Coplanar Waveguide CPW feed of the antenna system. <EOS>