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 (1504, 1508) 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 (1504, 1508) 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.