RF module and antenna systems
Architectures and implementations of a transceiver system for wireless communications are presented, the system including one or more antennas supporting a single frequency band or multiple frequency bands, a transmit circuit, a receive circuit, and an isolation circuit that is coupled to the one or more antennas and the transmit and receive circuits and provides adequate isolation between the transmit circuit and the receive circuit.
1. An antenna device, comprising:
a first metamaterial antenna structure comprising a first cell patch configured to receive and transmit signals in a specified first frequency band;
a second metamaterial antenna structure comprising a second cell patch configured to receive and transmit signals in specified second and specified third frequency bands, the second metamaterial antenna structure configured to couple to the first metamaterial antenna structure using the second frequency band;
a first port coupled to the first metamaterial antenna structure, the first port configured to operate in the specified first frequency band;
a second port coupled to the second metamaterial antenna structure, the second port configured operate in the specified second and third frequency bands; and
a control network with a first input impedance and a second input impedance, coupled between the second metamaterial antenna structure and the second port, wherein (1) the second input impedance is high at the second frequency band and the second input impedance and the first input impedance match the second antenna to the second port at the third frequency band, and (2) the first frequency band and the second frequency band reside in similar frequency ranges such that they interact, and (3) the third frequency band is separated from the first frequency band and the second frequency band;
wherein the coupling established between the first metamaterial antenna structure and the second metamaterial antenna structure, and the high input impedance, operate to expand the first frequency band of the first metamaterial antenna structure.
2. The antenna device of claim 1 wherein the first metamaterial antenna structure is a narrow band radiator and the second metamaterial antenna structure is a multiband radiator.
3. The antenna device of claim 1 wherein the second metamaterial antenna structure is strongly coupled to the first metamaterial antenna structure.
4. The antenna device of claim 1 wherein the first frequency band originates at the first port and the second frequency band and the third frequency band originate at the second port.
5. The antenna device of claim 1 wherein the first frequency band and the second frequency band are next to each other.
6. The antenna device of claim 1 wherein the third frequency hand resides in a lower frequency band than the first frequency band.
7. The antenna device of claim 1 wherein the third frequency band resides in a lower frequency band than the second frequency band.
8. The Antenna device of claim 1 wherein the control network is configured to control the second input impedance at the second frequency band to expand the frequency band of the first metamaterial antenna structure.
9. The antenna device of claim 1 wherein the first input impedance is configured to match the impedance of the second port and the second input impedance is configured to match the input impedance of the second metamaterial antenna structure, in the third frequency band.
10. The antenna device of claim 1 wherein the second frequency band of the second metamaterial antenna structure interacts with the first frequency band of the first metamaterial antenna structure to expand the bandwidth of the first metamaterial antenna structure.
11. The antenna device of claim 1 wherein the second metamaterial antenna structure acts as a parasitic radiator to the first metamaterial antenna structure while the second metamaterial antenna structure is operating at the second frequency band, wherein the first frequency band and the second frequency band can be excited by the first metamaterial antenna structure.