Dual band full duplex mobile radio

1. A radio comprising:

a transmit portion including a dual band filter;

a receive portion including a dual band filter; and

a circulator connecting the transmit portion and the receive portion and configured to provide transmit and receive switching;

an antenna connected to the circulator, and wherein the transmit portion is connected to a first port of the circulator, the antenna is connected to a second port of the circulator and the receive portion is connected to a third port of the circulator; and

at least one switch connected to the dual band filter of the transmit portion and configured to switch between a half duplex mode of operation and a full duplex mode of operation.

2. A radio in accordance with claim 1 wherein the dual band filter of the receive portion comprises a diplex filter.

3. A radio in accordance with claim 1 wherein the dual band filters are configured to filter signals in each of a 700 MHz and 800 MHz frequency band.

4. A radio in accordance with claim 1 wherein the dual band filter of the transmit portion is configured to pass signals in a 7H and 8L frequency band of a Public Safety Frequency Band and the dual band filter of the receive portion is configured to pass signal in a 7L and 8H frequency band of the Public Safety Frequency Band.

5. A radio in accordance with claim 1 wherein the dual band filter of the transmit portion comprises ceramic dielectric resonater filter.

6. A radio comprising:

a transmit portion including a dual band filter;

a receive portion including a dual band filter; and

a circulator connecting the transmit portion and the receive portion and configured to provide transmit and receive switching, and wherein the transmit portion and receive portion are configured to provide operation in one of a simplex mode, half duplex mode and full duplex mode.

7. A dual band full duplex land mobile radio comprising:

a transmit filter configured to provide bandpass filtering in two frequency bands;

a receive filter configured as a diplex filter to provide filtering in two frequency bands;

a circulator configured to provide switching between a transmit mode and a receive mode; and

at least one switch connected to the transmit filter and configured to switch between a half duplex mode of operation and a full duplex mode of operation.

8. A dual band full duplex land mobile radio in accordance with claim 7 wherein the two frequency bands comprise a 700 MHz and 800 Hz frequency band.

9. A dual band full duplex land mobile radio in accordance with claim 7 wherein the transmit filter is configured to pass signals in a transmit band (i) between about 794 MHz and about 806 MHz and (ii) between about 806 MHz and about 824 MHz, and the receive filter is configured to pass signals in a receive band (i) between about 764 MHz and 776 MHz and (ii) between about 851 MHz and 869 MHz.

10. A dual band full duplex land mobile radio in accordance with claim 7 further comprising an antenna and wherein the transmit filter is connected to a first port of the circulator, the antenna is connected to a second port of the circulator and the receive filter is connected to a third port of the circulator.

11. A dual band full duplex land mobile radio in accordance with claim 7 further comprising a first switch connected to an input of the transmit filter and a second switch connected to the circulator to provide half duplex and full duplex modes of operation.

12. A dual band full duplex land mobile radio in accordance with claim 7 wherein the transmit filter comprises a single filter configured to provide bandpass filtering in the two frequency bands and the receive filter comprises two separate filters to provide filtering in the two frequency bands.

13. A dual band full duplex land mobile radio in accordance with claim 7 wherein the transmit filter is bypassed in the half duplex mode of operation.

14. A dual band full duplex land mobile radio in accordance with claim 7 further comprising a low pass filter operable in the half duplex mode of operation.

15. A method of filtering signals in a radio, the method comprising:

configuring a transmit filter to filter in two different transmit frequency bands;

configuring a receive filter to filter in two different receive frequency bands;

configuring a circulator to switch between a transmit mode and receive mode to provide transmitting and receiving in the two different transmit and receive frequency bands using the transmit and receive filters; and

configuring a switch to switch between a half duplex and full duplex mode of operation.

16. A method in accordance with claim 15 wherein one of each of the transmit and frequency bands are in the 700 MHz and 800 MHz frequency bands.