A communication device, comprising: - an ultra-wideband, UWB, communication unit configured to enable UWB communication with at least one external communication device, the UWB communication unit comprising a first receiver and a second receiver; - a controller configured to control the UWB communication unit; wherein the controller is configured to cause the UWB communication unit to operate in a first mode in which the first receiver is alternately coupled to an external first antenna and an external second antenna; and wherein the controller is configured to cause the UWB communication unit to operate in a second mode in which the first receiver is coupled to the first antenna and the second receiver is coupled to the second antenna; wherein the first receiver is coupled to the first antenna through a first path, the second receiver is coupled to the second antenna through a second path, and the first receiver is coupled to the second antenna through a third path; characterized in that each of the first, second and third path comprises a matching network and a controllable switch for switching the respective path to ground; wherein the controller is configured to cause the UWB communication unit to operate in the first mode by deactivating the second receiver and by alternately switching the first path and the third path to ground, wherein the first path and third path are switched to ground by closing the controllable switch of the respective paths; wherein the second receiver is deactivated upon or after switching the second path to ground, wherein the second path is switched to ground by closing the controllable switch of said second path; wherein the controller is configured to cause the UWB communication unit to operate in the second mode by switching the third path to ground, wherein the third path is switched to ground by closing the controllable switch of said third path. - an ultra-wideband, UWB, communication unit configured to enable UWB communication with at least one external communication device, the UWB communication unit comprising a first receiver and a second receiver; - a controller configured to control the UWB communication unit; wherein the controller is configured to cause the UWB communication unit to operate in a first mode in which the first receiver is alternately coupled to an external first antenna and an external second antenna; and wherein the controller is configured to cause the UWB communication unit to operate in a second mode in which the first receiver is coupled to the first antenna and the second receiver is coupled to the second antenna; wherein the first receiver is coupled to the first antenna through a first path, the second receiver is coupled to the second antenna through a second path, and the first receiver is coupled to the second antenna through a third path; characterized in that each of the first, second and third path comprises a matching network and a controllable switch for switching the respective path to ground; wherein the controller is configured to cause the UWB communication unit to operate in the first mode by deactivating the second receiver and by alternately switching the first path and the third path to ground, wherein the first path and third path are switched to ground by closing the controllable switch of the respective paths; wherein the second receiver is deactivated upon or after switching the second path to ground, wherein the second path is switched to ground by closing the controllable switch of said second path; wherein the controller is configured to cause the UWB communication unit to operate in the second mode by switching the third path to ground, wherein the third path is switched to ground by closing the controllable switch of said third path.