Phased array antennas having switched elevation beamwidths and related methods
A phased array antenna includes a first transceiver, a plurality of first radiating elements that are arranged in a first linear array, a first feed network electrically interposed between the first radiating elements and the first transceiver, and a first switch that is coupled along the first feed network, where a state of the first switch is selectable to adjust a number of the first radiating elements that are electrically connected to the first transceiver.
1. A phased array antenna, comprising:
a first transceiver;
a plurality of radiating elements;
a first feed network electrically interposed between the first radiating elements and the first transceiver;
a first switch that is coupled along the first feed network;
wherein a state of the first switch is selectable to adjust a number of the first radiating elements that are electrically connected to the first transceiver,
wherein the first switch is connected to a transmission line segment of the first feed network and is located at an electrical distance of approximately [0.25+(n*0.5)]λ, from a junction where one of the radiating elements connects to the transmission line segment, where n is an integer having a value of 0 or greater and λ, is a wavelength corresponding to a center frequency of the frequency band of operation of the phased array antenna.
2. The phased array antenna of claim 1 , wherein the radiating elements are arranged in a first linear array, and wherein a radiation pattern of the first linear array has a first elevation beamwidth when the first switch is in a first state and has a second elevation beamwidth when the first switch is in a second state, the second elevation beamwidth being different than the first elevation beamwidth.
3. The phased array antenna of claim 1 , further comprising a switch control network that is configured to provide a control signal to the first switch.
4. The phased array antenna of claim 2 , further comprising a second switch that is coupled along the first feed network, wherein the radiation pattern of the first linear array has a third elevation beamwidth when the first switch is in the first state and the second switch is in the first state, the third elevation beamwidth being different than both the first and second elevation beamwidths.
5. The phased array antenna of claim 4 , wherein the first switch is provided along the first linear array between a first pair of adjacent radiating elements, and the second switch is provided along the first linear array between a second pair of adjacent radiating elements that includes at least one radiating element that is not part of the first pair of adjacent radiating elements.
6. The phased array antenna of claim 4 , wherein both the first switch and the second switch are provided along the first linear array between a first pair of adjacent radiating elements.
7. The phased array antenna of claim 6 , wherein the first and second switches are separated by an electrical distance of approximately [0.25+(n*0.5)]λ, where n is an integer having a value of 0 or greater and λ, is a wavelength corresponding to a center frequency of the frequency band of operation of the phased array antenna.
8. The phased array antenna of claim 4 , wherein the first switch and the second switch are independently controllable.
9. The phased array antenna of claim 2 , wherein the first switch is configurable to selectively isolate a subset of the radiating elements in the first linear array from the transceiver.
10. The phased array antenna of claim 2 , further comprising:
a plurality of additional transceivers;
a plurality of additional linear arrays of radiating elements;
a plurality of additional feed networks electrically interposed between the additional linear arrays and respective ones of the additional transceivers;
a plurality of additional switches that are coupled along the respective additional feed networks;
wherein a state of each of the additional switches is selectable to adjust a number of the radiating elements in the respective additional linear arrays that are electrically connected to respective ones of the additional transceivers.
11. The phased array antenna of claim 6 , wherein the first and second switches connect to a transmission line of the feed network at the same electrical distance from the first transceiver.