1. A method for identifying performance bounds of a transmit-receive (T/R) module over a bandwidth ƒ b : providing an antenna, a transmitter, and a receiver all with known reflectance within the bandwidth ƒ b ; connecting the transmitter, the antenna, and the receiver to the T/R module without a matching circuit and measuring the following over the bandwidth ƒ b : the isolation between the transmitter and the receiver, the insertion loss from the transmitter to the antenna, and the insertion loss from the antenna to the receiver; plotting the minimum measured isolation and the maximum measured insertion loss on a performance image graph as a raw T/R module point; mathematically representing a multiport matching circuit configured to be connected to the T/R module, the antenna, the transmitter, and the receiver, wherein the matching circuit contains no gyrators and comprises a fixed number of capacitors and inductors; using the mathematical representation of the matching circuit to approximate a Pareto front comprised of a plurality of Pareto points; connecting each Pareto point to the raw T/R module point on the performance image graph such that the performance image becomes a visual representation of the performance bounds of a class of multiport matching circuits having N C capacitors and N L inductors; identifying from the performance image a best possible insertion loss and isolation that could be obtained by connecting the transmitter, the antenna, and the receiver to the T/R module with any matching circuit from the class of multiport matching circuits; designing an optimized matching circuit based on an overall tradeoff between the best possible insertion loss and isolation from the class of multiport matching circuits to meet predefined performance criteria; and connecting the T/R module, the antenna, the transmitter, and the receiver to the optimized matching circuit.