How do I design the RF section of a UWB ranging device for precision location applications?

How do I design the RF section of a UWB ranging device for precision location applications? UWB (Ultra-Wideband) uses very short pulses (< 2 ns) over a wide bandwidth (> 500 MHz) to achieve centimeter-level ranging accuracy for indoor positioning, asset tracking, and secure access: (1) UWB spectrum and regulation: frequency: 3.1-10.6 GHz (FCC Part 15.517). Common channels: Channel 5 (6489.6 MHz, 499.2 MHz BW) and Channel 9 (7987.2 MHz, 499.2 MHz BW). Maximum EIRP: -41.3 dBm/MHz (very low power, total approximately 0.5 mW over 500 MHz). UWB coexists with other services without causing interference. (2) RF design of the transceiver: UWB transceiver SoCs: NXP SR150/SR040, Qorvo DW3720/DW3110, Apple U1/U2. The transceiver generates very short pulses at the center frequency. Modulation: BPM-BPSK per IEEE 802.15.4z. Data rate: 850 kbps to 27.24 Mbps. PA: integrated, output power strictly limited by the -41.3 dBm/MHz spectral mask. LNA: wideband (> 500 MHz bandwidth), NF 3-5 dB. (3) Ranging mechanism: Two-Way Ranging (TWR): the initiator sends a ranging frame, the responder replies after a known processing delay. Distance = (round_trip_time - processing_delay) × c / 2. Time resolution: approximately 2 ns for 500 MHz bandwidth, giving approximately 30 cm range resolution. With leading-edge detection and super-resolution algorithms: 5-10 cm accuracy. (4) Antenna design: the antenna must cover > 500 MHz bandwidth at the operating channel. PCB-printed monopole or slot antenna with omnidirectional pattern. Fractal or bow-tie designs achieve the required wide bandwidth. Antenna size: approximately 15-25 mm (smaller than sub-GHz IoT antennas). Multiple antennas for AoA (Angle of Arrival): 3-4 antennas spaced at lambda/2 (approximately 23 mm at 6.5 GHz) for 2D/3D angle estimation. (5) Positioning: TDoA (Time Difference of Arrival): the tag transmits a UWB pulse, multiple anchors at known positions receive at different times. Position is calculated via trilateration: minimum 3 anchors for 2D, 4 for 3D.