1. Hammerstad E, Jensen O (1981) Accurate models for microstrip computer-aided design. Microw Symp Digest, MTT-S 81 (1):407–409
2. Wheeler HA (1965) Transmission line properties of parallel strips separated by a dielectric sheet. IEEE Trans Microwave Theory Tech, MTT-3 (3):172–185
3. Presser A (1968) RF properties of microstrip lines. MicroWaves 7:53–55
4. Hammerstad EO, Bekkadal F (1975) A microstrip handbook. ELAB Report, STF 44 A74169, N7034. University of Trondheim-NTH, Norway
5. Cohn SB (1955) Problems in strip transmission lines. IRE Trans, PG MTT-3 (2):119–126